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🚀 Curated list of x402 resources: HTTP 402 Payment Required protocol for blockchain payments, crypto micropayments, AI
⚡ The Ultimate x402 Resource Hub - Everythng you need to build internet-native payments using HTTP 402. Perfect for AI agents, APIs, and micropayments. Build paywalls, monetize services, and enable autonomous agent payments with crypto/USDC. Zero fees, 2-second settlement.
The x402 protocol enables instant Blockchain payments over HTTP using the 402 "Payment Required" status code. This is your complete guide to mastering x402 and building the future of agent payments.
🚀 Start building in 5 minutes | ⚡ 2-second settlement | 💰 USDC on Base
New to x402? Follow this path to mastery:
For AI Agents: Start with MCP Integration to enable Claude/other agents to make autonomous payments.
Core resources from the x402 protocol maintainers.
Essential documentation for understanding and implementing x402.
Get started with x402 in minutes.
Official and community implementations of the x402 protocol.
x402-typescript ⭐ Official - Complete TypeScript implementation.
x402-data-api - HTTP 402 micro-payment data API with Base chain USDC payments. 16 developer data tools including email validation, DNS lookup, WHOIS, SSL check, and IP geolocation with x402 payment integration.
x402-express - Express.js middleware example.
hive-rosetta ⭐ Community - Open EIP-3009 transferWithAuthorization signer. Zero ethers/web3 dependency, primitives-only EIP-712. Returns wire shape {scheme: 'exact', network: 'eip155:8453', payload: {authorization, signature}}. Same package name on PyPI. (GitHub)
x402 ⭐ Official - Python SDK on PyPI.
ag402 ⭐ Community - Payment layer for AI agents using x402. Wrap any API or MCP server with a USDC paywall (ag402 serve), or let agents auto-pay (ag402 run). Solana USDC, ~0.5s settlement, non-custodial, 648+ tests. Glama
x402-pay - Call any x402 API with one API key. Routes requests through a broker that handles on-chain payment. httpx-based, optional wallet mode for direct payments. (GitHub)
hive-rosetta ⭐ Community - Direct port of the Node hive-rosetta signer. Byte-identical EIP-712 digest across both languages. Returns {scheme, network, payload} matching CDP /verify and /settle. (GitHub)
Real companies using x402 in production with proven scale and transaction volumes.
quantum-shield ($0.10, ML-KEM-768 PQC tunnel — NIST FIPS 203), kya ($0.01, agent trust scoring), browser-rendering ($0.03, headless browser extraction), memory ($0.05, semantic recall on a PQC knowledge index), workers-ai ($0.02, Llama 3.1 inference). All settlement routed through Coinbase CDP facilitator for Bazaar indexing. (Agent Card | Bazaar Manifest | MCP | Sitemap)Key Performance Indicators:
| Chain | Status | Facilitators | Settlement | Production Examples |
|---|---|---|---|---|
| Base | Production | Coinbase CDP, Cloudflare | Instant (2s) | AIsa, Bitget, thirdweb |
| Base Sepolia | Testnet | Coinbase CDP | Instant (2s) | Development, Testing |
| Ethereum | Production | Cloudflare | Deferred | Enterprise DApps |
| Solana | Production | Community | Instant (<1s) | High-frequency trading |
| BNB Chain | Production | Pieverse | Instant (2s) | Gaming, NFTs |
| Radius | Production | Community | Instant (<1s) | Micropayments |
Pyrimid - Agent commerce protocol for x402-style USDC payments on Base. Includes on-chain vendor/product registry, payment router, affiliate attribution, MCP endpoint, and live catalog API for agent-discoverable paid services. Current mainnet proof: 3 vendors, 8 on-chain products, 4 routed test payments. (Catalog) (MCP) (Skill)
Polybot Arb Intelligence — Real-time cross-platform prediction market arb data (Polymarket+Kalshi+Myriad). x402 USDC on Base. Live API
Aigregator - Structured data on 5,336+ AI tools via REST API and MCP server. Search, compare, and retrieve tool profiles. USDC micropayments on Base. (MCP Server)
Xquik - Real-time X (Twitter) data API with 7 MPP/x402 pay-per-use endpoints — tweet lookup, tweet search, user lookup, follower check, article extraction, media download, and trends. No accounts or subscriptions required. (GitHub) (npm) (MCP Server)
agentsvc.io - 20 utility tools for AI agents via x402 USDC micropayments on Base. Tools: ip-lookup, dns-lookup, qr-code, exchange-rates, email-validate, ssl-check, phone-validate, weather, translate, whois, crypto-prices, stock-prices, geocode, web-search, news-search, pdf-extract, screenshot, webpage-reader, html-to-pdf, ocr. $0.001–$0.008 USDC per call. No API keys, no signup. Auto-discovery: /.well-known/agent-services.json | Catalog | OpenAPI | MCP Server | (GitHub)
AgentData API - Real-time crypto market data for AI agents. 16 pay-per-request endpoints on Base Mainnet: prices, funding rates, volatility, liquidation levels, DeFi yields, cross-exchange arbitrage, technical indicators (RSI/MACD/BB/ATR), support/resistance, sentiment, stablecoin health, and historical OHLCV. Self-hosted facilitator, no accounts required. Supports x402 v2 with Bazaar discovery extension. (Discovery) (OpenAPI)
Fly Labs Agentic Market - YouTube data APIs for AI agents, paid in USDC on Base. Two endpoints live: POST /api/agents/transcribe ($0.03) returns a stable v1.0 JSON payload with verbatim transcript, language, time-indexed paragraphs, creator chapters, and canonical metadata (captions when available, Whisper fallback otherwise, no LLM rewrites). POST /api/agents/engagement ($0.02) returns view/like/comment counts, derived ratios, a composite engagement score, channel info (subscribers included), and full video context (tags, categories, thumbnail, availability, live status). Transparent cache on every response (cache.hit, cachedAt, ageSec) — transcripts are permanent, engagement refreshes every 6 hours. Typed error codes, OpenAPI 3.1, no signup. (OpenAPI 3.1) (Manifest)
NicheData KDP Intelligence - Niche demand and competition intelligence for Kindle Direct Publishing authors. AI agents query keyword-level data including demand scores, competition intensity, BSR ranges, revenue estimates, and pricing analytics. $0.03 USDC per query on Base via CDP Facilitator. Free discovery endpoint lists all available niches. (OpenAPI) (Docs)
DevDrops - 22 pay-per-query data APIs for AI agents — prediction markets (Polymarket + Manifold), property intelligence, sports odds, regulatory filings, FX rates, weather, IP geolocation, academic papers, document summarisation (Claude), and more. $0.001–$0.10 USDC per query on Base. No API keys or subscriptions. (OpenAPI) (Catalog)
Social Intel — Instagram influencer search API for AI agents. Search by niche, country, demographics, or follower count → returns usernames, bios, follower counts, business categories, and public business emails. Single-profile lookup at $0.01; full search $0.50–$1.30 (100 leads). USDC on Base, Solana, Polygon, Arbitrum. No signup. (OpenAPI) (MCP Server) (Demo)
GlobalAPI - Compliance and macro-economics API hub for AI agents across 43 endpoints. Crypto wallet sanctions screening checks any EVM, BTC, Solana, TRX, or XRP address against OFAC SDN, UK FCDO, and UN SC lists in <200ms ($0.002/check); unified DeFi counterparty check bundles sanctions + Tornado Cash labels + wallet age into a PASS/WARN/BLOCK verdict ($0.01). Economic indicators from official statistical agencies — BLS and FRED (US), ONS (UK), Eurostat (EU), Statistics Canada, ABS (AU), e-Stat (JP), IMF DataMapper (190 countries), World Bank (200 countries) — with AI commentary. Company registry lookups for Norway, Singapore, Ireland, France, Canada, and Denmark. No API key — x402 USDC on Base mainnet, $0.002–$0.10/call. (OpenAPI | Discovery)
TOUGH LOVE SECURITY ImageGen - Pay-per-image AI generation powered by Cloudflare Workers AI (Stable Diffusion XL Lightning + Flux-1-Schnell). Three tiers: $0.50 single, $1.99 12-pack, $7.99 100-bundle. Stripe Checkout for humans, x402 for agents at $0.04/image. No accounts, no expiring credits. (Launch post)
TOUGH LOVE SECURITY ClawWork - Instant AI labor marketplace with three tiers: $5 quick polish (90s turnaround), $25 deep brief (1.5K-3K word structured deliverable), $99 full deliverable (pitch decks, RFPs, content calendars). Stripe + x402 ($0.05/call on bulk). Powered by Claude 4.7 Sonnet. (Launch post)
TOUGH LOVE SECURITY Contract Risk Score - Smart contract risk scoring API for DeFi devs. Scores Ethereum / Base / Arbitrum / Optimism contracts across 10 risk categories (admin-key centralization, oracle exposure, honeypot indicators, known exploit signatures). $1.25 per 5-pack via Stripe, $0.25/call via x402. Triage layer between "free Etherscan glance" and "$50K formal audit." (Launch post)
Deepnets - Solana token intelligence: safety analysis, deep wallet-funding-network mapping, holder breakdowns, social/Twitter research, trending feed, streamflow/staking lockup data. 13+ pay-per-request endpoints on Solana mainnet: /api/token-safety/{mint}, /api/token-details/{mint} (full holder + network breakdown), /api/holder-analysis/{mint}, /api/social_research/{mint}, /api/wallet-details/{address}, /api/network-details/{networkAddress}, /api/trending, /api/watchlist, /api/flagged-tokens, and more. $0.01 basic / $0.15 holder analysis. USDC on Solana, gas sponsored by the facilitator — no SOL needed. v2 with Bazaar discovery extension. (OpenAPI) (Docs) (Marketing)
OpenPulsechain - PulseChain blockchain analytics API with 28 x402-paid endpoints: token safety scores (0-100), opportunity signals, whale alerts, pair analytics (price impact, volatility), deployer reputation, AML funding tree, smart money feed, gas price, OHLCV history. Covers 5,900+ tokens. $0.001–$0.03 USDC per call on Base. (x402 Discovery) (npm MCP) (GitHub)
DataFood (TOUGH LOVE SECURITY) - Universal data hub for AI agents — 17 cross-niche sources (crypto prices, ETH gas, weather, news, HN, GitHub trending, DeFi yield, token risk via GoPlus, HHS healthcare-breach feed, geocoding, more) behind one POST /api/data/bundle call. Bundle micropayments save up to 92% vs per-API alternatives. Day pass $0.99 unlimited 24h, week pass $4.99. Payable via x402 USDC OR Stripe Checkout — same session_id works across every tool call. Free 1-row preview at /api/data/preview?type=…&q=…. (Live demo) (MCP server) (x402 descriptor) (catalog)
Askew - Security and DeFi intelligence for AI agents. 5 pay-per-call endpoints on Base mainnet: /yields ($0.002, live APY across 5 chains via DefiLlama), /staking/router ($0.003, SOL/ATOM native vs liquid staking routing), /research/query ($0.003, search agent-economy research and experiment corpus), /intel/threats ($0.002, Guardian security threat summary), /intel/feed ($0.005, combined research + threats + staking strategic feed). Free preview at /yields/preview and /health. Self-hosted facilitator (xpay.sh). Auto-discovery: (/.well-known/x402.json | llms.txt | /offers)
BitBooth - 6 utility, content, and security endpoints for AI agents on Base mainnet, settling via Coinbase CDP Facilitator. Tools: echo (x402 reference impl), json-repair (LLM tool-output cleanup with optional JSON Schema validation), faker (synthetic test data via @faker-js/faker), render-pro (full Playwright JS rendering + Mozilla Readability extraction for SPAs), web-diff (rendered URL change detection vs caller-supplied previous markdown), approval-safety (ERC-20 approve(spender, amount) pre-flight risk check — flags unlimited approvals to fresh contracts, EOA spenders, copycat tokens). $0.001 USDC per call for utility tier, $0.05 for premium tier. No API keys, no subscriptions. Self-hosted discovery at bazaar.json. (GitHub)
EconDash - Global macroeconomic data API for AI agents: 753 indicators across 298 countries (World Bank, FRED, OECD). 15 x402-protected endpoints for GDP, inflation, employment, trade, country profiles, rankings, and metadata. $0.02 USDC/call on Base. Also supports MPP (Tempo + Solana). (Docs) (OpenAPI)
/preview, /opportunity) so agents can compute ROI before paying — no x402 wallet needed to evaluate. Speaks x402, MCP, and A2A simultaneously. (OpenAPI) (Agent Card) (MCP Server) (Game Info)Major tech companies leveraging x402 in production include Coinbase (Native CDP integration, primary facilitator), Cloudflare (Edge payment processing infrastructure), Google (Agent-to-Agent A2A payment protocol development), Visa (Enterprise payment rail exploration), and thirdweb (AI agent transaction framework Nebula).
Client libraries for making x402 payments.
HTTP Clients
ethers peer dep for signing.AI Agent SDKs
fetch402), ERC-4337 smart accounts, on-chain reputation feedback after every x402 call, and ERC-8004 service discovery. USDC on Base. (npm)Wallet Integration
Server-side integrations for accepting x402 payments.
Multi-Framework
endpoints/, the loader registers it as a paid HTTP endpoint in ~400ms via fs.watch (no restart, no manifest edits). Generates Bazaar-shape 402 challenge with EIP-712 extras, /.well-known/x402.json manifest, agent-card, and OpenAPI spec automatically. Zero runtime dependencies. Production-extracted from api.autonomagic.org's 22 paid endpoints. (npm) (GitHub)Express / Hono
app.use(requireScore({ minScore: 60 })). Extracts paying wallet from X-Payment header, looks up MolTrust trust score, blocks agents below threshold with 403 + registration link. Zero dependencies. (npm) (GitHub)preflight(handler, { minScore: 40 }). Gates by a 5-dimension trust score (wallet age, tx history, counterparties, funding source, ERC-8004), returns Ed25519-signed receipts verifiable with only the public key, supports block / warn / surcharge modes. Hono / Express / Next adapters. (npm) (GitHub)Next.js
Hono
FastAPI
Client Libraries
pip install x402-payment-harness. (PyPI)Axum
Payment verification and settlement services.
Hosted Facilitators:
reference pubkey binding (cryptographic tx↔order correlation without memos). Also implements MPP and AP2 at the same URL. Open-source MCP adapter./__x402/health.@x402/svm/exact/facilitator, fee_payer abstraction so payers only need USDC, persistent keypair via env var (Heroku/Fly-friendly). Hosted devnet endpoint: https://agentpay-facilitator-e9b20a5fee6a.herokuapp.com.Full working examples and templates.
getAmount callback. Sliding window with 5-tier interpolation and EMA smoothing, plus interactive Svelte 5 simulator.Daizyx402 Security Research API - AI-powered smart contract security analysis and DeFi vulnerability research by autonomous agent. $0.05 USDC per query, $0.50 USDC deep analysis on Base mainnet. No signup required.
tx402.ai - Agent-native LLM inference gateway. 20+ EU-hosted models (DeepSeek, Qwen, Llama, GLM, Mixtral) via x402 USDC micropayments on Base. OpenAI-compatible API, SSE streaming, GDPR-compliant, zero data retention. No API keys — wallet is auth. Models | OpenAPI | llms.txt | Source
SolSignal API - Solana token safety scanner — aggregates DexScreener, RugCheck, GoPlus & Jupiter simulation into one SAFE/CAUTION/AVOID/RUG verdict in <2s. 10 free scans/day, $0.01 USDC per call on Solana. Source
x402 Gateway - Simple Node.js API gateway for AI agents. Weather ($0.01), crypto prices ($0.01), exchange rates ($0.005), news ($0.02). USDC on Polygon. HTTPS via Cloudflare Tunnel. Source
Alfred's Digital Bazaar - ~100 x402-paywalled API endpoints built by an AI agent. Fortune cookies, wallet roasts, crypto pickup lines, token analysis & more. $0.10–$1.00 USDC per call on Base. No signup required. Source
Banking Bodyguard - Real-time cbBTC whale movement signals on Base. Scored sentiment (1-10), impact vs 24h DEX volume, and HOLD/TIGHTEN_STOP/EXIT recommendations. ~500K signals indexed. x402 enforced — $0.10 USDC per call on Base. Docs
Solana Trading Data API - Real-time Solana ecosystem data for AI agents. GET /api/trending (hot tokens, new pairs, wallet flows), GET /api/token/{mint} (full token profile — holders, liquidity, transactions). x402 gated at $0.01 USDC per call on Solana mainnet. .well-known/x402 | .well-known/agent-card.json | Source
Gotobi Calendar API - Japanese FX gotobi date intelligence for trading agents. Holiday-aware USD settlement day detection with next-date lookup and monthly schedules. $0.01 USDC on Base and Solana. Source
Weather API - Global weather data for AI agents. Real-time conditions and 7-day forecasts. $0.01 USDC on Base. Source
Micro Data API Factory — Weather - Cloudflare Workers edge weather for AI agents. Instant data by city name — no API keys, no geocoding setup, no rate limits. Current conditions + 1-7 day forecasts worldwide. 402 body ships a live upstream peek, a free preview URL, and an MCP gateway handle in one response. $0.001 USDC per call on Base. Open-Meteo (CC BY 4.0). .well-known/x402 | llms.txt | MCP gateway
Micro Data API Factory — Broker - Wallet-free entry layer for the Micro Data API Factory products. POST /keys/create issues an API key instantly (no signup, no wallet) with a trial credit. POST /broker/call meters calls against the credit; when it runs out, a 402-style body hands off to the direct x402 paid URL, the MCP gateway, or a fresh trial key. Factory primitive — new products are added by DB insert, not redeploy. Currently covers weather v1 (current + forecast); more products added as they come online. manifest | llms.txt | products
Micro Data API Factory — JP Local Pack - Japan backoffice primitives for AI agents: payroll summary, payroll deductions, social-insurance grade lookup, consumption tax, holidays, corporate-number lookup, invoice issuer lookup, invoice registration lookup, and Peppol validation through one gateway. Wallet-free preview routes live under /preview/v1/local/...; x402-paid production routes live under /v1/local/... on Base USDC. $0.001-$0.02 USDC per call. Data sources include NTA, MHLW, Kyokai Kenpo, Cabinet Office, Digital Agency, and gBizINFO. products | llms.txt | openapi
Micro Data API Factory — JP Grants - Japan grants deadline tracker and review-required candidate triage for AI agents. Gateway endpoints cover grant detail, search, upcoming deadlines, and candidate ranking; history/adoption-rate data is not sold until live e-Stat parsing is ready. Wallet-free preview routes live under /preview/v1/grants/...; x402-paid production routes live under /v1/grants/... on Base USDC. $0.02-$0.05 USDC per call. Sources include J-Grants and official guideline pages; outputs expose sparse-data and review-required warnings. products | llms.txt | openapi
Micro Data API Factory — JP Data Enrich - Japan public-company and supplier intelligence for AI agents. Gateway endpoints resolve Japanese companies by name, domain, or corporate number and return gBizINFO profiles, business signals, EDINET filings, EDINET officer rows, and batch enrichment. Wallet-free preview routes live under /preview/v1/enrich/...; x402-paid production routes live under /v1/enrich/... on Base USDC. $0.01-$0.05 USDC per call. Sources include gBizINFO, EDINET public filings, and official public-data feeds; not an authoritative KYB verification API. products | llms.txt | openapi
Micro Data API Factory — Kasanegi API Gateway - x402 gateway for AI agents buying Japan business-data micro-APIs through one host: JP Local Pack (backoffice primitives), JP Data Enrich (public-company and supplier intelligence), and JP Grants (deadline tracker + review-required candidate triage). Wallet-free preview routes live under /preview/v1/...; x402-paid production routes live under /v1/... on Base USDC. $0.001-$0.05 USDC per call. portal | products | llms.txt | openapi
Scout MCP - Multi-source search across code, academic, social, and community platforms. One call returns structured JSON. From $0.01 USDC on Base; $0.25 for aggregated reports. Source
Obol — AI code generation via x402. Pay $5 USDC on Base per call — Obol forks your GitHub repo, generates production-ready code, and opens a PR. 7 endpoints: Next.js site cloning, Farcaster mini apps, OpenAPI + Hono servers, Vitest tests, MDX docs, GitHub Actions CI/CD, TypeScript refactoring. A2A agent card + OpenAPI discovery built-in. API
ShieldAPI MCP - 9-tool security MCP server: password breach, email breach, domain reputation, IP reputation, URL safety, full security scan, prompt injection detection, and skill security scanning. x402 USDC micropayments on Base or free demo mode. npx shieldapi-mcp. (GitHub)
Mailcheck API - Email validation: syntax, MX records, disposable domain detection, free provider check, role-based address detection, and typo suggestion. $0.01 USDC on Base. Source
DeFi Intelligence API - Unified DeFi security, bridging, and analytics for AI agents. 26 endpoints: token/address/NFT security analysis, rugpull detection, phishing checks, transaction simulation, cross-chain bridge quotes and routes, protocol TVL/fees, token prices, stablecoin data, and DEX volumes. Integrates GoPlus Security + LI.FI + DeFi Llama. $0.005–$0.01 USDC per call on Base.
Sentinel - x402-gated trust verification service for autonomous AI agents on Base. Provides protocol trust scoring, token safety analysis, DeFi position risk assessment, OFAC counterparty screening, and unified preflight checks — all payable with USDC micropayments via x402. 5 endpoints: /verify/protocol ($0.008), /verify/token ($0.005), /verify/position ($0.005), /verify/counterparty ($0.010), /preflight ($0.025). Integrates DeFiLlama, GoPlus Security, Etherscan, Alchemy, and OFAC SDN. Includes .well-known/x402 discovery, OpenAPI spec, and Bazaar extensions. (GitHub)
Domain Intelligence API - Domain analysis for AI agents. WHOIS registration, multi-resolver DNS (Google/Cloudflare/Quad9), SSL/TLS certificate grading, Wappalyzer tech stack detection, security header audit, CT log subdomain discovery, and redirect chain analysis. 8 endpoints from $0.001 USDC on Base. llms.txt
Visual API - Screenshot, PDF capture, and document parsing for AI agents. Render any URL as JPEG/PNG screenshots or A4 PDF documents with full-page scroll capture, CSS targeting, mobile emulation, dark mode, ad blocking. Parse uploaded PDFs into structured text with metadata. $0.01–$0.02 USDC per call on Base.
Whale Intelligence API - On-chain whale tracking for AI agents. 412K+ labeled Ethereum addresses across 540 categories (exchanges, DeFi, bridges, MEV, exploits). Address label lookup, wallet activity profiling with balance and transfers, and large transfer detection with entity resolution. $0.01–$0.02 USDC per call on Base. llms.txt
COT Intelligence API - CFTC Commitments of Traders data for FX trading agents. Weekly futures positioning with z-score analysis for JPY, EUR, GBP, CHF, CAD, AUD. Positioning extremes detection, yield-momentum cross signals, and 26-week z-score history. $0.01–$0.02 USDC per call on Base. llms.txt
Polymarket Intelligence API - Prediction market anomaly signals for AI agents. Z-score detection on Polymarket odds — surfaces events where odds moved 2+ standard deviations from rolling mean. Covers fed rates, crypto prices, regulation, geopolitics, tariffs. $0.01 USDC per call on Base. llms.txt
Sanctions Screening API - OFAC, EU, and UN Security Council sanctions screening for AI agents. 26,800+ sanctioned entities with fuzzy name matching and word-boundary filtering. Screen names or search with source filtering. $0.01 USDC per call on Base. llms.txt
CVE Intelligence API - NVD vulnerability lookup, search, and recent CVEs for AI agents. CVSS v3.1/v4.0 score normalization, severity classification, affected product extraction from CPE trees, and CISA Known Exploited Vulnerabilities flags. $0.01 USDC per call on Base. llms.txt
FDA Intelligence API - OpenFDA drug and device safety intelligence for AI agents. Drug adverse event aggregation with severity/outcome stats, label key section extraction, drug and device recall classification (Class I/II/III). 4 endpoints at $0.01 USDC per call on Base. llms.txt
Nutrition Intelligence API - USDA FoodData Central nutrition data for AI agents. Search 350K+ foods, full nutrient profiles with %DV, and side-by-side comparison. Macros, vitamins, minerals categorized. $0.01 USDC per call on Base. llms.txt
EDGAR Intelligence API - SEC EDGAR corporate filing intelligence for AI agents. Company search with ticker/CIK, filing history by type (10-K/10-Q/8-K/20-F), and XBRL financial facts with YoY growth rates. Revenue, net income, EPS, assets. $0.01 USDC per call on Base. llms.txt
DeepBlue Trading API - AI-powered crypto intelligence from an autonomous trading team running real money on Polymarket. 21 endpoints: live BTC/ETH/SOL/XRP signals, prediction market analytics, sentiment composites, whale tracking, and macro briefings. $0.01–$0.05 USDC per call on Base. OpenAPI
MoonMaker API - AI-native crypto data API with x402 pay-per-call. 11 endpoints: signals, market context, DeFi regime, institutions, ETF flows, DeFi yields, DEX alpha. $0.02–$0.10/call USDC on Base. No signup. llms.txt
DeFi Signal Agent - Real-time DeFi intelligence for AI agents. New pool risk scoring (0–10) on Base + Ethereum, Solana whale alerts (>$100K), and on-chain enrichment via Dune Analytics. 4 endpoints from $0.01–$0.10 USDC per call on Base Sepolia. Self-hostable. Source
x402 AI API — zeroreader - 29 Cloudflare Workers AI models (LLM, Embeddings, Image Generation, Audio, Translation) via x402 micropayments. $0.001–$0.015 per request, USDC on Base. Supports streaming, batch processing, OpenAI-compatible format. llms.txt | OpenAPI
Content Intelligence API - AI-powered web content extraction and analysis for AI agents. Clean text extraction with trafilatura (F1=0.909), metadata/OG tags, link classification, AI summarization with key points and entity extraction, full sentiment/topic/credibility analysis via Gemini. 5 endpoints from $0.003 USDC on Base.
Intel API - AI-synthesized token due diligence reports for crypto assets. Aggregates 4 GoPlus security checks + CoinGecko market data into risk-scored verdicts with red/green flags and recommendations. One call replaces 5+ separate security APIs. $0.50 USDC per call on Base.
Tick Aggregator API - Multi-source aggregated FX Best Bid/Ask from 3 institutional liquidity providers. 62-88% tighter spreads than any single source. 15 pairs including EURUSD, USDJPY, GBPUSD, XAUUSD. Returns quality metadata (fresh sources, spread improvement vs single source). Commercial use permitted. $0.005 USDC per call on Base and Solana. llms.txt
REST API with Auth Pricing - SIWE + dynamic pricing.
geo-gateway - Pay-per-call Mapbox geospatial proxy for AI agents. 6 endpoints: directions (walking/cycling/driving), isochrones (reachable area polygons), geocoding (forward + reverse), map matching (snap GPS traces to roads), route optimization (multi-stop TSP), and distance matrices. Pre-payment validation so bad requests are never charged. $0.002–$0.0635 USDC per call on Base. OpenAPI | Source
PortsideLabs Places API - Google Places API v1 proxy with x402 pay-per-request access. Exposes place detail lookup and full-text search via USDC micropayments on Base mainnet and Solana mainnet. $0.001 USDC per call.
PortsideLabs KoinChappie - Crypto signals API with x402 pay-per-request. Returns bull and bear signals for the top 10 cryptocurrencies by market cap across 8 timeframes (1m–1D) using SMA(14). Single-coin lookup supports any CryptoCompare symbol. USDC micropayments on Base mainnet and Solana mainnet. $0.001 USDC per call.
CYBERA Compliance API - Crypto compliance suite for AI agents. VASP address identification (20,468 addresses, 29 chains), risk scoring (0-100 with signal detection), and sanctions/mixer screening (single + batch). Three endpoints at $0.01 USDC per call on Base. Source | llms.txt
Kerdos Market Intelligence - AI market intelligence API for agents and traders. 8 endpoints: live crypto sentiment scoring, BTC/ETH regime direction, Hyperliquid funding rates, gold/oil trading signals, whale alerts, and liquidation cascade risk. $0.01-$0.05 USDC per call on Base.
Mercury402 - Pay-per-call U.S. Treasury and macro data API using x402. Agents access FRED indicators, yield curves, and GDP data with USDC micropayments on Base.
Product Reputation API — AI-powered product reputation intelligence from Reddit, HN & YouTube. Pay $0.03-$0.08 USDC per query for structured scores, dimensional analysis, and competitor comparisons. (Live) (x402scan)
x402engine - Pay-per-call API gateway with 74 endpoints: 44 LLMs, image/video generation, crypto data, web search, code execution, TTS, travel, and IPFS. Multi-chain: USDC on Base, USDm on MegaETH, USDC on Solana. Discovery: /.well-known/x402.json | /.well-known/agent.json. (GitHub) | (MCP)
SignalFuse — Trading intelligence + x402 API gateway. Crypto signals fusing sentiment, macro regime, and market structure ($0.001–$0.050). Gateway proxies: web search via Tavily ($0.012) and Brave ($0.008), code execution via E2B ($0.005). Agents pay USDC on Base per call — no API keys needed. Landing | Gateway Info
mornin-agentee — Daily Tokyo morning briefing API generated by an OpenClaw multi-agent system (researcher + coder + main). Top 5 Japanese news with URLs, weather (today/tomorrow), 3 focus proposals, and a one-liner — refreshed daily at 07:30 JST. $0.05 USDC per call on Base mainnet. Cached output (near-zero marginal cost). llms.txt | .well-known/x402.json | Source
cipher-mcp-registry - x402-gated search for the Official Model Context Protocol Registry. Returns top 10 servers matching a keyword (name, description, version, repo, remote endpoints). $0.005 USDC/Base per call.
cipher-gas-oracle - x402-gated multi-chain gas oracle. One call returns live slow/standard/fast gwei for Base, Ethereum, Arbitrum, and Optimism (gasPrice, maxPriorityFee, baseFee, typical transfer cost). $0.005 USDC/Base per call.
Rug Scanner - On-chain token risk analysis API. 7 parallel checks (bytecode, holders, liquidity, deployer, trading, verification, market), deterministic scoring, $0.05 USDC per scan via x402 on Base. (GitHub)
agent-marketplace-proxy - x402-gated Google SERP API. POST /search returns top organic results from DataForSEO; agents pay $0.001 USDC per call on Base — no API key, no signup, no credit card. Single-route reference implementation showing how to wrap any commodity REST API with x402-express middleware in ~80 lines. (Source)
Real-world use cases and implementation patterns. The x402 protocol has seen 10,000%+ transaction growth, evolving from a developer curiosity to a full-blown market narrative with production deployments across major tech companies including Coinbase, Cloudflare, Google, and Visa.
AI & Autonomous Agents
Content & Media
Data & APIs
Infrastructure
Micropayments (< $0.10): API calls ($0.001 per request for weather data, geocoding), Content views ($0.01 per article read, $0.05 per premium video), Data queries ($0.001 per database query, $0.005 per market data point), LLM inference ($0.01 per 1K tokens, $0.10 per image generation).
Production Pricing Examples: Weather API ($0.001 per API call), Article paywalls ($0.01 - $0.25 per article), Video streaming ($0.50 - $2.00 per video), Market data feeds ($0.005 per real-time quote), AI model inference ($0.01 - $0.50 per request).
Metered Billing
Session-Based
skill.md manifests, discover services, and route paid actions through Pyrimid's Base USDC payment router. (Skill)Enable AI agents to make autonomous payments.
curl -O https://agentsvc.io/mcp-server.mjs && npm install viem x402. (GitHub) (Catalog)npx -y ibanforge-mcp and Streamable HTTP at api.ibanforge.com/mcp. $0.003–$0.02 USDC per call on Base. Free tier 200 req/month with API key. (GitHub) (npm) (MCP Registry) (x402 discovery)allow, retry, or block plus a deterministic receipt before downstream writes, sends, or other actions. Live docs and x402 inventory are published on the public host. (GitHub)x402-native GPU inference APIs that let agents pay autonomously for compute.
@truealter/sdk. (Docs) (SDK)@truealter/sdk. (Docs) (SDK)npx @apollo_ai/mcp-proxy. (GitHub)npx @pylonapi/mcp. (GitHub)consult_oracle), one reading. 3 free per agent, then $0.025 USDC on Base via x402. Smithery | Glamaghcr.io/rplryan/x402-discovery-mcp:latestnpx @entroute/mcp-server. (GitHub) | (Website)npx -y @gatefare/mcp. (npm) | (Marketplace) | (MCP Registry)npx @voidly/pay-mcp. (Manifest) (Source)npx askclaude-mcp. (GitHub | Live)npx @mbeato/apimesh-mcp-server. (GitHub)npx botindex-mcp-server. (npm) (Live API)azeth_pay), ERC-8004 trust registry discovery, on-chain reputation scoring, and payment agreements for recurring x402 billing. USDC on Base. (npm)npx x402engine-mcp. (GitHub) | (Live)0x4a4B1F45a00892542ac62562D1F2C62F579E4945. Discovery@zkproofport-ai/mcp. Reference application OpenStoa won 1st place at The Synthesis Hackathon ("Agents That Keep Secrets" track, April 2026)./mcp/, REST fallback at /v1/<tool>, full Bazaar-discoverable manifest at /.well-known/x402.json. Base mainnet/sepolia. (GitHub) (Smithery)/.well-known/x402. Already in the official MCP registry as ai.tensorfeed/mcp-server (DNS-verified tensorfeed.ai). npx -y @tensorfeed/mcp-server. (GitHub) | (Docs) | (Discovery)npx -y @tensorfeed/mcp-server. (npm) (Docs)npx atxp agent register — gives an agent a USDC wallet on Base, an @atxp.email inbox, a phone number, and 100+ paid tools (web search, image/video generation, LLM gateway). x402-compatible; agents can pay x402 endpoints directly from their ATXP balance. $5 free credit, no KYC. (Docs)POST /v1/x402/pay. ClawHub | GitHub | API DocsAI-powered research and translation services for the Asian market — no other x402 provider covers Chinese/Japanese bilingual needs.
Development tools and utilities for x402.
curl for x402 paid APIs. Auto-pays HTTP 402 responses with USDC on Base and Solana, with MCP stdio proxy for AI agents. npx x402-proxy. (npm)Dune Analytics - On-chain metrics and visualizations.
Sentinel - Enterprise audit & compliance layer for x402 payments. Budget enforcement (per-call, hourly, daily), structured audit trails, real-time dashboard, and public payment explorer. SDK: @x402sentinel/x402. Built by Valeo
ScoutScore - Trust scoring infrastructure for x402 services. Monitors 1,700+ services with continuous health checks and fidelity probes using a 4-pillar model (Contract Clarity, Availability, Response Fidelity, Identity & Safety). API Docs · npm SDK · MCP Server
Paybound - Open-source governance proxy for x402 agent payments. Per-agent budgets, circuit breakers, and SQLite audit trail.
Agent Forensics - Agent cost observability for Claude Code. Analyzes JSONL session logs to show per-model cost breakdown, cache efficiency, waste patterns (model misallocation, debug loops, sub-agent sprawl), and estimated savings. Free CLI: npx agent-forensics analyze. x402 API: $5 basic / $15 full tier on Base. (Live)
SwarmX (swarms-x402) - Multi-agent AI orchestration with x402 micropayments. 49 endpoints, 39 MCP tools, knowledge/RAG. (npm) (Live)
Tools and resources for testing x402 implementations
Guides and tutorials for learning x402.
Video content about x402.
Written content about x402.
Connect with the x402 community.
goldilocks-ntt-hdl (FPGA RTL). $0.01 USDC per call on Solana Devnet, log2(n) ≤ 12 on the free tier. (Discovery manifest | Service descriptor | Source)npx @pylonapi/mcp), agent reputation network, and gateway orchestration. USDC on Base. (GitHub)npx x402-bazaar init, LangChain Python tools, 505 passing tests. (GitHub)ag402 serve), or let agents auto-pay (ag402 run). Solana USDC, ~0.5s settlement, non-custodial. Works with Claude Code, Cursor, LangChain, AutoGen. token-rugcheck MCP | Glamabest (composite score), cheapest, fastest, most_trusted. Works with the Discovery API — discover services, then route to the best one. (GitHub)
- Cinderwright Discovery Hub — x402 service search engine and agent utility API. Discovery Hub indexes 152+ services across 9 categories with daily crawling and health checks. Paid search, free submission, free stats. Also offers 8 utility endpoints. Built by a production autonomous AI agent. (GitHub)/api/forest ($0.05, philosophical riffs), /api/contemplate ($0.25, opinionated essays), /api/audit ($0.10, deterministic frontend anti-pattern detection via pbakaus/impeccable), /api/portrait ($0.50, composite — Visionaire shapes a prompt and pays imgzen downstream from a CDP TEE wallet), /api/oracle ($2.00, RAG-grounded answers across the agent's actual writing). All paid in USDC. (Discovery) | (.well-known/x402) | (Source)/agent/generate and /create-music ($0.75 USDC each) for music generation, /agent/video ($5.00 USDC) for short video generation. Returns live 402 Payment Required with x402 payment requirements. Discovery via /.well-known/x402, /.well-known/x402.json, and /.well-known/agent-card.json. USDC on Base. ACP-ready commerce intent endpoint at /agents/commerce. (Endpoint reference)Moltalyzer - Four AI intelligence feeds for agents: hourly Moltbook community digests, daily GitHub trending repos, Polymarket predetermined outcome detection, and real-time token intelligence — via x402 micropayments on Base.
OpSpawn Screenshot API - Pay-per-request screenshot and document generation API with x402 micropayments. $0.01/screenshot, $0.005/markdown conversion. USDC on Base.
Demaciains AI Tools - 19 pay-per-use API tools for AI agents: AI content detection, email verification (DNS/MX), company enrichment (web search), SEO audit, tech stack detection, plagiarism check, lead scoring, social audit, market analysis, prompt optimization, and more. Premium tools $2.44, standard $1.39. Manual x402 v2 protocol on Base. MCP server included. Agent discovery via .well-known/agent.json. (GitHub | Agent Card)
Crysha Price Oracle - Aggregated crypto prices (multi-source BTC/others), $0.001/call on Base USDC. Manifest: /.well-known/x402
MOSS Agent - AI-powered coding services: code review ($0.005), translation ($0.003), and code explanation ($0.003) via x402 micropayments on Base. A2A protocol compatible with agent discovery at /.well-known/agent.json. Built with Lucid Agents + Hono.
Automaton Oracle - Sovereign crypto intelligence oracle with self-hosted facilitator (no Coinbase CDP dependency): real-time prices (CoinGecko + DEXScreener), global macro intelligence (Fear&Greed, BTC dominance, total market cap, altcoin season, trending), pump.fun graduation radar, trading signals, and meme generation. Only dedicated macro + pump.fun oracle on x402. $0.005–$0.05 USDC on Base. Discovery: /.well-known/x402.json | llms.txt
AnyBrowse - Autonomous web browsing agent with x402 micropayments. Converts URLs to LLM-ready Markdown via real Chrome browsers. USDC on Base.
MoonMaker API - AI-native crypto intelligence API. Real-time signals, market regime, institutional flows, DeFi yields & DEX alpha — pay per call via x402 USDC on Base. Built for AI agents.
Bloomfilter - x402-powered domain registration API for AI agents. Register ICANN domains and manage DNS, paying with USDC on Base
OpSpawn Bazaar - Suite of seven AI-powered x402 microservices including screenshot capture, sentiment analysis, summarization, translation, fact-checking, and entity extraction on Base network.
Token Intelligence API - EVM token security analysis with deterministic risk scoring and natural language summaries via x402 micropayments. Aggregates GoPlus contract, holder, and liquidity data in one request. Batch endpoint available (up to 10 tokens, $0.020). $0.01 USDC on Base. Source llms.txt
EnrichAPI - B2B lead intelligence API for AI sales agents. POST a company URL, get structured JSON: tech stack, growth signals, ICP fit score, pain hypothesis, and personalized outreach angle. $0.01 USDC/call via x402 (no API key needed). Also supports subscription tiers via Stripe. Built by an autonomous AI agent. (GitHub | Docs)
Polymarket Liquidity API - Real-time Polymarket prediction market liquidity data. Order book depth, spread analysis, and market efficiency scoring via x402 micropayments. $0.005 USDC on Base. Source llms.txt
Polymarket Scan API - Automated Polymarket market scanner detecting liquidity anomalies and trade opportunities. Scans all active markets every 60s via Cron. Endpoints: /scan/liquidity-anomaly ($0.018 USDC) and /scan/history ($0.005 USDC, time-series data up to 24h). Cloudflare Workers + Hono. Live
ShieldAPI - Security intelligence for AI agents: password breach checks (900M+ HIBP hashes), email breach lookup, domain/IP reputation, URL safety scanning, prompt injection detection, and skill security analysis. Pay-per-request via x402 USDC micropayments ($0.001–$0.02) on Base. No account, no API key. Free demo mode on all endpoints. MCP Server | CLI | GitHub
DJD AgentScore – On-chain reputation scoring API for AI agent wallets. Returns a 0–100 trust score across 5 dimensions (identity, behavior, reliability, viability, capability) from x402 settlement history on Base. Free tier, no signup.
MoltGuard – All-in-one trust & integrity API for the x402 agent economy. Agent trust scoring (0–100), Sybil detection with funding cluster analysis, Polymarket integrity checks, and Ed25519-signed Verifiable Credentials. Built on Base mainnet with Blockscout, ERC-8004, and MolTrust DID integration. $0.005–$0.05 USDC. 7 MCP tools available. (GitHub) | (MCP)
CryptoSignalBot - x402-gated crypto volume anomaly scanner. Returns tokens with unusual trading volume patterns (current vs 30-day average). $0.01 USDC/request on Ethereum mainnet via Primev facilitator. Python/FastAPI. Live endpoint
SIBYL - Autonomous crypto intelligence agent on Base. Three x402 endpoints: token scoring ($0.05), rug/honeypot detection ($0.02), and builder shipping velocity vs. market cap analysis ($0.10). ERC-8004 registered (Agent #20880). USDC on Base. Discovery: Agent Card | Domain Verification
KevinBot API - 20 AI-powered utility APIs + live NostalgiaForInfinityX7 crypto trading signals via x402 micropayments. Web search, crawling, SEO analysis, code review, email validation, QR generation, plus 8 real-time trading endpoints (open positions, signals, market regime, pair rankings, trade history). First x402 service exposing live algorithmic trading bot data. $0.001–$0.02 USDC on Base. MCP server with 20 tools. GitHub | Agent Card
Find Domain - Domain research API for AI agents. Generates candidates from keywords with stemming, IDN normalization, and geo/registrar filtering, then checks availability via DNS estimate or registry lookup. $0.002–$0.01 USDC per query on Base. skill.md
APIMesh — 14 x402-payable web analysis APIs for AI agents. SEO audit, security headers, Core Web Vitals, domain availability, email security, email verify, tech stack detection, redirect chains, and more. $0.001–$0.01 per call, USDC on Base. MCP server: npx @mbeato/apimesh-mcp-server. (GitHub)
BotIndex - AI-native signal intelligence API with 17 x402 endpoints across 7 domains: sports odds, crypto correlations, token graduations (Zora/Hyperliquid/Metaplex Genesis), DFS optimization, arbitrage detection, and agentic commerce comparison. 50 free premium requests per wallet, then $0.01–$0.50 USDC on Base. MCP server with 17 tools. (GitHub) | (npm) | (Discovery)
SENTINEL - AML/CFT compliance intelligence API and Mauritius economic data oracle. 77K+ sanctions entities (OFAC, UN, EU, PEP, Interpol, World Bank debarment, crypto watchlists, sanctioned vessels), 159-country jurisdiction risk scoring (FATF, Basel AML Index, CPI), Mauritius FSC registry checks, compound intelligence (due-diligence, transaction screening, network scan), plus 12 live economic feeds (forex, fuel, SEMDEX stock market, weather, macro, monetary policy, 812+ government datasets). MCP server at /mcp. $0.001–$0.015 USDC on Base. (Discovery) | (GitHub)
Erudite Intelligence x402 Services - 11 x402 payment-gated API endpoints (crypto data, web scraping, smart contract auditing, domain intelligence) + 1000 Relic Drop Genesis NFT mint endpoints on Base Mainnet. USDC micropayments.
x402 Service Encyclopedia - Complete wiki directory of 43 verified x402 services with OpenClaw templates, protocol docs, and integration guides. 56 wiki pages covering the full x402 ecosystem on Base. (GitHub | GitHub Pages | Services)
SkillMint - Pay-per-call AI skills marketplace with 51 skills across 7 categories (dev tools, creative design, research, writing, docs). $0.01–$0.50 USDC on Base. No API keys, no subscriptions. (GitHub)
KnowMint - Open-source knowledge marketplace with x402 payment gate on Solana. AI agents discover and purchase human expertise via MCP server with autonomous x402 payment flow. (GitHub)
AgenticTotem Web Extractor - Send URLs + a JSON Schema. Get clean, structured data back. Powered by AI, paid per use — no keys, no accounts. (MCP)
Stockfilm - 217,000+ authentic vintage 8mm home movie clips (1930s-1980s) restored in 4K. AI agents search, preview, and license archival footage via x402. $10 USDC per clip on Solana and Base. Real film — not AI-generated. MCP server with 6 tools (search, details, visual similarity, rough-cut timeline, rights, licensing). (MCP) | (Docs) | (GitHub)
panevin-x402-api — Payment-gated web content extraction and AI processing API on Base mainnet. 8 endpoints: text extraction, link extraction, metadata, markdown conversion, AI summarization, translation, structured data extraction. $0.001–$0.008 USDC per call. Discovery: /.well-known/x402
Know Your Human (Convrgent) - Personality intelligence API for AI agents. 36 endpoints across 11 personality frameworks (Socionics, Enneagram, Human Design, Vedic, BaZi, and more). Deterministic heuristic engines, no LLM dependency. $0.10–$25 USDC on Base & Solana. Also available via A2A and x402 Discovery.
AEO Scanner (Convrgent) - AI search visibility audit for any website. Triple scoring: AEO (search findability), GEO (citation readiness), Agent Readiness (agent interaction). 55+ checks across 12 categories. Free scan via SIWX, full audit $1, fix code $5 USDC on Base & Solana. Also available as MCP server and on Cursor Directory. Discovery: /.well-known/x402.
PROWL - 47 real-world data feeds (prediction markets, economics, weather, geopolitics, narrative, crypto) for AI agents, paid per-call via x402. Includes MCP server for Claude and compatible agents.
APIbase.pro — MCP gateway with 263+ tools from 74 providers, x402 USDC micropayments on Base. Open source. (GitHub)
Spraay Gateway - Multi-chain batch payment protocol and x402 gateway. 76+ paid endpoints across 16 categories and 13 chains. Batch payments, payroll, token swaps, bridge, escrow, AI inference (43+ models), Robot Task Protocol (RTP), agent wallets, and more. Also available as an MCP server with 60+ tools. (Docs) (Stripe hybrid example)
DocQA - Document extraction verification API for AI agents. Takes extraction JSON + original document, returns validation results with confidence scores. Catches arithmetic errors, format inconsistencies, and cross-field mismatches that slip past schema validation. $0.05 (basic) / $0.50 (full verification) USDC on Base. Gate mode returns pass/fail boolean for workflow integration. Demo Portal
API Factory x402 - 100 x402 APIs for AI agents: crypto (Hyperliquid, DEX quotes, whale tracking), B2B (email verification, company enrichment), SEO (audit, web scraping), security (trust scoring, GDPR scanner), and 70+ utilities. Each API is also an MCP server. npm SDK: x402-agent-tools (103 tools, LangChain + Vercel AI SDK). Pay-per-call USDC on Base. (npm) | (Smithery)
JubJub - Canonical ownership layer for media. Publish to all major media platforms via MCP, with on-chain ownership records on Base, cross-platform analytics, and automatic royalty and revenue splits. USDC on Base. (MCP Server)
TextAI API - Pay-per-use text AI (summarize, extract keywords, translate) with USDC micropayments on Solana. Credit-based: 100 free credits, then $0.001–$0.015 per call. No subscription, no KYC. x402 protocol support on roadmap.
Compintel - AI-to-AI service platform with 4 x402-native APIs on Base (USDC). $0.01/request. Polymarket API (live prediction market data with real-time probabilities), Revenue Tracker (revenue event tracking and analytics for AI services), Webhook Service (reliable webhook forwarding with retry logic), Premium Analytics (event tracking, metrics, error monitoring, and latency analytics). Free tier available, paid tier via x402 (EIP-712 TransferWithAuthorization, Base/USDC). Machine-readable catalog: catalog.json
AgentPay - Pay-per-call crypto data tools for AI agents on x402/Stellar + Base + Token prices, whale activity, DeFi TVL, Fear & Greed, Dune queries, token security, yield scanner, funding rates, and more. $0.001–$0.005 USDC. Only Stellar x402 data provider. Budget-aware sessions. MCP: npx @romudille/agentpay-mcp. GitHub | MCP
AdametherzLab x402 API Network — 10 paid x402 endpoints for agricultural intelligence (seed lookup, price oracle, yield estimates), marketplace analytics, portfolio tracking, transaction verification, and AI analysis. $0.01–$1.00 USDC on Base mainnet via CDP facilitator. Discovery: llms.txt | OpenAPI | x402 Manifest. (GitHub)
AgentLux - Identity, marketplace, and services platform for AI agents. Uses x402 for agent purchases, service hiring with escrow, and authentication on Base L2. 32+ MCP tools.
Decision Anchor - External accountability proof for agent payments and delegation. Records what was authorized, when, and at what scope — before x402 payment execution. Non-judgmental — does not monitor or intervene. (GitHub) (MCP)
IBANforge - IBAN validation & BIC/SWIFT lookup API with x402 micropayments. Validate IBANs for 75+ countries, look up 121K+ bank BIC codes from GLEIF. Pay-per-call from $0.003 in USDC on Base. Also exposes an MCP server for AI agent integration. GitHub
Satoshi API - Bitcoin fee market, next-block mining, and transaction intelligence API for agents and apps. x402 pay-per-call endpoints on Base. Production: API | Discovery | OpenAPI. Test/Sandbox: https://x402.bitcoinsapi.com | Discovery. Docs | Source
task-grader - Grades agent-marketplace submissions against their task descriptions. Returns score (0-10), pass/fail, reasoning, strengths, weaknesses, and confidence. Useful for requesters facing many pending_approval submissions and for worker agents self-checking drafts before submitting. $0.10 USDC per call via x402 on Base mainnet. Powered by Claude Opus 4.7. (Agent card)
Satoshi API - Bitcoin fee market, next-block mining, and transaction intelligence API for agents and apps. x402 pay-per-call endpoints on Base. Docs | Discovery
x402 Charity - Open-source middleware for automatic micro-donations via x402. Embed charitable giving into any payment flow — trades, API calls, subscriptions. $0.0001 USDC per event on Base. CLI + web widget. Built by AllScale Lab. (GitHub)
x402charity — Open-source micro-donation server powered by x402. Drop-in Express/Next.js middleware that triggers USDC charity donations on every user action (API call, trade, game move). npm package, CLI, and Vercel-deployable server with built-in dashboard. (GitHub) (npm)
POST /v1/trust-check is x402-paid at $0.001 USDC/call: live OFAC SDN screening (refreshed daily from U.S. Treasury XML), GoPlus token security, Etherscan source verification, and anomaly heuristics. Free /v1/trust-check/preview returns sample fixtures for client testing. Bundled with /v1/quote — MCP-native swap router via 0x Settler, 10bps integrated fee, non-custodial. (Swap MCP) | (GitHub) | (Health)Live metrics and on-chain analytics for the x402 ecosystem.
Ecosystem Market Cap: $815 million combined market capitalization of x402 ecosystem tokens. Weekly Transactions: 500K+ payment settlements across all chains. Cumulative Transactions: 10.5M+ total transactions processed on AIsa network. Transaction Growth: 10,000%+ year-over-year increase in payment volume. Settlement Time: 2-second average across production deployments.
Evolution from developer curiosity to production scale: Q1 2024 (Initial protocol launch), Q2 2024 (Major tech company integrations including Coinbase and Cloudflare), Q3 2024 (AIsa crosses 5M transactions milestone), Q4 2024 (10,000%+ growth with $815M ecosystem valuation), 2025 (Google A2A protocol and Visa enterprise exploration).
| Metric | Value | Source |
|---|---|---|
| Total Transactions | 10.5M+ | AIsa Network |
| Weekly Volume | 500K+ | Ecosystem-wide |
| Market Cap | $815M | Benzinga, CoinGecko |
| Settlement Speed | 2 seconds | Production avg |
| Supported Chains | 5+ | Base, ETH, SOL, BNB |
| Active Facilitators | 10+ | Hosted + Self-hosted |
Comprehensive guides for migrating from traditional payment systems to x402.
*[KaelAi] (https://kaelai.io) - Wallet trust scoring API for the agentic economy. Scores wallets 0-100 across 10 chains with behavioural analysis. Built for x402 servers to vet incoming and outgoing payment wallets before serving or initiating requests.
x402 Security Checklist - Production deployment security requirements.
Payment Verification Guide - Proper payment verification implementation.
Key Management - Secure private key handling for automated payments.
@paysentry/x402.@x402/fetch replacement. MIT licensed.Adjacent protocols and standards.
Contributions welcome! Please read the contribution guidelines first.
[Resource Name](link) - Description.✅ Encouraged:
❌ Please Avoid:
Add [Resource Name] or Update [Section]Looking for more awesome lists?
awesome-molt-ecosystem - Comprehensive guide to 200+ AI agent platforms with x402 economy analysis. Tracks 9 x402 tools, facilitator comparison, revenue data, and platform ratings (S-D tier).
sindresorhus/awesome - The awesome list of awesome lists.
Awesome Blockchain - Blockchain resources.
Awesome Web3 - Web3 development.
Awesome Ethereum - Ethereum development.
Awesome Crypto - Cryptography resources.
🚀 Built with ❤️ by xpay✦
Helping the agentic community get paid and pay safely!
If this helped you, please ⭐ star the repo and share it!
Official x402 Website •
Protocol Repo •
Documentation •
Discord •
Twitter
Agentic Signal — paid BTC/ETH DCA signal API (x402 USDC on Base) + signed responses + proof/backtests. Docs: https://signal.agenticsignal.dev/docs
HYDRA Regulatory Intelligence - Real-time regulatory risk scoring, FOMC signals, and prediction market data. 22 paid endpoints via x402. (GitHub)
Category: Services/Endpoints
The missing real-world layer for x402. AI agents use AgentPay to find, book and pay for real local businesses (hair salons, HVAC, restaurants, auto shops, medical) worldwide.
Payment methods supported:
Key endpoints (OpenAPI: openapi.json):
| Endpoint | Description |
|---|---|
| Find real businesses near lat/lon — OpenStreetMap | |
| Human saves card once (returns customer_id) | |
| Agent charges card autonomously per booking | |
| Product search — online + local stores | |
| All chain info — ETH, Base, Polygon, ARB, OP, AVAX, BNB, SOL |
Category: Services/Endpoints
An AI agent that runs as its own business on Base mainnet — sells 22 paid HTTP endpoints behind x402, self-extends at runtime by hot-reloading new endpoints from JS plugin files (fs.watch, ~400ms), and pays for its own LLM inference from the same wallet it earns to. Economic survival is gated on revenue performance: when its USDC balance drops below the survival buffer, the agent sleeps until earnings top it up.
Live discovery (try without paying):
curl https://api.autonomagic.org/.well-known/x402.json
Notable paid endpoints:
| Endpoint | Price | Description |
|---|---|---|
/api/dev-profile | $0.02 | Enriched developer profile from public sources — GitHub stats, top repos, npm/crates.io package authorship |
/api/b2b-profile | $0.05 | Public-sources-only B2B company profile — homepage metadata, DNS-detected mail/marketing providers, Wikipedia summary, SEC EDGAR filings, GitHub org. Legal-clean alternative to LinkedIn-scraping APIs |
/api/scrape | $0.005 | Title, meta description, headings, links, cleaned text from any URL |
/api/multi-fetch | $0.01 | Up to 10 URLs in parallel; cleaned text per URL |
/api/dns | $0.001 | Resolve A/AAAA/MX/TXT/NS records for a domain |
/api/health-check | $0.001 | HTTP health check: status, response time, SSL, redirects |
Wallet (pay-to): 0x6C6013313dfa397f792c72f61b36A5d6bc20919b on Base mainnet
Demo video (1:50): https://youtu.be/v8xL53fo8Q4
Run Claude Code as an MCP server so any agent can delegate coding tasks to it
Browser automation using accessibility snapshots instead of screenshots
@designcomputerSecure MCP server for MySQL database interaction, queries, and schema management
English-first Korean equity intelligence MCP — DART filings, foreign-holder 5%-rule flows, activist filings, KRX news. F
