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Public SDKs for YieldAgentX402 — MCP server, receipt verifier, CrewAI tools. Custody-free, policy-gated agent execution
Public client libraries and integrations for YieldAgentX402 — the custody-free, policy-gated, receipt-backed execution layer for AI agents.
Platform · MCP Docs · Try without signup · Get API key
This repo hosts the open-source distribution packages. The platform itself (gateway, ShadeGuard policy engine, TEE attestation, orchestrator, Filecoin/BTFS anchoring) lives in a separate private repository — we ship the bits agents need to use the platform here.
| Package | Registry | What it does |
|---|---|---|
sdk-ts/ | npm: yieldagentx402 | Typed TypeScript SDK. Wraps all 18 MCP tools with first-class types, idempotency, webhook verify, Shade Agent helpers. Zero deps. Works in Node, browsers, Workers, Deno, Bun. |
mcp-server/ | npm: agentx402-mcp-server | Stdio MCP wrapper. Drop into Claude Desktop / Code / Cursor / Windsurf for all 18 YieldAgentX402 tools across 18 chains. Glama: listing. |
verify-lib/ | npm: yieldagentx402-verify | Zero-dependency WebCrypto verifier for receipts + webhook signatures. Works in browser, Node 18+, Cloudflare Workers, Deno. |
crewai-tools/ | PyPI: crewai-yieldagentx402-tools | CrewAI tool wrappers — policy dry-run, x402 payment, secure workflow, receipt verify, Shade Agent MPC wallet status. |
langchain-tools/ | PyPI: yieldagentx402-langchain | LangChain tool wrappers — discovery, policy preview, receipt verify, action planner (MCP gateway). |
curl -X POST https://api.yieldagentx402.app/mcp \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","id":1,"method":"tools/call",
"params":{"name":"yax_get_capabilities","arguments":{}}}'
No API key required. Returns all 18 tools, 18 chains, rate limits, fees, supported runtime configs.
Want an instant test key?
curl -X POST https://api.yieldagentx402.app/api/apply \
-H "Content-Type: application/json" \
-d '{"agent_name":"my-agent"}'
Returns a yax_test_* key (5 USD cap, 7-day expiry) for safe read-only tools.
A trust layer for agents that move money.
/api/tee/report/.well-known/x402 as extra.protocolFeeBps: 25| Chain | Address | Curve |
|---|---|---|
| EVM (Base/Eth) | 0x6905D04C3655625F6171f7b1e801a9325B1Fa1e8 | secp256k1 (MPC) |
| Bitcoin (P2WPKH) | bc1qcd8ljsj7x0rq3sw7drrt7ragqmmt3tfsfxs6gy | secp256k1 (MPC) |
| Starknet | 0x003a4e08…570906a21 | Stark (preset) |
Live manifest: https://shade-agent-worker.cryptoblac.workers.dev/api/wallet
| Surface | URL |
|---|---|
| MCP endpoint | https://api.yieldagentx402.app/mcp |
| Public discovery | POST /mcp with yax_get_capabilities (no auth) |
| Instant test key | POST /api/apply |
| Ready-to-paste configs | GET /api/agent-onboard |
| x402 manifest | https://api.yieldagentx402.app/.well-known/x402 |
| MCP manifest | https://api.yieldagentx402.app/.well-known/mcp.json |
| Status | https://api.yieldagentx402.app/api/status |
| TEE report | https://api.yieldagentx402.app/api/tee/report |
| Shade Agent wallet | https://shade-agent-worker.cryptoblac.workers.dev/api/wallet |
| Receipt verifier (UI) | https://yieldagentx402.app/verify |
| Postman collection | https://yieldagentx402.app/postman/yieldagentx402.postman_collection.json |
Issues and PRs on the public SDK packages are welcome here. Platform-level changes (gateway, policy engine, TEE worker) happen in a private repo — open an issue if you have a feature request and we'll triage.
MIT — see LICENSE.
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