yieldagentx402-sdks

YieldAgentX402 SDKs

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.

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Packages in this repo

| 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). |

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Try without signup

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.

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What is YieldAgentX402?

A trust layer for agents that move money.

• 18 MCP tools — discovery, secure workflow execution, x402 payment settlement, policy dry-run, approvals, receipt verification, attestation, finance/CRM skill tools
• 18 chains — Base, Ethereum, Bitcoin (native), Starknet, NEAR, Solana, Stacks, BNB, Rootstock, Filecoin EVM + native, Aptos, Sui, TON, Tron, XRPL, Stellar, Algorand
• Custody-free wallet — one NEAR MPC key authority derives EVM + BTC addresses on demand. No private keys held by the gateway or worker. Starknet uses Stark curve preset.
• Intel TDX TEE attestation — mrEnclave verifiable at /api/tee/report
• HMAC-SHA256 receipts — every call returns a signed receipt
• Filecoin + BTFS dual anchoring — permanent tamper-proof proof storage
• x402 protocol settlement — 0.25% protocol fee, machine-verifiable in /.well-known/x402 as extra.protocolFeeBps: 25

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Custody-free wallet — one MPC key, three chains

| 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

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Live infra

| 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 |

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Contributing

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.

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License

MIT — see LICENSE.