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 16 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 to give any MCP client all 16 YieldAgentX402 tools across 18 chains.
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 16 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.

• 16 MCP tools — discovery, secure workflow execution, x402 payment settlement, policy dry-run, 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.