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.
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). |
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.
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
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
Live infra
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.
License
MIT — see LICENSE.