fpds-mcp

x402-paid MCP server for the U.S. Federal Procurement Data System (FPDS-NG) — every federal contract action since 2001, no signup, no API key.

Live: https://fpds-mcp.mtree.workers.dev

Endpoints

All paid endpoints settle USDC on Base via x402. First call returns HTTP 402 with the EXACT-scheme envelope; sign X-PAYMENT and retry.

Discovery surfaces (unpaid)

• /.well-known/agent-card.json — Google A2A AgentCard

• /.well-known/mcp.json — MCP server manifest

• /.well-known/ai-plugin.json — OpenAI plugin manifest

• /openapi.yaml — OpenAPI 3.1 spec

• /agent-discovery — human-friendly landing

• /mcp — MCP Streamable HTTP transport (JSON-RPC 2.0)

Quick start

# 1) Probe the 402 envelope:
curl -i -X POST https://fpds-mcp.mtree.workers.dev/v1/contracts/by_vendor \
  -H 'content-type: application/json' \
  -d '{"vendor":"Lockheed Martin","limit":10}'

# 2) Settle X-PAYMENT (USDC on Base, payTo as advertised) and retry.

Sibling service

For live SAM.gov opportunities + USASpending.gov awards see procure-mcp.

Run locally

npm install
npx wrangler dev

Set PAY_TO_ADDRESS (and optional CDP/facilitator credentials) via wrangler secret put before wrangler deploy.

License

MIT — Money Tree.