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openfang-rail

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Deterministic identifier validation + rental due-diligence, paid per call via x402 (USDC on Base). 19 tools, MCP + REST, signed receipts, dynamic pricing.

openfang-rail

Deterministic business-identity validation (IBAN, LEI, VAT, UK company number) and rental due-diligence checks, paid per call via x402 — gasless EIP-3009 USDC on Base. Non-custodial, no accounts, no API keys: agents pay directly from their wallets, and every result carries a signed, offline-verifiable XDR-1 receipt.

Live endpoint: https://rail.akrivis.in · 28 tools · first N calls/day free, then from $0.000999/call (dynamic — idle prices decay toward the floor, demand bumps them; live quotes at /health).

Endpoints

Path What it is
POST /mcp MCP server (JSON-RPC 2.0: initialize, tools/list, tools/call)
POST /v1/tools/{tool}/call REST entry point, body {"input": { ... }}
GET /.well-known/x402.json x402 discovery (resources, prices, example inputs)
GET /.well-known/mcp.json MCP discovery (tool schemas, receipt signer)
GET /.well-known/agent.json A2A agent card
GET /health live quotes + tool count
GET /playground browser form: try any tool on the free tier
GET /leaderboard, GET /profile/{address} buyer stats (on-chain identity only — no signups)

Quickstart (HTTP)

# free tier — no payment needed
curl -s https://rail.akrivis.in/v1/tools/iban-check/call \
  -H 'content-type: application/json' \
  -d '{"input":{"iban":"GB82WEST12345698765432"}}'

When the free tier is exhausted the API answers 402 with a payment challenge (EIP-3009 TransferWithAuthorization for USDC on Base). Sign the voucher with your wallet, retry with the payment header, and the response includes the settlement result plus a signed receipt. Any x402 client library handles this dance; the canonical flow is documented at the x402 protocol.

Quickstart (stdio / Docker)

The rail is a hosted HTTP MCP endpoint. mcp-bridge.mjs is a zero-dependency stdio↔HTTP bridge for hosts that only speak MCP over stdio (Glama, Docker MCP Toolkit, desktop client configs):

docker build -t openfang-rail .
docker run -i --rm openfang-rail

{
  "mcpServers": {
    "openfang-rail": {
      "command": "docker",
      "args": ["run", "-i", "--rm", "openfang-rail"]
    }
  }
}

The container holds no secrets and no local state — it proxies protocol traffic to the hosted endpoint, whose free tier applies. Point it elsewhere with MCP_ENDPOINT.

Receipts

Every tool result carries an XDR-1 receipt: a canonical, keccak-hashed field set signed by the rail's key (published in /.well-known/mcp.json). Anyone can verify a receipt offline — no trust in the server needed after the fact. See worker/RECEIPTS.md.

Repository layout

  • worker/ — the Cloudflare Worker serving the API, MCP endpoint, discovery files, console and playground (worker/src/), plus QA harness (qa.mjs, qa_live.mjs) and a red-team suite (worker/redteam/)
  • engine/ — Rust (workers-rs) compute plane: batch XDR-1 receipt verification (/verify-batch), key recovery, and a measured benchmark endpoint; deployed via GitHub Actions
  • well-known/ — the discovery documents served at /.well-known/*

License

MIT

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