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x402-agent-data

by charlie-morrison
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JavaScript
Remote

x402-agent-data

Pay-per-call data tools for AI agents, settled per call in USDC on Base via the x402 protocol. The buyer is another agent: it discovers an endpoint, auto-pays per request (HTTP 402 → payment → data), and gets structured JSON back. No API key, no signup, no account — the seller's only setup is one public wallet address.

Live at https://x402.charliemorrison.dev — also listed as a remote MCP server in the Official MCP Registry as dev.charliemorrison/agent-web-reader.

Tools

Tool

Endpoint

Price

Returns

market_signal

GET /signal

$0.005

Crypto market signal (price/trend/momentum) for a symbol

web_read

GET /extract

$0.005

Clean, readable text + metadata extracted from any URL

repo_audit

GET /audit?owner=&repo=

$0.005

GitHub repo discoverability/SEO score (0–100) + concrete fixes

Free, unpaid routes:

  • GET / — discovery doc (service + paid-endpoint metadata, x402-aware)

  • GET /healthz — liveness

  • GET /.well-known/mcp.json — MCP discovery manifest

  • GET /.well-known/agent.json — A2A Agent Card

  • POST /mcp — remote MCP server (Streamable HTTP). Lists the three tools; an unpaid tools/call returns the decoded x402 payment-required challenge, and a call carrying an x402 payment returns the data.

Related MCP server: x402farm-mcp

How payment works

  1. Agent calls a paid route with no payment → server responds HTTP 402 with an x402 challenge (amount, asset = USDC, network = base, payTo address).

  2. Agent's x402 client signs a payment authorization and retries with the X-PAYMENT header.

  3. Server verifies/settles via an x402 facilitator and returns the data.

No private key ever lives in this server's config — it only receives. Settlement is delegated to an x402 facilitator (default: a zero-fee, gas-sponsored facilitator; Coinbase CDP facilitator is supported via env and inert unless configured).

Run it

npm install
PAY_TO=0xYourReceivingAddress node server.js   # listens on :4021

Environment:

  • PAY_TO — your receiving wallet (USDC on Base). Required for real revenue.

  • PORT — default 4021.

  • CDP_API_KEY_ID / CDP_API_KEY_SECRET — optional; switches settlement to the Coinbase CDP facilitator. Omitted by default.

Why this shape

The buyer is a machine and distribution is a registry — there's no cold human audience to recruit, which is the wall that kills most indie API/tool launches. Seller setup is a single wallet address; every call is zero-marginal-cost public data.

License

MIT

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivityInactive
ResponsivenessNo issues

Resources

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