x402 Service Discovery

Discovers x402-payable APIs at runtime.

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What it can do

  • X402 Discover: Discover x402-payable services matching a query. Returns matching endpoints with quality signals (uptime, latency, payment details). Each query costs $0.005 USDC via x402 protocol.
  • X402 Browse: Browse all registered x402-payable services with optional filtering by category. Returns the full catalog for free — no payment required.
  • X402 Health: Check the health and uptime statistics of a specific x402 service by URL. Free — no payment required.

What data it sees

Do you need an account

No: the server works without sign-in

Discovers x402-payable APIs at runtime. Enables autonomous agents to find, evaluate, and pay for services via USDC micropayments on Base — no API keys or subscriptions required.

How to connect

How to connect x402 Service Discovery to Claude

The server address to paste into Claude settings:

https://rplryan.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect x402 Service Discovery to ChatGPT

The server address to paste into ChatGPT settings:

https://rplryan.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect x402 Service Discovery to Cursor

The server address to paste into Cursor settings:

https://rplryan.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (5)

Raw names from tools/list. Only developers need these.

x402_discoverDiscover x402-payable services matching a query. Returns matching endpoints with quality signals (uptime, latency, payment details). Each query costs $0.005 USDC via x402 protocol.
x402_browseBrowse all registered x402-payable services with optional filtering by category. Returns the full catalog for free — no payment required.
x402_healthCheck the health and uptime statistics of a specific x402 service by URL. Free — no payment required.
x402_trustGet the ERC-8004 on-chain trust profile for a service or wallet. Returns identity verification, reputation score, and third-party attestations. Free — no payment required.
x402_registerRegister a new x402-payable service in the discovery catalog. Free to register — no payment required.