# x402 Discovery MCP

> Use this tool when you need to discover and rank x402 payment-gated APIs based on their capabilities, prices, and trustworthiness, as measured by ERC-8004. It solves the problem of finding reliable and cost-effective APIs for USDC transactions on the Base network. The tool takes in API capabilities and trust metrics as inputs and outputs a ranked list of suitable APIs.

Canonical page: https://skillsregistry.net/skills/io-github-rplryan-x402-discovery-mcp  
JSON: https://api.skillsregistry.net/v1/skills/io-github-rplryan-x402-discovery-mcp

## Description

Discover x402 APIs by capability, price & trust. Powered by x402Scout.

## Trust

- **Trust score (0–1):** 0.66
- **Verification tier:** scanned
- **Last scanned:** 2026-09-19

## Facts

- **Version:** 1.0.0-demo
- **Skill type:** atomic
- **Execution layer:** mcp-remote
- **Runtime environment:** api
- **Category:** other
- **Updated:** 2026-09-19

## Source

- **Source listing:** [MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/io.github.rplryan%2Fx402-discovery-mcp)
- **Repository:** <https://github.com/rplryan/x402-discovery-mcp>

## Use it

MCP endpoint published by the skill: `https://x402-scout-relay.onrender.com/sse`

Resolve this record through the SkillsRegistry MCP server (no auth, read-only):

```
claude mcp add --transport http --scope user skillsregistry https://api.skillsregistry.net/mcp
```

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_skill",
    "arguments": {
      "slug": "io-github-rplryan-x402-discovery-mcp"
    }
  }
}
```

REST: `GET https://api.skillsregistry.net/v1/skills/io-github-rplryan-x402-discovery-mcp` · pull for local use: `GET https://api.skillsregistry.net/v1/skills/io-github-rplryan-x402-discovery-mcp/pull`

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SkillsRegistry indexes agent skills from public registries and GitHub. Skills we have analysed are scanned with Circle-IR and scored on six dimensions; each listing states its scan coverage. More: https://skillsregistry.net/llms.txt