# x402 MCP Starter

> Free self-hosted x402 USDC billing for Cloudflare MCP servers, with a Base Sepolia test endpoint.

- name: io.github.kadopi/x402-mcp-starter
- version: 0.2.0
- connection class: R0 (autonomous)
- trust: 91/100
- quality: 96/100 (strong)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.kadopi%2Fx402-mcp-starter
- tools: https://api.protogrid.dev/v1/servers/io.github.kadopi%2Fx402-mcp-starter/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "x402-mcp-starter": {
      "type": "http",
      "url": "https://x402-mcp-starter.kadopi.workers.dev/mcp"
    }
  }
}
```


## Trust

- hygiene: 100
- liveness: 99
- freshness: 85
- provenance: 80
- drivers: +repository +namespace-matches-repo +reachable +uptime-97% ~updated-45d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 96/100 (strong)

### protocol: 88 (weight 25)

- pass `protocol.modern`: supports 2026-07-28 (server/discover)
- pass `protocol.stateless`: answers without a session
- pass `protocol.transport`: streamable HTTP
- warn `protocol.list_ttl`: tools/list declares ttlMs 0, so clients re-fetch it on every use

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 100 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 2 of 2 tools declare readOnlyHint or destructiveHint
- pass `tools.directory_hints`: every tool declares readOnlyHint, destructiveHint, idempotentHint and openWorldHint
- pass `tools.token_cost`: about 244 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: no tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 2, about 244 tokens to load them all
- tool set hash: c010fb455e75eeae09b9a6c6133acbd0
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.kadopi/x402-mcp-starter.svg)](https://protogrid.dev/servers/io.github.kadopi/x402-mcp-starter)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://x402-mcp-starter.kadopi.workers.dev/mcp (streamable-http, auth none, reachable true, uptime30d 0.9741379)

## Packages

_none_

## Tools (2)

- `get_paid_sample`: Fixed-price reference path: confirms that an x402-aware MCP client can pay and receive a receipt.
- `validate_x402_config`: Free: checks Base USDC, price, amount, recipient, and facilitator settings before you deploy an x402-paid MCP tool.