x402 MCP Starter
https://x402-mcp-starter.kadopi.workers.dev/mcp ↗
Description
Free self-hosted x402 USDC billing for Cloudflare MCP servers, with a Base Sepolia test endpoint.
What our measurements say
x402 MCP Starter is a remote MCP server published at x402-mcp-starter.kadopi.workers.dev. It has been probed 8 times since 9/12/2026. It answered in 8 of them (100.0%), a near-uninterrupted record. Median response time is 341 ms, placing it among the faster endpoints. It offers a narrow, focused set of 2 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- validate_x402_config has clearly defined required parameters for configuration validation
- Tool names align with their primary functions (validation vs. sample payment)
Weaknesses
- get_paid_sample's 'option' parameter lacks context about valid values
- Descriptions don't specify when tools should be used (only what they do)
- No documentation of error scenarios or validation constraints
- Ambiguous 'asset' parameter in validate_x402_config
validate_x402_config— asset parameter lacks specificity about expected valuesget_paid_sample— option parameter description provides no guidance on valid inputs
Verdict
Event narrative
Sign up free to generateRaw observations
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 43ms → warm 41ms (penalty 2ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
validate_x402_configFree: checks Base USDC, price, amount, recipient, and facilitator settings before you deploy an x402-paid MCP tool.
networkstringrequiredassetstringrequiredamountstringrequiredpriceUsdnumberrequiredpayTostringrequiredfacilitatorUrlstringrequired
get_paid_sampleFixed-price reference path: confirms that an x402-aware MCP client can pay and receive a receipt.
optionstringrequired
Availability history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Added to watch — era: Dual-era
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[](https://mcpmetrics.io/servers/io-github-kadopi-x402-mcp-starter)<a href="https://mcpmetrics.io/servers/io-github-kadopi-x402-mcp-starter"><img src="https://mcpmetrics.io/badge/io.github.kadopi/x402-mcp-starter/era.svg" alt="mcpmetrics"></a>You are seeing the last 7 days. Sign up for the full history. Which check failed and why is in the dashboard.
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