x402 endpoint checker MCP Server

by workers-soloearn-x402-seller-kit Your server? Claim it

answering

x402 endpoint checker is answering right now. Last checked 10 min ago. It exposes 1 tools.

Test any x402 paid URL without paying: 402, PAYMENT-REQUIRED, USDC, amounts, payTo, EIP-712, CORS.

Uptime history 4 days of history

4 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

56 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check x402 endpoint checker every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add x402-checker --transport http https://x402-seller-kit.soloearn.workers.dev/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "x402-checker": {
      "url": "https://x402-seller-kit.soloearn.workers.dev/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.x402-checker]
url = "https://x402-seller-kit.soloearn.workers.dev/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "x402-checker": {
      "url": "https://x402-seller-kit.soloearn.workers.dev/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "x402-checker": {
      "url": "https://x402-seller-kit.soloearn.workers.dev/mcp"
    }
  }
}

Available tools 1

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

x402

check_x402_endpoint

Fetch a paid URL without paying and grade its x402 402 challenge: status, PAYMENT-REQUIRED header, version, network, USDC asset, amount units, payTo checksum, EIP-712 domain, CORS, HEAD parity and discovery metadata. Read-only; never signs or pays.

Endpoints

URL	Transport	State	Latency	Checked
https://x402-seller-kit.soloearn.workers.dev/mcp	streamable-http	answering	55 ms	10 min ago

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Email Validator

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Validates JSON against a JSON Schema, lists violations. x402 payment required (testnet USDC).

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URL Normalizer

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Normalizes and deduplicates a list of URLs. x402 payment required (testnet USDC, Base Sepolia).

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x402 endpoint checker — questions

Answers built from our own checks of this server.

What can x402 endpoint checker do?

It exposes 1 tools, read directly from the server on our last check. Among them: check_x402_endpoint. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is x402 endpoint checker working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 56 ms. The bar chart above shows every period we have measured.

How do I connect x402 endpoint checker?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does x402 endpoint checker need an API key?

No. x402 endpoint checker completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 1 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is x402 endpoint checker?

It answers our handshake in 56 ms on average, which is faster than 93% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.