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x402 Precheck MCP Server

by workers-w0arvg81zlgf-x402-precheck Your server? Claim it
answering

x402 Precheck is answering right now. Last checked 12 min ago. It exposes 1 tools.

Check an x402 payment challenge before your agent pays: network, USDC, amount, payTo, facilitator.

Uptime history 20 hours of history
20 hours agonow
100.0%
Uptime 24h
72 of 72 checks
1
Tools
read from the server
215 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

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

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

run in your terminal
claude mcp add precheck --transport http https://x402-precheck.w0arvg81zlgf.workers.dev/mcp
Settings → Connectors → Add custom connector, then paste this address
https://x402-precheck.w0arvg81zlgf.workers.dev/mcp
~/.codex/config.toml
[mcp_servers.precheck]
url = "https://x402-precheck.w0arvg81zlgf.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "precheck": {
      "url": "https://x402-precheck.w0arvg81zlgf.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "precheck": {
      "type": "http",
      "url": "https://x402-precheck.w0arvg81zlgf.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
x402_precheck
Check an x402 payment challenge BEFORE your agent pays (0.002 USDC per check via x402; free trial 1024 checks/IP/UTC day). Give an endpoint URL (fetched unpaid, never paid) or paste a 402 challenge. Validates x402 version, scheme, network (CAIP-2, testnet flag), canonical USDC asset, amount sanity, payTo format/EIP-55 checksum/zero address, EIP-712 domain, payment window, facilitator reachability and scheme/network support, optional maxPriceUsd / expectPayTo / expectNetwork policy, and PayAI Bazaar listing match. Returns per-check pass/warn/fail and a verdict: looks_ok, review or do_not_pay. Informational; invalid input and failed checks are not charged.

Endpoints

URLTransportStateLatencyChecked
https://x402-precheck.w0arvg81zlgf.workers.dev/mcp streamable-http answering 260 ms 12 min ago

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Verantis MCP
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Hosannaith MCP
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Check x402 endpoint reliability on Algorand before an agent routes a payment there.

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x402 Merchant Check
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Pre-payment merchant trust checks for x402 agents on Base and Solana.

1 tools answering

x402 Precheck — questions

Answers built from our own checks of this server.

What can x402 Precheck do?
It exposes 1 tools, read directly from the server on our last check. Among them: x402_precheck. 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 Precheck working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 72 of 72 checks got a reply (100.0%), average response time 215 ms. The bar chart above shows every period we have measured.
How do I connect x402 Precheck?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does x402 Precheck need an API key?
No. x402 Precheck 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 Precheck?
It answers our handshake in 215 ms on average, which is faster than 63% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.