mcpbeat

preflight402 MCP Server

io.ironshell/preflight402
answering

preflight402 is answering right now. Last checked 7 min ago. It exposes 1 tools. Last commit 30 Jul 2026.

Trust verdict for an x402 payment endpoint: health, 402 handshake, price, proceed/caution/avoid.

Uptime history 41 hours of history · worst hour 0%
41 hours agonow
52.7%
Uptime 24h
48 of 91 checks
1
Tools
read from the server
1010 ms
Response time
average over 24h
0
Stars
last commit 30 Jul 2026

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

run in your terminal
claude mcp add preflight402 --transport http https://preflight402.ironshell.io/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "preflight402": {
      "url": "https://preflight402.ironshell.io/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.preflight402]
url = "https://preflight402.ironshell.io/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "preflight402": {
      "url": "https://preflight402.ironshell.io/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "preflight402": {
      "url": "https://preflight402.ironshell.io/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.

preflight
preflight
One free call before your agent pays. Probes the URL (no wallet, payment, or auth) and returns a trust-preview.v1 verdict: liveness and latency, TLS validity, the 402 payment handshake with protocol detection (x402 v1/v2, MPP-capable), detected networks/asset/price with a USD estimate, ERC-8004 identity binding with Sybil-filtered reputation for the payee (which can adjust the recommendation), and a proceed / caution / avoid recommendation with human-readable reasons. Paid-tier fields (uptime history, reseller analysis) are present but null on the free tier.

Endpoints

URLTransportStateLatencyChecked
https://preflight402.ironshell.io/mcp streamable-http answering 797 ms 7 min ago

preflight402 — questions

Answers built from our own checks of this server.

What can preflight402 do?
It exposes 1 tools, read directly from the server on our last check. Among them: preflight. 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 preflight402 working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 48 of 91 checks got a reply (52.7%), average response time 1010 ms. The bar chart above shows every period we have measured.
How do I connect preflight402?
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 preflight402 need an API key?
No. preflight402 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 preflight402?
It answers our handshake in 1010 ms on average, which is faster than 5% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is preflight402 open source?
Yes — it is published under the MIT licence, written in Python and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.