preflight402 MCP Server

by ironshell Your server? Claim it

not responding

preflight402 is listed as active in the registry but did not answer our last check. It exposes 1 tools. Last commit 5 Aug 2026.

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

Uptime history 51 days of history · worst day 0%

51 days agonow

15.4%

Uptime 24h

14 of 91 checks

Tools

read from the server

1112 ms

Response time

average over 24h

Stars

last commit 5 Aug 2026

preflight402 does not always answer

Over the last week it answered 23.2% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

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 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

URL	Transport	State	Latency	Checked
https://preflight402.ironshell.io/mcp	streamable-http	answering	97 ms	10 min ago

Alternatives to preflight402

same job, measured the same way

Pulsefeed X402

by nikolife2016

Verify x402 payment endpoints before an AI agent pays: scam scan, on-chain checks, trust scores.

48 installs/wk 11 tools answering

Attest

by attestagents

Scan agent payment endpoints (x402, AP2, L402, MPP, 402) for a trust grade A-F before paying.

24 installs/wk 2 tools answering

x402 Triage MCP

by tatelyman

MCP server for no-payment x402 surface triage, 402 Index health checks, and paid review handoff.

24 installs/wk local only

x402 Merchant Check

by gradientdecisions

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

1 tools answering

402

by 402

Trust layer for agent payments (x402, Base): verify agents, risk scores, signed escrow verdicts.

37 installs/wk local only

X402lint

by arden-instance

Lint an HTTP endpoint's x402 402 conformance; decode X-PAYMENT blobs; inspect a facilitator.

2 062 installs/wk local only

FOXIFY Agent Payment Preflight

by speeedy10

x402 payment preflight for agents: mandate, amount, destination, merchant, expiry and replay.

2 tools answering

Agentcash

by merit-systems

Generic MCP server for calling x402-protected APIs with automatic payment handling

1 620 installs/wk local only

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 14 of 91 checks got a reply (15.4%), average response time 1112 ms. The bar chart above shows every period we have measured.

The registry lists preflight402 as active — why does it not respond?

The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.

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 1112 ms on average, which is faster than 9% 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.