Mmcp.market

x402 Preflight MCP server

by chico10117·io.github.chico10117/x402-preflight·v1.0.1
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Inspect and validate an x402 endpoint before an autonomous agent spends USDC.

B81/100grade B
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Safety scan
B81/100

full report

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If you have run it, two minutes of your experience saves the next person an afternoon.

x402 Preflight tools (3, 2 write)

write = sends, deletes, buys or posts
  • audit_x402_endpointwrite actionFree

    Purchase a deep, deterministic audit of payment schema, discovery metadata, redirects, CORS, cache, and operational signals. Returns HTTP 402 until the MCP client supplies a valid payment for this call.

  • inspect_x402_endpointFree

    Call before spending on an unfamiliar x402 resource. Free, read-only, and never sends payment credentials.

  • order_x402_remediationwrite actionFree

    Purchase a durable remediation intake after a failed audit. Creates an order but never deploys, signs, or spends automatically.

Public scan report

scanner v0.1.9 · 2026-09-20 · same rubric, same numbers if you re-run it

1 high
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 1126ms20/20
  • Tool poisoning3 tool descriptions checked15/15
  • Auth qualityopen endpoint exposes 2 write-action tools with no auth3/15
  • Maintenancelast push 5 days ago15/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10

Findings (1)

  • highWrite-action tools reachable without authenticationauth.open-write
Overall 81/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Install directly

claude mcp add --transport http x402-preflight https://x402.chikocorp.com/mcp
Add to Cursor

x402 Preflight: common questions

Is x402 Preflight MCP server safe?
Mostly: it is graded B (81/100). Read the x402 Preflight safety report
How do I install x402 Preflight?
It runs remotely at x402.chikocorp.com. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
Does x402 Preflight need an API key?
Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is x402 Preflight maintained?
The last commit was 6 days ago (2026-09-15). The latest release is v1.0.1.
Is x402 Preflight up?
100% of our last 5 checks got an answer. We check remote servers about four times a day.
What can I use instead of x402 Preflight?
Servers from other publishers that do the same job: runx MCP server, Agent Wormhole MCP server and BridgeNode MCP server. Compare all x402 Preflight alternatives.

Alternatives to x402 Preflight

Same job from other publishers: the closest match first, then the best rated.

All x402 Preflight alternatives →
  • runx
    The governed runtime for agent skills. Search the catalog and inspect a skill before running it.
    A
  • Agent Wormhole
    Check tokens, pages and x402 payments before your agent trusts them. Offline verdicts.
    B
  • BridgeNode MCP
    BridgeNode — x402 pay-per-request AI inference. OpenAI-compatible API + MCP, Solana USDC, gas-free.
    A
  • MCP
    Authorize consequential AI agent actions before execution
    A
  • NVIDIA Elements
    NVIDIA Elements UI design system and agent tools for AI/ML, robotics, and autonomous vehicles.
    A
x402 Preflight vs runxx402 Preflight vs Agent Wormholex402 Preflight vs BridgeNode MCP

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