x402 Preflight is answering right now. Last checked 7 min ago. It exposes 3 tools. Last commit 5 Nov 2026.
Check an x402 endpoint's payment challenge and discovery metadata before paying.
What changed 3
Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 2 October 2026. No other catalogue keeps this.
x402 Preflight does not always answer
Over the last week it answered 14.8% 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 7 min ago.
claude mcp add x402-preflight --transport http https://x402-wallet-readiness-service.vercel.app/mcphttps://x402-wallet-readiness-service.vercel.app/mcp[mcp_servers.x402-preflight]
url = "https://x402-wallet-readiness-service.vercel.app/mcp"{
"mcpServers": {
"x402-preflight": {
"url": "https://x402-wallet-readiness-service.vercel.app/mcp"
}
}
}{
"servers": {
"x402-preflight": {
"type": "http",
"url": "https://x402-wallet-readiness-service.vercel.app/mcp"
}
}
}This endpoint answered with an authorization challenge. The server is running, but it did not say what kind of credentials it expects.
This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.
Available tools 3
Read directly from the server with tools/list, grouped by what they act on.
If a tool disappears, we record the date.
audit_x402_endpoint
inspect_x402_endpoint
order_x402_remediation
Endpoints
| URL | Transport | State | Latency | Checked |
|---|---|---|---|---|
| https://x402-wallet-readiness-service.vercel.app/mcp | streamable-http | needs auth | 79 ms | 7 min ago |
| https://x402.chikocorp.com/mcp | streamable-http | answering | 102 ms | 7 min ago |
Alternatives to x402 Preflight
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x402 Preflight — questions
Answers built from our own checks of this server.