Marketplace · API · x402

x402-doctor.fizzl.eu/api/v1/diagnose

Why is my x402 endpoint broken? Diagnose and debug an x402 payment endpoint (or MCP server) when payments fail: checks the 402 challenge, accepts[] (network, payTo, amount, asset), resource URL, Solana settlement readiness, which wallets and agents can pay, Bazaar/OpenAPI discovery and the browser paywall. Returns every check with a fix hint. Read-only: never pays. Bulk: 1000 credits for $0.80 via /api/v1/credits.

Endpointhttps://x402-doctor.fizzl.eu/api/v1/diagnose
Trust✓ Verified callable · 100% uptime over 1 checks · ~602 ms
PricingPay per call with x402, no account. Call it to get an exact quote before paying.
networkeip155:8453
schemeexact
pay to0x6B0F4651eD42893ab58139938175E4a69f175F25
methodGET
last updated2026-10-27T10:16:26.106Z

Use it

Call it (an x402 client pays automatically)

curl -i https://x402-doctor.fizzl.eu/api/v1/diagnose
# 402 reply -> sign PAYMENT-REQUIRED with an x402 client (e.g. @x402/fetch) -> retry with PAYMENT-SIGNATURE

This listing as JSON

curl https://aipaygen.com/v1/catalog/api/x402-d25beb127b257ed5

Search the whole marketplace from your agent (MCP)

{
  "mcpServers": {
    "aipaygen": {
      "url": "https://aipaygen.com/mcp"
    }
  }
}

Related