x402-api-catalog.onrender.com publishes 5 machine-payable endpoints over the x402 protocol, priced from $0.02 to $1.0 per call. Each was probed directly; the response code below is what it returned.
| Endpoint | Method | Price | Probe |
|---|---|---|---|
| /api/contract-check | GET | $0.05 | 402 |
| /api/domain-check | GET | $0.02 | 402 |
| /api/mcp-audit | GET | $0.06 | 402 |
| /api/trust-check | GET | $0.02 | 402 |
| /api/x402-doctor | GET | $1.0 | 402 |
EVM token contract safety check: honeypot detection, mint/blacklist/pausable/self-destruct capability, ownership renouncement, transfer tax, and a real token-impersonation check (does the symbol claim…
Domain liveness check / verify / audit: DNS resolution (A/MX/NS/TXT records), whether mail routing exists, HTTP reachability.
MCP server safety audit: completes a real initialize+tools/list handshake, then statically scans every tool's name/description/schema for hidden unicode (tool-poisoning), prompt-injection-style phrasi…
npm package trust check / risk score / security audit: registry age, weekly downloads, GitHub org/stars, OSV.dev vulnerabilities, typosquat detection.
Audits another x402 service for the exact failure modes that cause aggregators (agent-tools.cloud, x402scan, Bazaar) to mark it 'down' or make its 402 challenge unreadable: missing/invalid /.well-know…