# x402 Verified Catalog + Spot-Check

- Skips page (free): https://verified-catalog-lookup.withgrokbot.workers.dev/v1/skips (JSON: https://verified-catalog-lookup.withgrokbot.workers.dev/v1/skips.json). 500 self-checked x402 endpoints; the skip list shows which ones disagree with their listing.
- All receipts: https://verified-catalog-lookup.withgrokbot.workers.dev/v1/receipts
- Check before you pay: GET https://verified-catalog-lookup.withgrokbot.workers.dev/v1/products/endpoint-spot-check?url=https://example.com/api/paid returns pay|skip|recheck. 1 free/day, then $0.01 to $0.25 USDC (one tenth of the target's quoted price) on Base via x402.
- OpenAPI: https://verified-catalog-lookup.withgrokbot.workers.dev/openapi.json  MCP: https://verified-catalog-lookup.withgrokbot.workers.dev/mcp