Errors
All errors return JSON with code, message, and request_id.
| HTTP | code | meaning |
|---|---|---|
| 400 | invalid_request | Body missing url, gtin, or query. |
| 401 | missing_key | No Authorization header. |
| 403 | key_revoked | Key has been revoked or account suspended. |
| 402 | payment_required | x402 flow. See MCP docs. |
| 404 | not_resolvable | Reference could not be resolved with sufficient confidence. |
| 422 | low_confidence | Resolved below 0.7; not cached. |
| 429 | rate_limited | Per-key burst or sustained rate exceeded. |
| 451 | takedown | URL is under a takedown. |
| 500 | internal_error | Something on our side. Includes request_id. |