> ## Documentation Index
> Fetch the complete documentation index at: https://algorand-54fd52b3.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Errors

> Status codes and error codes.

```json theme={null}
{ "error": { "code": "model_not_found", "message": "Unknown model 'gpt-9'." } }
```

| Status | Codes | Charged |
| - | - | - |
| 400 | `validation_error`, `invalid_json`, `invalid_mandate` | No |
| 401 | `invalid_signature`, `unauthorized` | No |
| 402 | none (challenge), `invalid_payload`, `duplicate_payment_in_flight`, `payer_exposure_limit`, `mandate_not_active`, `mandate_owner_mismatch`, `mandate_model_not_allowed`, `mandate_daily_cap_exceeded` | No |
| 404 | `model_not_found`, `job_not_found`, `job_not_ready`, `receipt_not_found`, `mandate_not_found`, `listing_not_found`, `not_found` | No |
| 409 | `payment_already_used`, `slug_taken`, `mandate_revoked` | Already paid once; no second charge |
| 413 | `body_too_large` | No |
| 429 | `rate_limited` | No |
| 502 | `upstream_error`, `creator_unreachable`, `creator_error` | No, or refunded |
| 503 | `model_unavailable`, `facilitator_unavailable`, `algod_unavailable` | No |

For what to do about each one, see [Handle errors](https://algorand-54fd52b3.mintlify.site/guides/handle-errors.md).


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