> ## Documentation Index
> Fetch the complete documentation index at: https://docs.auriko.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# no_provider_available

> HTTP 503 — No provider can serve this request right now.

## HTTP status

`503 api_error`

## Typical cause

All providers capable of serving the requested model are temporarily unavailable (e.g., all are rate-limited, down, or have no valid key candidates). This is a transient condition — distinct from capability or constraint mismatches, which return specific 400-level codes.

## Resolution

Retry with exponential backoff, honoring the `Retry-After` header if present.