Returns the amount actually billed for one request, keyed by the X-Orca-Request-Id header every OrcaRouter response carries. This is the authoritative cost surface: the settled record, read back after the fact.

Scoped to the calling key's owner and workspace — another tenant's id returns 404. The settlement record is written after the response completes, so an immediate lookup can 404; treat that as "not settled yet" and retry briefly.

One request id can cover several upstream attempts; the lookup returns the terminal attempt. A request that never succeeded reports total_cost: 0. Async video / task jobs settle without the request id and are not resolvable here.

Rate limited at 120 requests/minute per user, separately from the relay. See Per-request cost for the full contract.

{
  "data": {
    "id": "20260810120000-abc123",
    "model": "openai/gpt-4o",
    "created_at": 1786360000,
    "token_name": "prod-key",
    "tokens_prompt": 1100,
    "tokens_completion": 420,
    "tokens_total": 1520,
    "total_cost": 0.00123,
    "cost_currency": "USD",
    "quota": 615,
    "latency_ms": 3000,
    "ttft_ms": 210
  }
}