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Fetch usage/cost stats for a completed request by its id (the id returned in a chat completion). Useful for auditing or fetching cost asynchronously. Free. Mirrors OpenRouter’s generation endpoint.
​
id
string
required
The generation id from a prior chat completion response.
curl "https://api.usenaive.ai/v1/llm/generation?id=gen-xxxxxxxx" \
  -H "Authorization: Bearer nv_sk_live_..."

{
  "data": {
    "id": "gen-xxxxxxxx",
    "model": "anthropic/claude-sonnet-4.6",
    "total_cost": 0.00012,
    "tokens_prompt": 14,
    "tokens_completion": 16,
    "native_tokens_prompt": 14,
    "native_tokens_completion": 16
  }
}
Cost: Free.
Stats are populated by OpenRouter after a generation finishes accounting, so a lookup immediately after a completion may briefly return provider_error (404) until the record is available. For real-time cost you don’t need this endpoint — every chat completion already returns usage.cost (and Naive credits_used) inline.