Leni HTTP API

Usage, billing, and limits

The project key determines environment, quota, rate limits, and billing. Sandbox and production use the same HTTPS base URL.

Key environment	Per-key limit	Usage behavior
Sandbox	5 requests per 60 seconds	Default allowance is 100 successful calls per calendar month (UTC); the key response is authoritative.
Production	120 requests per 60 seconds	Metered analysis consumes included subscription credit first, then funded API credits when available. Non-analysis reads still count toward rate limits.

Current pricing

Exact rates, available credits, and spending controls are shown in the authenticated Leni account. Integrations should not hard-code a dollar balance or model price.

Rate-limit response

HTTP/1.1 429 Too Many Requests
Retry-After: 42

{
  "error": "RATE_LIMIT_EXCEEDED",
  "limit": 5,
  "windowSeconds": 60,
  "retryAfterSeconds": 42,
  "environment": "sandbox"
}

Sandbox quota

A sandbox request is decremented only after a successful 2xx or 3xx response. Failed 4xx or 5xx requests do not consume the reserved call. The allowance resets lazily at the first request after 00:00 UTC on the first day of the next calendar month.

HTTP/1.1 402 Payment Required

{
  "error": "SANDBOX_LIMIT_EXCEEDED",
  "message": "Sandbox API call quota exhausted for this key.",
  "sandboxLimit": 0,
  "sandboxLimitResetAt": "<ISO-8601 timestamp>",
  "environment": "sandbox"
}