Budgets are per key and per environment. Every response tells you where you stand.
| Environment | Limit | Burst |
|---|---|---|
| Sandbox | 1,000 / day | 10 / second |
| Production · Starter | 100,000 / month | 25 / second |
| Production · Scale | Custom | 200 / second |
X-RateLimit-Limit: 25 X-RateLimit-Remaining: 22 X-RateLimit-Reset: 1757750400 Retry-After: 2
On 429 the Retry-After header is authoritative. SDKs honour it automatically with jitter; if you call the API directly, back off for at least that many seconds.