Plans and cycles
Commercial plan names are preserved in both languages. The cycle is tied to plan activation (account creation for Gratis), not necessarily the first day of the month. Use
X-RateLimit-Reset for the next reset and check current pricing.
What counts towards quota
On metered routes, successful responses and validation or resource errors such as400, 404, 406 and 422 count. 401, 402, 403, 429 and 5xx do not. One bulk call costs one unit, even with 50 amounts. Webhook deliveries use a separate counter.
Headers
Not all responses pass through the limiter: tolerate missing headers, especially for authentication rejections or proxy errors. HTTP also permits dates in
Retry-After; a general-purpose client should support them.
Handle 429 by scope
burst: wait at least the indicated duration, add jitter and bound attempts and total time. Reduce concurrency.monthly: stop calls until reset or a confirmed quota change. An immediate retry does not resolve exhaustion.- No scope: may be IP protection or the bulk hourly limit. Honour
Retry-Afterand avoid indiscriminate automatic retries.