What is API Quota?
Turkish: API Kotası
An API quota limits the total calls, data volume, or operations a customer, application, or key may use within a defined period.
What is an API Quota?
An API quota is the total usage allowance assigned to a customer, application, API key, or subscription plan. It is usually calculated per day, month, or billing period and may be measured by request count, data volume, operation count, or credits.
Quota and rate limit are related but different. A quota defines how much usage is available across a period. A rate limit controls request speed in a short time window. A customer may have 100,000 calls per month but still be limited to 20 requests per second.
How It Is Managed
- Usage counters are tracked by customer, plan, endpoint, or API key.
- Responses can include remaining quota and reset time in headers.
- When quota is exceeded, the API may return
429or trigger an upgrade/payment flow. - Expensive internal endpoints may have separate quota rules.
Business Use
Rate limiting protects service health, while API quota supports pricing and cost control. Free trials, developer plans, enterprise plans, and overage billing are often built on quota rules.
An API Gateway can centralize quota enforcement, but counters must remain consistent in distributed environments. In multi-region systems, delayed counter updates or race conditions can produce incorrect quota decisions.