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The SureCart API uses a number of safeguards against bursts of incoming traffic to help maximize its stability. If you send many requests in quick succession, you might see error responses with status code 429.

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API Limiters

We have several limiters in the API, including a rate limiter and a concurrency limiter. Treat the limits as maximums, and don’t generate unnecessary load. To prevent abuse, we might reduce the limits. You can request a limit increase to enable a high-traffic application by contacting SureCart Support.

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Rate Limits

The basic rate limiter restricts the number of API requests as follows: Default Limit: 150 operations / 10 seconds Sensitive Endpoints: 10 operations / 1 minute Public Endpoints: 60 operations / 1 minute Sensitive endpoints include those that may trigger notifications or call third-party services. In general, these are endpoints that should not be called frequently. Public endpoints are those that are accessible with a public API key. For example, our license check endpoint.