# Call Throttling As adoption of AB Connect increases, We need to ensure all partners have an optimal integration experience. In order to achieve this goal, API controls limit call frequency and payload sizes. Payload sizes have been constrained with a cap on the `limit` for a page (see [Paging Data](/services/ab-connect/introduction/paging.md) for details on payload constraints). The remainder of this section describes call throttling also known as rate limiting. To ensure one client can not adversely affect another client's system performance rate limiting has been implemented on a per account basis. The rate limiting uses a [token bucket model backed by Amazon's API Gateway](https://aws.amazon.com/blogs/aws/new-usage-plans-for-amazon-api-gateway/). In summary, each account has a bucket. The system adds 5 tokens to an account's bucket every second and the bucket can hold up to 25 tokens. Each API call an account makes removes one token from the bucket. If you have not made any calls for a period of time and your bucket is full, you can make a burst of up to 25 calls. However, once your bucket is empty, you'll need to wait before making another call or you'll receive an HTTP 429 response. Some accounts may have different limits and it is possible that these thresholds change over time, so it is recommended that implementation of a client-side throttling solution that is either self-adjusting or is easy to adjust manually. Depending on the client side architecture and implementation language, there may be client side throttling frameworks available that handle the complexity for your system. If you have a particular need for a larger bucket size or bucket fill rate, contact [AB Support](mailto:absupport@instructure.com?subject=AB%20Connect%20Token%20Bucket) for additional plans. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://developerdocs.instructure.com/services/ab-connect/introduction/throttling.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.