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26. errors: function rate limit

Last updated on Aug 05, 2025

FUNCTION_RATE_LIMIT

The function you are trying to call has exceeded the rate limit.

Table of Contents

The FUNCTION_RATE_LIMIT error

The FUNCTION_RATE_LIMIT error occurs when the limit of concurrent executions for Serverless Functions has been reached, and the request triggers a new instance of the function, which results in two concurrent functions running at the same time.

For more information see What should I do if I receive a 429 error on Epycbyte?

Troubleshoot

To troubleshoot this error, follow these steps:

Check application logs

Review the application logs to identify any specific errors related to the Serverless Function being invoked. For example, your function might be waiting for a slow backend API without a reasonable timeout.

They can be found at the host URL under the /_logs path

Review deployment configuration

Double-check the deployment configuration to ensure that the Serverless Function is being deployed correctly

Investigate build errors

If the error occurs during the build process, troubleshoot any build errors that might be preventing the necessary resources from being deployed

Check function code

Ensure that the code for the Serverless Function is correct and does not contain any errors or infinite loops

Increase the concurrency limit

If you would like to increase the limit, contact Epycbyte support

What should I do if I receive a 429 error on Epycbyte?

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