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I have found information regarding a 5MB limit when my Appian application uses an Integration Object to call another API hosted on an external system.
However, if my Appian application is exposing a WebAPI, so that an external system can make a GET request to my Appian application, is there a size limit on the JSON payload that my Appian WebAPI can return to that external system?
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No official size limit on Web API GET JSON responses, but use pagination to stay under practical memory/timeout constraints (~10MB recommended).URL length limits GET params (~8K chars); switch to POST for larger payloads.
With data volumes growing every day, you will have to implement paging and a page size limits anyways.