# Execute API Each Spark service can be called to perform calculations by calling the Execute API. The [API Tester](/navigation/api-tester.md) is the user interface to test the Execute API. * The [Execute API (v3)](/spark-apis/execute-api/execute-api-v3.md) specification of the Execute API is the version that is currently being used in the [API Tester](/navigation/api-tester.md). * The [Execute API (v4)](/spark-apis/execute-api/execute-api-v4.md) specification of the Execute API supports synchronous batching enabling multiple requests to be submitted at the same time. This API specification also forms the basis for using the [Batch APIs](/spark-apis/batch-apis.md) and [Introduction to XConnector](/xconnector/introduction-to-xconnector.md). --- # 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://docs.coherent.global/spark-apis/execute-api.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.