# REST API calls The REST API enables direct access to the iCure data, while maintaining the encryption perimeter, to achieve connection with eHealth services or other EHRs and custom Apps. In the following categories, detailed description of the API calls to query or modify data in the iCure Database. The REST API is necessitated for use with the [Mobile/Web SDKs](/icure/icure-data-stack/mobile-web-sdks.md), as they are necessary for the decryption of the relevant information. --- # 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://icure.gitbook.io/icure/icure-data-stack/rest-api-calls.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.