REST API for information blocks is available from Information blocks module version 20.5.0.
Presently, Read-only mode is available for iblock elements. The following methods for getting and filtering entries are available:
|iblock.element.get||Gets iblock element by its ID.|
|iblock.element.list||Gets iblock element by specified filter.|
Also, custom controller implementation is available: both creating a complete controller and descendant from standard with redefining of required methods.