There is a complete REST API available in the RaceMeter web interface, which is also used in the user web interface. The structure of this API and a description of each service can be obtained at:
https://racemeter.xyz/api/v2/
The individual services/methods are grouped by the entity they belong to. So for example all methods working with racers are in the racers group. And there is also, for example, the $metadata method, which returns the current structure of the racer entity.
But even for calling API functions, authorization is required. In the case of API function calls, the name and password are not used, but the so-called API KEY. This can be obtained (for the selected user) in the Users agenda.