yes but where i find the list of all id or where can i find the id of an a event for exmple ufc 299 what is its id?

Hello,
To make a search you can use names and slugs.
You can find the events IDs using categories tournaments and tournaments events endpoints.
The steps you can use to find it:
1 - Choose a category from the /api/mma/categories endpoint
2 - Choose an unique tournament from the /api/mma/category/{categoryId}/unique-tournaments endpoint
3 -Choose a main event(tournament) from https://mmaapi.p.rapidapi.com/api/mma/unique-tournament/{id}/main-events/last/{page} or https://mmaapi.p.rapidapi.com/api/mma/unique-tournament/{id}/main-events/next/{page} endpoint
4 -Finally choose an id from /api/mma/unique-tournament/{id}/tournament/{tournamentid}/mma-events/all endpoint

Thanks.