Not sure what you are looking for as far as API, but maybe you can check this out: https://www.thesportsdb.com/api.php
Google search will bring up thousands of this kind of sites to chose. With the keyword sportsbook api providers I got following results on the first page.https://rapidapi.com/collection/sports-odds-betting-apis
https://nuxgame.com/solutions/seamless-wallet-api
https://oddsmatrix.com/
https://www.gammastack.com/sports-betting-3rd-party-api-integrations/
https://www.programmableweb.com/news/10-most-popular-gambling-apis/brief/2019/11/29
https://www.lsports.eu/oddservice/
https://www.orioninfosolutions.com/blog/best-sports-betting-api-provider-in-india
https://uplatform.com/news/choosing-a-sportsbook-api-why-and-which
https://www.webodoctor.com/blog/take-a-glimpse-on-the-best-sports-betting-api-providers-in-india
I am not endorsing anyone but it's easy to find and research. OP can do his own search on the web.
Thank you!