Grok’s paid plans start at $20/month for up to 10 prompts every 2 hours, with...

https://wiki-global.win/index.php/How_Much_Does_X_Search_Cost_on_the_Grok_API%3F

Grok’s paid plans start at $20/month for up to 10 prompts every 2 hours, with an option at $50/month for higher usage. There’s no free trial, so you’ll pay from day one