Grok offers two paid plans starting at $20/month for basic access and $50/month...

https://charlie-wiki.win/index.php/What_Do_You_Get_with_SuperGrok_Lite_$10_a_Month%3F

Grok offers two paid plans starting at $20/month for basic access and $50/month for advanced features. Both limit users to about 10 prompts every 2 hours. There’s no free trial, so you’ll need to commit upfront to test the service