grok接cpa还是sub2api，哪个更好用

sub2api 好像用不了 我注册了几个都提示

Grok Responses API returned 402: {“code”:“personal-team-blocked:spending-limit”,“error”:“You have run out of credits or need a Grok subscription. Add credits at https://grok.com/?_s=usage or upgrade at https://grok.com/supergrok.”}