TLDR;
Every reputable Nostr pubkey (+100K) receives 100 free nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyv9kh2uewd9hj7qghwaehxw309aex2mrp0yhxummnw3ezucnpdejz7qpqkpt95rv4q3mcz8e4lamwtxq7men6jprf49l7asfac9lnv2gda0lqpsy38p credits every day.
In your app, users sign job requests with their own key and send them to our relay. It's that simple!
No need to manage secrets, no need for backends.