“it is a credit based model so you just pay for credits and then use them there's no subscription so right now we have 600 people who have paid but aren't necessarily paying on a regular basis... I have maybe like 12 who pay for the majority of that MRR”

Credit-based pricing lets a dozen power users drive most of your MRR

Adrian deliberately chose a credit/pay-as-you-go model instead of a recurring subscription, which lowered the barrier for developers to try the API. The real discovery was that roughly 12 heavy users drive the vast majority of $20K MRR, meaning the pricing structure naturally self-selects high-volume customers who scale their usage without needing plan upgrades or sales intervention.