Hey, thanks for the feedback, i will make sure to make it more visible/less confusing. So the model is actually quite simple.

1 credit - 1 file up to 15 functions. <-- only this tier is available in alpha, due to current limitations in the implementation, i tried generating on bigger files and it took quite a long time, so i am in the workings on solving this issue before enabling larger files support.

2 credits - 1 file up to 30 functions. 3 credits - 1 file 30-35 functions.

P.s if generated tests have <70% pass rate (at which point probably something went horribly wrong, your credits are refunded)

Hope this answer clears things up!