How credits work
Credits are a single, fungible top-up — every credit is equal.
A scan costs 1 credit per grid point, per keyword, per ranking source. So a 13×13 grid (169 points) with 1 keyword on 1 source = 169 credits; on 2 sources = 338.
Credits never expire and every credit unlocks the same features. Packs differ only by size and price (larger packs are cheaper per credit).
Refunds
If a scan fails, the credits for it are automatically refunded to your wallet.