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Four steps: create an account, generate a key, make a call, check your balance. The call GET /v2/user/handle/frankdegods returns 200 OK for 0 CU, because sample handles are free
1

Create an account

Sign up at partner.fomoscan.sh/signup with Google or an email address, then confirm the code we email you. Verifying the email activates your free credits.
2

Generate your API key

On the dashboard, select Generate your API key. Copy it right away: the portal shows the full key once. Keys look like fsk_live_….
3

Make a call

The answer is the user record, with fields such as:
A free key reveals wallets for the sample set only, and those lookups cost no credits. Handles: frankdegods, unipcs, pointfarmcap, orangie, theveeman. Any other wallet returns 403 SAMPLE_SET_ONLY until you pick a plan.
4

Check your balance

GET /v2/me is free and returns your plan, remaining units and rate limit.
When the free credits run out, pick a plan or buy a credit pack in the portal. See Credits and pricing.