Usage is measured in credits, an abstract unit. How many you have depends on your plan:
Free: a one-time grant that never renews.
Starter: a monthly allotment that resets each billing cycle.
Enterprise: custom grants.
See Plans.
Each verification costs a fixed number of credits, decided by the product and set when the session is created (not at completion):
Pre KYC
25
Age Verification
10
Proof of Human
10
The dashboard shows the cost when you configure a product. A session is charged its cost at creation, and an in-flight session keeps the price it was created with. To estimate spend, multiply your expected verifications by the product's cost.
You're billed for verifications that finish, not for sessions the user abandons:
valid
Yes
invalid (a rule failed)
Yes
error (technical failure)
No
expired (never completed)
No
By default Self uses a hard credit gate: if your balance can't cover a session's cost, sessions.create(...) is rejected with HTTP 402 (the SDK throws SelfApiError with statusCode: 402, and details carries balance, required, and planTier). The session is not created.
To add capacity, upgrade your plan from Manage plan (or talk to sales about Enterprise). Watch the credits meter on the Settings → Usage & Billing tab so this doesn't surprise you.
Test verifications (sessions created with an sk_test_ key) never consume credits. Use test freely.
Plans: what each tier includes.
Dashboard: Billing: the Usage & Billing tab.
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