Free trials are given per account. Accounts are free to make. See your worst-case bill, then cap it per device, for free.
How much can people farming your free trial cost you before you notice? The green row is the fix: a daily cap per device instead of per account.
The cap saves $0
Already calling models through a gateway? These limits cost nothing. One rule for all of them: for trial users, cap an id bound to the device (an App Attest key id, or an install id your server issues and the app keeps in the Keychain), not the account, or a farmer just makes a new account.
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Everything above is free. If 5 people want it, I'll ship a $9 kit so you don't have to wire it up yourself:
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