Subscription and recurring-billing businesses

No. The cap is written into the mandate the subscriber signs, and the contract will not release more than that in a cycle. Raising a price means asking them to sign a new mandate, not editing a number on your side.

Every mandate carries an expiry date, so it ends on its own rather than renewing until someone cancels. A subscriber can also revoke it from their own wallet at any time, without contacting your support.

They don't need one. Gas is on us, so a subscriber with only USDT or USDC in their wallet can sign and pay — which removes the failure that otherwise stops most first-time stablecoin subscriptions.

Yes. Charge the fixed plan on the recurring mandate and settle the variable part each cycle as a separate charge, so usage-based tiers don't need a second billing system.