Stripe handles all card data.
We never see your card number. Card-on-file is required from day one
(anti-abuse).
Metered overage.
Past your monthly quota, you're billed per-call at the overage rate.
Stripe invoices monthly. Cancel or downgrade anytime via the Customer
Portal.
Same tier = same features.
All 79 calculators + MCP server are available on Free. Tier
differences are only quota + RPM + overage rates.
No commit term.
Monthly subscriptions. Annual discount available on Starter / Growth
(10% off — contact us).