Payments & Billing APIs
Charge cards, run subscriptions and handle checkout. 6 listed: 0 completely free, 0 usable without an API key.
Stripe API
Payments, subscriptions, invoicing and payouts with excellent developer tooling.
PayPal REST APIs
Checkout, payouts, subscriptions and invoicing through PayPal.
Square API
Payments, point of sale, catalog and customer management for in-person and online sellers.
Lemon Squeezy API
Merchant-of-record checkout, subscriptions and license keys for digital products.
Paddle API
Merchant-of-record billing for SaaS, handling global tax and subscriptions.
Adyen API
Enterprise payment processing across online, mobile and in-store channels.
Comparing payments & billing APIs
| API | Auth | Pricing model | Docs |
|---|---|---|---|
| Stripe API | API key | Paid | docs.stripe.com |
| PayPal REST APIs | OAuth | Paid | developer.paypal.com |
| Square API | OAuth | Paid | developer.squareup.com |
| Lemon Squeezy API | API key | Paid | docs.lemonsqueezy.com |
| Paddle API | API key | Paid | developer.paddle.com |
| Adyen API | API key | Paid | docs.adyen.com |
Not sure which to pick? Read our 12-point API checklist and guide to API pricing models.