APIbenchmarks

Category report · 7 providers evaluated

Best Payments APIs

Payments APIs let developers accept cards, wallets, and local payment methods programmatically. The category splits into best-in-class developer platforms with instant self-serve sandboxes and public per-transaction pricing (Stripe, Square, Razorpay, Mollie), and enterprise acquirers whose APIs are excellent but gated behind sales-led onboarding and quoted interchange++ pricing (Adyen, Checkout.com, Braintree). Compare on documentation/DX, reliability at scale, breadth of official SDKs plus agent/MCP tooling, and how fast a developer (or AI agent) can self-serve a working key with transparent pricing.

Stripe logo
Highest rated
Stripe

Developer-first payments platform

97.5
ABI
A+
VerdictWhat is the best payments API?The short answer, plus which provider wins on each axis.Read the verdict →

What is the best Payments API?

#ProviderDocumentationReliabilityEcosystemAccessibilityABIFree
1Stripe logoStripeStripe9897979897.5A+Yes
2Square logoSquareBlock8686848885.9AYes
3Razorpay logoRazorpayRazorpay8280808882.2BYes
4Mollie logoMollieMollie8480768681.4BYes
5Braintree logoBraintreePayPal8086806277.9BYes
6Checkout.com logoCheckout.comCheckout.com8488765276.6BYes
7Adyen logoAdyenAdyen8495783876.1BNo

Table 1. Best Payments APIs ranked by the APIbenchmarks Index. Specification columns are vendor-stated; ABI is computed per the published methodology.

Composite scores

Stripe
97.5
Square
85.9
Razorpay
82.2
Mollie
81.4
Braintree
77.9
Checkout.com
76.6
Adyen
76.1
Scale 0–100. Highest in category: 97.5.

Figure 1. APIbenchmarks Index for Payments APIs, bar length proportional to composite score; colour encodes letter grade.

Provider scorecards

Stripe logo
1. StripeA+ABI 97.5 · Best in class

The reference-standard payments API: best-in-class docs, SDKs in every major language, official MCP server, and instant self-serve sandbox.

Documentation & DX
98
Reliability
97
Ecosystem & SDKs
97
Accessibility
98
Square logo
2. SquareAABI 85.9 · Excellent

Strong unified online + in-person API with free dev tools, a clean sandbox, and SDKs spanning web, mobile, and POS hardware.

Documentation & DX
86
Reliability
86
Ecosystem & SDKs
84
Accessibility
88
Razorpay logo
3. RazorpayBABI 82.2 · Strong

India's leading developer-friendly gateway with publicly documented APIs, self-serve signup, free tier, and broad SDK/plugin coverage.

Documentation & DX
82
Reliability
80
Ecosystem & SDKs
80
Accessibility
88
Mollie logo
4. MollieBABI 81.4 · Strong

European PSP with a notably clean Payments API, hosted checkout, transparent per-transaction pricing, and self-serve signup.

Documentation & DX
84
Reliability
80
Ecosystem & SDKs
76
Accessibility
86
Braintree logo
5. BraintreeBABI 77.9 · Strong

PayPal-owned gateway with REST + GraphQL APIs, client SDKs for iOS/Android/JS and 6 server languages, plus native PayPal/Venmo support.

Documentation & DX
80
Reliability
86
Ecosystem & SDKs
80
Accessibility
62
Checkout.com logo
6. Checkout.comBABI 76.6 · Strong

Enterprise unified-payments API with strong docs and SDKs, but custom risk-based pricing and sales-gated production access.

Documentation & DX
84
Reliability
88
Ecosystem & SDKs
76
Accessibility
52
Adyen logo
7. AdyenBABI 76.1 · Strong

Enterprise-grade single-platform acquirer with ~99.999% historical uptime, but sales-led onboarding and quoted interchange++ pricing.

Documentation & DX
84
Reliability
95
Ecosystem & SDKs
78
Accessibility
38

Frequently asked questions

What is the best Payments API?
By the APIbenchmarks Index, Stripe rates highest (ABI 97.5, grade A+). Developer-first payments platform The ABI weights documentation, reliability, ecosystem, and accessibility; price is reported separately, so the right pick still depends on your budget and workload.
Which payments APIs have a free tier?
Stripe, Square, Razorpay, Mollie, Braintree, Checkout.com offer a free tier or trial credits.
How is the APIbenchmarks Index calculated?
The ABI is a weighted composite of four dimensions scored on absolute reference scales: documentation & DX (30%), reliability (25%), ecosystem & SDKs (25%), and accessibility (20%). Price is excluded from the composite because price units are not comparable across categories. The full formula is on the methodology page.

Popular comparisons

Stripe vs SquareStripe vs RazorpayStripe vs MollieSquare vs RazorpaySquare vs MollieRazorpay vs Mollie

References

  1. https://stripe.com/pricing
  2. https://docs.stripe.com/sdks
  3. https://docs.stripe.com/api
  4. https://status.stripe.com/
  5. https://engineeringenablement.substack.com/p/designing-stripe-for-black-friday
  6. https://www.g2.com/products/stripe-stripe-payments/reviews
  7. https://www.capterra.com/p/123889/Stripe/reviews/
  8. https://github.com/stripe
  9. https://developer.squareup.com/reference/square/payments-api
  10. https://developer.squareup.com/docs/payments-overview
  11. https://developer.squareup.com/docs/sdks
  12. https://developer.squareup.com/docs/web-payments/overview
  13. https://squareup.com/us/en/payments/our-fees
  14. https://squareup.com/us/en/pricing
  15. https://square2.statuspage.io/
  16. https://www.g2.com/products/square-payments/reviews
  17. https://www.trustpilot.com/review/squareup.com/us
  18. https://razorpay.com/pricing/
  19. https://razorpay.com/blog/razorpay-payment-gateway-pricing-explained/
  20. https://status.razorpay.com/
  21. https://razorpay.com/docs/api/understand/
  22. https://razorpay.com/docs/payments/server-integration/
  23. https://www.g2.com/products/razorpay/reviews
  24. https://www.capterra.com/p/179263/Razorpay/reviews/
  25. https://www.trustpilot.com/review/razorpay.com
  26. https://razorpay.com/blog/magic-checkouts-new-single-page-checkout/
  27. https://www.mollie.com/pricing
  28. https://docs.mollie.com/
  29. https://docs.mollie.com/docs/libraries
  30. https://status.mollie.com/
  31. https://isdown.app/status/mollie
  32. https://www.capterra.com/p/195767/Mollie/reviews/
  33. https://ca.trustpilot.com/review/mollie.com
  34. https://www.g2.com/products/mollie/reviews
  35. https://noda.live/articles/mollie-review
  36. https://www.paypal.com/us/enterprise/paypal-braintree-fees
  37. https://developer.paypal.com/braintree/docs/
  38. https://developer.paypal.com/braintree/articles/get-started/overview
  39. https://www.capterra.com/p/213069/Braintree/reviews/
  40. https://www.g2.com/products/capterra/reviews
  41. https://statusgator.com/services/braintree
  42. https://www.pulsapi.com/services/braintree
  43. https://braintree.pissedconsumer.com/review.html
  44. https://merchantinsiders.com/blogs/braintree-fees/
  45. https://www.checkout.com/pricing
  46. https://www.checkout.com/docs/developer-resources/sdks
  47. https://www.checkout.com/products/intelligent-acceptance
  48. https://www.prnewswire.com/news-releases/checkoutcom-launches-intelligent-acceptance-an-ai-powered-optimization-engine-that-boosts-acceptance-rates-and-increases-merchant-revenue-301863558.html
  49. https://www.g2.com/products/checkout-com/reviews
  50. https://chosepayments.com/insights/checkout-com-fees-explained
  51. https://status.checkout.com/
  52. https://www.checkout.com/docs/payments/optimize-payments/boost-acceptance-rates
  53. https://www.adyen.com/pricing
  54. https://docs.adyen.com/development-resources/libraries
  55. https://www.adyen.com/infrastructure
  56. https://status.adyen.com/
  57. https://www.trustpilot.com/review/adyen.com
  58. https://www.capterra.com/p/165680/Adyen/reviews/
  59. https://www.g2.com/products/adyen-payments/reviews
  60. https://www.prnewswire.com/news-releases/adyens-intelligent-payment-routing-achieves-26-cost-savings-and-improves-payment-performance-on-us-debit-transactions-302240823.html
  61. https://developer.mastercard.com/success-stories/adyen/