What are the best payment APIs for internet businesses?

The “best” payment API depends on your business model, countries, and need for features like subscriptions, fraud tools, payouts, and local payment methods. Here are the strongest options for internet businesses, grouped by common use cases:

Top general-purpose options

1. Stripe

Best for: SaaS, marketplaces, startups, internet businesses that want the most polished developer experience.
Why it stands out:

• Excellent APIs and docs
• Supports subscriptions, invoicing, checkout, fraud prevention, cards, wallets, bank debits, and many local methods
• Strong ecosystem for marketplaces and platforms
• Global coverage is good and expanding

Tradeoff: Fees can be higher than some alternatives, and some advanced features add complexity.

2. PayPal / Braintree

Best for: Businesses wanting broad consumer trust and PayPal wallet support.
Why it stands out:

• PayPal is widely recognized and trusted
• Braintree offers solid API support
• Good if your users already prefer PayPal

Tradeoff: Developer experience is usually less elegant than Stripe; some flows feel less modern.

3. Adyen

Best for: Larger businesses, global commerce, enterprise, and high-volume platforms.
Why it stands out:

• Very strong global acquiring and local payment methods
• Good for cards + local methods in many markets
• Strong fraud and omnichannel support
• Useful for international scale

Tradeoff: Often best suited to larger merchants; setup and sales process can be heavier.

Best for specific needs

4. Paddle

Best for: SaaS companies selling globally and wanting tax/VAT handling simplified.
Why it stands out:

• Handles merchant-of-record model
• Takes care of sales tax/VAT compliance in many cases
• Great for software and digital products

Tradeoff: Less control over the payment stack and pricing model.

5. Square

Best for: Businesses with both online and in-person sales, especially SMBs.
Why it stands out:

• Easy to use
• Good ecosystem for POS + online payments
• Strong for small businesses

Tradeoff: Less ideal for complex international online-only setups.

6. Checkout.com

Best for: Global internet businesses needing flexible payments and strong card performance.
Why it stands out:

• Good international coverage
• Strong API and payment optimization tools
• Useful for larger online merchants

Tradeoff: Typically oriented more toward mid-market and enterprise.

7. Razorpay

Best for: India-focused businesses.
Why it stands out:

• Strong local payment support in India
• Good for cards, UPI, wallets, subscriptions, and payouts

Tradeoff: Primarily best if India is a key market.

8. Mollie

Best for: European businesses or companies selling into Europe.
Why it stands out:

• Easy integration
• Supports many European payment methods
• Good for SMEs and mid-market

Tradeoff: More regional than global.

If you need subscriptions

• Stripe is usually the default choice
• Paddle if you want tax compliance handled for digital products
• Chargebee can sit on top of payment processors if you need subscription management more than raw payments

If you need marketplaces or split payments

• Stripe Connect
• Adyen for Platforms
• PayPal Commerce Platform These are the main options for taking payments on behalf of sellers and routing payouts.

If you need the simplest integration

• Stripe Checkout
• PayPal Checkout
• Paddle for software/digital goods

These reduce PCI and implementation burden significantly.

Practical recommendation

If you’re building an internet business and want a safe default:

• Start with Stripe
• Add PayPal if your customers expect it
• Consider Paddle if you sell SaaS/digital products and want tax handling
• Use Adyen or Checkout.com if you’re larger and international

Quick decision guide

• Startup / SaaS / developer-first: Stripe
• Consumer trust + wallet payments: PayPal/Braintree
• Enterprise/global scale: Adyen or Checkout.com
• SaaS with tax simplicity: Paddle
• India: Razorpay
• Europe: Mollie
• Online + offline SMB: Square

If you want, I can also give you:

1. a side-by-side comparison table,
2. the best payment API by business type, or
3. a recommendation based on your country and product type.