FintechToolkit
  • Tools
  • Categories
  • Guides
  • Comparisons
  • Open Source
/

FintechToolkit

The AI- and developer-first directory of fintech infrastructure tools. Curated APIs, data sources, and open-source projects for builders shipping payments, banking, and beyond.

Know a tool that belongs here?

Submit a Tool

Browse

  • All Tools
  • Categories
  • Guides
  • Comparisons
  • Open Source

Categories

  • Payments & Billing
  • Open Banking
  • Identity & KYC
  • Market Data

© 2026 FintechToolkit. The toolkit for fintech builders.

MethodologyCorrectionsPrivacyTerms
  1. Home
  2. Comparisons
  3. Payment API selection for SaaS and marketplaces

Payment API selection for SaaS and marketplaces

A transparent requirements-led comparison of payment processors and merchant-of-record platforms.

By FintechToolkit Editorial Team

How to use this comparison

Evaluates payment processors based on geographic coverage, API protocols, settlement options, pricing models, and developer ergonomics.

Documented comparison matrix

DimensionStripeAdyenCheckout.comPaddleLemon Squeezy
CategoriesPayments & BillingPayments & BillingPayments & BillingPayments & BillingPayments & Billing
Product typesAPI, SDKAPI, PlatformAPIAPI, PlatformAPI
Geographic coverageGlobalGlobalGlobalGlobalGlobal
Pricing modelUsage-basedUsage-basedUsage-basedUsage-basedUsage-based
API protocolsREST, WebhooksREST, WebhooksREST, WebhooksREST, WebhooksREST, Webhooks
AuthenticationAPI keyAPI keyAPI keyAPI keyAPI key
Official SDKsNode, Python, Ruby, PHP, Java, Go, .NETNode, Python, Java, PHP, Go, .NET, RubyNode, Python, Java, PHP, .NETNode, PHP, PythonNode, PHP
SandboxAvailableAvailableAvailableAvailableAvailable
Primary sourcesOfficial docs Official docs Official docs Official docs Official docs

Validate these before choosing

Your launch market and coverageRequired payment or data railsSandbox behavior and integration effortCommercial model and supportSecurity, compliance, and procurement requirements

The matrix is a research starting point. Product coverage, commercial terms, and eligibility change, so validate these items directly with shortlisted providers.