Finance & Billing
Payment Processing
Payment processors, checkout APIs, and merchant payment infrastructure.
Best Payment Processing tools by public signals
These picks are computed from scored public evidence. Use the openness column in the ranking to separate OSI-approved, source-available, open-core, proprietary, and unverified-license tools.
Use Case Rankings
Ordered by ToolVitals score, then health, shipping, confidence, GitHub stars, and name.
| # | Tool | Health | Shipping | Openness | Stars | Score | Status |
|---|---|---|---|---|---|---|---|
| 01 | Polar Turn your software into a business. | 97 | 98 | OSI-approved OSS | 10.3k | 98 | Active |
| 02 | Hyperswitch An open source payments switch written in Rust to make payments fast, reliable and affordable | 97 | 95 | OSI-approved OSS | 43.6k | 96 | Active |
| 03 | React Native Iap In App Purchase module for React Native that confirms OpenIAP | 96 | 96 | OSI-approved OSS | 139 | 96 | Active |
| 04 | BTCPay Server Accept Bitcoin payments. Free, open-source & self-hosted, Bitcoin payment processor. | 96 | 95 | OSI-approved OSS | 7.8k | 96 | Active |
| 05 | lomi. The open-source payment processing platform powering West African businesses. | 93 | 93 | OSI-approved OSS | 40 | 93 | Active |
| 06 | OwnPay The premier self-hosted, open-source payment gateway automation platform. Professional, secure, and developer-first. | 93 | 90 | OSI-approved OSS | 238 | 92 | Active |
| 07 | Paymenter Free and open-source webshop solution for hostings | 93 | 90 | OSI-approved OSS | 2.3k | 91 | Active |
| 08 | XCash Open-source self-hosted cryptocurrency payment gateway. | 80 | 82 | OSI-approved OSS | 177 | 81 | Active |
| 09 | Zoneless Open-source Stripe Connect alternative. ~$0.002 payout fees. Identical API to Stripe. Instant global USDC payouts. Self-hosted. | 77 | 76 | OSI-approved OSS | 535 | 77 | Active |
| 10 | Bitcart Bitcart is a free and open-source self-hosted payment processor for BTC, LTC, BCH, XMR, ETH, TRX, USDT and more | 69 | 49 | OSI-approved OSS | 986 | 61 | Warning |
| 11 | ePUSDT Cross-platform payment gateway for Easy Payment USDT. | 58 | 43 | OSI-approved OSS | 3.8k | 52 | Warning |
| 12 | PipraPay Open-source plugin-based payment gateway platform for self-hosted payment operations and automation. | 18 | 5 | OSI-approved OSS | 257 | 13 | Critical |
Not Scored
Tracked for context, but excluded from rankings because comparable open/source-visible evidence is unavailable.
Flowglad
Open source, zero webhooks payment provider
ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.Lemon Squeezy
All-in-one platform for selling digital products and SaaS subscriptions.
ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.Paddle
Complete billing solution for SaaS
ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.SaaS Payment Platform
Stripe/Xendit-inspired payment API built with Go and Next.js with auth, API keys, and gateway simulation.
ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.Stripe
Financial infrastructure for the internet
ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.UniPay
SDK that simplifies payment gateway integration through a unified interface.
ToolVitals does not score proprietary or unknown-license tools because their public source evidence is not comparable to open/source-visible projects.