Payment processing choices are not interchangeable: some projects focus on payment switching, some on self-hosted crypto checkout, and some on newer wallet or payout workflows. For May 2026, ToolVitals ranks these Payment Processing Tools using the supplied health, shipping, openness, license, GitHub star, and ToolVitals score data.
This ranking includes only open or source-visible tools, ordered by ToolVitals score first and GitHub stars as a secondary popularity signal. Every listed tool is labeled OSI-approved OSS in the supplied data, so the license labels are reported directly rather than treating source-visible or fair-code projects as OSI open source.
Rankings
| Rank | Tool | Openness | License | Health | Shipping | GitHub Stars | Score | Status |
|---|---|---|---|---|---|---|---|---|
| 1 | Hyperswitch | OSI-approved OSS | Apache-2.0 | 92 | 86 | 42704 | 92 | 🟢 Excellent |
| 2 | Polar | OSI-approved OSS | Apache-2.0 | 86 | 81 | 9851 | 87 | 🟢 Excellent |
| 3 | BTCPay Server | OSI-approved OSS | MIT | 85 | 83 | 7565 | 86 | 🟢 Excellent |
| 4 | ePUSDT | OSI-approved OSS | GPL-3.0 | 87 | 93 | 3467 | 86 | 🟢 Excellent |
| 5 | SpawnPay | OSI-approved OSS | MIT | 69 | 77 | 0 | 78 | 🟢 Good |
| 6 | Paymenter | OSI-approved OSS | MIT | 78 | 65 | 1711 | 76 | 🟢 Good |
| 7 | Bitcart | OSI-approved OSS | MIT | 73 | 69 | 941 | 76 | 🟢 Good |
| 8 | Zoneless | OSI-approved OSS | Apache-2.0 | 74 | 42 | 296 | 70 | 🟢 Good |
Top 3 Highlights
Hyperswitch ranks first with a ToolVitals score of 92, the highest health score in the set at 92, and a strong shipping score of 86. It also has the largest GitHub footprint here at 42,704 stars, which reinforces its lead under the secondary popularity tie-breaker. The project is labeled OSI-approved OSS with an Apache-2.0 license_label, and its description positions it as a Rust payments switch focused on payment speed, reliability, and affordability.
Polar ranks second with a ToolVitals score of 87, backed by a health score of 86 and shipping score of 81. Its 9,851 GitHub stars make it the second-most-starred tool in this ranking. The supplied metadata labels Polar as OSI-approved OSS with an Apache-2.0 license_label, and its description frames it around turning software into a business rather than only handling checkout infrastructure.
BTCPay Server ranks third with a ToolVitals score of 86, a health score of 85, and a shipping score of 83. It has 7,565 GitHub stars, the strongest popularity signal among the tools tied at 86. The project is labeled OSI-approved OSS with an MIT license_label, and the supplied description is specific: it is a free, self-hosted Bitcoin payment processor.
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