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Payments

Open source payment processing and billing infrastructure.

BTCPay Server
MIT
Self-hosted, open source cryptocurrency payment processor with no fees and no middleman.
Actively maintained
- Payments
Hyperswitch
Apache-2.0
Open source payments orchestration platform that routes transactions across multiple payment processors with intelligent routing and a PCI-compliant, self-hostable core.
Actively maintained
- Payments
Kill Bill
Apache-2.0
Open source subscription billing and payments platform for running recurring revenue, invoicing and billing logic on your own infrastructure.
Actively maintained
- Payments
Lago
AGPL-3.0
Open-source usage-based billing and metering infrastructure for turning product usage - API calls, compute, tokens - into pricing, invoices, and revenue.
Actively maintained
- Payments
OpenMeter
Apache-2.0
Real-time usage metering and billing for AI, API and DevOps products -- collects and aggregates millions of usage events to drive usage-based pricing, entitlements and invoices.
Actively maintained
- Payments
Polar
Apache-2.0
Open-source billing platform for selling software -- subscriptions, one-time purchases and usage-based pricing, with Polar acting as merchant of record for global sales tax.
Actively maintained
- Payments