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Open source, composable payments platform | PCI compliant | SaaS and Self-host options | Enables connectivity to multiple payment, payout, fraud, vault and tokenization providers | Uplifts authorization with intelligent routing and revenue recovery | Reduce payment processing costs with cost observability | Reduces payment ops with reconciliation
Polar — A billing platform for the intelligence era
Bindu: The identity, communication, and payments layer for AI agents.
The user infrastructure platform. You choose the frontend, backend, and database. Hexclave handles everything else.
A payments protocol for the internet. Built on HTTP.
Open-Source Subscription Billing & Payments Platform
Active Merchant is a simple payment abstraction library extracted from Shopify. The aim of the project is to feel natural to Ruby users and to abstract as many parts as possible away from the user to offer a consistent interface across all supported gateways.
In-app purchases and subscriptions made easy. Support for iOS, watchOS, tvOS, macOS, and visionOS.
A self-hosted UPI & COD payment gateway with zero per-transaction platform fees, universal JavaScript checkout integration, dynamic QR payments, WhatsApp OTP authentication, and automated payment verification.
Laravel Cashier provides an expressive, fluent interface to Stripe's subscription billing services.
Payments for Ruby on Rails apps
Source code of the recurrent donations platform Liberapay
PHP Payment processing library. It offers everything you need to work with payments: Credit card & offsite purchasing, subscriptions, payouts etc.
TranslatedA lightweight USDT/USDC payment gateway with multi-chain support, integration guides, SDK documentation, and merchant demos.
dj-stripe automatically syncs your Stripe Data to your local database as pre-implemented Django Models allowing you to use the Django ORM, in your code, to work with the data making it easier and faster.
The JavaScript library for ExtensionPay.com — payments for your browser extensions, no server needed.
ACH implements a reader, writer, and validator for Automated Clearing House (ACH) files. The HTTP server is available in a Docker image and the Go package is available.
SDK for growing mobile in-app purchases
Self-hosted, non-custodial stablecoin payment gateway with x402 and invoice checkout. Accepts USDC, USDT, PYUSD and DAI across 8 networks with QR payments, payment links, settlement tracking and signed webhooks. REST API, micropayments, exports, zero platform fees and no KYC. Python, cross-platform.
Lightweight Bitcoin payment processor written in easily deployable Python. Self custody donations and payments on-chain & Lightning network, directly connected to your own Bitcoin node! No middleman/custodian.
Build, Measure and Grow iOS subscription business
Pocketbase extention built in Go with stripe webhooks currently in use at sign365.com.au and fastpocket.dev
Multi-merchant UPI payment gateway with dynamic QR, auto-verification & signed webhooks — Laravel 12
💸 Crypto Payments straight to your wallet. DePay simplifies Web3 integration for developers, harnessing DeFi to accept any token effortlessly. Integrate frictionless, real-time token conversion with sleek, customizable widgets designed for seamless user experience.