47,133 repositories indexed
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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
A unified trading API with more than 100 crypto exchanges and prediction markets in JavaScript / TypeScript / Python / C# / PHP / Go / Java / Rust
Download market data from Yahoo! Finance's API
AKShare is an elegant and simple financial data interface library for Python, built for human beings! 开源财经数据接口库
QuestDB is a high performance, open-source, time-series database
A 100% free modern JS SaaS boilerplate (React, NodeJS, Prisma). Full-featured: Auth (email, google, github, slack, MS), Email sending, Background jobs, Landing page, Payments (Stripe, Polar.sh), Shadcn UI, S3 file upload. AI-ready with tailored AGENTS.md, skills, and Claude Code plugin. One cmd deploy. Powered by Wasp full-stack framework.
QuestPDF is a modern library for PDF document generation. Its fluent C# API lets you design complex layouts with clean, readable code. Create documents using a flexible, component-based approach.
A collection of services with great free tiers for developers on a budget. Sponsored by Mockoon, the best mock API tool. https://mockoon.com
Open Source Metering and Usage Based Billing API ⭐️ Consumption tracking, Subscription management, Pricing iterations, Payment orchestration & Revenue analytics
Polar — A billing platform for the intelligence era
Free open source crypto trading bot to automate AI, Grid, DCA and TradingView strategies on Binance, Hyperliquid and 15+ exchanges, with a simple interface.
Github.com/CryptoSignal - Trading & Technical Analysis Bot - 4,100+ stars, 1,100+ forks
Node.js library for the Stripe API.
XChange is a Java library providing a streamlined API for interacting with 60+ Bitcoin and Altcoin exchanges providing a consistent interface for trading and accessing market data.
💵 Independent financial accounting with intelligent reporting, alternative to Quickbooks, Xero, Wave.
PHP library for the Stripe API.
A high-frequency trading model using Interactive Brokers API with pairs and mean-reversion in Python
Go library for the Stripe API.
ATLAS by General Intelligence Capital — Self-improving AI trading agents using Karpathy-style autoresearch
A Terminal-style trading dashboard built entirely on free public market data. No API keys, no subscriptions.
Ruby library for the Stripe API.
Trading and Backtesting environment for training reinforcement learning agent or simple rule base algo.
Python module to get stock data from Yahoo! Finance
A lightweight USDT/USDC payment gateway with multi-chain support, integration guides, SDK documentation, and merchant demos.轻量级 USDT/USDC 支付网关，提供多链支持、接入指南、SDK 文档和商户演示程序。