Open Source Metering and Usage Based Billing API ⭐️ Consumption tracking, Subscription management, Pricing iterations, Payment orchestration & Revenue analytics
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A self-hosted open source application for managing your invoices, clients and payments.
- php
- invoices
- invoicing
- open-source
Empower your hosting business with FOSSBilling, the free and open-source solution for efficient billing and client management.
Stripe.net is a sync/async .NET 4.6.1+ client, and a portable class library for stripe.com.
- stripe
- stripe-sdk
C#/.NET client library for the Binance.com cryptocurrency exchange REST and WebSocket APIs, supporting Spot and Futures trading and market data with strongly typed models.
- binance
- cryptocurrency
- tradeapi
- exchange
All in One PSA for MSPs, which Unifies client, contact, vendor, asset, license, domain, ssl certificate, password, documentation, file, network and location management with ticketing and billing capabilities, with a client portal on the side.
- crm
- ticketing-system
- ticket-management
- accounting
Oracle3: open-source trading engine and MCP server for prediction markets. Finds fee-adjusted no-arbitrage violations across related event contracts and trades them live on Kalshi, Polymarket and Solana, or on paper, under pre-trade risk limits. 13 MCP tools, JSON CLI, agent skills, 600+ tests.
- algorithmic-trading
- kalshi
- polymarket
- python
Open tax skills for AI: 2,250 skills across 266 jurisdictions, every figure cited to the law. Works in ChatGPT, Claude, Cursor and any MCP client.
Steam's protocol in Go to allow automation of different actions on the Steam network without running an actual Steam client. Includes APIs for friends, chatting, trading, trade offers and TF2 crafting.
- steam
- steamkit
Synchronize your ledger-cli files with your bank.
- ledger
- ofx
- accounting
💰💰 Convert currency rates directly from your terminal!
- exchange
- rates
- currency
- javascript
Analyze the Indonesian stock market (IDX/IHSG) from web terminal, CLI, or any AI agents via MCP server. IHSG Prices, Fundamentals, and Screening. Free and No API keys required. Changelog: https://github.com/fzn0x/idx/blob/main/CHANGELOG.md
Golang library for querying and parsing OFX
Adyen API Library for .NET
- adyen
- payments
- api-client
- api-library
基于麦当劳中国官方 MCP 的营养搭配工具：套餐逐件展开求官方营养、官方计价并标出每个金额的价源、取不到就如实标"未知"而不填 0。离线可跑，无需 Token。不提供下单能力。
"make your credit card form dreamy in one line of code"
- ember-addon
- ember
- credit-card
- ember-cli
QR code generator (ASCII & PNG) for SEPA payments
Open Source Php/NodeJs Online RPG and Trading Game Engine
- drupal-module
- mmorpg-client
- mmorpg-server
- nodejs
Complete, dependency-free Go client for the YNAB API — 44 operations, exact integer money, first-class delta sync, contract-tested. Unofficial.
- ynab
- ynab-api
- golang
- go
Go's answer to pandas + scikit-learn: a batteries-included data analysis library with dataframes, statistics, machine learning, quant, and GPU acceleration. Run Python with seamless two-way variable sharing, or explore data straight from the Insyra CLI.
:money_with_wings: PayPal REST API client for the Elixir language (elixir-lang)
Mollie Payments API client for Crystal http://www.mollie.com
Algorand QR Code generator is a JavaScript module that outputs an standard QR code (exportable to SVG file and text) from a JSON object. It works in terminal, NodeJS and modern browsers. Complies to Algorand ABNF Grammar.
Wisp CLI — Interactive trading platform for backtesting and live trading across spot, perpetual futures, options, and prediction markets