Polar Dart SDK & More

🧊 polar-dart (unofficial)

GitHub Repository
Status: Under Development

🔧 Overview

polar-dart is a Dart SDK for Polar.sh — a platform building open-source payment infrastructure for developers. This project aims to provide full Dart and Flutter compatibility, including support for Flutter Web.

I built this SDK from the ground up, including:

  • 🚀 Custom SDK Generator: Created a Dart-based SDK generator tailored for Polar’s OpenAPI specification, overcoming compatibility issues with standard generators.
  • 📦 Multi-Platform Support: Ensured the SDK works seamlessly across Dart CLI, Flutter mobile, and Flutter web environments.
  • 📖 Educational Resources:

🛠️ Features

  • Developed a custom code generator using pure Dart.
  • Built SDK modules from Polar’s OpenAPI specification manually to resolve compatibility issues.
  • Included a web-based playground (work in progress).

📘 Detailed Thing

When I first came across Polar.sh, I was instantly drawn to its vision: empowering open-source developers with sustainable monetization tools. I wanted to contribute in a meaningful way.

At the time, there was no Dart SDK for Polar, even though other languages had SDKs auto-generated via OpenAPI generators. Unfortunately, Polar’s OpenAPI spec was incompatible with existing Dart SDK generators — they failed to produce usable code due to several large issues.

So I built one from scratch.

I wrote a custom Dart script that reads the polar.json OpenAPI spec and generates a fully usable Dart SDK. This SDK supports both CLI and Flutter apps, including Flutter Web. The project is structured as a mono-repo, containing:

  • The code generator (pure Dart)
  • The generated SDK
  • A web-based playground (under development)

Although still a work-in-progress and not yet production-ready, polar-dart serves as a proof of concept — showcasing what’s possible with Flutter, Dart, and open-source spirit (& my skills).

📚 Read More

This journey has been as much about learning as it has been about building. From understanding OpenAPI internals to architecting a multi-platform SDK, it has deepened my appreciation for the open-source developer tooling ecosystem.