Components 📦

fedimint-sdk is a Rust crate: one API for wallets and apps to join federations, hold ecash, and send and receive over Lightning and on-chain. The SDKs for the other languages are generated from it with UniFFI, so each of them is a view of that API and not a copy of it.

Component	Source	Published as
Rust SDK	rust/fedimint-sdk	fedimint-sdk on crates.io
Android SDK (Kotlin)	android	org.fedimint:sdk on Maven Central
iOS SDK (Swift)	ios	Not published yet
React Native	js/react-native	@fedimint/react-native and @fedimint/react-native-bindings on npm
Browser SDK	js/web/web-sdk	Not published yet

The README in each of these directories has the details for its component.

Structure 🛠️

The Rust crates are in rust/, the Android and iOS SDKs in android/ and ios/, and the JavaScript packages in a pnpm workspace rooted at js/.

fedimint-sdk
├── rust
│   ├── fedimint-sdk
│   ├── ubrn
│   └── uniffi-bindgen
├── android
├── ios
├── js
│   ├── android
│   │   └── integration-tests
│   ├── examples
│   │   ├── expo-app
│   │   └── react-native
│   ├── react-native
│   │   ├── react-native
│   │   └── react-native-bindings
│   └── web
│       └── web-sdk
├── nix
└── scripts

Examples

• rust/fedimint-sdk/examples: command-line programs that send and receive ecash, Lightning and on-chain payments.
• android/app: an Android app that calls the SDK through the Kotlin bindings.
• ios/Demo: the same app for iOS, in SwiftUI.
• react-native and expo-app: React Native apps, without and with Expo.

Contributing

See the contributing guide.

Developer Calls

• SDK Developer Calls: We have developer calls every Wednesday at 4PM UTC to review PRs and discuss current development priorities. As a new developer, this is a great place to find good first issues and mentorship from the core team on how to get started contributing.

Credit

Used the wagmi library as a reference for the repo's structure.

[!NOTE] In October 2025, this repository was renamed from "Fedimint Web Sdk" to "Fedimint Sdk" as the react-native packages were added. See the discussion topic for details.

[!NOTE] The TypeScript SDK that this repository published to npm is no longer developed, and no further versions of it are released: @fedimint/core, @fedimint/core-web, @fedimint/react, @fedimint/transport-web, @fedimint/types, @fedimint/fedimint-client-wasm-bundler, @fedimint/fedimint-client-wasm-web and create-fedimint-app. Its source is in this repository's history, for example at commit e4c7c59.