JavaScript SDKs

Everything you need to integrate the embedded wallet into a web application, from a low-level TypeScript SDK to a drop-in React UI kit.

Pick the layer that matches your stack — each layer builds on the one below it:

Layer	Package(s)	Use when
JS-Core	`@nexus-cross/crossx-sdk-core`	Vanilla JS / TS, any framework, Node.js. Full control over auth, wallet, signing, and RPC.
JS-React	`@nexus-cross/crossx-sdk-react`	React apps that do not use wagmi. Provider + hooks (`useAuth`, `useWallet`) over the Core SDK.
JS-Wagmi	`@nexus-cross/crossx-sdk-wagmi`	Apps built on wagmi / viem. Exposes the embedded wallet as a standard wagmi connector.
App Launcher (Connect Kit)	`@nexus-cross/connect-kit-react` · `@nexus-cross/connect-kit-wagmi` · `@nexus-cross/connect-kit-core` · `@nexus-cross/dapp-ui`	You want a complete, production-ready wallet UI — connect modal, wallet info panel, portfolio, buy/send/bridge — with a few lines of setup.

Which one should I use?

Building a DApp and want wallet UI out of the box? Start with the App Launcher (Connect Kit). It wraps the SDKs below and ships the full CROSS ecosystem UI: connect button + modal, wallet info, portfolio, on-ramp, bridge, and more.
Already on wagmi and want to keep your own UI? Use JS-Wagmi to add the embedded wallet as one more connector.
React without wagmi? Use JS-React.
No React at all, or server-side / game-engine WebView integration? Use JS-Core directly.

All layers share the same project ID, OAuth-based login (Google / Apple / JWT), PIN-protected embedded wallet, and chain registry.