CROSSx Android SDK

A Kotlin native SDK for OAuth sign-in, wallet signing and sending, and EVM RPC helpers.

Capabilities

• OAuth sign-in (deep link callback)
• Session restore and refresh (initialize, ensureLoggedIn)
• Wallet address lookup, creation, and wallet selection
• Message, typed data, and transaction signing via SDK confirmation UI
• Transaction broadcast and receipt waiting
• RPC helpers (walletRpc, getBalance, getNonce)
• Wallet password verification and optional biometric authentication

Documentation order

1. Getting Started — Dependencies, callback scheme, creating CROSSxSDK
2. Authentication — Callback handling, session, sign-in and sign-out
3. Wallet — Addresses, signing, sending, RPC
4. API Reference — Signatures and types

Minimal configuration example

val config = SDKConfig(
    context = application,
    projectId = BuildConfig.CROSSX_PROJECT_ID,
    appName = getString(R.string.app_name),
    callbackScheme = BuildConfig.CROSSX_CALLBACK_SCHEME
)

val sdk = CROSSxSDK(application = application, config = config)

Notes

• Wallet and RPC APIs require an explicit chainId (e.g. eip155:612044).
• Use walletRpc for reads and calls; use dedicated APIs for transaction signing and broadcast.