Advanced features

The SDK supports advanced features that may be useful in specific use cases:

• Custom configuration enables fine-tuning the SDK behavior with various configuration options
• Custom leaf optimization allows defining the leaf optimization policy and controlling when it occurs in order to minimize payment latency
• Conditional payments are useful for implementing atomic cross-chain swaps
• Using an External Signer provides custom signing logic and enables integrating with hardware wallets, MPC protocols, or existing wallet infrastructure
• Server mode is the SDK profile for multi-tenant server deployments where each request builds an ephemeral SDK and the host orchestrates sync, claiming, and event delivery explicitly
• Client signing lets a server drive payments while the key that approves them stays with the user, who reviews and signs each payment on their side
• Using Turnkey runs the wallet's signing inside a Turnkey secure enclave, so a server can operate wallets without holding key material
• Send USDC/USDT to a recipient on an external chain