Mobile Wallet Adapter (MWA)

An open protocol and SDK that defines a local communication channel (via Android intents and a localhost WebSocket) between mobile dApps and Solana wallet apps installed on the same device, allowing dApps to request transaction signing and message signing without exposing private keys. MWA v2 supports authorization scoping, chain-agnostic signing, and session caching, and is the standard integration layer used by Phantom, Solflare, and other mobile Solana wallets.