Use Developer Controlled Wallets

This brings Circle's developer-controlled wallets SDK into Claude, letting you build applications that create and manage custodial wallets on behalf of users. You get full programmatic control over wallet creation, token transfers, contract execution, and message signing across EVM chains, Solana, Aptos, and NEAR, while Circle handles key security through encrypted entity secrets and manages blockchain infrastructure. The skill covers both EOA and smart contract account types, walks through the complete transaction lifecycle from initiation to finality, and includes practical patterns for balance checks, fee estimation, and transaction acceleration. The documentation is security-focused and won't let you hardcode secrets or skip confirmation prompts on mainnet operations. Good fit if you're building wallets, payment flows, or any app where you need to hold custody rather than passing keys to end users.