Comprehensive development support for Circle's stablecoin ecosystem including USDC/EURC integration, wallet solutions (Developer-Controlled, User-Controlled, Modular), cross-chain transfers (CCTP, Bridge Kit, Gateway), smart contracts, and payment APIs. Use when building applications with Circle for - (1) Stablecoin payments and transfers, (2) Wallet creation and management, (3) Cross-chain USDC/EURC transfers, (4) Smart contract deployment and management, (5) Gas fee sponsorship and optimization, (6) Circle Mint integration, (7) Global payment settlement, (8) FX operations with stablecoins. Covers SDK usage (TypeScript/JavaScript), API integration (REST), smart contract development (Solidity), and Circle-specific features like programmable wallets, native cross-chain transfers, and gasless transactions.