Comprehensive toolkit for building applications with JPYC (Japanese Yen Pegged Coin). Use this skill when developing with JPYC token, implementing payment features, integrating JPYC SDK, deploying JPYC contracts to Base Sepolia, or building DApps with JPYC. Supports both JPYC SDK v1 usage and direct Solidity smart contract development with Hardhat, ethers.js, viem, Next.js, and React.