To implement multi-currency support, your wallet must be compatible with multiple blockchain protocols. You can integrate support for Bitcoin, Ethereum, and other popular coins by using APIs like Bitcoin Core, Ethereum Web3.js, or multi-chain APIs such as Moralis or Chainlink. Your wallet should detect the relevant blockchain for each cryptocurrency, and users should be able to view their balances, send and receive assets, and swap tokens between different chains. Implementing a multi-currency wallet involves designing an intuitive UI to display the assets in a clear, categorized manner. Keep in mind, each blockchain has unique transaction protocols, so thorough testing for each one is essential. Itβs also important to keep wallet addresses distinct for each currency while offering seamless interaction for users.
source: https://www.blockchainappfacto...y-wallet-development