# Serai Serai is a decentralized execution layer whose validators form multisig wallets for various connected networks, offering secure decentralized custody of foreign assets to applications built on it. Serai is exemplified by Serai DEX, an automated-market-maker (AMM) decentralized exchange, allowing swapping Bitcoin, Ether, DAI, and Monero. It is the premier application of Serai. ### Substrate Serai is based on [Substrate](https://docs.substrate.io), a blockchain framework offering a robust infrastructure.