MetaMask USD (mUSD) is a cryptocurrency stablecoin, launched by MetaMask in September 2025. Issued by Bridge, and powered by M0, mUSD is the first stablecoin created by a self-custodial wallet. A stablecoin is a type of token that’s designed to maintain a steady value, by being pegged to less volatile assets like the US Dollar. mUSD is backed by short-term US Treasury bills that are held in regulated custody and issued through a framework developed by Bridge.xyz using the M0 protocol. For every 1 mUSD in circulation, there is an equivalent dollar-backed asset held in reserve.

MetaMask USD initially launched on Ethereum Mainnet (EVM), as well as Linea, an EVM Layer 2, where the token plays a pivotal role. Integration of mUSD includes core EVM protocols, lending markets, decentralized exchanges (DEXs), and custodial platforms. mUSD can be used in seamless fiat-to-crypto onramps, swaps, trades, and decentralized finance (DeFi). mUSD is also spendable via MetaMask Card at Mastercard merchants worldwide.

As a wallet-native stablecoin, mUSD is designed to simplify your journey across crypto, from onramping and holding to earning and spending, all within MetaMask. It enables users to move in and out of blockchain ecosystems more efficiently. Stablecoins like mUSD are vital to DeFi, underpinning trading, lending, and remittances. They also serve as a bridge between traditional finance (TradFi) and DeFi ecosystems.