MetaMask Sign in injects a global API into websites visited by its users at window.ethereum . This API allows websites to request users' Ethereum accounts, read data from blockchains the user is connected to, and suggest that the user sign messages and transactions.The eminent Ethereum trading wallet-MetaMask Sign in allows its users to trade on the Ethereum blockchain. This platform allows its users to send, store, and swap crypto tokens securely by keeping their identities anonymous. Once you set up your software wallet account on MetaMask,MetaMask Extension for accessing Ethereum enabled distributed applications, or "Dapps" in your browser! The extension injects the Ethereum web3 API into every website's javascript context, so that dapps can read from the blockchain.