The bridge honors this request by minting or sending the tokens to the account you specified on the destination network. The deposit may be validated in a few different ways depending on the bridge, but this process essentially buys you the right to have your target address credited with the agreed amount of tokens (that is: the token you're bridging to). The bridge will prompt you to sign a transaction to send the tokens to their address (for tokens other than ETH, this assumes you've already signed an approval granting it access to your tokens). When you request to move Ethereum from Mainnet to Polygon, for example, the first thing the bridge will need to do is have you deposit the ETH to the bridge. Though the exact system varies, each bridge has a mechanism to validate your deposit on one network and issue equivalent tokens on another network. To dive a bit deeper:Īt their most basic level, bridges are platforms with contracts on the chains you're transferring to and from. You can use a bridge to transfer some ETH, USDC, or other tokens from Ethereum to Polygon - retaining their value - and start to use them with dapps on Polygon. For example, perhaps you want to use a dapp or a game on the Polygon network, but most of your funds are on Ethereum mainnet. It’s analogous to visiting travel sites that find you the cheapest flight from numerous airlines, or - slightly closer to home - using MetaMask Swaps to find you the cheapest token swap quote from decentralized exchanges.Ī bridge allows you to transfer your tokens between different blockchain networks. Think of it as an aggregator of aggregators, or meta-aggregator. From here, you can pick the quote that's best for you and move your tokens to the network you need. The Bridge feature in MetaMask Portfolio does exactly what it says on the tin: it pulls together bridging quotes for you to choose from. As we don't currently support bridging BNB, this means you'll need to get these into your wallet on this network either through an on-ramp (buying with conventional currency, and having the tokens deposited into your wallet), having tokens sent to your wallet, or buying from an exchange that supports the network and transferring them. Want to bridge to a network you've never used before? Read this first!īefore you move your funds onto another network, remember that you'll need native tokens on that network to use them further.
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