This is all the info you need to know to connect these three major layer2 solutions to your Metamask wallet.
XDAI:
Network Name: xDai
New RPC URL: https://rpc.xdaichain.com/
Chain ID: 0x64
Symbol: xDai
Block Explorer URL: https://blockscout.com/xdai/mainnet
POLYGON:
Network Name: Polygon
New RPC URL: https://rpc-mainnet.matic.network
ChainID: 137
Symbol: MATIC
Block Explorer URL: https://polygonscan.com/
BINANCE:
Network Name: Smart Chain
New RPC URL: https://bsc-dataseed.binance.org/
ChainID: 56
Symbol: BNB
Block Explorer URL: https://bscscan.com