Add few TestNets
In order to send tokens from external networks, you need to add those networks to your MetaMask and get some free coins and tokens.
Let's add Ethereum testnet (Goerli)
Open MetaMask > Select Network > Show/hide test networks > Select "Show test networks" in-network list
Network name: Ethereum TestNet
New RPC URL: https://goerli.infura.io/v3/
Network ID: 5
Currency Symbol: GoerliETH
Block explorer URL: https://goerli.etherscan.io
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Add some coins and tokens with Goerli Faucet
Let's add the Binance Smart Chain testnet
Open MetaMask > Select Network > Add Network > Add Network Manually
Network name: BSC TestNet
New RPC URL: https://data-seed-prebsc-1-s1.binance.org:8545
Network ID: 97
Currency Symbol: tBNB
Block explorer URL: https://testnet.bscscan.com/
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Add some coins and tokens with BNBchain testnet Faucet
Let's add Polygon testnet (Mumbai)
Open MetaMask > Select Network > Add Network > Add Network Manually
Network name: POLYGON TestNet
New RPC URL: https://rpc-mumbai.maticvigil.com/
Network ID: 80001
Currency Symbol: tMATIC
Block explorer URL: https://mumbai.polygonscan.com/
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Add some coins and tokens with Polygon TestNet Faucet
Let's add SKALE testnet (EUROPA)
Open MetaMask > Select Network > Add Network > Add Network Manually
Network name: SKALE TestNet
New RPC URL: https://staging-v3.skalenodes.com/v1/staging-fast-active-bellatrix
Network ID: 0x1c6199cc
Currency Symbol: tSKALE
Block explorer URL: https://staging-fast-active-bellatrix.explorer.staging-v3.skalenodes.com
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Let's add Optimism testnet (Goerli)
Open MetaMask > Select Network > Add Network > Add Network Manually
Network name: OPTIMISM TestNet
New RPC URL: https://optimism-goerli.publicnode.com
Network ID: 420
Currency Symbol: tETH
Block explorer URL: https://goerli-optimism.etherscan.io
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Let's add Arbitrum testnet (Goerli)
Open MetaMask > Select Network > Add Network > Add Network Manually
Network name: ARBITRUM TestNet
New RPC URL: https://arbitrum-goerli.publicnode.com
Network ID: 421613
Currency Symbol: tAGOR
Block explorer URL: https://goerli.arbiscan.io/
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Let's add Avalanche testnet (C-Chain)
Open MetaMask > Select Network > Add Network > Add Network Manually
Network name: AVALANCHE TestNet
New RPC URL: https://api.avax-test.network/ext/bc/C/rpc
Network ID: 43113
Currency Symbol: tAVAX
Block explorer URL: https://testnet.snowtrace.io
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Add some coins and tokens with Avalanche TestNet Faucet
Let's add BASE testnet (Goerli)
Open MetaMask > Select Network > Add Network > Add Network Manually
Network name: BASE TestNet
New RPC URL: https://base-goerli.publicnode.com
Network ID: 84531
Currency Symbol: tETH
Block explorer URL: https://goerli.basescan.org
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Add some coins and tokens with BASE TestNet Faucet
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