• Ethers.js docs
• EIP-1559
• gas fees

1. Bsc URL:

https://data-seed-prebsc-1-s1.binance.org:8545/

chainId: 97 explorer:

https://testnet.bscscan.com

faucet:

https://testnet.binance.org/faucet-smart

2. Polygon(mumbai) url:

https://polygon-mumbai.g.alchemy.com/v2/fMjHvBA5ypcgTlLHORvLGcEE280I5zNY

chainId: 8001 explorer:

https://mumbai.polygonscan.com/

faucet:

https://faucet.polygon.technology/

3. Fantom url:

https://rpc.testnet.fantom.network/

or chainId: 4002 explorer:

https://explorer.testnet.fantom.network/

faucet: