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Sepolia uniswap v2 and superseed testnet add to metamask - CoerRex - 2025-02-19 What is a testnet? A testnet faucet provides web3 developers with free tokens for deploying, testing, and optimizing smart contracts on test blockchains such as Sepolia, Goerli, and Mumbai. Because smart contracts on public, mainnet blockchains like Ethereum and Polygon require gas fees to run smart contracts, testnets provide blockchain developers with a network that mirrors production blockchain environments without requiring gas fees that cost real money. Get Testnet Tokens! tecnología blockchain bsc testnet custom rpc4 ethereum is token or coin free btc telegram bot 2022 goerli linea faucet mine sepolia faucet смарт контракт эфириум hướng dẫn testnet aleo