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Learn the Basics of the Ethereum JSON API in 5 Minutes. Learn the basics of the API in five minutes using the web3 library. Use an Infura Node to connect to the Ethereum Ropsten Testnet. Fetching the gas price of the network and sending transactions is a simple request. Create our transaction and sign it off using the API once more: Once more, send it to the Faucet. Use the API to send the nonce nonce to fetch the latest nonce at the latest block.