A simple Node.js 8.x script to trade ETH for ERC20 compatible tokens and back using shapeshift.io instant crypto exchange.
ERC20 tokens are withdrawn to the same fundsAddress which contains ETH so all assets always end up associated with fundsAddress after each shapeshift.
npm install
.env should have INFURA_ACCESS_TOKEN (only if you use Infura instead of Geth), ETHEREUM_WALLET_DATA_DIR, FUNDS_ACCOUNT_ADDRESS, FUNDS_ACCOUNT_PASSWORD environment variables, i.e. the script assumes Ethereum Wallet to get the funds address private key fundsAddressPrivateKey using keythereum.
Geth should be running with --rpc flag to enable HTTP JSON-RPC for synchronous web3.js calls. Or just uncomment Infura provider:
const web3 = new Web3(new Web3.providers.HttpProvider(`https://mainnet.infura.io/${process.env.INFURA_ACCESS_TOKEN}`));ERC20 token symbol to be shapeshifted is hardcoded in index.js, which is all required to edit for other ERC20 tokens as the script loads ethTokens.json for popular token contract address lookup, and communicates with all contracts via JSON ABI for the Ethereum ERC 20 Token Standard.
const erc20Symbol = 'EOS';npm start