Here's what I actually shipped:
β Connected to Ethereum mainnet via RPC using Ethers.js
β Reads live wallet balances and token data from the chain
β Integrated Uniswap V2/V3 router calling swapExactTokensForTokens() to execute real swaps
β Understands gas estimation, transaction signing, and contract ABIs
β Wrapped the whole thing in a desktop app using Electron.js