Vibe Coding a Batch Swap App using 0x, Dune, and EIP5792/7702

The article describes how the author built a batch token swap app using a Herd "trail" that combines Dune's SIM balances API with 0x swap contracts, with the app vibe coded in v0 and Cursor. The trail uses the 0x aggregator for swaps, with USDC hardcoded as the buy token and users choosing the sell token and amount, and Dune's balances API supplies the wallet's tokens, balances and USD values. For batching, the app calls the trail once per selected token and sends the swaps together through viem's sendCalls and waitForCallsStatus, using EIP-7702 by default with an EIP-5792 fallback for wallets that lack it. The author says the app took less than half an hour to build.