How to Build a Limit Order Bot with Swap API

Decentralized exchanges processed $876 billion in spot volume in Q2 2025 alone , yet most of that volume still executes as market orders. Limit orders -- the ability to buy or sell at a specific price rather than the current one -- remain the most requested feature traders want from DEXs. The crypto trading bot market is now valued at over $47 billion , driven by demand for automated execution without centralized custody. If you have ever watched a token dump right after you manually swapped at the top, a limit order bot solves that exact problem. This guide shows you how to build a limit order bot in Python that polls prices using swapapi.dev and executes swaps when your target price is reached. The API is free, requires no API key, supports 46 EVM chains, and returns executable calldata in a single GET request. What You'll Need Python 3.10+ web3.py for wallet management and transaction submission requests for HTTP calls to the swap API A wallet with a private key (use a dedicated bot