How to Add Token Swaps to Your Rust Backend

Rust is the most admired programming language for the tenth consecutive year, and the blockchain ecosystem built on Rust now processes over 200 million transactions daily. If you are building a DeFi backend, trading bot, or wallet service in Rust, you need a way to execute token swaps without managing router contracts, liquidity pools, or DEX protocol upgrades yourself. This guide shows you how to integrate a token swap API into a Rust backend using Axum, reqwest, and a single GET request to swapapi.dev -- a free DEX aggregator covering 46 EVM chains with no API key required. What You Will Need Before starting, make sure you have these tools installed: Rust 1.75+ with Cargo An Ethereum-compatible wallet address (for the sender parameter) A terminal with curl for testing Add the following dependencies to your Cargo.toml: [dependencies] axum = "0.8" tokio = { version = "1", features = ["full"] } reqwest = { version = "0.12", features = ["json"] } serde = { version = "1", features = ["der