5 Best Token Swap APIs for Python Developers

The best token swap API for Python developers is one that returns executable calldata from a simple HTTP request — no SDK installation, no ABI encoding, no router contract management. With over 70% of crypto spot trading now automated and Python dominating algorithmic trading, choosing the right swap API determines whether your bot takes 10 lines of code or 200. This guide compares the 5 best token swap APIs that work natively with Python's requests library, web3.py , or httpx — ranked by integration simplicity, chain coverage, and how fast you can go from zero to executing swaps on-chain. 1. Swap API (swapapi.dev) Swap API is the most Python-friendly token swap API available. It requires zero dependencies beyond requests — no SDK, no API key, no account. A single GET request returns a complete transaction object you can send directly with web3.py . The API supports 46 EVM chains and returns to , data , and value fields ready for web3.eth.send_transaction() . It also provides recommend