Home / Market & alternative data
SwapAPI
Free DEX swap quotes with signable transaction calldata
What it is
A hosted HTTP API that returns an unsigned token-swap transaction for EVM chains, so a caller can sign and broadcast it without an aggregator SDK. One GET supplies the chain, token addresses, amount and sender, and the reply carries route status, expected and minimum output, price impact and a ready-to-sign transaction. Wallet developers and agents that already hold keys can request quotes with no account, and an optional MCP server exposes the same flow to desktop assistants. The service only builds the transaction: you still pay gas and bear slippage, unsupported chains are rejected, and a per-IP rate limit applies.
At a glance
Research onlyOur rating, based on popularity, maintenance and how ready it is for real use.
| Best for | Developers |
|---|---|
| Used for | Data source, Live trading |
| Markets | Crypto |
| Stack | Python |
| Learning curve | Easy to start |
| Practical value | Medium practical value |
| Cost | Free and open source |
| Hardware | No GPU needed |
| Maintenance | No commits in over six months |
GitHub stars, last 30 days
Daily snapshots since 2026-09-28 (up to 30 days): 0 over the period, now 22. Gaps mean no snapshot was taken that day.
Free DEX aggregator API returning executable swap calldata across 46 EVM chains. No API key required.
Similar tools
Free, open-source crypto trading bot written in Python
Open source Python crypto trading bot with visual interface
Advanced crypto trading framework for backtesting and live trading
Unified crypto OHLC candles from seven exchanges into pandas
Julia modules for spot and futures crypto venue data
On-chain pool, swap and token candle data