AI & Machine Learning

5 Best APIs for Building a DEX Aggregator in 2026

Ali Nemati7 hours ago55 sec read2 views0 listens

Building a DEX Aggregator Backend: A Comprehensive Guide

Introduction

Decentralized Exchange (DEX) aggregators are essential tools in the DeFi ecosystem. They allow users to trade tokens across multiple decentralized exchanges while optimizing for the best price and lowest fees. This guide provides an overview of how to build a DEX aggregator backend using various APIs, focusing on key considerations such as chain support, API costs, and handling transaction slippage.

Key Components

To build a DEX aggregator backend, you need:

Swap Routing API: Provides executable transaction calldata with gas estimation.
RPC Endpoint: Used to submit transactions on supported chains.
Token List: Contains token addresses for address resolution.

Top APIs for Building a DEX Aggregator

Feature	Swap API	1inch	0x	Velora	Odos
Chains	46	12	~10	8	~14
API key required	No	Yes	Yes

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