Where to Find 0x Documentation

The 0x Docs are the source of truth

For anything technical — integrating an API, checking supported chains, understanding order types, handling errors, or staying within rate limits — the complete and current information lives in the 0x Docs. The docs are maintained continuously, with a public changelog showing recent updates (the most recent highlights run through May 2026). When the Help Centre and the docs differ, trust the docs.

This article is a map to the sections you'll use most.

Getting started

New to 0x? Start here:

• Create a 0x API Key

• Swap Tokens with Swap API

• Supported Chains and Providers

The APIs

0x covers EVM chains, Solana, and Cross-chain swaps:

• EVM Swap API

• Solana Swap API

• Cross-Chain API

• Gasless API

• Trade Analytics API

Core concepts

For how the system actually works — useful when a trade behaves differently than expected:

• Order Types

• 0x Cheat Sheet

• Contracts

• Glossary

Rate limits, errors, and status

When requests get rejected or you're tuning throughput:

• Rate Limits

• API Issues & Error Codes

• System Status — real-time uptime and incidents

Upgrading API versions

Note these are about API versions, not account plans:

• Upgrading Overview

• Upgrading to Swap API v2

• Upgrading to Gasless API v2

Managing your account and keys

Account-level tasks happen in the 0x Dashboard: create and find API keys, monitor usage, and manage your plan.

Building with AI

0x publishes AI-specific resources, including an Agent Skill and MCP setup. The docs also expose a machine-readable index — append /llms.txt to any docs URL for a page index, or .md to any page for its markdown version.

• Using AI with 0x

Still need help?

If the docs don't resolve it, see the FAQ or contact 0x Developer Support.