> ## Documentation Index
> Fetch the complete documentation index at: https://docs.o1.exchange/llms.txt
> Use this file to discover all available pages before exploring further.

# Changelog

> Notable API changes for the DEX Aggregator API.

This page tracks user-visible changes to the DEX Aggregator API. Breaking changes are flagged explicitly.

## 2026-04-30 — Public docs published

* Initial public documentation for the DEX Aggregator API at `docs.o1.exchange/api/dex-aggregator`.
* Endpoints: `/quote`, `/submit`, `/execute`, `/health`.
* Live on Base mainnet (chain ID `8453`).
* Default rate limit: 120 requests / minute / API key.
* Router contract: [`0x8Dc736C6BA12e1Df1c73DB6BED8d7573F0aD90B3`](https://basescan.org/address/0x8Dc736C6BA12e1Df1c73DB6BED8d7573F0aD90B3).

## Versioning policy

The API does not use a versioned URL prefix today. We treat published behavior as stable and add fields additively whenever possible. Breaking changes will be:

1. Pre-announced here at least two weeks before deployment.
2. Mirrored at a versioned path (`/v1/quote`, `/v2/quote`) for the duration of the migration window.
3. Documented with a migration note describing the old and new shapes.

## What "breaking" means

* Removing or renaming a field on a response.
* Changing the type or units of an existing field.
* Tightening a validation rule that previously accepted a value.
* Removing or renaming an endpoint.

Adding new optional request fields, new optional response fields, or new endpoints is **not** breaking.

## Subscribing to updates

If you'd like change notifications, contact the o1 team to be added to an integrator mailing list. The changelog page here is the canonical record either way.