# Page Not Found

The URL `announcement/announcement-on-mdex-launches-usdt-` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Announcement on 2nd halving of MDX](https://mdexdoc.gitbook.io/doc/announcement/announcement-on-2nd-halving-of-mdx.md)
- [Announcement on 4th halving of MDX](https://mdexdoc.gitbook.io/doc/announcement/announcement-on-4th-halving-of-mdx.md)
- [Announcement on MDEX launches USDT-margined perpetual trading feature](https://mdexdoc.gitbook.io/doc/announcement/announcement-on-mdex-launches-usdt-margined-perpetual-trading-feature.md)
- [Announcement on MDEX’s deployment on Ethereum Network](https://mdexdoc.gitbook.io/doc/announcement/announcement-on-mdexs-deployment-on-ethereum-network.md)
- [Announcement on UI upgrade of MDEX official website](https://mdexdoc.gitbook.io/doc/announcement/announcement-on-ui-upgrade-of-mdex-official-website.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://mdexdoc.gitbook.io/doc/announcement/announcement-on-2nd-halving-of-mdx.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://mdexdoc.gitbook.io/doc/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://mdexdoc.gitbook.io/doc/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/doc/announcement/announcement-on-2nd-halving-of-mdx.md`).

You may also use `Accept: text/markdown` header for content negotiation.