> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://okx-demo.ferndocs.com/docs/resources/changelog/2025/7/31/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://okx-demo.ferndocs.com/_mcp/server.

## Market data

* Added `GET /api/v5/public/instrument-tick-bands` returning per-price-band tick
  sizes for options instrument families.
* The public `instruments` channel now includes the `maxMktSz` and `maxLmtSz`
  fields inline, removing the need for a separate lookup when validating order
  sizes.

> **Warning**
>
> **Deprecation.** The `GET /api/v5/market/oracle` endpoint is deprecated. Use
> `GET /api/v5/market/index-components` and `GET /api/v5/market/index-tickers` for
> index pricing data.