> 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/2026/6/18/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://okx-demo.ferndocs.com/_mcp/server.

## Spread trading and block trading

* Added `GET /api/v5/sprd/order-algo-history` to retrieve completed algo
  spread orders (TWAP) alongside the existing `GET /api/v5/sprd/order-algo`
  active-order query.
* Added the `pxUsd` and `pxVol` fields to block trade RFQ quote responses on
  `GET /api/v5/rfq/quotes`, enabling options quotes to be expressed in USD price
  or implied volatility.
* New WebSocket channel `sprd-orders-algo` streams real-time state transitions
  for spread algo orders on the private channel.