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## 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.