Latest prices for any market (generic by ident)

Baseurl: https://www.steamwebapi.com/market/{market}/prices?key=YOUR_API_KEY

**This is a premium endpoint.**
- Requires Items access in your package (same rate limits as `/steam/api/items`).
- Replace `{market}` with the market ident (e.g. `buff`, `csfloat`, `youpin`, `skinport`).
- Returns the freshest prices from the most recent scrape run for that market.
- Prices are returned in USD by default; pass `currency` to convert.

**Parameters:**
- **`key`**: Your API key (required).
- **`market_hash_name`**: Filter to a single item (optional).
- **`currency`**: Convert prices (optional, default USD).