# Data Dictionary - Hyperliquid Perp Microstructure - realised vol, spread & slippage, hourly Parquet

**Units:** vary by `metric` - read the per-row `unit` column (overall: mixed).  Times are UTC.

| column | type | description |
|---|---|---|
| `zone` | str | Coin (perp ticker) |
| `ts` | timestamp (UTC) | Hour (bar start) |
| `metric` | str | realized_vol_pct, spread_bps or slippage_bps |
| `value` | float | Metric value. Units: realized_vol_pct=annualised %, spread/slippage=bps |
| `unit` | str | Unit (mixed - see metric) |
| `res_min` | int | Native resolution in minutes (60 = hourly) |

*Source: Hyperliquid (on-chain perpetual DEX) - public asset-context data.*