# Order books

> HyperCore private-preview documentation.

> For the complete documentation index, see [llms.txt](/docs/llms.txt).

<Callout intent="info">
  This API is in private preview. Endpoint availability and response schemas may change before general availability.
</Callout>


# Order books

L2 aggregates resting liquidity by price. L2 diffs modify a compatible snapshot. L4 exposes order-by-order state. Clients must apply ordered diffs, detect gaps, and backfill before trusting local state.