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L3 is the order-level book on Lighter: every resting order shown individually, each with its order index, owner account index, price, and size, rather than the aggregated price levels of L2. L3 is a Lighter family surface. Lighter exposes individual orders where Hyperliquid families expose L4; the two are different reconstructions, so do not treat a Lighter L3 route as interchangeable with a Hyperliquid L4 route. Reach for L3 when you need queue position, per-order size, or order-level microstructure on Lighter, and use L2 when aggregated levels are enough.

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Get an L3 snapshot

L3 is served only on Lighter. Find symbols on /v1/lighter/instruments.
For aggregated price-level depth on Lighter, use the L2 routes (/v1/lighter/orderbook/{symbol} and /history) covered on L2 order book. L3 is order-level; L2 is the levels those orders aggregate into.

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Request parameters

L3 is available on every tier, including Free. Begin with one bounded start/end window, paginate with cursor, and store meta.request_id per page.

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Example response

The L3 snapshot returns the { success, data, meta } envelope. data is a single book object, not an array. Each entry under data.orders is one resting order:
Per-order fields: order_index (the Lighter order identifier), owner_account_index, side (bid or ask), price, remaining_size, and original_size, all as JSON numbers. owner_account_index is a Lighter account index, an integer account id on the Lighter exchange. It is not a wallet address; do not treat it like the user_address wallet field on Hyperliquid L4. Alongside orders, the book object carries bid_count, ask_count, total_bid_size, total_ask_size, mid_price, spread, and spread_bps. Capture a live fixture and pin the order_index, owner_account_index, price, and size fields you depend on before binding stable models. The Endpoint reference carries the route metadata, and full field meanings live in the field dictionary.

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Stream it live

Lighter streams the order-level book on the lighter_l3_orderbook channel. For sequence and gap handling on long live runs, see WebSocket replay.
The full channel matrix is on WebSocket channels.

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Export in bulk

L3 books export as the l3_orderbook schema ($6/GB, $10 minimum), delivered as Parquet with ZSTD compression. Keep L2, L3, and L4 in separate tables. Build a selection in the Data catalog; columns and coverage keys are on Export schemas.

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Other depths

L2 order book

Aggregated price levels (px, sz, n) across every venue family.

L4 order book

Every resting order with its oid and user_address on Hyperliquid families, plus diffs and reconstruction.

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Next

Start from Order books for the depth overview, Order book depth to choose a grain, Lighter REST API for the wider Lighter route set, or Data quality before any long historical window.
Last modified on July 27, 2026