# Canonical: https://www.uddalak.xyz/hyperliquid-academy/article/69-spread-slippage-depth-market-impact
# Author: Uddalak Das
# Last source: https://www.uddalak.xyz/hyperliquid-academy/article/69-spread-slippage-depth-market-impact

---
title: "Spread, Slippage, Depth, and Market Impact on Hyperliquid"
description: "Spread measures the gap between best bid and ask, depth measures available liquidity, slippage describes execution versus a reference price, and market impact is the price movement associated with consuming or revealing demand."
pillar: "Trading & Risk"
track: "Trading & Risk"
cluster: "Trading & Risk"
level: "Intermediate"
primary_icp: ["trader", "market maker"]
secondary_icp: ["institutional decision-maker"]
content_type: "concept"
reading_time: "3 min"
last_reviewed: "2026-09-07"
last_verified: "2026-09-07"
volatile: false
prerequisites: ["06-order-book", "17-order-types"]
related: ["95-how-hyperliquid-market-data-is-structured", "104-how-to-read-hyperliquid-l2-order-book", "106-how-to-measure-slippage-and-market-impact"]
---

# Spread, Slippage, Depth, and Market Impact on Hyperliquid

Four liquidity terms are often used interchangeably even though they measure different things. Spread tells you the immediate quoted gap. Depth tells you how much size is available at different prices. Slippage measures how your execution differs from a chosen benchmark. Market impact describes how the market moves as a consequence of trading. You need all four to understand execution quality on Hyperliquid.

## Spread

If the best bid is $99.99 and the best ask is $100.01, the quoted spread is $0.02. A tight spread is useful, but it says almost nothing about how much size is available.

A market can show a one-basis-point spread with only a small order at the top level and become expensive for larger trades.

## Depth

Depth is the cumulative quantity resting across price levels. The L2 book lets you inspect multiple levels on each side and estimate how far a market order would need to walk for a given size.

Depth should be measured in notional at useful basis-point bands, not only as a count of orders. One large displayed order and many tiny orders can produce similar order counts but very different execution capacity.

## Slippage

Slippage requires a benchmark. You can compare average execution price with the midpoint before the order, the decision price when the strategy generated the trade, or another reference.

A market order that fills exactly as the visible book predicted can still show slippage versus the midpoint. That is not necessarily a failure. It is the cost of demanding immediacy.

## Market impact

Your order can remove liquidity, signal information, or trigger other traders to reprice. The resulting price change can persist after the execution. This is market impact and becomes increasingly important as size grows relative to normal depth and volume.

Large traders should estimate both instantaneous impact and post-trade impact rather than relying on the current top-of-book spread.

## Practical measurement

Capture a book snapshot before execution, the complete set of fills, and prices after the trade at defined horizons. Calculate volume-weighted average price, slippage from the selected benchmark, and post-trade mark-outs.

These measurements turn “the market felt illiquid” into data that can inform order type, slicing, timing, and maximum position size.

## How this connects

Start with [How an Onchain Order Book Works](/hyperliquid-academy/article/06-order-book), [Hyperliquid Order Types Explained](/hyperliquid-academy/article/17-order-types) if the underlying concept is unfamiliar. Related reading: [How Hyperliquid Market Data Is Structured](/hyperliquid-academy/article/95-how-hyperliquid-market-data-is-structured), [How to Read Hyperliquid's L2 Order Book](/hyperliquid-academy/article/104-how-to-read-hyperliquid-l2-order-book), [How to Measure Slippage and Market Impact on Hyperliquid](/hyperliquid-academy/article/106-how-to-measure-slippage-and-market-impact).

## Sources

- https://hyperliquid.gitbook.io/hyperliquid-docs/for-developers/api/info-endpoint
- https://hyperliquid.gitbook.io/hyperliquid-docs/trading/market-making