In this guide
Key takeaway: Liquidity stands as the cornerstone for prediction market participants. Abundant liquidity translates to compressed spreads, rapid order execution, and fair pricing mechanisms. Polymarket dominates the landscape with $1.5B+ in total traded volume; rival venues typically command substantially lower liquidity pools.
Prediction market liquidity shapes your entire trading journey — influencing execution prices and your capacity to unwind positions swiftly. Yet newcomers often prioritise available markets over liquidity depth. This article clarifies why liquidity supersedes all other considerations.
What is liquidity?
Within financial markets, liquidity refers to the ease with which you can acquire or dispose of an asset without materially altering its price. For prediction markets, liquidity comprises three distinct elements:
- Depth: Quantity of shares accessible at successive price tiers within the order book
- Spread: The distance separating the highest purchase offer and lowest sale offer
- Volume: Total share quantity exchanged during a specified timeframe
A market displaying 10,000 shares offered at 48 cents and 10,000 shares requested at 50 cents exhibits strong liquidity. Conversely, a market with merely 50 shares on each side separated by a 10-cent gap demonstrates poor liquidity.
Why liquidity matters for traders
Insufficient liquidity erodes your returns through multiple channels:
- Wider spreads: Transaction costs rise when entering and closing trades
- Slippage: Substantial orders push pricing unfavourably for your position
- Trapped positions: Absence of willing buyers prevents exit prior to market settlement
- Price inaccuracy: Sparse trading environments yield prices disconnected from genuine probabilities
How to measure prediction market liquidity
Examine these metrics before committing capital:
- Order book depth: PolyGram's depth visualisation tool displays bid and ask concentrations clearly
- 24h volume: Elevated activity signals robust participation — improving fill probability
- Number of unique traders: Markets hosting 100+ distinct participants typically provide adequate liquidity for standard retail positions
- Spread percentage: Target markets where spreads remain beneath 3 cents (3%) for economical execution
Which platforms have the most liquidity?
| Platform | Cumulative volume | Avg. spread |
| Polymarket | $1.5B+ | 1-3 cents |
| Kalshi | $500M+ | 2-5 cents |
| Betfair Exchange | N/A (sports-focused) | 1-2% on sports |
| Augur/Azuro | $50M+ | 5-15 cents |
How market makers create liquidity
Institutional liquidity providers deploy paired buy-sell orders simultaneously, capturing spread differentials whilst furnishing depth to the broader trading community. Polymarket compensates market makers through fee reductions and MATIC incentive schemes. PolyGram's proprietary liquidity engine replicates Polymarket's order flow, guaranteeing PolyGram participants access identical depth as those trading directly on Polymarket.
Tips for trading illiquid markets
- Deploy limit orders exclusively — refrain from market orders in sparse trading environments
- Distribute sizeable orders across multiple price points
- Exercise restraint: establish your target price and await execution rather than accepting unfavourable fills
- Evaluate timing dynamics — sparse markets frequently gain liquidity approaching resolution dates
Trade on the most liquid prediction market platform. Start trading on PolyGram →