In this guide
Market depth stands as the paramount consideration when executing trades on prediction platforms. Markets with strong liquidity allow you to open and close positions at competitive rates; those lacking liquidity can inflict substantial costs through unfavourable spreads before any outcome is determined.
What Is Liquidity in Prediction Markets?
Liquidity describes how readily you can transact shares without materially shifting the price. A prediction market with robust liquidity exhibits:
- Narrow bid-ask spread (buy and sell quotes in close proximity)
- Substantial order book (numerous orders distributed across price tiers)
- Elevated recent transaction activity
- Numerous engaged traders supporting both outcomes
Signs of a Liquid Market
- Spread under 2 cents: YES quoted at 0.65 bid / 0.67 ask represents a 2-cent spread — exceptionally narrow by prediction market standards
- Large open interest: Hundreds or thousands of pounds in unresolved YES and NO commitments
- Recent trades: Most recent transaction occurred within minutes (rather than hours or days)
- Volume over $10,000: Markets demonstrating substantial daily turnover typically maintain sufficient liquidity for standard trade sizes
Impact on Your Trading
Within a market showing a 5-cent spread, you incur a 5-cent per share expense immediately upon entry — independent of subsequent price shifts. A 1-cent spread market reduces this friction by approximately 80%. Across numerous transactions, such savings accumulate substantially.
Illustration: You acquire 1,000 YES shares comparing a 5-cent spread market against a 1-cent spread market:
- 5-cent spread: upfront expense £50 (spread-related cost alone)
- 1-cent spread: upfront expense £10
- Monthly trading across 20 markets annually: £960 versus £192
Where to Find the Most Liquid Prediction Markets
The deepest prediction markets available through PolyGram include:
- Prominent American political contests (presidential races, legislative majorities)
- Cryptocurrency benchmarks for Bitcoin and Ethereum
- American football championship and professional basketball finals (seasonal periods)
- Central bank monetary policy announcement outcomes
- International football tournament victor forecasts (tournament windows)
Sort by transaction volume on PolyGram's platform — this ranking highlights the deepest opportunities first.
FAQ
- Can I trade illiquid markets safely?
- Certainly, though prudence is warranted. Employ limit orders instead of market orders to govern your entry price precisely. Refrain from committing capital to positions you cannot profitably unwind given prevailing spreads.
- How does liquidity change over a market's life?
- Typically, newly launched markets exhibit thin liquidity, improving as the resolution date approaches and trader participation rises. The period immediately preceding major event outcomes frequently witnesses maximum liquidity.
- Does PolyGram have the same liquidity as Polymarket?
- Correct — PolyGram connects to identical Polymarket CLOB infrastructure, ensuring equivalent order book depth.