Definition
24h volume
Total notional traded in the last 24 hours.
Definition
24h volume is the total notional traded in a market during the previous 24-hour window. On Polymarket this is calculated as the sum of traded notional (in pUSD) across all fills for a market's outcomes over the last 24 hours.
In context
You most often see 24h volume used as a sort key when browsing or filtering markets. High 24h volume usually indicates recent activity and tighter spreads, while low 24h volume often signals illiquidity and wider spreads. On Polymarket, lists and rankings that expose volume24hr let you surface markets with the most recent trading interest.
Because 24h volume measures past activity, it is a descriptive metric rather than a predictive one. Traders use it to choose markets that are likely to have better execution and faster fills, but volume alone does not guarantee narrow spreads or execution quality.
How it's reported
Polymarket exposes 24h volume through its Gamma and Data APIs. In UI lists it commonly appears as volume24hr and is expressed in pUSD (Polymarket's wrapped USDC). When combining 24h volume with other filters—like tag_id or order—the API respects the same rate limits and pagination rules as other endpoints.
See also
- /glossary/liquidity