Volume, last day
USDCollateral value of trades matched on the latest complete UTC day, counted once per match from the taker's fill.
Dashboard · VantagePlanned
Polymarket Volume and Open Interest Tracker
How much is traded on Polymarket each day, and how much collateral is locked in open positions?
Polymarket's daily trading volume, open interest and active traders, counted once per trade from its contracts on Polygon.
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Blueprint
What the dashboard will show.
The dashboard as it will open in Vantage. Each figure is named here and arrives with its receipt; until its data is published, its place stays empty.
Overview
Volume, open interest and traders on the latest complete day, with their history.
Volume, last 7 days
USDMatched volume summed over the last 7 complete UTC days, on the same once-per-trade count.
Open interest
USDCollateral locked behind outcome shares not yet merged or redeemed, at the latest day's last block.
Active traders
countDistinct wallets that traded as maker or taker on the latest complete day.
Volume by day
USDDaily matched volume over the selected period, counted once per trade, with the day of each contract upgrade marked.
Open interest by day
USDCollateral locked behind open positions at each day's last block over the selected period.
Markets
Which categories and markets draw the trading.
Markets traded
countMarkets with at least one matched trade on the latest complete day.
Largest category's share
%Share of the period's volume traded in its largest market category, such as sports, politics or crypto.
Volume by category
USDDaily volume split by market category, using the categories in Polymarket's public metadata.
Largest markets
Markets ranked by volume over the selected period, with open interest, traders, category and end date.
- Period
- Last 7, 30 or 90 days, or since launch
- Category
- Every market category in Polymarket's metadata
About
What it answers, and for whom.
Polymarket is a prediction market: traders buy and sell shares in the outcomes of real-world questions, and each share pays out one unit of collateral if its outcome happens. Every trade settles on Polygon, so the volume, the collateral behind open positions and the number of traders can all be read from Polymarket's own contracts rather than taken from its website.
This dashboard counts each trade once, from the taker's side, because every match emits a fill event for each side of the trade and adding them all counts the same trade twice. Open interest is the collateral held against positions that have not yet been merged or redeemed. Every figure is pinned to the block it was read at, with the transactions behind it.
Use it to see how busy the market is day to day, which categories draw the most trading and how much money stays committed between a market's opening and its resolution. Polymarket has upgraded its contracts over time, so each series joins every contract version and marks the day of each switch.
Method
How it will be measured.
Every figure will be read at a block, kept with its source and its exact read, and open a receipt anyone can re-check.
How receipts work →- Volume is the collateral value of matched trades from OrderFilled events of Polymarket's exchange contracts on Polygon, counted once per match from the taker's fill; mints, merges and redemptions are not trades and are left out.
- Open interest is the collateral locked behind unredeemed positions: the collateral token balance of Polymarket's position and adapter contracts at each day's last block.
- Active traders are the distinct wallets that appear as maker or taker in a day's fills. One person can control several wallets, so this counts wallets, not people.
- Market questions and categories come from Polymarket's public market metadata, an off-chain label joined to each market's on-chain identifier and recorded with its source.
- Every figure carries a receipt with its block, the time of the read and the contract read or events summed behind it.
The data it needs
Read from chain state and history
- prediction_markets_dailyTo buildPrediction marketsVolume, open interest and traders per prediction market and category per day.
- OrderFilled events of Polymarket's CTF Exchange and NegRisk CTF Exchange on Polygon, and of the exchange contracts that replaced them
- PositionSplit, PositionsMerge and PayoutRedemption events of the ConditionalTokens contract, and their successors in the newer positions contract
- Collateral token balances (USDC.e and Polymarket USD) of the position and adapter contracts at day-end blocks
- Distinct maker and taker wallet addresses in each day's fills
- Market question, category and end date from Polymarket's public market metadata (off-chain labels)
Questions
Questions people ask.
How is Polymarket volume calculated?
Volume adds up the collateral that changed hands in matched trades. Each match emits a fill event for the taker and one for every maker it filled against, so this dashboard counts the taker's side only, which gives each trade once.
What is open interest on Polymarket?
Open interest is the collateral locked behind outcome shares that are still outstanding. When a trader mints a full set of outcome shares, collateral goes into the contract; it leaves when sets are merged back or winning shares are redeemed.
Which blockchain does Polymarket use?
Polymarket settles trades on Polygon PoS. Orders are matched off-chain by its operator and then settled on-chain by its exchange contracts, so every executed trade, mint and redemption is a Polygon transaction anyone can check.
Why do Polymarket volume figures differ between sources?
Sources differ in what they count: some add both sides of every match; some count shares rather than collateral; some include mints and merges. This dashboard states its definition beside each figure, so it can be compared with any other.
Are Polymarket traders anonymous?
Trades come from wallet addresses, usually proxy wallets that Polymarket deploys for each account. The dashboard counts wallets and never tries to identify the people behind them.
- Outcome share
- A token that pays one unit of collateral if its outcome happens and nothing if it does not. Its price reads as the market's implied probability.
- Open interest
- The collateral locked behind outcome shares that have not yet been merged or redeemed.
- Taker
- The side of a trade that crosses the spread and fills against resting orders, which belong to the makers.
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Start free in Voltfin Studio: boards, tables and reports where every number opens its receipt. Tell us which data you need first and we will build it next.