On 8 November 2026, Polymarket's Gamma API listed 19,636 open events with about $66M traded in the previous 24 hours, $255M in 7 days and $533M in 30 days, and about $295M of open interest. Nimb's map covers the 313 most active of them, which together carried $161.6M in 7 days as of 8 November 2026, 18:00 UTC: a few hundred events hold most of the money.
How big is Polymarket?
Nimb's own count, summing the fields Polymarket publishes for every event that was open (active=true&closed=false) on 8 November 2026:
| Measure | Value | Field |
|---|---|---|
| Open events | 19,636 | count |
| Traded, 24 hours | $65.9M | volume24hr |
| Traded, 7 days | $254.9M | volume1wk |
| Traded, 30 days | $532.5M | volume1mo |
| Lifetime volume of the open events | $5.75B | volume |
| Open interest | $295.3M | openInterest |
| Order-book liquidity | $666.3M | liquidity |
Read these with care. Many open events are short crypto and sports markets that open and settle within hours. Volume counts the value of matched trades as Polymarket reports it; methods differ between data providers (some count both sides of a trade, some only the taker), so totals from different sources rarely match. Events that closed in the period are not in this sum, so it understates the period's total trading. To repeat the count, page through /events/keyset as described in the Polymarket API guide.
Polymarket volume by category
On the 313 events on Nimb's map, as of 8 November 2026, 18:00 UTC, Politics carried the most money: 40% of the 7-day total. Categories are Nimb's own (how they work).
| Category | Events | Markets | Traded, 24h | Traded, 7 days | Share, 7 days |
|---|---|---|---|---|---|
| Geopolitics | 53 | 153 | $3.1M | $23.6M | 15% |
| Politics | 44 | 117 | $3.2M | $64.2M | 40% |
| Finance | 37 | 118 | $1.3M | $18.7M | 12% |
| Crypto | 14 | 66 | $1.1M | $10.2M | 6% |
| AI & Tech | 11 | 43 | $162k | $1.2M | 1% |
| Climate & Culture | 17 | 61 | $699k | $2.1M | 1% |
| Sports | 137 | 503 | $27.3M | $41.6M | 26% |
| All | 313 | 1061 | $36.8M | $161.6M | 100% |
Updated every 6 hours on Polymarket analytics.
How concentrated is the money?
Very. The 313 events on Nimb are under 1% of open events by count but, at $161.6M in 7 days, roughly half of the 7-day volume summed above. Within a market, holdings are concentrated too: the 10 largest wallets Nimb tracks hold 18% of the value of all tracked positions (largest holders). For a trader, this means total platform volume says little about a given market: check that market's spread and depth.
How big is the prediction market industry?
Two venues dominate in 2026: Polymarket and Kalshi. Third-party trackers reported that Kalshi's monthly volume passed Polymarket's at times during 2026, and that crypto-native venues such as Opinion briefly took a large share of weekly volume in early 2026. Totals depend heavily on method, so compare like with like, from the same tracker. Kalshi publishes its own market data through its API.
Money has followed the volume. Intercontinental Exchange, the owner of the New York Stock Exchange, invested in Polymarket from October 2025, and reported 2026 rounds valued Polymarket at around $15–21B and Kalshi at around $22B. See what is Polymarket?
What this cannot tell you
- Volume is not profit and not the number of people. A few market makers can account for much of it.
- Open interest measures money at stake now, not money traded; see volume and open interest.
- A snapshot: these numbers are for one day. Weekly volume swings with elections, sports seasons and crypto prices.
Frequently asked questions
How much volume does Polymarket do per day?
On 8 November 2026, the open events had about $66M traded in the previous 24 hours, by Polymarket's own fields. It varies with the news cycle.
How many markets are on Polymarket?
19,636 events were open on 8 November 2026; many events contain several markets (one per outcome). Nimb shows the 313 most active.
What is Polymarket's open interest?
About $295M across open events on 8 November 2026, summing Gamma's openInterest field.
Where can I see Polymarket statistics for free?
Polymarket's APIs, Nimb's analytics and community dashboards. Nimb's numbers come straight from Polymarket's APIs, with dates.
Last reviewed 8 November 2026 · Data from Polymarket · Not financial advice · Nimb is not affiliated with Polymarket.