Polymarket’s Dirty Secret: ‘No’ Wins 73% of the Time
Polymarket's own accuracy page shows 73.3% of resolved markets settle as 'No' — a structural tilt that rewards patient, diversified positioning over hero bets.
In Brief
- Polymarket’s own accuracy page shows 73.3% of resolved markets settle as “No” against 26.7% “Yes.”
- A 2,321-market audit of the Gamma API found 54.2% resolved “No,” with crypto at 66% and sports near a coin flip.
- Duration is the hidden variable: markets open 90–180 days resolve “No” 73.5% of the time, matching the official rate.
Here is the quiet math behind every Polymarket bet: “No” usually wins. The platform’s own accuracy page reports that 73.3% of all resolved markets settle as “No,” against just 26.7% for “Yes.”
That tilt is not a glitch. It is structural, and traders who ignore it leave money on the table.
What the prediction market “No” bias means
The logic is simple. There are usually more ways for something not to happen than to happen in one exact way — Polymarket’s own FAQ uses that phrasing to explain the skew. Betting “Yes” on a specific outcome requires the world to line up precisely; “No” wins if anything goes sideways.
An independent audit of 2,321 closed markets pulled from the Gamma API found 54.2% resolved “No.” The gap with the official 73.3% is a sampling artifact: the API leans toward recent, short, sports-heavy markets, which resolve “No” less often. Prediction markets just cleared $50 billion in monthly World Cup volume, CoinDesk reported, showing how dominant sports contracts have become.
Break it down by category and the pattern sharpens. Crypto markets resolved “No” 66% of the time, art 77.4%, and US current affairs 59.2%, while sports sat near 52.3% — barely above a coin flip. About 60% of World Cup bettors were first-time onchain users, Cointelegraph reported, a reminder that retail flows into exactly these short markets. The platform itself now faces a CFTC probe over influencer videos, Cointelegraph reported.
How to actually use the bias
Market age is the lever. The same audit found markets open 90–180 days resolved “No” 73.5% of the time — almost exactly the official figure — while markets under 30 days landed at 52.1%.
That means the “No” edge is strongest on slow, contested markets and weakest on fast sports lines. A blanket “always bet No” strategy would have lost money on the sportsbook-style contracts that dominate World Cup volume, and a Polymarket whale shows how violently those can swing.
For a disciplined trader, the takeaway is not to ape the bias but to price it in. Weather-market specialists who survive long streaks do exactly that — small, consistent stakes that outlast variance rather than chase the obvious “No,” and a $345 million Iran deal shows how a single narrative can dominate a market.
FAQ
What percentage of Polymarket markets resolve “No”?
Polymarket’s accuracy page reports 73.3% of resolved markets settle as “No.” A 2,321-market Gamma API audit found 54.2%, with the difference driven by sampling bias toward short, sports-heavy markets.
Which categories resolve “No” most often?
In the audit, art markets hit 77.4% “No,” crypto 66%, and US current affairs 59.2%, while sports were near 52.3% — close to a coin flip.
Does “always bet No” work?
No. The bias is strongest on markets open 90–180 days (73.5% “No”) and weakest on sub-30-day sports lines (52.1%). Blanket “No” betting loses on fast contracts.
