The numbers are in, and they don’t seem to be fairly for on a regular basis merchants who wager on prediction markets.
Regardless of dealing with tens of billions of {dollars} in trades, these platforms seem like leaving the overwhelming majority of customers worse off financially.
Prediction markets have grown quick. By 2025, platforms like Polymarket and Kalshi had been processing $28 billion in buying and selling quantity.
The thought behind them is straightforward: folks wager on future occasions, and the percentages that kind are presupposed to replicate what the general public genuinely believes will occur.
Supporters have referred to as them highly effective instruments for forecasting. However a more in-depth have a look at who truly makes cash tells a really completely different story.
A congresswoman raises the alarm
Arizona Democrat Yassamin Ansari lately focused each Polymarket and Kalshi, calling them “casinos the place the wealthy and highly effective are the home and everybody else is the chips.”
She posted on X that 99.96% of customers lose the whole lot whereas the highest 0.04% stroll away with billions.
Supply: @RepYassAnsari
Her declare comes from a December 2025 on-chain evaluation by a blockchain researcher often called DeFi Oasis.
That research discovered that lower than 0.04% of Polymarket pockets addresses captured greater than 70% of all realized income, totaling $3.7 billion.
Analysts, nevertheless, identified that Ansari’s wording mixes up two separate figures. The 0.04% refers to who captured a lot of the winnings, not merely who gained something in any respect.
Ansari is co-sponsoring a invoice referred to as the BETS OFF Act alongside Sen. Chris Murphy of Connecticut and Reps. Greg Casar and Rashida Tlaib of Texas and Michigan, respectively. The invoice would ban betting on occasions like conflict, terrorism, assassination, and authorities choices.
Regardless of the precise interpretation of the 0.04% determine, newer knowledge places the issue in sharper focus.
Analysis printed in April 2026 by analyst Andrey Sergeenkov discovered that 84.1% of Polymarket merchants haven’t made a revenue. Meaning fewer than one in six customers is definitely within the inexperienced. Two years in the past, round 40% of merchants had been worthwhile.
The sharp drop, based on Sergeenkov, is tied to a flood of recent and inexperienced customers drawn in by the excitement across the November 2024 U.S. presidential election. “Much less skilled customers are likely to commerce much less efficiently,” he famous.
The 84.1% determine can also be greater than what a 2025 research from researchers Felix Reichenbach and Martin Walther discovered.
Their paper put the shedding share at round 70%. The distinction, Sergeenkov explains, comes all the way down to how the maths is finished.
His technique accounts for pockets splits and merges, which earlier analyses disregarded. “When splits are disregarded, an deal with seems to be extra worthwhile as a result of one class of bills is solely invisible,” he stated.
The numbers behind the losses
A deeper have a look at the information exhibits simply how uncommon significant earnings are on these platforms. Of two.5 million wallets studied, solely 2% had ever made greater than $1,000 in complete. Simply 0.32% had cleared $10,000, and solely 840 wallets, that’s 0.033%, had earned greater than $100,000.
The typical commerce on Polymarket is $89, and 80% of merchants by no means place a wager bigger than $500 on common.
The thought of changing a daily paycheck by means of buying and selling seems nearly out of attain. The typical month-to-month wage in america is roughly $5,000. Solely 0.98% of merchants ever hit that mark in a single month.
The quantity who managed it for 12 months straight: simply 35 out of two.5 million folks.
The findings carry weight at a time when main monetary establishments have moved in.
The Intercontinental Change, which owns the New York Inventory Change, accomplished a $2 billion take care of Polymarket in March. Kalshi lately raised $1 billion, pushing its valuation to $22 billion.
The BETS OFF Act and a separate invoice referred to as the Dying Bets Act, launched by Rep. Mike Levin, should not broadly anticipated to go within the present Congress. Nonetheless, observers say the push for stronger protections for on a regular basis customers shouldn’t be going away.
