Polymarket Ends Free Era, Introduces Dynamic Fee Model Across Most Markets

Article by Kabuda, Shenchao TechFlow

In the 2024 U.S. election, Polymarket rose to prominence with zero fees and $3.3 billion in presidential election bets, becoming the global synonym for prediction markets.

One and a half years later, the company decided to charge everyone.

Starting March 30, Polymarket is expanding taker fees to nearly all trading categories—including politics, finance, economics, culture, weather, and technology. Previously, fees applied only to crypto and sports contracts. After this expansion, the only remaining fee-free category is geopolitics.

The free lunch is over.

Polymarket does not use a traditional fixed commission model; instead, it employs a "dynamic probability pricing" mechanism where fees fluctuate based on the contract's win probability. Fees are highest when the probability is closest to 50%—indicating maximum market uncertainty—and approach zero as the outcome becomes nearly certain (probability approaching 0% or 100%).

Peak fees for each category:

• Crypto contract: 1.80% (increased from the previous 1.56%)
• Economy: 1.50%
• Culture/Weather: 1.25%
• Politics/Finance/Technology: 1.00%
• Sports: 0.75% (increased from the previous 0.44%)
• Geopolitical: 0% (the only free category)

For example, a $50 sports contract with a 50/50 probability sees the fee increase from $0.22 to $0.38. Crypto contracts experience even larger increases, directly squeezing the real profits of high-frequency traders.

Meanwhile, Polymarket has launched the Maker rebate program, where all fees are not platform profits but are returned daily to liquidity providers (makers) in USDC. Rebate rates vary by category, reaching up to 50% for financial markets and 25% for sports. The logic is clear: charge retail traders (takers) and subsidize makers, using fees to drive the liquidity flywheel.

The answer is hidden in three numbers.

First, Polymarket’s trading volume over the past 30 days has been approximately $9.55 billion. Based on the estimated blended effective fee rate under the new structure, the platform’s daily revenue could reach $800,000 to $1 million, or about $300 million annually. For a company without a stable revenue model, this represents a foundational level of financial sustainability.

Second, ICE, the parent company of the New York Stock Exchange, has just fulfilled its total investment commitment of approximately $2 billion in Polymarket. The first tranche of $1 billion was paid in October 2025, followed by an additional $600 million in cash plus up to $40 million in secondary share purchases in March 2026. At the time the deal was signed, Polymarket was valued at around $8 billion; the platform is now reportedly raising new funding at a valuation nearing $20 billion. With such a large influx of capital, investors are now looking for revenue.

Third, competitor Kalshi is already charging fees, generating an annual revenue of $1.5 billion and reaching a valuation of $22 billion. If Polymarket continues to remain free, it’s essentially using its own free traffic to benefit its competitor—you’re educating users for free, only for them to migrate to paid platforms with deeper liquidity.

Another important context: Polymarket has just signed an exclusive multi-year partnership with MLB, reportedly worth up to $300 million, following previous deals with the NHL, MLS, and UFC. Securing partnerships with professional sports leagues means the platform must operate commercially—you can’t shake hands with major leagues while telling investors, “We haven’t figured out how to make money yet.”

Polymarket chose a subtle time to implement fees.

One week before the fee expansion, California Democratic Senator Adam Schiff and Utah Republican Senator John Curtis jointly introduced the Prediction Markets Are Gambling Act, which calls for banning any prediction contracts related to sporting events on CFTC-registered trading platforms.

Schiff put it plainly: "Sports prediction contracts are just sports betting with a different name."

Curtis’s concern is more specific: Utah’s constitution prohibits all forms of gambling, yet Polymarket and Kalshi’s prediction contracts operate freely across all 50 U.S. states, bypassing state-level regulations entirely.

This is not an isolated case. In the same week, Oregon Democratic Senator Jeff Merkley introduced the more aggressive STOP Corrupt Bets Act, which seeks to ban prediction contracts not only on sports but also on elections, government actions, and military operations. The Attorney General of Arizona has already filed criminal charges against Kalshi, accusing it of operating an unlicensed gambling business. Courts in Nevada have issued temporary injunctions against Kalshi and similar rulings against Polymarket.

Multiple legislative initiatives are advancing simultaneously, as the prediction market industry faces its most intense regulatory push since its inception.

However, the market is not currently very concerned. Contracts on Polymarket regarding whether a bill banning sports prediction markets will pass in 2026 show only a 9.5% probability of passage. Such bills must navigate committee hearings, votes in both chambers, and presidential signing—and with the current Congress’s packed agenda, the likelihood of enactment is extremely low.

Beyond fee disputes, Polymarket faces a more serious issue: allegations of market manipulation and insider trading have never ceased.

In January, a newly created account placed precise bets just before the arrest of Venezuelan President Maduro, netting over $400,000. In March, before the coordinated U.S. and Israeli strikes on Iran, the on-chain analytics firm Bubblemaps detected six newly created wallets collectively profiting $1.2 million within hours through related smart contracts. Israeli authorities even arrested two individuals suspected of using classified military intelligence to place bets on prediction markets.

Previously, the market asking "Did Ukraine agree to Trump's mineral deal?"—with a trading volume exceeding $7 million—was forcibly resolved as "Yes" without any official confirmation, sparking widespread user protests. Some users directly called it "Polyscam" on social media.

User Folke Hermansen detailed multiple manipulation cases on X, alleging that Polymarket’s rulings rely on a UMA token voting mechanism, with two whales controlling over half of the voting power—one address holding 7.5 million out of 20 million UMA tokens. Regular users have no means to challenge the rulings.

In response, Polymarket launched its "Enhanced Market Integrity Rules," explicitly prohibiting trading based on stolen confidential information, building positions using insider information, and participation in trades by parties capable of influencing outcomes. The platform also announced a partnership with Palantir and TWG AI to build a market monitoring system.

Are these measures enough? Senator Schiff provided the answer in his CNBC interview: “It’s not enough to just say, ‘This is our policy’—what matters is whether you have actual mechanisms in place to implement it.”

Putting all the pieces together, Polymarket’s situation is like a classic startup equation:

ICE has invested nearly $2 billion in prediction markets to establish them as a new financial infrastructure. ICE’s CEO Sprecher made it clear on the earnings call that this is not a venture capital play; ICE’s return logic lies in integrating prediction market data into its own workflows to drive data sales revenue. MLB has granted exclusive partnership rights, seeking to leverage prediction markets for user growth. Congress seeks regulatory authority and control over the gambling industry. Users want zero fees and fair adjudication.

Among these requirements, at least two are fundamentally contradictory.

The era of zero fees has attracted users and traffic, but it cannot sustain a company valued at $20 billion. Charging fees can generate revenue, but may drive price-sensitive retail users to competitors. DraftKings has announced it will establish its own prediction market market-making division, while FanDuel has partnered with CME Group to enter the space. The two traditional gambling giants are expected to invest hundreds of millions of dollars in prediction markets by 2026. Meanwhile, if Congress actually passes a sports betting ban, Polymarket’s fastest-growing category will be directly eliminated.

Polymarket made a smart hedge: keeping geopolitical contracts free. This upholds the platform’s positioning as a “public forecasting tool” and sends a message to Congress that we are not just a gambling platform—we provide valuable collective wisdom.

But the boundary between "valuable collective wisdom" and "gambling" has never been determined by technical architecture—it has always been shaped by political dynamics.

The contracts on Polymarket themselves provide the answer: the probability of the ban passing is less than 10%. Then again, trusting Polymarket’s contracts to judge Polymarket’s fate is itself an interesting recursive question.