This is a fundamental problem with the way the platform works. In this article, I explain why Polymarket, with $26 billion in quarterly volume, handed market resolution to the small UMA protocol with a market capitalization of $95 million. I also explain how whales make money from this, why there is nothing you can do about it, and why Ukraine blocked Polymarket back in December 2025.<\/p>\r\n\r\n\r\n\r\n
To put it briefly: I do not recommend treating Polymarket as a serious tool. Details below.<\/p>\r\n\r\n\r\n\r\n
Polymarket: its scale and why it matters<\/h2>\r\n\r\n\r\n\r\n![\"Is](\"https:\/\/lwallet.com.ua\/wp-content\/uploads\/2026\/05\/blog-why-polymarket-is-a-scam-29-05-2026-content-pic2-1024x573.jpg\" "\\"\\"")
<\/figure>\r\n<\/div>\r\n\r\n\r\nPolymarket is currently the world\u2019s largest decentralized prediction market. A few figures to show the scale:<\/p>\r\n\r\n\r\n\r\n
\r\n- $21.5 billion in volume in 2025 and $26.2 billion in the first quarter of 2026 alone.<\/li>\r\n\r\n\r\n\r\n
- $10.57 billion in March 2026 \u2014 the first month in which volume exceeded $10 billion.<\/li>\r\n\r\n\r\n\r\n
- Single-day record: $425 million (February 2026), higher than on the day of Trump\u2019s election in 2024.<\/li>\r\n\r\n\r\n\r\n
- $8 billion valuation after a $2 billion investment from ICE\/NYSE (October 2025).<\/li>\r\n\r\n\r\n\r\n
- 95 million transactions in 2025 and approximately 600,000 active traders.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
Polymarket operates on the Polygon blockchain, and all bets are placed in USDC. One point is critical to this discussion: Polymarket is a non-custodial service. The platform does not hold user funds and does not make decisions about event resolution. This is a deliberate architecture. It emerged after the CFTC issued Polymarket a cease-and-desist order in January 2022 and forced it to pay a $1.4 million fine for operating as an illegal derivatives exchange. The team redesigned the system so that it formally controls nothing: trading runs through smart contracts, while outcomes are decided through the external UMA oracle. Legally, this means: \u201cwe are not an exchange; we are just an interface\u201d.<\/p>\r\n\r\n\r\n\r\n
For users, this means something else: when you bet on \u201cYes\u201d, Polymarket is not the project deciding whether you won. Another project does that. Now let us look at how it works.<\/p>\r\n\r\n\r\n\r\n
What UMA is and where this oracle came from<\/h2>\r\n\r\n\r\n\r\n
Before examining the mechanics, we need some context. UMA (Universal Market Access) is a separate project founded in 2018 by Hart Lambur, a former Goldman Sachs trader. UMA was originally built as a platform for synthetic assets and derivatives, where users could create tokenized versions of Apple shares or the S&P 500 index. The synthetic-assets idea did not take off (Synthetix did it better and earlier), so UMA pivoted to the main product that remained alive: an oracle for real-world data.<\/p>\r\n\r\n\r\n\r\n
Today, UMA Optimistic Oracle serves more than Polymarket. Its clients include Across (a cross-chain bridge), Sherlock (smart-contract insurance), and other DeFi projects. But Polymarket is its largest and most controversial client. Looking at the statistics, the overwhelming majority of disputes in UMA come from Polymarket markets, because this is the only use case in which outcomes are subjective and politically charged.<\/p>\r\n\r\n\r\n\r\n
Polymarket and UMA are legally two different companies, but they are connected. In 2024, Polymarket and UMA announced a partnership with EigenLayer to develop a \u201cnext-generation\u201d oracle based on restaking. Polymarket officially calls UMA its \u201ctrusted oracle\u201d, while UMA officially calls Polymarket its \u201clargest client\u201d. In other words, they are formally independent partners, but without Polymarket, UMA would lose much of its reason to exist. This creates another hidden asymmetry of interests, which I will return to below.<\/p>\r\n\r\n\r\n\r\n
How market resolution works through UMA Optimistic Oracle<\/h2>\r\n\r\n\r\n\r\n![\"UMA](\"https:\/\/lwallet.com.ua\/wp-content\/uploads\/2026\/05\/blog-why-polymarket-is-a-scam-29-05-2026-content-pic3-1024x573.jpg\" "\\"\\"")
<\/figure>\r\n<\/div>\r\n\r\n\r\nUMA\u2019s architecture is called Optimistic Oracle (OO), and it has two levels.<\/p>\r\n\r\n\r\n\r\n
Level 1: optimistic assertion. When a market closes, anyone can propose an outcome (for example, \u201cYes\u201d to the question \u201cWas there a ceasefire?\u201d). To do this, they must post a bond, usually $750 USDC on Polymarket. A two-hour challenge period then begins. If nobody disputes the proposal, the outcome is considered correct, and the proposer receives the bond back plus a small reward. According to UMA statistics, only around 1.5% of proposals are disputed. This is the fast path, and it covers the overwhelming majority of markets.<\/p>\r\n\r\n\r\n\r\n
Level 2: Data Verification Mechanism (DVM). If someone disputes the proposal (also posting $750 USDC), voting begins. This is where the interesting details start.<\/p>\r\n\r\n\r\n\r\n
Only UMA token holders who have staked their tokens can vote. Voting takes place in two stages:<\/p>\r\n\r\n\r\n\r\n
1. Commit phase (24 hours): voters publish a hash of their vote. The actual vote is hidden so that nobody can copy another participant\u2019s decision.<\/p>\r\n\r\n\r\n\r\n
2. Reveal phase (24 hours): voters reveal their votes together with the salt used to generate the hash.<\/p>\r\n\r\n\r\n\r\n
Voting power is proportional to the number of staked UMA tokens. A supermajority of more than 65% is required to make a decision. Those who vote with the majority receive rewards, while those in the minority are slashed (around 0.1% of their stake). The slashing is minor, but it creates a strong psychological effect: smaller voters are afraid of being wrong and vote \u201cwith the crowd\u201d rather than according to reality.<\/p>\r\n\r\n\r\n\r\n
Once voting ends, the result is returned to the Polymarket smart contract, the market closes, and payouts go to the winners. That is it. As Polymarket\u2019s documentation states directly: \u201cOnce finalized by UMA, outcomes are immutable\u201d. Polymarket cannot change the result, even if it wants to.<\/p>\r\n\r\n\r\n\r\n
Now for the key question: who are these voters?<\/p>\r\n\r\n\r\n\r\n
UMA\u2019s structural problem: the numbers do not add up<\/h2>\r\n\r\n\r\n\r\n
This is where the circus begins. Let us look at the numbers.<\/p>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\nParameter<\/strong><\/th>\r\nValue<\/strong><\/th>\r\n<\/tr>\r\n<\/thead>\r\n\r\n\r\nPolymarket monthly volume<\/td>\r\n $10.5 billion (March 2026)<\/td>\r\n<\/tr>\r\n \r\nUMA market capitalization<\/td>\r\n approximately $95 million<\/td>\r\n<\/tr>\r\n \r\nTotal UMA staked<\/td>\r\n approximately 20 million tokens<\/td>\r\n<\/tr>\r\n \r\nTop 10 voters hold<\/td>\r\n approximately 30% of average voting activity<\/td>\r\n<\/tr>\r\n \r\nLargest whales (Hermansen estimate)<\/td>\r\n more than 50% of active voting power<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\nLet that sink in. The platform\u2019s monthly volume is more than 100 times the market capitalization of the project that resolves all disputes on it. When the Zelenskyy suit controversy erupted in July 2025 (more on that below), a single market with $242 million in volume was decided by people holding tokens worth $95 million. Literally, it can be cheaper to buy a share of the voters than to lose the market.<\/p>\r\n\r\n\r\n\r\n
In March 2025, analyst Folke Hermansen examined voting concentration and found that several of the largest whales control more than 50% of active voting power in an average vote. Data from high-profile cases shows that the top 10 stakers account for around 30% of average voting activity \u2014 the fate of most markets is decided by a handful of addresses. For a system marketed as decentralized, this is effectively an oligopoly disguised with language about \u201ctruth-seeking\u201d.<\/p>\r\n\r\n\r\n\r\n
Separately, these whales often trade on Polymarket. They take a $1 million position, then vote in UMA in favor of their own outcome. The conflict of interest is built directly into the system\u2019s architecture. UMA argues that honesty is more profitable because discrediting the system would cause the token price to fall. That is a reasonable theory, but it breaks down in specific cases where a one-off profit on a $7 million market exceeds the expected losses from a falling token price.<\/p>\r\n\r\n\r\n\r\n
And one more thing: only UMA holders can vote. If you enter Polymarket, put down $50,000, and are clearly right on the facts, you still have no influence over the resolution. Completely different people vote \u2014 people who may not trade on the market at all or, more often, trade on the opposite side. This is the fundamental asymmetry behind the entire problem.<\/p>\r\n\r\n
[vc_message color=”warning” message_box_style=”classic” message_box_color=”alert-warning” style=”rounded”]<\/p>\r\n
Only holders of staked UMA tokens can vote in the UMA Data Verification Mechanism. A holder of a USDC position on Polymarket cannot influence the resolution, even if that position is worth one million dollars. This is a fundamental asymmetry of the system.<\/p>\r\n
[\/vc_message]<\/p>\r\n\r\n
Recent case: Russia x Ukraine ceasefire by May 31, 2026 (~$141 million, May 2026)<\/h2>\r\n\r\n\r\n\r\n![\"Russia](\"https:\/\/lwallet.com.ua\/wp-content\/uploads\/2026\/05\/blog-why-polymarket-is-a-scam-29-05-2026-content-pic4-1024x573.jpg\" "\\"\\"")
<\/figure>\r\n<\/div>\r\n\r\n\r\nThe most recent and most revealing case. Let us break it down in detail.<\/p>\r\n\r\n\r\n\r\n
Background.<\/strong> Polymarket had been running a series of markets titled \u201cRussia x Ukraine ceasefire by 2026\u201d for some time. The largest had deadlines of May 31, 2026, and June 30, 2026. The market rules were very clear, and this is not my summary but a direct quote:<\/p>\r\n\r\n\r\n\r\n\u201cThis market will resolve to “Yes” if there is an official ceasefire agreement, defined as a publicly announced and mutually agreed halt in military engagement, between Russia and Ukraine. Only ceasefires which constitute a general pause in the conflict will qualify. Ceasefires which only apply to energy infrastructure, the Black Sea, or other similar agreements will not qualify. Any form of informal agreement will not be considered an official ceasefire. Humanitarian pauses will not count toward the resolution of this market.\u201d<\/p>\r\n\r\n\r\n\r\n
The key point: humanitarian pauses do not count, informal agreements do not count either, and the ceasefire must be a \u201cgeneral pause in the conflict\u201d \u2014 an actual halt to military activity across the entire front.<\/p>\r\n\r\n\r\n\r\n
What happened.<\/strong> On May 8, 2026, Trump announced a three-day ceasefire for May 9\u201311, timed to the May 9 parade in moscow. Both sides described it as a short-term pause, and a 1,000-for-1,000 prisoner exchange was also announced. There was no \u201cgeneral halt to military activity\u201d: it was a symbolic temporary pause.<\/p>\r\n\r\n\r\n\r\nDoes this qualify as a \u201chumanitarian pause\u201d, which the rules explicitly exclude? Yes. Is it an \u201cinformal agreement\u201d without an official treaty? Also yes. Is it a \u201cgeneral pause in the conflict\u201d? Clearly not: on May 12, one day after the \u201cceasefire\u201d ended, the russians launched more than 200 drones at Ukrainian cities. The war continued without any pause.<\/p>\r\n\r\n\r\n\r\n
<\/figure>\r\n<\/div>\r\n\r\n\r\nPolymarket is currently the world\u2019s largest decentralized prediction market. A few figures to show the scale:<\/p>\r\n\r\n\r\n\r\n
- \r\n
- $21.5 billion in volume in 2025 and $26.2 billion in the first quarter of 2026 alone.<\/li>\r\n\r\n\r\n\r\n
- $10.57 billion in March 2026 \u2014 the first month in which volume exceeded $10 billion.<\/li>\r\n\r\n\r\n\r\n
- Single-day record: $425 million (February 2026), higher than on the day of Trump\u2019s election in 2024.<\/li>\r\n\r\n\r\n\r\n
- $8 billion valuation after a $2 billion investment from ICE\/NYSE (October 2025).<\/li>\r\n\r\n\r\n\r\n
- 95 million transactions in 2025 and approximately 600,000 active traders.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
Polymarket operates on the Polygon blockchain, and all bets are placed in USDC. One point is critical to this discussion: Polymarket is a non-custodial service. The platform does not hold user funds and does not make decisions about event resolution. This is a deliberate architecture. It emerged after the CFTC issued Polymarket a cease-and-desist order in January 2022 and forced it to pay a $1.4 million fine for operating as an illegal derivatives exchange. The team redesigned the system so that it formally controls nothing: trading runs through smart contracts, while outcomes are decided through the external UMA oracle. Legally, this means: \u201cwe are not an exchange; we are just an interface\u201d.<\/p>\r\n\r\n\r\n\r\n
For users, this means something else: when you bet on \u201cYes\u201d, Polymarket is not the project deciding whether you won. Another project does that. Now let us look at how it works.<\/p>\r\n\r\n\r\n\r\n
What UMA is and where this oracle came from<\/h2>\r\n\r\n\r\n\r\n
Before examining the mechanics, we need some context. UMA (Universal Market Access) is a separate project founded in 2018 by Hart Lambur, a former Goldman Sachs trader. UMA was originally built as a platform for synthetic assets and derivatives, where users could create tokenized versions of Apple shares or the S&P 500 index. The synthetic-assets idea did not take off (Synthetix did it better and earlier), so UMA pivoted to the main product that remained alive: an oracle for real-world data.<\/p>\r\n\r\n\r\n\r\n
Today, UMA Optimistic Oracle serves more than Polymarket. Its clients include Across (a cross-chain bridge), Sherlock (smart-contract insurance), and other DeFi projects. But Polymarket is its largest and most controversial client. Looking at the statistics, the overwhelming majority of disputes in UMA come from Polymarket markets, because this is the only use case in which outcomes are subjective and politically charged.<\/p>\r\n\r\n\r\n\r\n
Polymarket and UMA are legally two different companies, but they are connected. In 2024, Polymarket and UMA announced a partnership with EigenLayer to develop a \u201cnext-generation\u201d oracle based on restaking. Polymarket officially calls UMA its \u201ctrusted oracle\u201d, while UMA officially calls Polymarket its \u201clargest client\u201d. In other words, they are formally independent partners, but without Polymarket, UMA would lose much of its reason to exist. This creates another hidden asymmetry of interests, which I will return to below.<\/p>\r\n\r\n\r\n\r\n
How market resolution works through UMA Optimistic Oracle<\/h2>\r\n\r\n\r\n
\r\n<\/figure>\r\n<\/div>\r\n\r\n\r\nUMA\u2019s architecture is called Optimistic Oracle (OO), and it has two levels.<\/p>\r\n\r\n\r\n\r\n
Level 1: optimistic assertion. When a market closes, anyone can propose an outcome (for example, \u201cYes\u201d to the question \u201cWas there a ceasefire?\u201d). To do this, they must post a bond, usually $750 USDC on Polymarket. A two-hour challenge period then begins. If nobody disputes the proposal, the outcome is considered correct, and the proposer receives the bond back plus a small reward. According to UMA statistics, only around 1.5% of proposals are disputed. This is the fast path, and it covers the overwhelming majority of markets.<\/p>\r\n\r\n\r\n\r\n
Level 2: Data Verification Mechanism (DVM). If someone disputes the proposal (also posting $750 USDC), voting begins. This is where the interesting details start.<\/p>\r\n\r\n\r\n\r\n
Only UMA token holders who have staked their tokens can vote. Voting takes place in two stages:<\/p>\r\n\r\n\r\n\r\n
1. Commit phase (24 hours): voters publish a hash of their vote. The actual vote is hidden so that nobody can copy another participant\u2019s decision.<\/p>\r\n\r\n\r\n\r\n
2. Reveal phase (24 hours): voters reveal their votes together with the salt used to generate the hash.<\/p>\r\n\r\n\r\n\r\n
Voting power is proportional to the number of staked UMA tokens. A supermajority of more than 65% is required to make a decision. Those who vote with the majority receive rewards, while those in the minority are slashed (around 0.1% of their stake). The slashing is minor, but it creates a strong psychological effect: smaller voters are afraid of being wrong and vote \u201cwith the crowd\u201d rather than according to reality.<\/p>\r\n\r\n\r\n\r\n
Once voting ends, the result is returned to the Polymarket smart contract, the market closes, and payouts go to the winners. That is it. As Polymarket\u2019s documentation states directly: \u201cOnce finalized by UMA, outcomes are immutable\u201d. Polymarket cannot change the result, even if it wants to.<\/p>\r\n\r\n\r\n\r\n
Now for the key question: who are these voters?<\/p>\r\n\r\n\r\n\r\n
UMA\u2019s structural problem: the numbers do not add up<\/h2>\r\n\r\n\r\n\r\n
This is where the circus begins. Let us look at the numbers.<\/p>\r\n\r\n\r\n\r\n
\r\n\r\n\r\n
\r\n Parameter<\/strong><\/th>\r\n Value<\/strong><\/th>\r\n<\/tr>\r\n<\/thead>\r\n\r\n \r\n Polymarket monthly volume<\/td>\r\n $10.5 billion (March 2026)<\/td>\r\n<\/tr>\r\n \r\n UMA market capitalization<\/td>\r\n approximately $95 million<\/td>\r\n<\/tr>\r\n \r\n Total UMA staked<\/td>\r\n approximately 20 million tokens<\/td>\r\n<\/tr>\r\n \r\n Top 10 voters hold<\/td>\r\n approximately 30% of average voting activity<\/td>\r\n<\/tr>\r\n \r\n Largest whales (Hermansen estimate)<\/td>\r\n more than 50% of active voting power<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n Let that sink in. The platform\u2019s monthly volume is more than 100 times the market capitalization of the project that resolves all disputes on it. When the Zelenskyy suit controversy erupted in July 2025 (more on that below), a single market with $242 million in volume was decided by people holding tokens worth $95 million. Literally, it can be cheaper to buy a share of the voters than to lose the market.<\/p>\r\n\r\n\r\n\r\n
In March 2025, analyst Folke Hermansen examined voting concentration and found that several of the largest whales control more than 50% of active voting power in an average vote. Data from high-profile cases shows that the top 10 stakers account for around 30% of average voting activity \u2014 the fate of most markets is decided by a handful of addresses. For a system marketed as decentralized, this is effectively an oligopoly disguised with language about \u201ctruth-seeking\u201d.<\/p>\r\n\r\n\r\n\r\n
Separately, these whales often trade on Polymarket. They take a $1 million position, then vote in UMA in favor of their own outcome. The conflict of interest is built directly into the system\u2019s architecture. UMA argues that honesty is more profitable because discrediting the system would cause the token price to fall. That is a reasonable theory, but it breaks down in specific cases where a one-off profit on a $7 million market exceeds the expected losses from a falling token price.<\/p>\r\n\r\n\r\n\r\n
And one more thing: only UMA holders can vote. If you enter Polymarket, put down $50,000, and are clearly right on the facts, you still have no influence over the resolution. Completely different people vote \u2014 people who may not trade on the market at all or, more often, trade on the opposite side. This is the fundamental asymmetry behind the entire problem.<\/p>\r\n\r\n
[vc_message color=”warning” message_box_style=”classic” message_box_color=”alert-warning” style=”rounded”]<\/p>\r\n
Only holders of staked UMA tokens can vote in the UMA Data Verification Mechanism. A holder of a USDC position on Polymarket cannot influence the resolution, even if that position is worth one million dollars. This is a fundamental asymmetry of the system.<\/p>\r\n
[\/vc_message]<\/p>\r\n\r\n
Recent case: Russia x Ukraine ceasefire by May 31, 2026 (~$141 million, May 2026)<\/h2>\r\n\r\n\r\n
\r\n<\/figure>\r\n<\/div>\r\n\r\n\r\nThe most recent and most revealing case. Let us break it down in detail.<\/p>\r\n\r\n\r\n\r\n
Background.<\/strong> Polymarket had been running a series of markets titled \u201cRussia x Ukraine ceasefire by 2026\u201d for some time. The largest had deadlines of May 31, 2026, and June 30, 2026. The market rules were very clear, and this is not my summary but a direct quote:<\/p>\r\n\r\n\r\n\r\n
\u201cThis market will resolve to “Yes” if there is an official ceasefire agreement, defined as a publicly announced and mutually agreed halt in military engagement, between Russia and Ukraine. Only ceasefires which constitute a general pause in the conflict will qualify. Ceasefires which only apply to energy infrastructure, the Black Sea, or other similar agreements will not qualify. Any form of informal agreement will not be considered an official ceasefire. Humanitarian pauses will not count toward the resolution of this market.\u201d<\/p>\r\n\r\n\r\n\r\n
The key point: humanitarian pauses do not count, informal agreements do not count either, and the ceasefire must be a \u201cgeneral pause in the conflict\u201d \u2014 an actual halt to military activity across the entire front.<\/p>\r\n\r\n\r\n\r\n
What happened.<\/strong> On May 8, 2026, Trump announced a three-day ceasefire for May 9\u201311, timed to the May 9 parade in moscow. Both sides described it as a short-term pause, and a 1,000-for-1,000 prisoner exchange was also announced. There was no \u201cgeneral halt to military activity\u201d: it was a symbolic temporary pause.<\/p>\r\n\r\n\r\n\r\n
Does this qualify as a \u201chumanitarian pause\u201d, which the rules explicitly exclude? Yes. Is it an \u201cinformal agreement\u201d without an official treaty? Also yes. Is it a \u201cgeneral pause in the conflict\u201d? Clearly not: on May 12, one day after the \u201cceasefire\u201d ended, the russians launched more than 200 drones at Ukrainian cities. The war continued without any pause.<\/p>\r\n\r\n\r\n\r\n
![\"Volodymyr](\"https:\/\/lwallet.com.ua\/wp-content\/uploads\/2026\/05\/blog-why-polymarket-is-a-scam-29-05-2026-content-pic5-1-1024x573.jpg\" "\\"\\"")
<\/figure>\r\n<\/div>\r\n\r\n\r\n![\"Polymarket](\"https:\/\/lwallet.com.ua\/wp-content\/uploads\/2026\/05\/blog-why-polymarket-is-a-scam-29-05-2026-content-pic6-1024x573.jpg\" "\\"\\"")
<\/figure>\r\n<\/div>\r\n\r\n\r\n