Polymarket is facing renewed scrutiny over how it resolves disputed markets. A Wall Street Journal analysis of blockchain data found that the anonymous token holders ruling on contested bets are often the same people who placed them.
The platform outsources dispute resolution to UMA, a decentralised oracle protocol governed by token holders. The WSJ found that at least 60% of active UMA voters are directly linked to Polymarket accounts. In roughly one in five disputes, at least one voter held a direct financial stake in the outcome they were arbitrating.
Voting power is also concentrated: more than 50% of it sits with the 10 largest wallets in most disputes, which puts the "decentralized" label under some strain.
Why the Model Exists
Polymarket moved to UMA in 2022. By outsourcing dispute resolution to external token holders, Polymarket strengthened its argument that the platform operates as a decentralized offshore system outside CFTC jurisdiction.
Rival Kalshi handles disputes internally, as a CFTC-registered exchange. That legal architecture is now generating its own risks. "That should be Polymarket's responsibility, not some outsourced, third-party, mysterious, anonymous token holders," said Nic Carter, founding partner of Castle Island Ventures.
The Volume Problem
Disputes are scaling with the platform. More than 1,150 Polymarket markets have triggered arbitration so far in 2026, already exceeding the full-year total for 2025.
The contested outcomes range from technical readings of the Iran-Israel conflict to the verifiable status of a celebrity pregnancy. Each one requires human judgment on ambiguous real-world events, often by anonymous token holders who may also hold positions in the same markets.
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The issue drew more attention recently when UMA.rocks removed a prominent member over market manipulation allegations. The individual, known as "Scout," admitted to regularly voting on resolutions while holding positions in the same contracts, and defended the practice.
"You can either have traders with a conflict of interest, or morons with no conflict of interest," he told the WSJ. "There's not really a good middle ground."
Some longtime Polymarket users and crypto market participants have also criticized UMA’s governance structure, arguing that it gives large token holders incentives to influence outcomes in markets where they hold positions.
Hopefully Polymarket is on precipice of replacing UMA, because the "oracle" that underpins the site is now a disinformation engine that has been taken over by rogue traders.
— Domer❤️🔥 (@Domahhhh) April 30, 2026
(If you find the below post confusing, byzantine, stupid, or anything else, first of all that's probably… pic.twitter.com/Z9mtuKsW2O
What It Means for Institutional Adoption
The dispute resolution directly affects settlement outcomes. It determines whether a contract pays out at 0 or 1. As prediction markets approach the scale where institutional capital becomes a meaningful factor, the question of who rules on outcomes and under what rules is a threshold issue for integration.
Polymarket founder Shayne Coplan has described the current process as "messy" and indicated improvements are coming. But the conflict between an anonymous arbitration model and the transparency standards that institutional counterparties expect is not easily resolved by iteration.
Until it is, the dispute engine remains a structural obstacle to the platform's mainstream financial ambitions.
