Polymarket Once Again Caught in Oracle Manipulation Controversy, as 'Anchor Pregnancy' Market Sees Trading Volume Exceed $16.46 Million

On May 1, cryptocurrency prediction market platform Polymarket again faced controversy over its UMA oracle governance mechanism. Total trading volume for the "Will Clavicular be pregnant in 2026" market has reached $16.46 million, with 24-hour volume at ~$4.5 million—but the outcome remains disputed. The "Yes" share currently trades at $0.97, yet market rules explicitly state that "joking or untrustworthy pregnancy statements do not count toward the outcome." Some traders argue the event is already confirmed a "No," yet large sums continue flowing into "Yes" shares. Senior Polymarket trader Domahhhh posted that UMA has devolved from a "decentralized oracle" to a "misinformation engine controlled by a few whales." On-chain data shows the top 20 "Yes" addresses hold ~$2.54 million total—more than the $1 million held by the top 20 "No" addresses. The dispute follows long-running tensions between UMA and Polymarket. Previous markets (including those for "Trump’s phone call with Xi Jinping" and the "U.S.-Ukraine mining agreement") saw severe gaps between UMA’s voting results and actual events. In 2025, a $7 million market on the U.S.-Ukraine mining agreement was ruled "Yes" even though the agreement was never signed—leading the community to label it a "governance attack." UMA’s arbitration mechanism still relies on token holder voting, with critics saying a handful of whale addresses wield excessive influence. Meanwhile, Polymarket is advancing in-house infrastructure and future POLY token plans; the market widely believes it aims to gradually reduce UMA dependency.