UMA Updates Oracle to Restrict Polymarket Resolution Proposals

Polymarket’s oracle provider, UMA, has approved a major update to its prediction market platform, introducing new restrictions on who can submit market resolution proposals. The change, designed to improve accuracy and reduce disputes, will move Polymarket from its current Optimistic Oracle V2 (OOV2) to the Managed Optimistic Oracle V2 (MOOV2).

From Open Submissions to a Whitelisted Process

The transition follows the passage of UMA’s UMIP-189 governance proposal on August 6. Under MOOV2, only pre-approved whitelisted users will be able to submit resolution proposals for prediction markets. UMA says this approach aims to ensure that experienced participants—rather than newcomers—handle the critical step of determining market outcomes.

A UMA community manager confirmed in the project’s Discord channel that the ManagedOptimisticOracleV2 contract, managed by Polymarket, is now supported on the Oracle Dapp. Testing has already begun on the Polygon mainnet with real proposal rewards, and full migration of production requests is expected in the near future.

Addressing Manipulation and Disputes

According to UMA, the change is intended to combat risks of market manipulation and governance attacks, including incidents where large UMA token holders or whales may have influenced resolutions. The whitelist is initially limited to 37 addresses, including employees of Risk Labs—the entity behind UMA—Polymarket staff, and users with a track record of more than 20 proposals with at least 95% accuracy.

PolymarketGuide, an independent resource for the platform, notes that one of the main flaws of OOV2 was the high volume of premature and inexperienced proposals. These often resulted in the loss of proposer bonds and caused delays of up to four days. With MOOV2, other users can still tag whitelisted proposers to submit on their behalf, but anyone may continue to dispute a proposal.

Moving Toward a Curated Proposer Model

PolymarketGuide describes the update as a shift from an open, debate-driven model to one governed by a smaller, vetted group of proposers. The goal is to ensure due diligence is performed before submission, especially in non-contentious markets such as sports, weather, and cryptocurrency price predictions.

By narrowing the pool of eligible proposers, UMA and Polymarket hope to enhance market efficiency and reliability, reducing the number of early disputes while maintaining the ability for the wider community to challenge outcomes when necessary.