UMA
UMA stands for Universal Market Access. In the Polymarket context, it's the decentralized answer-providing system.
Prediction Markets 101 editorial team Updated April 16, 2026 1 min read
Definition
UMA is an optimistic oracle protocol. Polymarket uses UMA's oracle for market resolution.
Plain-English explanation
UMA's optimistic oracle lets anyone propose an answer to a question with a bond. If undisputed in the dispute window, the answer stands. If disputed, UMA token holders vote on the answer. Honest voters earn rewards; dishonest voters lose slash bonds.