> For the complete documentation index, see [llms.txt](https://polymarketguide.gitbook.io/polymarketguide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://polymarketguide.gitbook.io/polymarketguide/resolution/uma-oracle.md).

# UMA Oracle

**UMA (Universal Market Access)** is the oracle protocol Polymarket uses to resolve markets on its international platform. 

Here's how it works: 

When a market is ready to be resolved, users can propose an outcome through the UMA oracle by posting a **$750 bond**. If the outcome goes **unchallenged**, the market resolves to that outcome and the proposer earns their bond back plus a **$2 reward**. If it's **disputed**, it goes to a vote, where oracle participants decide how the market should resolve. If the proposer **loses**, they **lose their bond**.

*Example*: How UMA's Optimistic Oracle resolves a market

<figure><img src="/files/yA0WLeoAHLYyhc7k1fa7" alt=""><figcaption></figcaption></figure>

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*Watch*: UMA's Optimistic Oracle Explained (3 min)

{% embed url="<https://www.youtube.com/watch?v=7gSyCWhGE3Q>" %}