> 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/oracles/uma.md).

# UMA Oracle

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

Here's how it works:

When a market is ready to resolve, users can propose an outcome through the UMA Oracle by posting a **bond, typically $750**. If the proposal goes **unchallenged**, the market resolves to that outcome and the proposer receives their bond back plus a reward.

If the proposal is **disputed**, it goes to a **vote**, where UMA voters determine how the market should resolve. If the proposer **loses**, they lose their bond.

<figure><img src="https://3511841878-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FwmHFi7NV8gmAN3L4jVKb%2Fuploads%2FOYREELRllLlVuBeuerZE%2Fimage.png?alt=media&amp;token=30194b5b-88dc-455b-9e62-ffa8c3316a53" alt=""><figcaption></figcaption></figure>

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

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