> For the complete documentation index, see [llms.txt](https://docs.uniocean.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.uniocean.io/forecast-platform/markets/market-cancellation.md).

# Market Cancellation

A market may be cancelled when it cannot be settled fairly or reliably.

## Cancellation Reasons

* Fewer than 15 predictions
* Settlement timeout
* Oracle unavailability
* Invalid timing edge cases

## Minimum Participation

A market needs at least **15 predictions** to settle.

If only 8 users enter a market, the market is cancelled and all 8 receive full refunds.

## Settlement Timeout

If settlement cannot complete within **10 minutes** after close, the market may be cancelled.

## Refund Rules

When cancelled:

* 100% of entry fees are returned.
* Refunds are automatic.
* Users do not pay gas fees.
* The system retries failed refunds.

```mermaid
flowchart LR
    A[Market Cancelled] --> B[Identify Entries]
    B --> C[Calculate Refunds]
    C --> D[Return Funds]
```

***

## Related Pages

* [Market Lifecycle](/forecast-platform/markets/market-lifecycle.md)
* [Auto Refunds](/forecast-platform/settlement/auto-refunds.md)
* [FAQ](/forecast-platform/faq/faq.md)