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# DISPUTE_WINDOW_CLOSED

> HTTP 409 — Dispute window closed

**HTTP status:** 409 · **Title:** "Dispute window closed"

## When it fires

`POST /v1/markets/{id}/disputes` was called after the dispute window of the market's proposed resolution ended. Every proposal opens one dispute window, ending at `resolution.finalizableAt` on `GET /v1/markets/{id}`. An undisputed proposal is settled when the window ends, so no dispute is accepted afterwards: a later filing could only race the settlement. The check is atomic, so a request that crosses the window's end is refused rather than recorded.

## Why it happens

* The filing was sent after `finalizableAt`.
* The filing was sent just before `finalizableAt` and was processed after it.

## How to fix

* There is nothing to retry: the proposal is being settled, and a retry is refused the same way.
* File disputes while `resolution.resolutionState` is `proposed` and `finalizableAt` is still in the future.
* Follow the settlement through `GET /v1/markets/{id}`.

## Related codes

* [`DISPUTE_DECIDED`](/developer-docs/api-errors/DISPUTE_DECIDED), [`DISPUTE_ALREADY_FILED`](/developer-docs/api-errors/DISPUTE_ALREADY_FILED), [`MARKET_NOT_DISPUTABLE`](/developer-docs/api-errors/MARKET_NOT_DISPUTABLE)


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