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# Price Sources and Result Evidence

> Understand the platform mark price used by prediction games and the evidence required for direction or time-window results.

All three prediction games use the platform's perpetual-contract mark price for their price basis. A last trade, an external exchange quote, or a browser chart can differ from that mark price.

## Evidence by game

| Game    | Relevant evidence                                                           |
| ------- | --------------------------------------------------------------------------- |
| Up/Down | Round opening price, settlement price, and scheduled timestamps             |
| Custom  | The order's opening price, expiry, and settlement price                     |
| Grid    | The accepted interval, valid time window, and price path during that window |

## Why a screenshot may differ

A display can be delayed, rounded, sampled at a different interval, or show another price type. Compare the symbol, price source, timestamp, and precision before concluding that a result is wrong.

For grid orders, the final price alone cannot prove whether an earlier touch occurred. The valid-window price evidence matters, including a crossing between observed prices under the game's rule.

## Time and boundaries

Use the timestamps stored with the order. A device clock or countdown is an aid for display, not the authority for accepting a late order or changing its window. Boundary inclusion and price precision must match the applicable product rules.

## When data is abnormal

Keep the order number and the affected time window, then check the order's processing status. Do not substitute another exchange's price to settle a disputed order yourself. See [Refunds and Exceptions](/prediction/refunds-exceptions).