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The windowing issue

Candle data must match the selected resolution and the call timestamp. If the anchor timestamp is wrong, the chart can drift and show the wrong window.

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Request strategy

OpenKol requests candles using a UTC aligned timestamp and a predictable range:
  • Round the anchor timestamp to UTC midnight.
  • For weekly ranges, move in 7 day steps.
  • Use the market data provider candle endpoint with an explicit timezone.

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Trimming to the analysis window

After fetching candles:
  • Compare candle timestamps to the call time.
  • Keep only the candles that fall within the selected analysis window.
  • Ensure the window matches the resolution (5m, 15m, 1h, 4h, 12h).

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Outcome

This keeps chart windows aligned to the call and prevents off by one errors across daily and weekly ranges.