Polymarket's endDate Field Does Not Mark Resolution Deadline, Analysis Finds

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Developer research firm OrcaLayer examined 23 Polymarket markets via the Gamma API on 23–24 September 2026 and found that the endDate field does not represent the resolution deadline as Polymarket's documentation implies. Across sports markets, endDate corresponded to kickoff time for NFL and soccer, scheduled start plus six hours for esports, and original start plus seven days for tennis — none of which matched the actual resolution rules. The true binding deadline for each market is written in plain English within the description field, while trading status is reflected in the closed and acceptingOrders fields. Developers building tools on Polymarket data — including trading bots, dashboards, or predictive models — risk errors if they rely on endDate as a resolution timestamp. OrcaLayer cautioned that endDate's meaning varies by market type and the API itself does not formally document what the field represents.

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