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Data is provided as flat files — CSV (gzip-compressed) for all exchanges, plus Parquet (zstd-compressed) for Kalshi. New here? Start with the Quickstart to list and download.

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Polymarket

List exports by event slug, market slug, or asset ID (no API key needed to list). Download with apikey in the query. See Finding Available Files.

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Kalshi

List exports by ticker; download using the path from the response. Auth is the x-auth-token header. See Finding Available Files.