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Documentation Index

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Open trader positions are fully accurate and updated as trades settle on-chain (Polymarket) or via the Kalshi websocket. Both sources are backfilled on reconnect.
This endpoint requires a Growth or Enterprise plan. Learn more.

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Returns

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Arguments

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Usage Guidelines

  • Use this endpoint to display a trader’s open positions and market details.
  • Pair with predictionMarketPrice to compute live unrealized PnL on open positions.
  • Works across both Polymarket and Kalshi markets supported by Codex.
  • For historical performance beyond open positions, combine with predictionTraderMarketsStats (data available from ~Feb 2026, when Codex began indexing).

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Troubleshooting Tips

Open trader positions are expected to be fully accurate. Polymarket data is derived from Polygon transaction processing. Kalshi data is sourced via Kalshi’s websocket.
No. This endpoint returns current holdings only. For historical trade activity, use the predictionTraderMarketsStats endpoint.
Either the trader has no open positions, or the trader address is from a market we don’t index. Confirm the address is active on a supported venue (Polymarket or Kalshi).
Yes. Combine holdings quantities with the latest predictionMarketPrice result for each market.
  • Prediction Traders: Learn how to build trader leaderboards, profiles, and portfolio analytics for prediction market traders