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0xinsider covers two prediction-market platforms: Polymarket and Kalshi. They are not at parity. Polymarket is fully covered. Kalshi coverage is partial, because some of the on-chain signals 0xinsider computes do not exist for Kalshi’s centralized markets. Plan around the real coverage. A copy-trading or whale-tracking integration that assumes Kalshi grades or Kalshi whale data will come back empty.

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The platform enum

Anywhere a platform field or filter appears, the values are lowercase:
  • polymarket
  • kalshi
Endpoints that accept a platform filter (whale-trades history, smart-money flows, explore) also accept all.

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Capability matrix

This mirrors the live GET /api/v1/platforms response, which is the source of truth. Query it at runtime rather than hard-coding coverage. supported means the feature is fully populated. partial means some fields are present but not all (Kalshi market snapshots carry last price but no order-book top-of-book, for example). unsupported means the feature does not apply to that platform and returns no data.

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Polymarket-only features

Two surfaces are Polymarket-only today, independent of any platform filter you pass:
  • Whale trades (/whale-trades, /whale-trades/history). The whale-trade feed is built from Polymarket fills only. A platform=kalshi filter returns nothing.
  • Large positions (/large-positions). The large-position scanner runs against Polymarket markets only.
Trader grades, strategy classification, and insider radar are also Polymarket-only, as the matrix shows.

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What works on both

These read paths return both Polymarket and Kalshi data: When a field is thin or absent for Kalshi, trust metadata marks it. An unsupported source surfaces as unavailable. You can detect coverage gaps in code instead of guessing.