Polymarket vs Kalshi — what Insydr compares
Side-by-side notes on venue type, contract style, how Insydr maps pages, and when probabilities must not be averaged across platforms.
Comparison table
| Dimension | Polymarket | Kalshi |
|---|---|---|
| Venue type | Crypto prediction market (USDC) | CFTC-regulated event contracts (USD) |
| Typical Insydr page | Provider event / multi-outcome children | Dated event pages; series ticker for hubs only |
| Probability display | Exchange-implied from snapshots | Exchange-implied from snapshots |
| Cross-venue average | Only after compatible verification | Only after compatible verification |
| Recurring contracts | Event-centric grouping | Series identifier for membership; per-date pages |
Scope
This page compares Polymarket and Kalshi as venues represented in Insydr's public catalog. It is editorial research, not an endorsement, ranking, or trading recommendation.
How Insydr uses each venue
Polymarket events usually map to provider event pages with child markets. Kalshi often uses series tickers for recurring contracts; Insydr still publishes **event** pages for dated windows and optional series hubs — never a single series-level probability.
When not to average
If resolution rules, strike definitions, or payout units differ, keep provider rows separate. Topic hubs store semantic compatibility before any side-by-side probability display.
Corrections
Material factual corrections bump `updatedAt` and `lastReviewedAt` on this page.