Kalshi vs Polymarket in 2026: Full Comparison + Arbitrage Playbook
The One-Line Difference
Kalshi is a CFTC-regulated Designated Contract Market — every contract is an SEC/CFTC-sanctioned event. Polymarket runs on crypto and, for many US persons, carries more jurisdictional nuance. For a US-based, compliance-first trader, Kalshi is the hero. Polymarket becomes interesting only as an arb counterparty.
Head-to-Head
| Dimension | Kalshi | Polymarket |
|---|---|---|
| Regulator | CFTC | Crypto /离岸 |
| Deposit | USD (ACH/Card) | USDC |
| Order book | Yes (full depth) | Yes (CLOB) |
| US access | 50-state nuance | Restricted for many US persons |
The Arbitrage Playbook
When Kalshi YES + Polymarket NO < 1.00, you can buy both "yes" outcomes across the two venues and lock a settlement profit. Example:
- Kalshi YES @ 0.48, Polymarket NO @ 0.49 → combined cost 0.97.
- Exactly one side settles at 1.00 → +0.03 edge, ~3% risk-free.
OddsPit flags these automatically as the Cross-Platform Arb signal (Pro), and only when Polymarket is enabled.
Risks
Settlement rules differ between venues, and withdrawal/float risk exists on the crypto side. Size arb positions small and confirm the economic event maps 1:1.
FAQ
Is Polymarket illegal in the US? It is restricted for many US persons; treat it as optional and jurisdiction-dependent.
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