Legality in California
Both are CFTC-regulated event-contract platforms, legal in all 50 US states including California. No regulatory differentiation.
Markets and coverage
Sleeper covers NFL, NBA, MLB, NHL, soccer including World Cup 2026, and select cultural markets. Rebet covers NBA, NFL, soccer, tennis Grand Slams, MLB, and cultural markets. The coverage is similar, with Sleeper deeper on NFL and Rebet broader across cross-sport markets.
Pricing & fees
Both charge per-contract fees disclosed at order entry, in similar ranges. Neither has a house margin.
User experience
Sleeper's social layer is built around existing fantasy leagues — the trading happens in the same app as your draft and group chat. Rebet's social layer is built around newer community features — feeds, shared tickets, live chat on every market. Same social impulse, different anchoring ecosystem.
Who should use which
Use Sleeper if: you already use Sleeper for fantasy, your league group chat is already there, your sports life is anchored to fantasy. Use Rebet if: you don't have a fantasy home base, you want cross-sport trading (NBA + World Cup + Wimbledon) in one social app, your community isn't already on another platform.