Arb Research

manifold.markets (play money)
metaculus.com (play money, occasional cash prizes)
predictit.org (real money)
replicationmarkets.com (real money)
polymarket.com (ethereum)
augur.net (ethereum)
hypermind.com (real money)
GJOpen.com (leaderboard plus gigs for winners)
kalshi.com (real money)
Foresight Exchange (play money)
INFER (play money)
Futuur (crypto or play money)
Cultivate Flashcast (bragging rights)
predictionbook.com (just score)