World Cup rockets prediction‑market volumes past $45 B in June
June saw Kalshi’s notional volume jump to over $31 billion—a 70% rise from May—while Polymarket topped $10.8 billion, both driven by World Cup betting. New entrant Rothera, backed by Susquehanna and Robinhood, handled $2 billion in its debut month, now accounting for 7% of U.S. prediction‑market traffic. The surge tests whether these platforms can sustain high‑volume, regulator‑scrutinized markets.