Polymarket US Tests Parlays as Kalshi Banks $25M in Fees

Polymarket US began processing multi-leg sports contracts on Aug. 5 through an API-only beta that never surfaced in its consumer app. The launch lands as rival Kalshi is reported to be extending maker fees to its own parlay product, a change its published fee schedule does not list. An API-Only Launch 11 Weeks After Certification […]