Palmeiras vs. Cerro Porteño Leads Arbitrage Gaps with 1076% Spread

Arbitrage opportunities today are dominated by significant structural mismatches, though execution remains heavily constrained by low liquidity and divergent settlement dates. The widest gap sits in SE Palmeiras vs. Club Cerro Porteño. Polymarket's Cerro Porteño YES at 7.5¢ paired with Kalshi's Cerro Porteno NO at 1.0¢ yields a theoretical 1076.47% net profit ($5,382 return on $500). However, execution here is practically impossible: the contracts carry mismatched, past-due expiries (Poly May 21 vs. Kalshi June 4) with zero active volume. In politics, the GA-04 House Election features a 915.23% net profit gap. Polymarket prices Republican YES at 1.8¢, while Kalshi offers Republican NO at 8.0¢. The catch is the settlement mismatch: Polymarket settles on November 3, 2026, while Kalshi's contract is listed through November 3, 2027. This introduces a 12-month capital lockup risk that diminishes the true annualized return. For cleaner execution, watch the China Q2 2026 GDP growth markets. Polymarket's <4.0% YES at 0.3¢ and Kalshi's Above 4.0% NO at 13.0¢ present a 654.72% net profit opportunity. Expiries are tightly aligned (July 16 vs. July 22, 2026). Watch order book depth, as liquidity on these outer tails remains thin.