Malta Parliamentary Election Arbitrage Yields 1552% Gap Amid Major Expiry and Liquidity Risks

A series of massive pricing mismatches has opened up between Kalshi and Polymarket, led by a 1552.89% gross gap on the Malta Parliamentary Election 3rd Place market. However, traders must look past the theoretical returns: every high-yield gap currently on the board carries significant execution risk, primarily driven by severe illiquidity (zero reported volume) and contract mismatching. For the Malta trade, buying Labour Party (YES) on Polymarket at 0.1¢ and Labour Party (NO) on Kalshi at 6.0¢ offers a massive theoretical payoff, but Polymarket's contract expires on May 30, 2026, while Kalshi's doesn't expire until May 30, 2027. This 12-month settlement gap exposes traders to prolonged capital lockups. Similar structural risks plague the other top opportunities. The Alabama Republican Senate Primary markets for Barry Moore and Jared Hudson list Polymarket expiries of May 19, 2026 (already passed), compared to Kalshi's May 2027 expiries, suggesting stale books or settlement lags. The Copa Libertadores match between Palmeiras and Cerro Porteño is similarly unfeasible, with Polymarket's side expiring on May 21. The only trade with active settlement potential is the Brazil GDP Q1 growth mismatch, though it still carries a one-month settlement lag between platforms (Poly on May 29 vs. Kalshi on June 30). Trade with caution: without organic book depth, slippage will wipe out these theoretical spreads instantly.