Palmeiras vs. Cerro Porteño Arbitrage Gap Tops 1,076% Return

A massive 1076.47% arbitrage opportunity has opened up between Polymarket and Kalshi on the SE Palmeiras vs. Club Cerro Porteño market. Polymarket has Cerro Porteño (YES) priced at 7.5¢, while Kalshi is quoting Cerro Porteño (NO) at 1.0¢. A combined position costs just 8.5¢ for a guaranteed 100¢ payout on settlement, representing a potential $5,382 return on a $500 capital outlay. Execution risk is high: Polymarket's listed expiration was 2026-05-21, while Kalshi expires 2026-06-04. Verify actual match status and settlement rules before deploying capital, as there is no reported volume on these books. In US politics, GA-04 and GA-06 House markets present 723% and 640% net returns. For GA-04, buying NO on Polymarket at 6.2¢ and YES on Kalshi at 6.0¢ creates a 12.2¢ entry. However, note the settlement mismatch: Polymarket's market expires in November 2026, whereas Kalshi's contract does not expire until November 2027, which will lock up your capital for a full year. French Presidential run announcements also show major gaps for Jean-Luc Mélenchon (709.72% net profit) and Gabriel Attal (672.20% net profit). Both suffer from zero reported volume, meaning any size order will face significant slippage. Limit orders are mandatory here.