Prediction Market Arbitrage: 5 Opportunities Live Now on Polymarket, Kalshi, PredictIt (July 15, 2026)

StartupHub.ai's proprietary cross-venue engine has identified five live prediction market arbitrage opportunities as of July 15, 2026. These spreads involve the same real-world events priced on different platforms like Polymarket, Kalshi/Robinhood, and PredictIt, where buying a 'YES' on one venue and a 'NO' on another totals less than $1, thereby locking in a guaranteed profit.

For newcomers, an arbitrage lock occurs when you can simultaneously bet on both outcomes of an event across different platforms for a combined cost of less than $1, guaranteeing a payout regardless of the result. It's crucial to remember that these spreads can close very quickly, and factors like trading fees, KYC requirements, and withdrawal limits can impact the final ROI.

Track these live, or poll the free API

The board above refreshes on its own, so this page stays current long after today. The full cross-venue feed lives on the arbitrage board, and every match is also a free JSON API and an MCP tool, so a trading agent can poll live Polymarket, Kalshi and PredictIt arbitrage opportunities and act on them.

curl https://www.startuphub.ai/api/v1/arbitrage?arbs_only=1

Read the arbitrage API reference or open the live JSON endpoint.

Informational feed, not financial advice. Live arbitrages are often fleeting, and fees, gas, KYC and withdrawal limits eat into the spread. Verify each market’s resolution rules and costs before trading.