Our proprietary cross-venue engine at StartupHub.ai has surfaced five live prediction market arbitrage opportunities as of July 26, 2026. These opportunities involve the same real-world event being priced on different prediction markets, specifically Polymarket, Kalshi/Robinhood, and PredictIt.
An arbitrage lock occurs when buying a 'YES' contract on one venue and a 'NO' contract for the same event on another venue costs less than $1 combined, guaranteeing a profit regardless of the outcome. It is crucial to remember that spreads can close quickly, and fees, KYC requirements, and withdrawal limits may impact actual returns. This information is for educational purposes only and is not financial advice.
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=1Read 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.