Today, July 20, 2026, StartupHub.ai's proprietary cross-venue engine has surfaced 11 live prediction market arbitrage opportunities. These opportunities arise when the same real-world event is priced differently across multiple platforms like Polymarket, Kalshi/Robinhood, and PredictIt, allowing for a risk-free profit.
An arbitrage lock occurs when buying 'YES' on one venue and 'NO' on another for the same event costs less than $1 in total, guaranteeing a payout of $1 regardless of the outcome. While 11 opportunities are live right now, it is important to remember that spreads can close very quickly, and fees, KYC requirements, and withdrawal limits on individual platforms will impact actual returns.
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.