StartupHub.ai's proprietary cross-venue engine has identified 10 prediction market arbitrage opportunities as of July 21, 2026. An arbitrage lock occurs when the combined price of buying a 'YES' contract on one platform and a 'NO' contract for the same real-world event on another platform totals less than $1, guaranteeing a profit regardless of the outcome.
These opportunities span major prediction market venues including Polymarket, Kalshi/Robinhood, and PredictIt. While 9 of these spreads are currently live, it's crucial to remember that prediction market prices are highly dynamic and can close rapidly. Potential investors should also factor in platform fees, KYC requirements, and withdrawal limits, which can impact overall 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.
