Our proprietary StartupHub.ai engine, designed to scour the prediction market landscape, has once again delivered. As of August 11, 2026, it surfaced 10 distinct arbitrage opportunities across Polymarket, Kalshi/Robinhood, and PredictIt. These opportunities arise when the combined price of a 'YES' share on one platform and a 'NO' share for the same real-world event on another platform totals less than $1, guaranteeing a profit.
Nine of these spreads are currently live, offering immediate potential for a locked-in payout. One additional opportunity was observed within the last few hours but may have already closed, highlighting the fast-moving nature of these markets. It is crucial to remember that spreads can close rapidly, and factors like fees, KYC requirements, and withdrawal limits can impact actual returns. This information is for informational purposes only and does not constitute 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.
Focused guides: Polymarket arbitrage, Kalshi arbitrage, and the arbitrage bot API.