StartupHub.ai's proprietary cross-venue engine has identified 10 prediction market arbitrage opportunities as of August 18, 2026. These opportunities arise when the 'YES' price on one venue and the 'NO' price on another for the same real-world event sum to less than $1, guaranteeing a profit regardless of the outcome.
Eight of these spreads are currently live, offering immediate potential for traders. The remaining two were observed within the last hour and may have already closed, underscoring 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 educational 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.