StartupHub.ai's proprietary cross-venue engine has surfaced 8 prediction market arbitrage opportunities as of August 16, 2026. These opportunities involve the same real-world event being priced on two different prediction market venues, such as Polymarket, Kalshi/Robinhood, or PredictIt, where buying a 'YES' contract on one venue and a 'NO' contract on the other costs less than $1 combined.
This price discrepancy allows for a guaranteed payout, as one of the contracts is certain to resolve to $1. While our engine detected these 8 opportunities live, spreads can move rapidly, and other opportunities may have opened and closed within the last few hours. It is important to remember that this information is not financial advice, and factors like fees, KYC requirements, and withdrawal limits can 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.
Focused guides: Polymarket arbitrage, Kalshi arbitrage, and the arbitrage bot API.