StartupHub.ai's cross-venue engine has surfaced five live prediction market arbitrage opportunities as of August 3, 2026. These opportunities involve the same real-world event being priced on two distinct venues, such as Polymarket, Kalshi/Robinhood, or PredictIt, where buying a 'YES' on one platform and a 'NO' on another totals less than $1, thereby locking in a guaranteed payout.
An arbitrage lock occurs when you can simultaneously bet on both outcomes of an event across different platforms for a combined cost of less than $1, guaranteeing a profit regardless of the event's resolution. While five opportunities are currently live, spreads can move fast, and any others that opened in the last few hours may have already closed. It is important to remember that this 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.