StartupHub.ai's proprietary cross-venue engine has surfaced 15 prediction market arbitrage opportunities as of August 8, 2026. These opportunities involve the same real-world event being priced on two different venues, such as Polymarket, Kalshi/Robinhood, or PredictIt, where buying a 'YES' contract on one venue and a 'NO' contract on the other totals less than $1. This allows for a guaranteed payout, as one of the contracts is certain to resolve to $1.
Twelve of these arbitrage opportunities are live right now, offering immediate potential for profit. The remaining three were observed earlier today and may have already closed, as spreads on prediction markets can move very quickly. It is crucial to remember that this information is for informational purposes only and not financial advice. Spreads can close fast, and transaction 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.