As of August 30, 2026, StartupHub.ai's cross-venue engine has surfaced seven live prediction market arbitrage opportunities. These opportunities involve the same real-world event being priced differently across venues like Polymarket, Kalshi (including its Robinhood integration), and PredictIt, allowing for a risk-free profit.
An arbitrage lock occurs when buying 'YES' on one market and 'NO' on an equivalent market on a different venue costs less than $1 in total, guaranteeing a payout of $1 regardless of the outcome. It is crucial to remember that spreads can close quickly, and potential profits may be affected by fees, KYC requirements, and withdrawal limits. This information is for educational purposes only and not 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.