StartupHub.ai's proprietary cross-venue engine has surfaced 13 prediction market arbitrage opportunities as of July 18, 2026. An arbitrage lock occurs when buying a 'YES' contract on one venue and a 'NO' contract on another for the same real-world event costs less than $1 combined, guaranteeing a payout of the difference.
Twelve of these opportunities are live right now, offering immediate potential for guaranteed returns. The remaining one was seen earlier today and may have already closed, as spreads on these markets can move very quickly. It is crucial to remember that this is not financial advice, and potential returns can be impacted by fees, KYC requirements, and withdrawal limits on each platform.
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.
Informational feed, not financial advice. Live arbitrages are often fleeting, and fees, gas, KYC and withdrawal limits eat into the spread. Verify each market’s resolution rules and costs before trading.