StartupHub.ai's proprietary cross-venue engine has identified 10 prediction market arbitrage opportunities as of July 31, 2026. These opportunities arise when the combined price of buying 'YES' on one platform and 'NO' on another for the same real-world event totals less than $1, guaranteeing a profit regardless of the outcome.
Nine of these spreads are live right now, offering immediate chances for arbitrage. The remaining opportunity was seen earlier today and may have already closed, highlighting the fast-moving nature of these markets.
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.
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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.
