Arbitrage Alert: 8 Prediction Market Opportunities Live Now, Up to 58% ROI

StartupHub.ai's proprietary cross-venue engine has detected 8 live prediction market arbitrage opportunities as of August 19, 2026. These opportunities involve the same real-world event being priced on two different platforms, such as Polymarket, Kalshi/Robinhood, or PredictIt, where buying a 'YES' on one venue and a 'NO' on the other costs less than $1 combined.

An arbitrage lock occurs when you can simultaneously buy a 'YES' contract and a 'NO' contract for the same event across different markets for a total cost under $1, guaranteeing a profit regardless of the outcome. While these spreads offer guaranteed payouts, it is crucial to remember that prices can move rapidly, and fees, KYC requirements, and withdrawal limits can impact net returns. This information is for informational purposes only and is 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=1

Read the arbitrage API reference or open the live JSON endpoint.

Focused guides: Polymarket arbitrage, Kalshi arbitrage, and the arbitrage bot API.

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.