StartupHub.ai's cross-venue engine has surfaced six live prediction market arbitrage opportunities as of August 28, 2026. These opportunities involve the same real-world event being priced on different prediction markets, allowing for a guaranteed payout by simultaneously buying 'YES' on one venue and 'NO' on another for a combined cost under $1.
An arbitrage lock occurs when the combined price of a 'YES' contract on one market and a 'NO' contract on another market for the same event totals less than $1. This allows a trader to buy both sides, guaranteeing a profit regardless of the outcome. It is important to note that spreads can close quickly, and fees, KYC requirements, and withdrawal limits can impact actual 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=1Read the arbitrage API reference or open the live JSON endpoint.
Focused guides: Polymarket arbitrage, Kalshi arbitrage, and the arbitrage bot API.