StartupHub.ai's proprietary cross-venue engine has surfaced seven live prediction market arbitrage opportunities as of August 21, 2026. These opportunities involve the same real-world event being priced on two different prediction market venues, allowing for a guaranteed payout by simultaneously buying 'YES' on one market and 'NO' on the other for a combined cost under $1.
This strategy, known as an arbitrage lock, capitalizes on temporary price discrepancies. While these spreads can close quickly, and factors like fees, KYC requirements, and withdrawal limits can impact actual returns, these current opportunities present a fascinating look at market inefficiencies.
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.