Prediction Market Arbitrage: 5 Live Opportunities o…

StartupHub.ai's proprietary cross-venue engine has surfaced 6 prediction market arbitrage opportunities as of August 20, 2026. These opportunities involve the same real-world event being priced on two different venues, 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 'YES' on one market and 'NO' on another for the same event, with the total cost being less than $1, guaranteeing a profit regardless of the outcome. Five of these spreads are live right now, while one was seen earlier today and may have already closed. Spreads can move extremely fast, and fees, KYC requirements, and withdrawal limits can impact actual returns.

Live arbitrage right now These update automatically. Tap a leg to open the venue. Not financial advice.

Which party will win the 2026 US Senate election in South Carolina?, Republican. Arbitrage: 244.8% ROI, locks 71c per $1. Buy YES on Polymarket at 11c, buy NO on PredictIt at 18c.
Where will Putin and Zelenskyy next meet? Will Putin and Zelenskyy meet next in Switzerland?. Arbitrage: 10.9% ROI, locks 10c per $1. Buy YES on Polymarket at 0c, buy NO on Kalshi / Robinhood at 90c.
French presidential election: who will advance? Will François Hollande qualify for the runoff in the 2027 French presidential election?. Arbitrage: 7.4% ROI, locks 7c per $1. Buy YES on Polymarket at 0c, buy NO on Kalshi / Robinhood at 93c.
Who will leave Trump's Cabinet next? Will Chris Wright be the next person to leave the Trump Cabinet?. Arbitrage: 5.3% ROI, locks 5c per $1. Buy YES on PredictIt at 9c, buy NO on Kalshi / Robinhood at 86c.
Who will win the next French presidential election?, Gérald Darmanin. Arbitrage: 5.1% ROI, locks 5c per $1. Buy YES on Polymarket at 0c, buy NO on PredictIt at 95c.
Will Trump recognize Somaliland? :: During Trump's term. Combined cost 99c (no lock right now). Buy YES on Polymarket at 8c, buy NO on Kalshi / Robinhood at 91c.

See the full live arbitrage board or poll the free JSON API.

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.

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Prediction Market Arbitrage: 5 Live Opportunities on August 20, 2026

Track these live, or poll the free API