Prediction Market Arbitrage: 10 Opportunities Live…

StartupHub.ai's proprietary cross-venue engine has surfaced 10 live prediction market arbitrage opportunities as of July 19, 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' contract on one venue and a 'NO' contract on another totals less than $1. This strategy effectively locks in a guaranteed payout, regardless of the event's outcome.

For newcomers, an arbitrage lock means you can buy both sides of a bet for a combined cost less than the potential payout, guaranteeing a profit. It's important to note that spreads can close very quickly, and factors like fees, KYC requirements, and withdrawal limits on individual platforms can impact actual returns. This information is for informational purposes only and is not financial advice.

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

French presidential election: who will advance? Will Marine Le Pen qualify for the runoff in the 2027 French presidential election?. Arbitrage: 35.1% ROI, locks 26c per $1. Buy YES on PredictIt at 50c, buy NO on Kalshi / Robinhood at 24c.
Who will be the Prime Minister of Israel after the 2026 election?, Benjamin Netanyahu. Arbitrage: 19.0% ROI, locks 16c per $1. Buy YES on Kalshi / Robinhood at 13c, buy NO on PredictIt at 71c.
Who will advance in the Brazilian presidential election? Luiz Inácio Lula da Silva. Arbitrage: 13.6% ROI, locks 12c per $1. Buy YES on PredictIt at 78c, buy NO on Kalshi / Robinhood at 10c.
Who will be the next Supreme Court justice? Will Emil Bove become the next Justice on the Supreme Court?. Arbitrage: 6.0% ROI, locks 6c per $1. Buy YES on Kalshi / Robinhood at 5c, buy NO on PredictIt at 89c.
Who will win the 2028 US presidential election?, Gavin Newsom. Arbitrage: 5.5% ROI, locks 5c per $1. Buy YES on Polymarket at 12c, buy NO on PredictIt at 83c.
French presidential election: who will advance? Will Jordan Bardella qualify for the runoff in the 2027 French presidential election?. Arbitrage: 4.2% ROI, locks 4c per $1. Buy YES on Kalshi / Robinhood at 7c, buy NO on PredictIt at 89c.
2028 Democratic presidential nominee Will Rahm Emanuel be the Democratic Presidential nominee in 2028?. Arbitrage: 3.6% ROI, locks 3c per $1. Buy YES on Polymarket at 2c, buy NO on Kalshi / Robinhood at 95c.
2028 Democratic presidential nominee Will Kamala Harris be the Democratic Presidential nominee in 2028?. Arbitrage: 3.3% ROI, locks 3c per $1. Buy YES on PredictIt at 5c, buy NO on Kalshi / Robinhood at 92c.
2028 Democratic presidential nominee Will Mark Kelly be the Democratic Presidential nominee in 2028?. Arbitrage: 3.1% ROI, locks 3c per $1. Buy YES on Polymarket at 1c, buy NO on PredictIt at 96c.
Will Congress override Trump's veto? Will Congress ever override Trump's veto?. Arbitrage: 3.1% ROI, locks 3c per $1. Buy YES on Kalshi / Robinhood at 3c, buy NO on PredictIt at 94c.

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.

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: 10 Opportunities Live Now on Polymarket, Kalshi, PredictIt (July 19, 2026)

Track these live, or poll the free API