Prediction Market Arbitrage: 10 Opportunities Surfa…

StartupHub.ai's proprietary cross-venue engine has just surfaced 10 prediction market arbitrage opportunities as of July 30, 2026. These opportunities arise when the same real-world event is priced differently across venues like Polymarket, Kalshi/Robinhood, and PredictIt, allowing for a risk-free profit.

An arbitrage lock occurs when buying a 'YES' contract on one venue and a 'NO' contract on another for the same event costs less than $1 combined, guaranteeing a payout of $1 regardless of the outcome. While 9 of these spreads are live now, prediction market prices move quickly, and opportunities can close without warning. It's also important to consider potential fees, KYC requirements, and withdrawal limits, which can impact actual returns. This information is for informational purposes only and not financial advice.

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

Will Trump recognize Somaliland? :: During Trump's term. Arbitrage: 50.2% ROI, locks 33c per $1. Buy YES on Polymarket at 13c, buy NO on Kalshi / Robinhood at 54c.
Who will win the 2026 Minnesota Republican nomination for governor?, Lisa Demuth. Arbitrage: 9.3% ROI, locks 8c per $1. Buy YES on Polymarket at 28c, buy NO on PredictIt at 63c.
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: 6.4% ROI, locks 6c per $1. Buy YES on PredictIt at 9c, buy NO on Kalshi / Robinhood at 85c.
Who will be the Prime Minister of Israel after the 2026 election?, Yair Lapid. Arbitrage: 5.1% ROI, locks 5c per $1. Buy YES on Polymarket at 0c, buy NO on PredictIt at 95c.
Who will win the next French presidential election?, Gérald Darmanin. Arbitrage: 4.9% ROI, locks 5c per $1. Buy YES on Polymarket at 0c, buy NO on PredictIt at 95c.
Who will be elected Greater Manchester mayor in 2026?, Bev Craig. Arbitrage: 3.7% ROI, locks 4c per $1. Buy YES on PredictIt at 96c, buy NO on Polymarket at 0c.
Who will win the 2028 US presidential election?, Gavin Newsom. Arbitrage: 3.5% ROI, locks 3c per $1. Buy YES on Polymarket at 12c, buy NO on PredictIt at 85c.
2028 Democratic presidential nominee Will Mark Kelly be the Democratic Presidential nominee in 2028?. Arbitrage: 3.5% ROI, locks 3c per $1. Buy YES on Polymarket at 3c, buy NO on Kalshi / Robinhood at 94c.
2028 Democratic presidential nominee Will Gavin Newsom be the Democratic Presidential nominee in 2028?. Combined cost 97c (no lock right now). Buy YES on Kalshi / Robinhood at 17c, buy NO on PredictIt at 80c.

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: 10 Opportunities Surfaced, 9 Live Now

Track these live, or poll the free API