Prediction Market Arbitrage: 9 Opportunities Live N…

For those new to prediction markets, an arbitrage lock occurs when you can buy a 'YES' contract on one platform and a 'NO' contract for the same real-world event on another platform, with the combined cost being less than $1. This strategy guarantees a payout of $1 regardless of the outcome, locking in a profit.

As of August 14, 2026, StartupHub.ai's cross-venue engine has surfaced 9 such arbitrage opportunities across Polymarket, Kalshi/Robinhood, and PredictIt. These spreads move quickly and can close at any moment, and potential profits can be impacted by fees, KYC requirements, and withdrawal limits.

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

Where will Putin and Zelenskyy next meet? Will Putin and Zelenskyy meet next in Ukraine?. Arbitrage: 506.1% ROI, locks 84c per $1. Buy YES on Kalshi / Robinhood at 9c, buy NO on Polymarket at 8c.
Will Trump recognize Somaliland? :: During Trump's term. Arbitrage: 58.0% ROI, locks 37c per $1. Buy YES on Polymarket at 8c, buy NO on Kalshi / Robinhood at 55c.
Who will leave Trump's Cabinet next? Will Robert F. Kennedy Jr. be the next person to leave the Trump Cabinet?. Arbitrage: 17.6% ROI, locks 15c per $1. Buy YES on Kalshi / Robinhood at 16c, buy NO on Polymarket at 69c.
Who will leave Trump's Cabinet next? Will Pete Hegseth be the next person to leave the Trump Cabinet?. Arbitrage: 14.3% ROI, locks 13c per $1. Buy YES on Kalshi / Robinhood at 13c, buy NO on Polymarket at 75c.
Where will Putin and Zelenskyy next meet? Will Putin and Zelenskyy meet next in Switzerland?. Arbitrage: 9.1% ROI, locks 8c per $1. Buy YES on Polymarket at 3c, buy NO on Kalshi / Robinhood at 89c.
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.
2028 Democratic VP nominee Will Josh Shapiro be the nominee for the Vice Presidency for the Democratic party?. Arbitrage: 5.4% ROI, locks 5c per $1. Buy YES on Kalshi / Robinhood at 4c, buy NO on PredictIt at 91c.
Who will win the next French presidential election?, Gérald Darmanin. Arbitrage: 5.0% ROI, locks 5c per $1. Buy YES on Polymarket at 0c, buy NO on PredictIt at 95c.
Who will leave Trump's Cabinet next? Will Doug Collins be the next person to leave the Trump Cabinet?. Arbitrage: 3.1% ROI, locks 3c per $1. Buy YES on Kalshi / Robinhood at 2c, buy NO on PredictIt at 95c.

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: 9 Opportunities Live Now, Up to 506% ROI

Track these live, or poll the free API