# Arbitrage Alert: 5 Prediction Market Opportunities Live Now on Polymarket, Kalshi, and PredictIt _Our cross-venue engine has identified 5 live prediction market arbitrage opportunities, allowing for guaranteed payouts by simultaneously buying YES and NO on the same event across different platforms._ **Published:** 2026-08-03 **Source:** https://www.startuphub.ai/ai-news/prediction-markets/2026/arbitrage-alert-5-prediction-market-opportunities-live-now-on-polymarket-kalshi-and-predictit --- StartupHub.ai's cross-venue engine has surfaced five live prediction market arbitrage opportunities as of August 3, 2026. These opportunities involve the same real-world event being priced on two distinct venues, such as Polymarket, Kalshi/Robinhood, or PredictIt, where buying a 'YES' on one platform and a 'NO' on another totals less than $1, thereby locking in a guaranteed payout. An arbitrage lock occurs when you can simultaneously bet on both outcomes of an event across different platforms for a combined cost of less than $1, guaranteeing a profit regardless of the event's resolution. While five opportunities are currently live, spreads can move fast, and any others that opened in the last few hours may have already closed. It is important to remember that this is not financial advice, and factors like fees, KYC requirements, and withdrawal limits can impact actual returns. Arbitrage ROI by event. Who will be the Prime Minis...: ROI % 5.1. Who will win the next Frenc...: ROI % 4.88. Who will leave Trump's Cabi...: ROI % 4.17. 2028 Democratic presidentia...: ROI % 4.17. 2028 Democratic presidentia...: ROI % 3.36. Cross-venue spreads on August 3, 2026. Source: StartupHub.ai arbitrage engine. **Live arbitrage right now** These update automatically. Tap a leg to open the venue. Not financial advice. - **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](https://polymarket.com/event/who-will-be-the-next-prime-minister-of-israel-after-the-next-election?via=startup-hub-ai) at 0c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8643/Who-will-be-the-Prime-Minister-of-Israel-after-the-2026-election) at 95c. - **Who will win the next French presidential election?, Gérald Darmanin**. Arbitrage: 4.9% ROI, locks 5c per $1. Buy YES on [Polymarket](https://polymarket.com/event/next-french-presidential-election?via=startup-hub-ai) at 0c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8766/Who-will-win-the-next-French-presidential-election) at 95c. - **Who will leave Trump's Cabinet next? Will Pete Hegseth be the next person to leave the Trump Cabinet?**. Arbitrage: 4.2% ROI, locks 4c per $1. Buy YES on [Kalshi / Robinhood](https://kalshi.com/markets/kxcabout) at 12c, buy NO on [Polymarket](https://polymarket.com/event/who-will-leave-trump-administration-before-2027?via=startup-hub-ai) at 84c. - **2028 Democratic presidential nominee Will Gavin Newsom be the Democratic Presidential nominee in 2028?**. Arbitrage: 4.2% ROI, locks 4c per $1. Buy YES on [Kalshi / Robinhood](https://kalshi.com/markets/kxpresnomd) at 17c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8153/Who-will-win-the-2028-Democratic-presidential-nomination) at 79c. - **2028 Democratic presidential nominee Will Mark Kelly be the Democratic Presidential nominee in 2028?**. Arbitrage: 3.4% ROI, locks 3c per $1. Buy YES on [Polymarket](https://polymarket.com/event/democratic-presidential-nominee-2028?via=startup-hub-ai) at 3c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxpresnomd) at 94c. [See the full live arbitrage board](https://www.startuphub.ai/arbitrage) or poll the free [JSON API](https://www.startuphub.ai/api/v1/arbitrage). ## 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](https://www.startuphub.ai/arbitrage), 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](https://www.startuphub.ai/api-docs/reference/arbitrage) or open the [live JSON endpoint](https://www.startuphub.ai/api/v1/arbitrage). Focused guides: [Polymarket arbitrage](https://www.startuphub.ai/arbitrage/polymarket), [Kalshi arbitrage](https://www.startuphub.ai/arbitrage/kalshi), and the [arbitrage bot API](https://www.startuphub.ai/arbitrage/bot). *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.* --- Original analysis from [startuphub.ai](https://www.startuphub.ai), the #1 AI startup directory.