# Prediction Market Arbitrage: 8 Opportunities Surfaced, Up to 250% ROI Live Now _Our cross-venue engine has identified 8 prediction market arbitrage opportunities, with 7 currently live offering guaranteed returns across Polymarket, Kalshi/Robinhood, and PredictIt._ **Published:** 2026-08-26 **Source:** https://www.startuphub.ai/ai-news/prediction-markets/2026/prediction-market-arbitrage-8-opportunities-surfaced-up-to-250-roi-live-now --- StartupHub.ai's proprietary cross-venue engine has surfaced 8 prediction market arbitrage opportunities as of August 26, 2026. These opportunities involve the same real-world event being priced on two different venues, allowing for a guaranteed payout by buying 'YES' on one and 'NO' on the other for a combined cost under $1. An arbitrage lock is a risk-free profit opportunity where you can buy both outcomes of an event for less than the total payout, guaranteeing a return. While 7 of these spreads are live right now, prediction market prices move quickly. Any opportunities opened in the last few hours may have already closed. Arbitrage ROI by event. Which party will win the 20...: ROI % 250.88. Who will leave Trump's Cabi...: ROI % 9.29. Who will leave Trump's Cabi...: ROI % 7.53. French presidential electio...: ROI % 7.35. Where will Putin and Zelens...: ROI % 3.9. Who will win the 2028 Democ...: ROI % 3.36. Cross-venue spreads on August 26, 2026. Source: StartupHub.ai arbitrage engine. **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? for Republican**. Arbitrage: 250.9% ROI, locks 72c per $1. Buy YES on [Polymarket](https://polymarket.com/event/south-carolina-senate-election-winner?via=startup-hub-ai) at 14c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8375/Which-party-will-win-the-2026-US-Senate-election-in-South-Carolina) at 15c. - **Who will leave Trump's Cabinet next? Will Pete Hegseth be the next person to leave the Trump Cabinet?**. Arbitrage: 9.3% ROI, locks 8c per $1. Buy YES on [Kalshi / Robinhood](https://kalshi.com/markets/kxcabout) at 14c, buy NO on [Polymarket](https://polymarket.com/event/who-will-leave-trump-administration-before-2027?via=startup-hub-ai) at 78c. - **Who will leave Trump's Cabinet next? Will Doug Collins be the next person to leave the Trump Cabinet?**. Arbitrage: 7.5% ROI, locks 7c per $1. Buy YES on [Kalshi / Robinhood](https://kalshi.com/markets/kxcabout) at 3c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8850/Who-will-be-the-next-Cabinet-member-to-leave-office) 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](https://polymarket.com/event/next-french-presidential-election?via=startup-hub-ai) at 0c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxfrpresadvance) at 93c. - **Where will Putin and Zelenskyy next meet? Will Putin and Zelenskyy meet next in Ukraine?**. Arbitrage: 3.9% ROI, locks 4c per $1. Buy YES on [Polymarket](https://polymarket.com/event/where-will-zelenskyy-and-putin-meet-next?via=startup-hub-ai) at 0c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxputinzelenskyylocation) at 96c. - **Who will win the 2028 Democratic presidential nomination? for Jon Ossoff**. 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 15c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8153/Who-will-win-the-2028-Democratic-presidential-nomination) at 82c. - **2028 Democratic presidential nominee Will Gavin Newsom be the Democratic Presidential nominee in 2028?**. Arbitrage: 3.1% ROI, locks 3c per $1. Buy YES on [Kalshi / Robinhood](https://kalshi.com/markets/kxpresnomd) at 13c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8153/Who-will-win-the-2028-Democratic-presidential-nomination) at 84c. - **Where will Putin and Zelenskyy next meet? Will Putin and Zelenskyy meet next in Switzerland?**. Combined cost 90c (no lock right now). Buy YES on [Polymarket](https://polymarket.com/event/where-will-zelenskyy-and-putin-meet-next?via=startup-hub-ai) at 0c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxputinzelenskyylocation) at 90c. [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. © StartupHub.ai. All rights reserved. You may not republish this article in full without a license. Search engines and AI research tools may crawl and summarize for reference. Bulk reproduction or model training on this content requires a license. See https://www.startuphub.ai/terms.