# Prediction Market Arbitrage: 6 Opportunities Live Now, Up to 277% ROI _Our cross-venue engine has identified six live prediction market arbitrage opportunities, allowing users to lock in guaranteed profits by betting on the same event across different platforms._ **Published:** 2026-08-29 **Source:** https://www.startuphub.ai/ai-news/prediction-markets/2026/prediction-market-arbitrage-6-opportunities-live-now-up-to-277-roi --- For those new to prediction markets, an arbitrage lock occurs when you can buy a 'YES' contract on one venue and a 'NO' contract on another for the same real-world event, with their combined cost being less than $1. This guarantees a payout, regardless of the outcome, as one of your contracts will always resolve to $1. As of August 29, 2026, our engine has surfaced six such opportunities across Polymarket, Kalshi/Robinhood, and PredictIt. These spreads can close rapidly, and potential returns are subject to fees, KYC requirements, and withdrawal limits on each platform. This information is for educational purposes only and is not financial advice. Arbitrage ROI by event. Which party will win the 20...: ROI % 277.36. Will Trump recognize Somali...: ROI % 55.4. Where will Putin and Zelens...: ROI % 18.41. Who will leave Trump's Cabi...: ROI % 7.53. French presidential electio...: ROI % 7.35. Where will Putin and Zelens...: ROI % 3.9. Cross-venue spreads on August 29, 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: 277.4% ROI, locks 74c 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 13c. - **Will Trump recognize Somaliland? :: During Trump's term**. Arbitrage: 55.4% ROI, locks 36c per $1. Buy YES on [Polymarket](https://polymarket.com/event/will-trump-recognize-somaliland-before-2027?via=startup-hub-ai) at 9c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxrecogsomali) at 55c. - **Where will Putin and Zelenskyy next meet? Will Putin and Zelenskyy meet next in Switzerland?**. Arbitrage: 18.4% ROI, locks 16c 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 84c. - **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. [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.