# Prediction Market Arbitrage: 5 Live Opportunities on August 20, 2026 _Our cross-venue engine has identified 6 prediction market arbitrage opportunities today, with 5 still live as of August 20, 2026, offering guaranteed payouts._ **Published:** 2026-08-20 **Source:** https://www.startuphub.ai/ai-news/prediction-markets/2026/prediction-market-arbitrage-5-live-opportunities-on-august-20-2026 --- StartupHub.ai's proprietary cross-venue engine has surfaced 6 prediction market arbitrage opportunities as of August 20, 2026. These opportunities involve the same real-world event being priced on two different venues, such as Polymarket, Kalshi/Robinhood, or PredictIt, where buying a 'YES' on one venue and a 'NO' on the other costs less than $1 combined. An arbitrage lock occurs when you can simultaneously buy 'YES' on one market and 'NO' on another for the same event, with the total cost being less than $1, guaranteeing a profit regardless of the outcome. Five of these spreads are live right now, while one was seen earlier today and may have already closed. Spreads can move extremely fast, and fees, KYC requirements, and withdrawal limits can impact actual returns. Arbitrage ROI by event. Which party will win the 20...: ROI % 244.83. Where will Putin and Zelens...: ROI % 10.93. French presidential electio...: ROI % 7.35. Who will leave Trump's Cabi...: ROI % 5.26. Who will win the next Frenc...: ROI % 5.1. Will Trump recognize Somali...: ROI % 0.7. Cross-venue spreads on August 20, 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?, Republican**. Arbitrage: 244.8% ROI, locks 71c per $1. Buy YES on [Polymarket](https://polymarket.com/event/south-carolina-senate-election-winner?via=startup-hub-ai) at 11c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8375/Which-party-will-win-the-2026-US-Senate-election-in-South-Carolina) at 18c. - **Where will Putin and Zelenskyy next meet? Will Putin and Zelenskyy meet next in Switzerland?**. Arbitrage: 10.9% ROI, locks 10c 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 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. - **Who will leave Trump's Cabinet next? Will Chris Wright be the next person to leave the Trump Cabinet?**. Arbitrage: 5.3% ROI, locks 5c per $1. Buy YES on [PredictIt](https://www.predictit.org/markets/detail/8850/Who-will-be-the-next-Cabinet-member-to-leave-office) at 9c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxcabout) at 86c. - **Who will win the next French presidential election?, Gérald Darmanin**. Arbitrage: 5.1% 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. - **Will Trump recognize Somaliland? :: During Trump's term**. Combined cost 99c (no lock right now). Buy YES on [Polymarket](https://polymarket.com/event/will-trump-recognize-somaliland-before-2027?via=startup-hub-ai) at 8c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxrecogsomali) at 91c. [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.