# Prediction Market Arbitrage: 11 Opportunities Live Now, Up to 66% ROI (July 20, 2026) _Our cross-venue engine has identified 11 live prediction market arbitrage opportunities as of July 20, 2026, offering guaranteed payouts by exploiting price discrepancies._ **Published:** 2026-07-20 **Source:** https://www.startuphub.ai/ai-news/prediction-markets/2026/prediction-market-arbitrage-11-opportunities-live-now-up-to-66-roi-july-20-2026 --- Today, July 20, 2026, StartupHub.ai's proprietary cross-venue engine has surfaced 11 live prediction market arbitrage opportunities. These opportunities arise when the same real-world event is priced differently across multiple platforms like Polymarket, Kalshi/Robinhood, and PredictIt, allowing for a risk-free profit. An arbitrage lock occurs when buying 'YES' on one venue and 'NO' on another for the same event costs less than $1 in total, guaranteeing a payout of $1 regardless of the outcome. While 11 opportunities are live right now, it is important to remember that spreads can close very quickly, and fees, KYC requirements, and withdrawal limits on individual platforms will impact actual returns. Arbitrage ROI by event. Who will be the Prime Minis...: ROI % 66.11. Will Alexandria Ocasio-Cort...: ROI % 53.85. French presidential electio...: ROI % 35.14. Who will advance in the Bra...: ROI % 13.64. Will Congress override Trum...: ROI % 6.38. Who will be the next Suprem...: ROI % 6.04. Cross-venue spreads on July 20, 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?, Benjamin Netanyahu**. Arbitrage: 66.1% ROI, locks 40c per $1. Buy YES on [Kalshi / Robinhood](https://kalshi.com/markets/kxnextisraelpm) at 2c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8643/Who-will-be-the-Prime-Minister-of-Israel-after-the-2026-election) at 58c. - **Will Alexandria Ocasio-Cortez win the 2028 Democratic presidential nomination?**. Arbitrage: 53.8% ROI, locks 35c per $1. Buy YES on [PredictIt](https://www.predictit.org/markets/detail/8153/Who-will-win-the-2028-Democratic-presidential-nomination) at 14c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxaocsenate) at 51c. - **French presidential election: who will advance? Will Marine Le Pen qualify for the runoff in the 2027 French presidential election?**. Arbitrage: 35.1% ROI, locks 26c per $1. Buy YES on [PredictIt](https://www.predictit.org/markets/detail/8766/Who-will-win-the-next-French-presidential-election) at 50c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxfrpresadvance) at 24c. - **Who will advance in the Brazilian presidential election? Luiz Inácio Lula da Silva**. Arbitrage: 13.6% ROI, locks 12c per $1. Buy YES on [PredictIt](https://www.predictit.org/markets/detail/8544/Who-will-win-the-2026-Brazilian-presidential-election) at 78c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxbrpresadvance) at 10c. - **Will Congress override Trump's veto? Will Congress ever override Trump's veto?**. Arbitrage: 6.4% ROI, locks 6c per $1. Buy YES on [PredictIt](https://www.predictit.org/markets/detail/8480/Will-Congress-override-a-veto-in-2026) at 23c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxvetooverride) at 71c. - **Who will be the next Supreme Court justice? Will Emil Bove become the next Justice on the Supreme Court?**. Arbitrage: 6.0% ROI, locks 6c per $1. Buy YES on [Kalshi / Robinhood](https://kalshi.com/markets/kxscourt) at 5c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8246/Who-will-be-the-next-Supreme-Court-nominee) at 89c. - **Who will win the 2028 US presidential election?, Gavin Newsom**. Arbitrage: 5.5% ROI, locks 5c per $1. Buy YES on [Polymarket](https://polymarket.com/event/will-gavin-newsom-win-the-2028-us-presidential-election) at 12c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8171/Who-will-win-the-2028-US-presidential-election) at 83c. - **French presidential election: who will advance? Will Jordan Bardella qualify for the runoff in the 2027 French presidential election?**. Arbitrage: 4.2% ROI, locks 4c per $1. Buy YES on [Kalshi / Robinhood](https://kalshi.com/markets/kxfrpresadvance) at 7c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8766/Who-will-win-the-next-French-presidential-election) at 89c. - **2028 Democratic presidential nominee Will Jon Ossoff 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 15c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8153/Who-will-win-the-2028-Democratic-presidential-nomination) at 81c. - **2028 Democratic presidential nominee Will Rahm Emanuel be the Democratic Presidential nominee in 2028?**. Arbitrage: 3.2% ROI, locks 3c per $1. Buy YES on [Polymarket](https://polymarket.com/event/will-rahm-emanuel-win-the-2028-democratic-presidential-nomination-299) at 2c, buy NO on [Kalshi / Robinhood](https://kalshi.com/markets/kxpresnomd) at 95c. [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). *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.