# Prediction Market Arbitrage: Four Opportunities Live on July 16, 2026 (July 16, 2026)

_Our cross-venue engine has identified four live prediction market arbitrage opportunities as of July 16, 2026, allowing for a guaranteed payout by betting on both sides of the same event._

**Published:** 2026-07-16
**Source:** https://www.startuphub.ai/ai-news/prediction-markets/2026/prediction-market-arbitrage-four-opportunities-live-on-july-16-2026-july-16-2026

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StartupHub.ai's proprietary cross-venue engine has surfaced four live prediction market arbitrage opportunities as of July 16, 2026. These opportunities involve the same real-world event being priced on two different venues, such as Polymarket, Kalshi/Robinhood, or PredictIt, where buying 'YES' on one and 'NO' on the other totals less than $1.

For newcomers, an arbitrage lock occurs when you can buy a 'YES' contract on one platform and a 'NO' contract for the same event on another, with the combined cost being less than $1, guaranteeing a profit regardless of the outcome. It's important to remember that spreads can close rapidly, and fees, KYC requirements, and withdrawal limits can impact actual returns. This information is not financial advice.

Arbitrage ROI by event. Who will win the 2028 US pr...: ROI % 4.55. 2028 Democratic VP nominee...: ROI % 4.06. 2028 Democratic presidentia...: ROI % 3.36. 2028 Democratic presidentia...: ROI % 3.25. Cross-venue spreads on July 16, 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 win the 2028 US presidential election?, Gavin Newsom**. Arbitrage: 4.5% ROI, locks 4c 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 84c.
- **2028 Democratic VP nominee Will Josh Shapiro be the nominee for the Vice Presidency for the Democratic party?**. Arbitrage: 4.1% ROI, locks 4c per $1. Buy YES on [Kalshi / Robinhood](https://kalshi.com/markets/kxvpresnomd) at 4c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8799/Who-will-win-the-2028-Democratic-vice-presidential-nomination) at 92c.
- **2028 Democratic presidential nominee Will Rahm Emanuel be the Democratic Presidential nominee in 2028?**. Arbitrage: 3.4% 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.
- **2028 Democratic presidential nominee Will Mark Kelly be the Democratic Presidential nominee in 2028?**. Arbitrage: 3.3% ROI, locks 3c per $1. Buy YES on [Polymarket](https://polymarket.com/event/will-mark-kelly-win-the-2028-democratic-presidential-nomination-479) at 1c, buy NO on [PredictIt](https://www.predictit.org/markets/detail/8153/Who-will-win-the-2028-Democratic-presidential-nomination) at 96c.

[See the full live arbitrage board](https://www.startuphub.ai/arbitrage) or poll the [JSON API](https://www.startuphub.ai/api/v1/arbitrage).

## Track these live, or poll the 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 JSON API and an MCP tool, so a trading agent can poll live Polymarket, Kalshi and PredictIt arbitrage opportunities and act on them.

```
curl -H "Authorization: Bearer sk_live_..." 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.*

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Original analysis from [startuphub.ai](https://www.startuphub.ai), the #1 AI startup directory.

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