Privacy Policy — Master Prediction Markets

Master Prediction Markets ("we", "us", "our") operates masterpredictionmarkets.com and the OddsView iOS app. This page explains what data we collect, how we use it, and your choices.

Information We Collect

Analytics

We use Google Analytics 4 (property ID G-W07DSXGL25) to understand how visitors use the site. Google Analytics collects anonymized data such as pages visited, time on site, referral source, device type, and approximate geographic location. This data is aggregated and cannot identify you personally. You can opt out by installing the Google Analytics Opt-out Browser Add-on.

If you subscribe to our newsletter, we collect your email address via Buttondown. Your email is used solely to send our newsletter. You can unsubscribe at any time using the link in every email. We do not sell or share your email with third parties.

Advertising

We use Google AdSense to display ads. Google and its partners may use cookies to serve ads based on your prior visits to this site or other websites. You can opt out of personalized advertising at Google Ads Settings or via aboutads.info.

OddsView iOS App

The OddsView iOS app does not collect personal data, require sign-in, or use analytics. No cookies, advertising SDKs, or third-party tracking frameworks are included in the app.

Market data (odds, prices, spreads) is fetched from our API (mpm-odds-api.fly.dev). No personal information is sent with these requests.

Favorites and watchlist data are stored locally on your device using UserDefaults and are never transmitted to our servers or any third party.

Links to Kalshi and Polymarket within the app open in your system browser. Affiliate links may apply as described in the Affiliate Links section below.

Cookies

We use cookies for analytics and advertising as described above. Most browsers let you block or delete cookies through their settings. Disabling cookies may affect site functionality.

Affiliate Links

Some links on this site are affiliate links to prediction market platforms including Kalshi and Polymarket. If you sign up through these links, we may earn a referral commission at no cost to you. Affiliate relationships do not influence our editorial content or market analysis.

Third-Party Services

We use the following third-party services that may collect data:

Google Analytics — website analytics
Google AdSense — advertising
Buttondown — email newsletter
GitHub Pages / Vercel — website hosting

Each service operates under its own privacy policy. We encourage you to review their policies for details on how they handle your data.

Data Retention

Analytics data is retained according to Google's default retention settings (14 months). Newsletter subscriber data is retained until you unsubscribe. We do not store any other personal data.

Children's Privacy

This site is not directed at children under 13. We do not knowingly collect personal information from children.

Changes to This Policy

We may update this policy from time to time. Changes will be posted on this page with an updated revision date.

Contact

Questions about this privacy policy? Email us at [email protected].