Privacy Policy

Last updated: October 29, 2026

Draft. This page explains what Heycast knows about you and why. Short version: Heycast mostly shows public Farcaster data, keeps very little about you, and never sells it.

Public Farcaster data

Farcaster is public. Heycast reads public casts, profiles, channels, follows and reactions, and saves copies of public questions, answers and discussions in its database so pages load quickly. This includes your public Farcaster ID (FID), username, display name, profile picture and bio.

When you sign in

• Sign-in is handled by Privy using your Farcaster account. Privy stores a session token in your browser.
• If you let Heycast post for you, a Farcaster signer is created through Neynar so we can publish the casts, likes and follows you ask for.
• We keep your FID and basic public profile to show your feed and who you follow.
• For private admin analytics, we record when your account is first seen and its available Farcaster username, email address, or Ethereum wallet address, looked up from Privy. These records are deleted after 90 days. Returning users may be first recorded after analytics starts.

Stored in your browser

Heycast keeps a few things in your browser’s local storage, not on our servers: your signed-in profile, which casts you’ve already seen, threads you’ve hidden, saved follow suggestions, and when the feed was last refreshed. Clearing your browser data removes them.

Site analytics

We count page views with an anonymous browser ID, page path, device category, and external referrer domain. We do not count local development visits, and we respect Do Not Track and Global Privacy Control. The admin dashboard is password protected.

Feedback on suggestions

When you act on a recommendation (for example, dismissing a suggested person or topic), we record that action with a session ID to improve suggestions. These records are deleted after 90 days.

Services we use

• Vercel hosts the site and may log basic request data such as IP address.
• Privy handles sign-in.
• Neynar and Farcaster hubs provide Farcaster data and publish casts you ask us to send.
• MongoDB stores our copy of public questions, answers and discussions.
• OpenAI (or an AI model through Vercel’s AI Gateway) helps sort and summarize public casts. We send it public cast text, not your private data.
• Link and media previews: to show a preview, our server fetches the linked page, and may use YouTube and FxTwitter for videos and X posts.

What we don’t do

We don’t sell your data, and we don’t run ads.

Your choices

You can sign out, clear your browser storage, revoke Heycast’s signer in Farcaster, or delete casts on Farcaster. To ask about data we hold, contact us below.

Changes

If this policy changes, we’ll update the date at the top.

Who we are

TODO: legal entity name and governing law have not been decided yet.

Contact

Contact @carlos on Farcaster.