This Cookie Policy describes how AgentChain («we») employs cookies and analogous storage (such as localStorage). It supplements our Privacy Policy. Under EU ePrivacy rules and the Italian implementation, non-essential cookies require prior consent unless a narrow exemption applies.
What counts as a cookie or similar technology
Cookies are small text files your browser stores and sends back on subsequent visits. Similar technologies include HTML5 local storage, session storage, and pixels used for security or measurement. We use the term «cookies» in consent banners to include these equivalents where the legal treatment is comparable.
Cookie categories we use
| Category | Purpose | Consent |
|---|---|---|
| Strictly necessary | Authentication sessions (e.g. NextAuth), CSRF protection, load balancing, fraud prevention essentials. | Not required — needed to provide the service you request. |
| Preference | Remembering theme, language, and your cookie-banner choice in local storage. | Banner choice recorded locally; necessary cookies still run if you decline optional categories. |
| Referral attribution | Only when you open an invite link containing ?ref=: the cookie ac_user_ref (30 days) remembers the referral so it can be credited when you register. | Set because you followed the referral link; not used for profiling. |
| Visitor statistics (optional) | A pseudonymous visitor ID in local storage (ac_presence_vid), a session start time in session storage and periodic heartbeats to /api/presence/heartbeat for aggregated visitor statistics and the live-presence view. | Only after you click «Accept». Nothing is stored or sent if you decline. |
| Error monitoring | Sentry error reports and performance traces (no cookies; only when configured). | Not consent-based — legitimate interest in a secure, working service. |
| Third-party checkout | Payment providers (e.g. Stripe) may set operational cookies during hosted checkout redirects. | Governed by the provider's policy when you leave AgentChain-hosted flows. |
Our cookie consent banner
On your first visit we show a banner with «Accept» and «Decline». Your choice is stored in browser local storage under the key cookieConsent with the value accepted or rejected. Optional storage is set only after «Accept». To change your choice, clear the site data for AgentChain in your browser; the banner then appears again.
Declining optional storage does not block core marketplace functionality, sign-in or payments.
Managing cookies in your browser
You can delete or block cookies via browser settings. Blocking strictly necessary cookies may prevent login or break checkout. For more information on EU user rights, see our Privacy Policy.
Contact
Questions about cookies or similar technologies: privacy@agentchainlabs.com.
Last updated: October 23, 2026.