Third-party cookies once did most of the measurement work in digital advertising. They followed people across sites, tied ad views to purchases, and fed campaign optimisation. That era is over, and the useful question in 2026 is what replaced it on Snap.
How the cookie era actually ended
When we first wrote about this shift in 2023, the deprecation still looked like a scheduled event. Digital advertising was worth around $600 billion a year, and at the time 83% of US advertisers were still relying on third-party cookies. Apple had switched them off in Safari back in 2020, and Google, after pushing its deadline twice, had committed to removing them from Chrome in 2024.
Chrome never followed through. Google dropped the full deprecation in 2024 and left third-party cookies in place. It mattered less than expected. Safari and Firefox block them by default, GDPR and CCPA made consent the precondition for tracking, and users decline when asked. Whatever Chrome ships, third-party cookies no longer carry enough signal to measure a campaign on.
What first-party data changes
The replacement is data your customers give you directly: emails, phone numbers, names, collected with consent on your own properties. These identifiers, hashed before they leave your systems, are what Snap matches against to attribute conversions and build audiences.
Timing matters here. First-party data degrades as it sits. Emails go stale, phone numbers change, and duplicate records pile up. The longer an advertiser waits to put it to work, the messier it gets, and messy data feeds straight through to weaker campaign performance and misallocated budget.
How Snap’s Conversions API works
Snap’s Conversions API is a server-to-server integration that sends conversion events from your website’s backend directly to Snap, each event carrying hashed first-party identifiers instead of cookie IDs. Your server transmits events such as ViewContent, AddToCart, and Purchase over a server-side connection rather than depending on a pixel firing in the browser.
The pixel usually stays. Snap recommends running both paths, deduplicated by a shared event ID: the pixel carries real-time browser context, the server-side stream carries completeness. Ad blockers, cookie caps, and consent prompts thin out the pixel; the server path does not leak the same way.
Direct build or partner setup
There are two ways in. A direct integration means your engineers build the collection infrastructure, handle the hashing and privacy requirements, and maintain the connection as Snap’s spec changes. A partner integration hands that work off. Datahash is a Snapchat Marketing Partner, and a standard Snap Web CAPI setup through the platform is live in 15 minutes, with consented identifiers hashed at source.
See a live setup of Snap Web CAPI and check what your current pixel is missing.