Mailchimp is one of the world's most widely used email marketing platforms, offering list management, email automation, segmentation, and campaign analytics for businesses of all sizes.

CPV One integrates with Mailchimp to solve one of the biggest attribution problems in performance marketing: knowing which ads generate leads that actually convert through email follow-up.

When you run a lead generation campaign, visitors come from a paid source (Facebook, Google, TikTok, native ads), opt in, and enter a Mailchimp email sequence.

CPV One tracks the original click and connects it to any conversion that happens later through Mailchimp — even if that conversion happens days or weeks later.

This also works in CPV Lab (self-hosted version).

With this integration, you can:

• Track conversions that happen as a result of Mailchimp email campaigns
• Connect email-driven conversions to the original paid ad that generated the subscriber
• Pass those conversions to Facebook CAPI or Google Ads for better lookalike audiences and campaign optimization
• Measure true cost per acquisition, not just cost per lead, across your paid campaigns
• Run smarter A/B tests on your lead capture pages knowing which variants produce buyers, not just subscribers
• Use CPV One's Email Follow-Up campaign layout to manage the full funnel from ad click to email conversion

How it works

CPV One assigns a unique click ID to every visitor who comes through your tracked campaign link.

When that visitor opts in and enters Mailchimp, their identifier travels with them. When CPV One tracking links are used inside your Mailchimp emails, any conversion click is matched back to the original session and campaign.

CPV One then fires the conversion to your traffic source, completing the attribution chain from ad → landing page → email → sale.

Why it matters

Mailchimp tells you open rates and click rates. Your ad platform tells you cost per lead. But neither tells you the full story. CPV One sits in the middle and connects both sides.

With this integration, you finally know which paid campaigns generate profitable email subscribers — and you can feed real purchase signals back to Facebook or Google to train their algorithms on buyers, not just leads.