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2 resources from Eightx we point founders to, and the questions each answers.

📄 Article
✓ Link checked Free Beginner

Why we picked it If full incrementality testing is more than your team can run right now, blended metrics are the honest shortcut, and this article lays them out cleanly. Blended CAC (total spend divided by all new customers) and MER (total revenue divided by total spend) cannot be gamed by any single platform, because they count every rupee of spend against every real customer. For a small team building outside the big startup hubs, this is the most practical way to stop the platforms from grading their own homework.

ROAS vs MER vs Blended CAC: Which Metric Actually Matters

From Eightx by Matt Putra About a 10 minute read

  • Blended CAC counts all spend against all new customers, so no channel gets to claim cheap wins it did not earn.
  • MER gives you the business level truth: is total spend actually turning into total revenue, across paid, organic, email, and referral.
  • Watch both together. A healthy MER can still hide a CAC your unit economics cannot support.
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Answers How do I stop platform-reported conversions from lying to me about what's actually driving sales?
📄 Article
✓ Link checked Free Beginner

Why we picked it This is a focused, plain-language piece on the exact trap in the question: a low blended CAC that quietly counts customers you never paid to acquire (word of mouth, referrals, your own network). It gives a concrete worked example where blended reads 42 dollars but true paid CAC is 70, and shows how to isolate the paid number using CRM-attributed customers rather than ad-platform counts. A good starting point for pressure-testing whether your economics survive without the promo.

What Is Blended CAC vs Paid CAC?

From Eightx by Matt Putra Short read (10 to 12 min)

  • Blended CAC divides total spend by every new customer including free channels, so a founder-led discount or your personal network can make the headline number look far better than the paid engine really is.
  • To find your true paid CAC, divide full paid spend (media, agency, creative, affiliate) by customers acquired through paid channels, measured at your CRM.
  • Report both numbers and never compare your blended CAC to a competitor's paid CAC, because the gap is where scaling ads later goes wrong.
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Answers My CAC looks great but I paid for it with a founder-led discount. How do I know my unit economics without the promo?