Which channel brings paying customers?

The short answer

Astra ranks every acquisition channel by paying customers (not signups) and tells you which to double down on. She pulls the last 90 days from GA4 + PostHog + post-signup survey, attributes each Stripe paid signup to its real channel source, then computes per-channel: paid customer count, CAC, LTV, payback period, signup-to-paid conversion rate. The output is a Lark report ranked by 'paid customers per dollar spent' — the metric that actually matters. The signup volume leader and the paying customer leader are usually different channels by 2-3 ranks. Common pattern: paid social drives volume but converts poorly; organic search and partnerships drive low volume but convert at 3-5x. The recommendation each week is one specific reallocation: cut $X from worst channel, redirect to best. Most teams realize they should be spending 60% less on the channel they're spending 60% on.

How Astra actually does it

1. 1

   Attribute paid signups to channel

   Stripe paid signups last 90 days. Match each to original channel via GA4 first-touch + PostHog + self-report. Resolve conflicts.

   StripeGA4PostHog
2. 2

   Compute per-channel economics

   Per channel: paid customer count, CAC (true cost / paid count), LTV (cohort retention × gross profit), payback period, signup-to-paid %.

3. 3

   Rank by paying customers per dollar

   Sort by ROI = paid customers / dollar spent. Volume leader and ROI leader often differ — that's the actionable gap.

4. 4

   Identify the reallocation move

   One specific recommendation: cut $X from lowest-ROI channel, redirect to highest-ROI channel that has scaling room. Project impact on paid customers next month.

5. 5

   Weekly report + monthly deep-dive

   Weekly Lark report on top 5 channels by paid customers + the recommended reallocation. Monthly: full attribution model audit and confidence scoring.

   Lark

What it looks like in chat