The first 100,000 emails every month are free. After that, you pay $1 USD for each additional block of 100,000 sends — rounded up to the next whole block. No subscriptions, no seat fees, no credit card required to start.
Step 1 · Free cushion
$0
Covers your first 100k outbound emails per calendar month — templates, consent mail, and marketing to opted-in recipients, one shared bucket.
Step 2 · Beyond 100k
$1 / 100k
Each incremental 100,000-send slice is billed at a flat dollar — so scaling cost is trivial to reason about before you integrate.
monthly_charge = ⌈ max(0, sends − 100,000) / 100,000 ⌉
Monthly sends
100,000
included free
You pay
$0
Monthly sends
500,000
400k beyond free → 4 × $1
You pay
$4
Monthly sends
1,000,000
900k beyond free → 9 × $1
You pay
$9
Monthly sends
10,000,000
9.9M beyond free → 99 × $1
You pay
$99