Stripe Webhook + Email Cost Calculator

Estimate your monthly cost for running a Stripe webhook with email automation. Pure client-side; nothing logged. Numbers update as you type.

Inputs

Successful checkouts per month Email provider Emails sent per checkout (customer + founder = 2) Hosting

Estimated monthly cost

function invocations—

hosting base—

email volume—

email cost—

total / month—

Choose your inputs.

Want this wired in your repo without comparing tiers?

$199 flat (first 3 clients, then $399). Default stack is Resend + Vercel — drop-in for the most cost-effective combo. Other providers / hosts wired on request.

See the offer →

Assumptions

Stripe sends 6 events per checkout on average (checkout.session.completed + payment_intent.created + payment_intent.succeeded + charge.succeeded + payment.succeeded + ignored). All hit your webhook endpoint = function invocations.
Resend: $0 for first 3,000/mo, then $20/mo flat for 50k. $0.001/email equivalent at scale.
Postmark: $15/mo for 10,000 emails ($0.0015/email).
SendGrid: $19.95/mo for 50,000 emails ($0.0004/email at scale).
AWS SES: $0.10 per 1,000 emails ($0.0001/email) — cheapest, but harder setup and deliverability work falls on you.
Vercel Hobby: 100k function invocations/mo free. Above that, Pro plan ($20/mo) covers 1M invocations.
Cloudflare Workers: $5/mo bundled with 10M requests included.
Render Web Service: $7/mo for the smallest instance, unlimited invocations within the always-on container.

Numbers are first-order estimates. Actual cost depends on bandwidth, retries, free-tier credits, and other vendor specifics. For accuracy at scale, check each provider's pricing page directly.