The best free email API for developers. Transactional email API with no consent needed. Email marketing API to opted-in recipients. 100k/month free.
“GoodSender is bringing permission back to the inbox. It's the most builder-friendly way to scale transactional mail without the tax.”
The simplest send email API on the market. A free email sending API for transactional email — confirmations, notifications, password resets — no consent needed.
curl -X POST https://api.goodsender.com/v1/emails/send \
-H "Authorization: Bearer <your-api-key>" \
-H "Content-Type: application/json" \
-d '{
"emails": [
{
"from": { "email": "sender@example.com", "name": "Example Sender" },
"to": [{ "email": "recipient@example.com" }],
"subject": "Hello from GoodSender",
"markdown": "## Hello from GoodSender\nYour first email is on the way."
}
]
}'No template language. No rendering pipeline. Pass the model output directly — we handle the conversion to bulletproof email HTML.
By confirming intent, your emails bypass the “Promotions” tab and land directly in front of the user. ISPs love permission-first senders. We reward that behavior by footing the bill.
Our transactional email API sends password resets, receipts, and order confirmations without requiring prior recipient consent. Call the API, pick a template, done.
Confirm a new address on signup or account creation.
Deliver a secure reset link with a single API call.
Re-verify when a user updates their email address.
One-time passcodes for 2FA and passwordless login.
Transparent email API pricing. Free email API — 100k emails/month at zero cost. Need more? $1 per 100k. Here's how we compare to SendGrid API, Mailgun API, and Amazon SES API:
First 100k emails/month free — with recipient permission.
Beyond your free 100k — $1 per additional 100k. No subscriptions, no surprises.
Transactional templates — receipts, resets, confirmations — don't require permission.
swipe swipe to compare
| PROVIDER | 100K/MO | 500K/MO | 1M/MO | 10M/MO |
|---|---|---|---|---|
| Resend | $35 | $350 | $650 | CUSTOM |
| Sengrid (Twilio) | $34.95 | $499 | $799 | CUSTOM |
| Mailtrap | $30 | $300 | $750 | CUSTOM |
| Mailgun | $75 | $400 | $700 | CUSTOM |
| Amazon SES | $10-12 | $50-60 | $100-120 | CUSTOM |
| GoodSender | $0 | $4 | $9 | $99 |
Compare GoodSender vs SendGrid API · Mailgun API · Amazon SES API (AWS SES API)
// DATA_SNAPSHOT: NOV_2025 // SOURCE: PUBLIC_PRICING
Send a confirm request to any email address. It takes 150ms.
They click a link in a standard, high-reputation system email.
The recipient is unlocked for your API key globally. Send away.
Need enterprise-grade volume?
Check out Laneful →Add your domain, get an API key, and send your first email in under 10 minutes.