Email SendingSend emails programmatically — no SMTP headaches
The Helix Email Sending API sends transactional and marketing emails with HTML templates, attachments, tracking, and delivery status. No SMTP credentials, no DNS setup, no inbox placement headaches — just one API call from your code.
- Free tier with 100 requests/month
- Fast, cached responses
- 99.9% uptime target
- Standard REST + JSON
For security, live email sending requires authentication.
Subscribe on RapidAPI to get your API key and start sending production-grade emails today.
What is the Email Sending API?
The Helix Email Sending API sends transactional and marketing emails with HTML templates, attachments, tracking, and delivery status. No SMTP credentials, no DNS setup, no inbox placement headaches — just one API call from your code.
How it works
- 1POST /send with `to`, `subject`, `body` — that's it.
- 2POST /send/template uses a saved template + variables (no inline HTML).
- 3Attachments supported (PDF, images, files up to 25MB).
- 4Delivery status webhooks: sent, delivered, opened, clicked, bounced, complained.
- 5Built on top of reputable SMTP relays — high inbox placement, low spam scores.
Endpoints
2 REST endpoints, all returning consistent JSON.
/sendSend an email
/send/templateSend from HTML template
Code in 5 languages
Copy and paste into your project. Replace YOUR_API_KEY with your RapidAPI key.
// Email Sending API
const response = await fetch(
"https://email-sending-by-helix-api.p.rapidapi.com/send",
{
method: "POST",
headers: {
"X-RapidAPI-Key": "YOUR_API_KEY",
"X-RapidAPI-Host": "email-sending-by-helix-api.p.rapidapi.com",
"Content-Type": "application/json"
},
body: JSON.stringify({ "query": "your input" })
}
);
const data = await response.json();
console.log(data);What developers build with this API
Real use cases from production deployments.
Transactional Emails (welcome, password reset)
Replace SendGrid/Postmark in your SaaS. Same deliverability, cleaner API, predictable pricing.
Triggered Marketing Emails
Cart abandonment, re-engagement, drip campaigns. Trigger from your backend events.
Notification Systems
Daily digest emails, alert emails, mention emails. Anywhere you'd use SES + boilerplate.
Receipt and Order Confirmations
Generate the PDF receipt with our PDF API, send it via this API, all in <1 second from order confirmation.
Account Verification
Send verification emails with magic links or codes. We handle bouncing/complaints automatically.
Pricing
All tiers include this API. No credit card for free tier.
BASIC
Free
- ✓ 100 reqs/month
- ✓ Hard limit
- ✓ All endpoints
PRO
$9.99/mo
- ✓ 10,000/month
- ✓ +$0.005 each
- ✓ All endpoints
ULTRA
$29.99/mo
- ✓ 100,000/month
- ✓ +$0.002 each
- ✓ All endpoints
MEGA
$99.99/mo
- ✓ 1,000,000/month
- ✓ +$0.001 each
- ✓ All endpoints
Frequently asked questions
Real answers to questions developers ask before integrating.