Your App's Emails
Actually in the Inbox
Send password resets, receipts and campaigns in 4 lines of code, with built-in SPF/DKIM/DMARC so you stop landing in spam. 3,000 emails/mo free.
3,000 emails/month free for testing. Upgrade when you need custom domains and production volume.
Just 4 Lines of Code
Sign up, grab an API key, send. Test from the shared domain, then upgrade for custom domains.
Node.js SDK
import { AISend } from 'aisend-email';
const aisend = new AISend('re_your_api_key');
await aisend.emails.send({
from: 'hello@send.aisend.app',
to: 'user@example.com',
subject: 'Welcome to AISend',
html: '<p>Your first email!</p>'
});cURL
curl -X POST https://api.aisend.app/api/v1/emails \
-H "Authorization: Bearer re_your_api_key" \
-H "Content-Type: application/json" \
-d '{
"from": "hello@send.aisend.app",
"to": "user@example.com",
"subject": "Welcome to AISend",
"html": "<p>Your first email!</p>"
}'Production Email, Not Just Fast Email
Every feature is designed around getting a transactional email system live and observable.
Deliverability Controls
Verified domains, SPF, DKIM, DMARC guidance, bounce handling, and suppression lists built in.
Production Templates
Start from clean transactional templates for onboarding, billing, receipts, alerts, and auth flows.
Delivery Analytics
Track sent, failed, opened, clicked, bounced, and complained events from the dashboard.
Developer-First API
Clean REST API with SDK and cURL examples. Ship email in minutes.
Custom Domains
One-click domain setup with automated SPF, DKIM, and DMARC verification.
Webhooks & Events
Real-time delivery events — sent, delivered, opened, clicked, bounced — via webhooks.
Automatic Suppression
Bounces and complaints are suppressed automatically, so you protect your sender reputation without writing any logic.
Resend-Compatible
Speaks the same request format as Resend. Migrate by changing one base URL and swapping your key.
Built for AI Agents
One API call to sign up. Claude, GPT, and any AI agent can send emails programmatically.
Built for Developers Who Need Reliable Email
A focused API for product emails: auth, onboarding, billing, alerts, and lifecycle messages.
3,000
Free emails / month
$14
Pro: 50k emails/mo (Resend $20)
2 min
Time to first send
1 line
To migrate from Resend
Resend-compatible API
Same request format as Resend. Migrate by changing one base URL and swapping your key — no code rewrite.
Built-in MCP server
Drop AISend into Claude, Cursor, or any MCP client so your AI agents can send email as a native tool.
Honest, flat pricing
3,000 emails/month free, no credit card. Pro is 50,000 emails for $14/mo — about 30% cheaper than Resend.
Try the API
See how simple it is to send an email with AISend. One POST request, one JSON body.
Request
curl -X POST https://api.aisend.app/api/v1/emails \
-H "Authorization: Bearer re_your_api_key" \
-H "Content-Type: application/json" \
-d '{
"from": "hello@send.aisend.app",
"to": "user@example.com",
"subject": "Welcome!",
"html": "<p>Your first email!</p>"
}'Response
HTTP/1.1 201 Created
{
"id": "em_8f3k2j1m"
}Click "Try it" to see the response
Email as a tool for AI agents
AISend ships an MCP server, so Claude, Cursor, and any MCP-compatible assistant can send email, check delivery, and validate addresses — no glue code required.
One-line MCP setup
Add aisend-mcp to your client config and your agent gets send_email, get_email_status, validate_email, and more as native tools.
Zero-config agent signup
No key yet? An agent can call agent-signup (or the agent_signup MCP tool) to create an account and get an API key in one request.
Automatic suppression
Bounces and complaints are suppressed automatically, so agents can't quietly burn your sender reputation.
Resend-compatible
Already wired up for Resend? Point your agent at api.aisend.app, swap the key, and you're done.
AISend vs The Competition
| Feature | AISend | Resend | SendGrid |
|---|---|---|---|
| Custom Domains | Paid plans | Paid plans | Paid plans |
| Migration | Resend-compatible API | Native API | Native API |
| Transactional Templates | Yes | React Email | Visual editor |
| Delivery Events | Yes | Yes | Limited |
| Email Validation | Included | No | Paid add-on |
| Webhooks | Yes | Yes | Yes |
| Free Tier | 3,000 emails/mo | 100 emails/day | 100 emails/day |
| Resend-Compatible API | Yes | — | No |
Start Sending Product Emails Today
Test with 3,000 free emails, then upgrade to Pro when you need custom domains and production volume.
Frequently Asked Questions
What is AISend?
AISend is a transactional email API for developers and AI agents. It provides a REST API, SDKs, and an MCP server for sending transactional emails like password resets, receipts, and verification codes. It is built on AWS SES and handles bounce and complaint suppression automatically.
How is AISend different from Resend or SendGrid?
AISend uses the same request format as Resend, so migrating is a one-line base-URL change. It is about 30% cheaper at the Pro tier (50,000 emails for $14/mo vs Resend's $20), and it ships an MCP server so AI agents can send email as a native tool.
What does the free tier include?
The free tier includes 3,000 emails per month, webhooks, delivery analytics, and the MCP server. No credit card required to start. Custom sending domains are available on paid plans.
Can I migrate from Resend to AISend?
Yes. AISend speaks the same request format as Resend. Point your client at api.aisend.app (or use the /emails alias with no /api/v1 prefix) and swap your API key — no code rewrite needed.
What email provider does AISend use?
AISend sends through AWS SES. Bounces and complaints are processed via SES notifications and suppressed automatically to protect your sender reputation.
Is AISend secure?
Data is encrypted in transit and at rest. Custom domains are authenticated with DKIM, SPF, and DMARC. API keys are hashed and never stored in plain text.