Resend

API

Email API for sending transactional and marketing email

Price: Free tier, then paid
Access: API key

Docs
OpenAPI
llms.txt

About

Email API for developers, with a REST API, SMTP and official SDKs in several languages. It sends transactional email and marketing broadcasts and can receive inbound mail. The free plan is capped at 100 emails a day.

What you can do with it

Send transactional email from your app over REST or SMTP
Send broadcasts to your contact lists
Receive inbound email as a webhook with parsed contents

Get started

Create an API key
Verify your sending domain

Example

curl -X POST https://api.resend.com/emails \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"from":"Acme <onboarding@resend.dev>","to":["delivered@resend.dev"],"subject":"hello world","html":"<p>it works!</p>"}'

Details

Hosting: Hosted service
Available in: Worldwide
Official SDKs: JavaScript/TypeScript, PHP, Python, Ruby, Go, Java, Rust, C#
MCP server: Remote