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  4. Resend Email API
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Resend Email API

Resend Email API provides developers with a straightforward solution for sending transactional and marketing emails while supporting multiple programming languages.

Developed by Resend

Live API
99.95%Uptime
150msLatency
1.1kStars
API KeyAuth
NoCredit Card
RESTStyle
v1Version

Reference

API Endpoints

Endpoints

Available routes, request structures, and code examples.

Sends transactional emails with templating support

Endpoint URL
https://api.resend.com/emails
Code Example
curl -X POST 'https://api.resend.com/emails' \
  -H 'Authorization: Bearer YOUR_API_KEY'
Request Payload
{
  "to": "user@example.com",
  "from": "onboarding@resend.dev",
  "html": "<strong>Hello!</strong>",
  "subject": "Welcome to Our Service"
}
Expected Response
{
  "id": "abc123def456",
  "to": "user@example.com",
  "from": "onboarding@resend.dev",
  "created_at": "2023-07-18T15:30:00Z"
}
Version:v1
Limit:100 emails/hour

Integration

Quick Start

cURL ExampleREST
curl -X GET "https://api.resend.com/emails/send"

Docs

Technical Documentation

What this API does

Resend Email API is a modern email sending solution designed to facilitate the integration of email functionality in applications. It supports sending both transactional and marketing emails, ensuring high deliverability and efficient management of email templates. The API is particularly beneficial for developers building SaaS platforms or automated notification systems, offering easy access to email services.

How it works

The API operates by allowing developers to send HTTP requests to specified endpoints to dispatch emails. The service supports integration with React Email for crafting dynamic email content. Developers can utilize comprehensive SDKs offered for multiple programming languages, including Node.js, Python, Ruby, Go, Java, PHP, C#, and TypeScript. This versatility ensures smooth integration across various development environments.

Authentication

Authentication for the Resend Email API is performed using API key authentication. Developers must include their API key in the request headers to access the API endpoints, ensuring secure transactions.

Example usage

  • POST /v1/send - Send an email using specified parameters like recipient, subject, and body.
  • GET /v1/templates - Retrieve a list of available email templates.

Limits

Developers benefit from a generous free tier, allowing up to 3,000 emails per month without needing a credit card. Further details regarding additional limits or tiers are not specified.

Ideal use cases

  • Building SaaS applications that require transactional emails.
  • Implementing notification systems for automated alerts.
  • Developing marketing campaigns with email templates.
  • Creating applications that need high email deliverability and logging features.

Examples

Real-World Applications

  • Sending transactional emails such as password resets, confirmations, and notifications
  • Automating email workflows for SaaS platforms
  • Marketing campaign email dispatch
  • Integrating rich, responsive email templates using React Email
  • Managing email templates and attachments programmatically

Evaluation

Advantages & Limitations

Advantages
  • ✓ Developer-first API design with extensive language SDKs
  • ✓ Generous free tier of 3,000 emails/month with no credit card required
  • ✓ Supports rich email content with React Email integration
  • ✓ Robust security with API key authentication and detailed logging
Limitations
  • ✗ Limited AI features currently available
  • ✗ Rate limiting may affect very high-volume users
  • ✗ Primarily focused on REST, no GraphQL or SOAP options
  • ✗ Regional availability limited to major cloud provider regions

Support

Frequently Asked Questions

Important Notice

Verify Before You Decide

Last verified · Apr 30, 2026

The details on this page — including pricing, features, and availability — are based on our last review and may not reflect the provider's current offering. Providers update their products frequently, sometimes without prior notice.

What may have changed

Pricing Plans
Features & Limits
Availability
Terms & Policies

Always visit the official provider website to confirm the latest pricing, terms, and feature availability before subscribing or integrating.

Check official site

External Resources

Documentation Official Website Pricing Details Postman Collection

API Specifications

v1
Pricing Model
Pay-as-you-go and monthly subscription plans available
Credit Card
Not Required
Response Formats
JSON
Supported Languages
8 Languages
SDK Support
Node.js, Python, Ruby, Go, Java, PHP, C#, TypeScript
Rate Limit

1200 requests per minute

Time to Hello World

Approximately 10 minutes to integrate and send first email

Free Tier

3,000 free emails per month with no credit card required

Best For

SaaS products, transactional email delivery, and developers needing quick, scalable email APIs

Not Ideal For

Extremely high volume bulk email marketing platforms requiring dedicated infrastructure

Tags

#smtp#communication#react-email#resend#free-api#transactional#email

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