# Resend API

**Provider:** Resend
**Category:** communication
**Base URL:** `https://api.resend.com`
**Auth:** bearer — `Authorization: Bearer re_...`
**Rate Limit:** 10 requests/sec
**Free Tier:** Yes — [object Object]
**Pricing:** Pay per use (pay-as-you-go)
**Docs:** https://resend.com/docs

## Description

Resend is a modern email API built for developers. Send transactional emails using React components, HTML, or plain text. Features include custom domains (with DKIM/SPF auto-setup), email scheduling, batch sending, click and open tracking, webhooks for delivery events, and an email preview tool. The API is minimal, well-documented, and has first-class SDKs for Node.js, Python, Ruby, Go, PHP, and Rust. Designed to replace legacy services like SendGrid and Mailgun.

## Endpoints

| Method | Endpoint | Description |
|--------|----------|-------------|
| POST | `https://api.resend.com/emails` | Send a single email (HTML, text, or React) |
| POST | `https://api.resend.com/emails/batch` | Send up to 100 emails in one request |
| GET | `https://api.resend.com/emails/{email_id}` | Get email delivery status and metadata |
| PATCH | `https://api.resend.com/emails/{email_id}` | Cancel a scheduled email |
| GET | `https://api.resend.com/domains` | List custom sending domains |
| POST | `https://api.resend.com/domains` | Add and verify a new sending domain |

## Authentication

Create an API key at resend.com/api-keys. Pass it as a Bearer token in the Authorization header.

```
Authorization: Bearer re_...
```

## Sample Request

```bash
curl "https://api.resend.com/emails" \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H "Content-Type: application/json" \
  -X POST \
  -d '{"from":"Acme <noreply@acme.com>","to":["user@example.com"],"subject":"Your receipt","html":"<h1>Thanks for your order!</h1>"}'
```

## Sample Response

```json
{
  "id": "4ef9a417-02b3-4c80-9ff4-a3b7d28c1a3f"
}
```

## Pricing Details

Free: 3k emails/month, 1 custom domain. Pro $20/mo: 50k emails/month, unlimited domains. Enterprise: custom. All plans include full API access and real-time analytics.

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*Source: [API Map](https://apimap.dev/apis/resend/) — CC BY 4.0*