# SendGrid API

**Provider:** Twilio SendGrid
**Category:** communication
**Base URL:** `https://api.sendgrid.com/v3`
**Auth:** bearer — `Authorization: Bearer SG...`
**Rate Limit:** 600 requests/min
**Free Tier:** Yes — [object Object]
**Pricing:** Pay per use (pay-as-you-go)
**Docs:** https://docs.sendgrid.com

## Description

SendGrid delivers 100 billion emails per year for businesses like Airbnb, Uber, and Spotify. Send transactional emails from code, design marketing campaigns with drag-and-drop templates, set up automated drip sequences, parse inbound email, and track open and click rates.

## Endpoints

| Method | Endpoint | Description |
|--------|----------|-------------|
| POST | `https://api.sendgrid.com/v3/mail/send` | Send a transactional email |
| POST | `https://api.sendgrid.com/v3/marketing/campaigns` | Create a marketing campaign |
| GET | `https://api.sendgrid.com/v3/stats` | Get email performance statistics |
| POST | `https://api.sendgrid.com/v3/templates` | Create a dynamic email template |
| GET | `https://api.sendgrid.com/v3/suppression/bounces` | Get list of bounced emails |

## Authentication

Pass your SendGrid API key as a Bearer token in the Authorization header.

```
Authorization: Bearer SG...
```

## Sample Request

```bash
curl -X POST https://api.sendgrid.com/v3/mail/send \
  -H "Authorization: Bearer $SENDGRID_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "personalizations": [{"to": [{"email": "user@example.com"}]}],
    "from": {"email": "sender@yourdomain.com"},
    "subject": "Welcome!",
    "content": [{"type": "text/plain", "value": "Thanks for signing up."}]
  }'
```

## Sample Response

```json
HTTP 202 Accepted
# No body returned on success
# Check X-Message-Id header:
X-Message-Id: 5aH6dM1sT2KABZvhJ-wr0A
```

## Pricing Details

Free: 100 emails/day. Essentials: $19.95/mo (50k emails). Pro: $89.95/mo (100k emails). Overage ~$0.00133/email on Essentials.

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