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💌

Resend

Communications

Developer-first email API built for React

The modern email API for developers. Send emails using React components (React Email), track opens, and ensure high deliverability.

Details

Auth Type
API Key (Bearer token)
Rate Limit
10 req/s
Pricing
Free 3,000/mo; $20/mo for 50,000 emails
Full Docs
Step 1: Save your provider key

This is NOT your Callio key. Enter the API key from the provider's dashboard (e.g. OpenAI/SendGrid).

API Key (Bearer token)

1. Go to Resend Dashboard > API Keys 2. Create API Key 3. Provide it as Bearer token

Get API Credentials

Getting Started

1

Try It Instantly

Click "Try It" above to test the API in the playground

2

Add to Your Agent

Click "Add to Agent" to get your API key and integrate

Common Use Cases

React Email integration
Magic link delivery
Receipts
Marketing blasts
Newsletter distribution

💻 Code Examples

Get started quickly with these code examples in your favorite language

curl -X GET \
  'https://www.callio.dev/api/proxy/resend-email/endpoint' \
  -H 'Authorization: Bearer YOUR_CALLIO_KEY' \
  -H 'Content-Type: application/json'

💡 Tip: Replace YOUR_CALLIO_KEY with your actual Callio API key from the dashboard.

Ready to integrate Resend?

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