Migrate from Resend

Overview

Unosend’s API is designed to be a drop-in replacement for Resend. Most code changes are just updating the base URL and API key. Why switch:

Lower pricing — 100K emails for $50/mo vs Resend's$ 80/mo
Unlimited broadcasts — no separate broadcast limits
SMS + WhatsApp — multi-channel from one API
Self-hosted MTA — full control over deliverability

Migration Steps

1. Create Your Unosend Account

Sign up at unosend.co/signup
Add and verify your sending domain
Generate an API key from the dashboard

2. Update Your API Key

Replace your Resend API key with your Unosend key:

- RESEND_API_KEY=re_xxxxxxxxxxxx
+ UNOSEND_API_KEY=un_xxxxxxxxxxxx

3. Update the Base URL

- https://api.resend.com
+ https://www.unosend.co/api/v1

4. Update Your Code

Node.js
Python
cURL

Before (Resend):

import { Resend } from 'resend';
const resend = new Resend('re_xxxx');

await resend.emails.send({
  from: 'hello@yourdomain.com',
  to: ['user@example.com'],
  subject: 'Hello',
  html: '<p>Welcome!</p>'
});

After (Unosend):

import { Unosend } from 'unosend';
const unosend = new Unosend('un_xxxx');

await unosend.emails.send({
  from: 'hello@yourdomain.com',
  to: ['user@example.com'],
  subject: 'Hello',
  html: '<p>Welcome!</p>'
});

The request body is identical — only the import and API key change.

Before (Resend):

import resend
resend.api_key = "re_xxxx"

resend.Emails.send({
    "from": "hello@yourdomain.com",
    "to": ["user@example.com"],
    "subject": "Hello",
    "html": "<p>Welcome!</p>"
})

After (Unosend):

import unosend
client = unosend.Client(api_key="un_xxxx")

client.emails.send(
    from_email="hello@yourdomain.com",
    to=["user@example.com"],
    subject="Hello",
    html="<p>Welcome!</p>"
)

Before (Resend):

curl -X POST https://api.resend.com/emails \
  -H "Authorization: Bearer re_xxxx" \
  -H "Content-Type: application/json" \
  -d '{"from":"hello@yourdomain.com","to":["user@example.com"],"subject":"Hello","html":"<p>Welcome!</p>"}'

After (Unosend):

curl -X POST https://www.unosend.co/api/v1/emails \
  -H "Authorization: Bearer un_xxxx" \
  -H "Content-Type: application/json" \
  -d '{"from":"hello@yourdomain.com","to":["user@example.com"],"subject":"Hello","html":"<p>Welcome!</p>"}'

Same JSON body — just change the URL and key.

5. Update DNS Records

Remove Resend’s DNS records and add Unosend’s:

Type	Name	Value
TXT	`unosend._domainkey`	Your DKIM public key (from dashboard)
MX	`send`	`10 mail.unosend.co`
TXT	`send`	`v=spf1 include:_spf.unosend.co ~all`

API Compatibility

Feature	Resend	Unosend	Notes
Send email	`POST /emails`	`POST /v1/emails`	Same body format
Get email	`GET /emails/{id}`	`GET /v1/emails/{id}`	Same response
Batch send	`POST /emails/batch`	`POST /v1/emails/batch`	Same body format
Domains	`/domains`	`/v1/domains`	Same CRUD
API keys	`/api-keys`	`/v1/api-keys`	Same CRUD
Audiences	`/audiences`	`/v1/audiences`	Same CRUD
Contacts	`/audiences/{id}/contacts`	`/v1/contacts`	Slightly different path
Webhooks	Svix-based	Native	Different webhook format

Pricing Comparison

Emails/Month	Resend	Unosend	Savings
5,000	Free	Free	—
50,000	$40/mo	$20/mo	50%
100,000	$80/mo	$50/mo	37%
500,000	Custom	$340/mo	—
1,000,000	Custom	$600/mo	—

Plus Unosend includes: unlimited broadcasts, SMS, WhatsApp, and email validation — all in one platform.

Quick Start Guide

Get sending in under 5 minutes

Getting Started

Guides

Integrations

Migration

Tools

Resources

Migrate from Resend

Overview

Migration Steps

1. Create Your Unosend Account

2. Update Your API Key

3. Update the Base URL

4. Update Your Code

5. Update DNS Records

API Compatibility

Pricing Comparison

Quick Start Guide

Getting Started

Guides

Integrations

Migration

Tools

Resources

​Overview

​Migration Steps

​1. Create Your Unosend Account

​2. Update Your API Key

​3. Update the Base URL

​4. Update Your Code

​5. Update DNS Records

​API Compatibility

​Pricing Comparison

Quick Start Guide

Overview

Migration Steps

1. Create Your Unosend Account

2. Update Your API Key

3. Update the Base URL

4. Update Your Code

5. Update DNS Records

API Compatibility

Pricing Comparison