SequenzyDeveloper API

Ship Production-Ready Emails in 10 Lines of Code

A developer-first API that respects your time. Send transactional emails, manage subscribers, and trigger automations. TypeScript SDK with full type safety.

SOC 2 Compliant
99.9% Uptime
Sub-second Delivery

Why Sequenzy for Developer API?

Built for developers who want reliability without complexity.

Simple by Design

Clean RESTful endpoints. Intuitive request/response patterns. Documentation that actually helps.

TypeScript SDK

First-class TypeScript support with full type definitions. Catch errors before they ship.

Sub-Second Delivery

Transactional emails delivered in under 1 second. Your users get critical emails instantly.

Unified Platform

One API for transactional and marketing. No more juggling multiple providers.

Developer Experience

Ship emails in minutes, not days

Sequenzy's API is designed for developers who value simplicity. A few lines of code and you're sending transactional emails with enterprise-grade deliverability.

View full docs →
Send with the Sequenzy SDK
npm install sequenzy
import Sequenzy from 'sequenzy';

// Initialize the Sequenzy client
const client = new Sequenzy({ apiKey: 'your-api-key' });

// Send using a template (recommended)
const response = await client.transactional.send({
  to: 'user@example.com',
  slug: 'password-reset',
  variables: {
    RESET_LINK: 'https://app.example.com/reset?token=abc123',
    USER_NAME: 'John',
    EXPIRES_IN: '24 hours'
  }
});

// Or send with custom content (no template needed)
await client.transactional.send({
  to: 'user@example.com',
  subject: 'Password Reset Request',
  body: '<h1>Reset your password</h1><p>Click the link below...</p>',
  variables: {
    USER_NAME: 'John'
  }
});

console.log('Email queued:', response.jobId);

Type-safe SDKs

Full TypeScript support with autocomplete

Automatic retries

Built-in exponential backoff

Webhook events

Real-time delivery notifications

How it works

Get started with Sequenzy in just a few steps.

1

Get Your API Key

Generate an API key from your dashboard. Takes 30 seconds.

2

Install the SDK

npm install @sequenzy/sdk — TypeScript types included out of the box.

3

Send Your First Email

One function call with type-safe parameters. No complex configuration.

4

Monitor & Debug

Real-time logs, delivery tracking, and webhook events. See exactly what's happening.

Built for real-world use cases

See how SaaS teams use Sequenzy developer api.

Transactional Emails

Password resets, order confirmations, login notifications. Critical emails that can't wait.

Example

sequenzy.send({ to, template, data })

Event-Triggered Emails

Trigger emails based on user actions in your app. Feature activations, milestones, achievements.

Example

sequenzy.events.trigger({ email, event, properties })

Subscriber Management

Add users to lists, apply tags, update attributes. Keep your email data in sync with your app.

Example

sequenzy.subscribers.upsert({ email, tags, attributes })

Webhook Integration

Receive delivery events, opens, clicks, and bounces. Keep your systems in sync.

Built for Developers

An API that respects your time and workflow

Feature
Sequenzy
Others
TypeScript SDK
Limited
Sub-second delivery
1-5 seconds
Template variables
Handlebars
Custom/Limited
Unified API
Marketing + Transactional
Separate products
Rate limits
Generous
Strict
Documentation
Interactive
Static
Simple, transparent pricing

Start free, scale as you grow

One price for everything. No per-email fees, no hidden costs.

Save 10%
MonthlyYearly
Save 10%
Free Plan
$0/month
Unlimited contacts
FreeEnterprise
Up to 100 in sequences • 2k emails/month

All features included:

  • 100 subscribers in sequences
  • 2k emails/month
  • Visual automation builder
  • Transactional email API
  • Reply tracking & team inbox
  • Goal tracking & revenue attribution
  • Dynamic segments
  • Payment integrations(Stripe, Paddle, Lemon Squeezy)
  • Full REST API access
  • Custom sending domain
  • No "Sent with Sequenzy" branding

Start for free

Frequently Asked Questions

Everything you need to know about Sequenzy Developer API.

Bearer token authentication with API keys. Generate keys from your dashboard with specific scopes.

Yes, but generous. 100 requests/second for most endpoints. Higher limits available on request for enterprise plans.

We send webhooks for delivery events, opens, clicks, bounces, and unsubscribes. Configure endpoints in your dashboard.

Yes. The SDK is optional. All functionality is available via RESTful HTTP endpoints.

Yes. Use your test API key for development. Emails go to a sandbox instead of real inboxes.

Sub-second for transactional emails. Marketing campaigns are rate-limited for deliverability.

Yes. Send base64-encoded attachments or URLs. Max 10MB per email.

The SDK throws typed errors. HTTP responses include error codes and human-readable messages. Check our error reference docs.
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