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API Reference

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Loops

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Welcome to Loops, the platform for SaaS email.

Start here

Learn about the three types of emails that you can send with Loops: Campaigns, Loops, and Transactional.

Types of emails

A guide for creating and sending emails with Loops.

Sending your first email

Learn how to edit emails in the Loops editor.

Editing emails

Add context and personalization to emails.

Personalizing emails

Uploading a custom email

Re-use basic elements of an email or create email templates.

Duplicating emails

Font support via Google Fonts is now available in Loops.

Font support

How to send a daily, weekly or monthly email with a summary of what's happened in your app.

Scheduled digest

Loops let you send emails based on something happening, like a contact property updating, a new contact being created or an external event happening in another platform.

Guide

Learn how to trigger a Loop to start sending emails.

Triggering Loops

Learn how to pause and stop a Loop to control the sending of emails.

Pausing Loops

Branching loops allow you to send different emails based on a contact's properties within a single Loop.

Branching Loops

Events let you trigger emails when something happens in an external platform.

Learn how to use event properties to personalize your emails.

Event properties

Easily add contacts to Loops by uploading a CSV file.

CSV Upload

Connect Loops to external platforms to automatically add contacts to your audience.

Integrations

Loops provides a REST API to manage your contacts.

How to send emails to specific groups of contacts and save segments for future use.

Filters and Segments

The contact activity timeline is a great way to see all the activity for a specific contact.

Contact activity timeline

How to add, edit and delete contact properties.

Contact properties

Introduction

How to send transactional email with Loops.

How to send attachments with your transactional email.

Attachments

Loops integrates with thousands of other platforms so you can sync contacts and trigger emails from around the internet.

Overview

Collect signups from any web page with a customizable form.

Simple form

Integrate with Loops via a form endpoint, which will work with any type of custom form solution you have set up.

Custom form

Send data to Loops from supported platforms using webhooks.

Incoming webhooks

Integrate the Loops API into your Bubble app with our plugin.

Bubble

Enable sign ups to Loops using a native Carrd form.

Carrd

Send user data from your data warehouse to Loops.

Census

Enable signups from your Framer site using an Input or a custom Loops component.

Framer

Integrately

Utilize our official Make integration to manage contacts and send email.

Make

Utilize our official Segment integration to manage contacts and send email.

Segment

Configure your Supabase account to send authentication emails with Loops.

Supabase

Sync contacts and send emails triggered by events in Stripe.

Stripe

Typedream

Enable signups from your site using a native Webflow form.

Webflow

Connect Loops to thousands of apps so manage contacts and send email.

Zapier

Import emails and contacts to your CRM by adding a BCC address to your marketing emails.

Auto BCC

Steps for adding a sending domain to your account.

Setting up your domain

How we monitor sends to increase the deliverability of your emails.

Deliverability optimization

If your emails are not landing in the inbox folder you expect, here are some tips to improve your inbox placement.

Improve your inbox placement

Tips for sending emails to a large group of new contacts.

Sending to large audiences

Most email services (including Loops) prefer sending emails from subdomains (hey.company.com) over root domains (company.com).

Subdomains vs root domains

Gmail doesn't report spam reports to Loops, so setting up Google Postmaster is key to getting an idea of your deliverability performance in Gmail.

Insights from Google Postmaster

Understand how open rates can be affected by clients and networks.

Email open rates

Your email sending avatar is handled through third-party platforms like Gmail and Outlook. Here’s how to get it set up.

Add a sending avatar

A clean list is a happy list. Here’s how to keep your list clean and your emails deliverable.

Maintaining a clean list

Send with SMTP

Send transactional emails from your Django project using Loops' SMTP service.

Django

The official Loops JavaScript SDK, with full TypeScript support.

JavaScript SDK

How to update the email address you use to log in to Loops.

Change your login email

How to add and manage team members in your Loops account.

Team members

Free plan

Learn how to receive notifications about new Loops contacts in external tools.

Notifications

The Loops REST API lets you manage your contacts, send events and send transactional email.

API

Contacts

Events

Transactional emails

Custom fields

API key

API key

Request

Response

Success

Error

API

Contacts

Events

Transactional emails

Custom fields

API key

​Request

​Response

​Success

​Error

Request

Response

Success

Error