How to Connect OptinMonster with Sendloop

OptinMonster offers seamless integration with Sendloop email marketing service. Connecting OptinMonster to your Sendloop email list is very easy.

In this article, you’ll learn how to connect Sendloop with OptinMonster.

Before You Start

Here are some things to know before you begin:

Connect Sendloop

When you create a campaign in OptinMonster that you intend to collect leads with, you’ll want to integrate with one or more services to send those leads to.

To send leads to Sendloop, follow these steps:

  1. From the Integrations view of the campaign builder, click Add New Integration.
  2. Search for and select Sendloop from the dropdown field.
  3. Log into your Sendloop dashboard to obtain your API credentials. To do this:
    1. In your Sendloop dashboard, click your Account Name in the top right corner. Click the Settings link in the menu that appears.
    2. On the Settings page, select the API Settings tab in order to view your API keys.
    3. Copy the API key you would like to use. Your first API key was created for you when you first signed up with Sendloop. If you need to create a new API key, click “Create a new API key.”
  4. Returning to the OptinMonster campaign builder, paste your API Key into the corresponding field.
    Don’t forget to add a unique label for easy identification (internal use only).
  5. Click Connect to Sendloop.

  6. Once connected, select the email provider list you want to add new subscribers to.
  7. (Optional) If your campaign is collecting name and/or phone number, you can specify the custom field IDs for these fields (from Sendloop) under Lead Options.
  8. When you’re finished, click Save.

Email Automations

To send emails automatically to new leads you’ll want to configure email automations within your Sendloop account.


I’ve connected my integration and new leads are being added to my list, but OptinMonster shows 0 conversions for my campaign. Why?

Confirm that conversion tracking is turned on for the submit button in your campaign. See our guide on How to Enable Conversion Tracking.

Is it possible for me to add a phone field to my campaign?

Yes! You can add a phone field. Check out how to capture phone numbers with OptinMonster here.

Sendloop handles custom fields on a per-list basis. To store phone numbers in Sendloop, you will need to create a custom field in your Sendloop email marketing list. Custom fields are added to each list individually, so if you would like to collect phone numbers on more than one list, you will need to repeat this process for each list. To do this, follow these steps:

  1. From your Sendloop dashboard, select Subscribers from the top menu. Then, select the list you would like to add a phone field to.
  2. On the next page, you will see an overview of your list. Click Add a new custom field under Custom Fields in the column on the right.
  3. Choose the type of field you’d like to add and add a custom label (optional). Click the Create button to add the field to your list.
  4. Once your custom field has been added successfully, click on the field from your list overview page.
  5. Copy your custom field’s unique ID and save it within your Sendloop integration in OptinMonster for the appropriate field and paste it in the corresponding Lead Options field in your Sendloop integration in OptinMonster.
How do I enable double opt-in with Sendloop?

Sendloop handles the subscription mode on a per-list basis. New lists in Sendloop are configured with double opt-in by default. To change the subscription mode for your list, follow these steps:

  1. From your Sendloop dashboard, select Subscribers from the top menu. Then, select the list you would like to edit.
  2. From your list overview page, click on the Settings tab.
  3. Change the Subscription mode for your list to “subscribe after double opt-in confirmation” or “subscribe immediately” (single optin).
Can I use Sendloop segments with my OptinMonster campaign?

Segments in Sendloop are not associated with subscribers individually. They operate like smart folders where a series of rules determines which subscribers match with the segment. Because of this, Sendloop segments cannot be connected to your OptinMonster campaign. You can still use segments in Sendloop to organize subscribers after they have been added to your list.


Why am I receiving a “failed to connect” error when trying to connect Sendloop with OptinMonster?

This can happen if the API key you’re using has been revoked or if it has been configured to work on only specific IP addresses.

Check the API Settings in your Sendloop account. Make sure the API key you are using matches one of the currently active keys for your account. Also, check to make sure there are no Bound IPs associated with your API key. If necessary, try creating a new API key to connect to OptinMonster to resolve this issue.