MailerLite

Access the MailerLite API with managed OAuth authentication. Manage subscribers, groups, campaigns, automations, forms, fields, segments, and webhooks.

Quick Start

# List subscribers
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailerlite/api/subscribers?limit=10')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Base URL

https://gateway.maton.ai/mailerlite/{native-api-path}

Replace

{native-api-path}

with the actual MailerLite API endpoint path. The gateway proxies requests to

connect.mailerlite.com

and automatically injects your OAuth token.

Authentication

All requests require the Maton API key in the Authorization header:

Authorization: Bearer $MATON_API_KEY

Environment Variable: Set your API key as

MATON_API_KEY

export MATON_API_KEY="YOUR_API_KEY"

Getting Your API Key

Sign in or create an account at maton.ai
Go to maton.ai/settings
Copy your API key

Connection Management

Manage your MailerLite OAuth connections at

https://ctrl.maton.ai

List Connections

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections?app=mailerlite&status=ACTIVE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create Connection

python <<'EOF'
import urllib.request, os, json
data = json.dumps({'app': 'mailerlite'}).encode()
req = urllib.request.Request('https://ctrl.maton.ai/connections', data=data, method='POST')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Content-Type', 'application/json')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response:

{
  "connection": {
    "connection_id": "21fd90f9-5935-43cd-b6c8-bde9d915ca80",
    "status": "ACTIVE",
    "creation_time": "2025-12-08T07:20:53.488460Z",
    "last_updated_time": "2026-01-31T20:03:32.593153Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "mailerlite",
    "metadata": {}
  }
}

Open the returned

url

in a browser to complete OAuth authorization.

Delete Connection

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections/{connection_id}', method='DELETE')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Specifying Connection

If you have multiple MailerLite connections, specify which one to use with the

Maton-Connection

header:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailerlite/api/subscribers')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '21fd90f9-5935-43cd-b6c8-bde9d915ca80')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

If omitted, the gateway uses the default (oldest) active connection.

API Reference

Subscriber Operations

List Subscribers

GET /mailerlite/api/subscribers

Query parameters:

filter[status]

- Filter by status:

active

unsubscribed

unconfirmed

bounced

junk

```
limit
```
- Results per page (default: 25)
```
cursor
```
- Pagination cursor
```
include
```
- Include related data:
```
groups
```

Get Subscriber

GET /mailerlite/api/subscribers/{subscriber_id_or_email}

Create/Upsert Subscriber

POST /mailerlite/api/subscribers
Content-Type: application/json
{
"email": "subscriber@example.com",
"fields": {
"name": "John Doe",
"company": "Acme Inc"
},
"groups": ["12345678901234567"],
"status": "active"
}

Returns 201 for new subscribers, 200 for updates.

Update Subscriber

PUT /mailerlite/api/subscribers/{subscriber_id}
Content-Type: application/json
{
"fields": {
"name": "Jane Doe"
},
"status": "active"
}

Delete Subscriber

DELETE /mailerlite/api/subscribers/{subscriber_id}

Get Subscriber Activity

GET /mailerlite/api/subscribers/{subscriber_id}/activity-log

Query parameters:

filter[log_name]

- Filter by activity type:

campaign_send

automation_email_sent

email_open

link_click

email_bounce

spam_complaint

unsubscribed

```
limit
```
- Results per page (default: 100)
```
page
```
- Page number (starts from 1)

Forget Subscriber (GDPR)

POST /mailerlite/api/subscribers/{subscriber_id}/forget

Group Operations

List Groups

GET /mailerlite/api/groups

Query parameters:

```
limit
```
- Results per page
```
page
```
- Page number (starts from 1)
```
filter[name]
```
- Filter by name (partial match)

sort

- Sort by:

name

total

open_rate

click_rate

created_at

(prepend

for descending)

Create Group

POST /mailerlite/api/groups
Content-Type: application/json

{
"name": "Newsletter Subscribers"
}

Update Group

PUT /mailerlite/api/groups/{group_id}
Content-Type: application/json
{
"name": "Updated Group Name"
}

Delete Group

DELETE /mailerlite/api/groups/{group_id}

Get Group Subscribers

GET /mailerlite/api/groups/{group_id}/subscribers

Query parameters:

filter[status]

- Filter by status:

active

unsubscribed

unconfirmed

bounced

junk

```
limit
```
- Results per page (1-1000, default: 50)
```
cursor
```
- Pagination cursor

Assign Subscriber to Group

POST /mailerlite/api/subscribers/{subscriber_id}/groups/{group_id}

Remove Subscriber from Group

DELETE /mailerlite/api/subscribers/{subscriber_id}/groups/{group_id}

Campaign Operations

List Campaigns

GET /mailerlite/api/campaigns

Query parameters:

```
filter[status]
```
- Filter by status:
```
sent
```
,
```
draft
```
,
```
ready
```
```
filter[type]
```
- Filter by type:
```
regular
```
,
```
ab
```
,
```
resend
```
,
```
rss
```
```
limit
```
- Results per page: 10, 25, 50, or 100 (default: 25)
```
page
```
- Page number (starts from 1)

Get Campaign

GET /mailerlite/api/campaigns/{campaign_id}

Create Campaign

POST /mailerlite/api/campaigns
Content-Type: application/json
{
"name": "My Newsletter",
"type": "regular",
"emails": [
{
"subject": "Weekly Update",
"from_name": "Newsletter",
"from": "newsletter@example.com"
}
],
"groups": ["12345678901234567"]
}

Update Campaign

PUT /mailerlite/api/campaigns/{campaign_id}
Content-Type: application/json
{
"name": "Updated Campaign Name",
"emails": [
{
"subject": "New Subject Line",
"from_name": "Newsletter",
"from": "newsletter@example.com"
}
]
}

Note: Only draft campaigns can be updated.

Schedule Campaign

POST /mailerlite/api/campaigns/{campaign_id}/schedule
Content-Type: application/json
{
"delivery": "instant"
}

For scheduled delivery:

{
  "delivery": "scheduled",
  "schedule": {
    "date": "2026-03-15",
    "hours": "10",
    "minutes": "30"
  }
}

Cancel Campaign

POST /mailerlite/api/campaigns/{campaign_id}/cancel

Reverts a ready campaign to draft status.

Delete Campaign

DELETE /mailerlite/api/campaigns/{campaign_id}

Get Campaign Subscriber Activity

GET /mailerlite/api/campaigns/{campaign_id}/reports/subscriber-activity

Query parameters:

filter[type]

- Filter by activity:

opened

unopened

clicked

unsubscribed

forwarded

hardbounced

softbounced

junk

```
filter[search]
```
- Search by email
```
limit
```
- Results per page (10, 25, 50, or 100)
```
page
```
- Page number (starts from 1)

Automation Operations

List Automations

GET /mailerlite/api/automations

Query parameters:

```
filter[enabled]
```
- Filter by status:
```
true
```
or
```
false
```
```
filter[name]
```
- Filter by name
```
filter[group]
```
- Filter by group ID
```
page
```
- Page number (starts from 1)
```
limit
```
- Results per page (default: 10)

Get Automation

GET /mailerlite/api/automations/{automation_id}

Create Automation

POST /mailerlite/api/automations
Content-Type: application/json

{
"name": "Welcome Series"
}

Creates a draft automation.

Get Automation Activity

GET /mailerlite/api/automations/{automation_id}/activity

Query parameters:

filter[status]

- Required:

completed

active

canceled

failed

```
filter[date_from]
```
- Start date (Y-m-d)
```
filter[date_to]
```
- End date (Y-m-d)
```
filter[search]
```
- Search by email
```
page
```
- Page number (starts from 1)
```
limit
```
- Results per page (default: 10)

Delete Automation

DELETE /mailerlite/api/automations/{automation_id}

Field Operations

List Fields

GET /mailerlite/api/fields

Query parameters:

```
limit
```
- Results per page (max 100)
```
page
```
- Page number (starts from 1)
```
filter[keyword]
```
- Filter by keyword (partial match)
```
filter[type]
```
- Filter by type:
```
text
```
,
```
number
```
,
```
date
```
```
sort
```
- Sort by:
```
name
```
,
```
type
```
(prepend
```
-
```
for descending)

Create Field

POST /mailerlite/api/fields
Content-Type: application/json

{
"name": "Company",
"type": "text"
}

Update Field

PUT /mailerlite/api/fields/{field_id}
Content-Type: application/json
{
"name": "Organization"
}

Delete Field

DELETE /mailerlite/api/fields/{field_id}

Segment Operations

List Segments

GET /mailerlite/api/segments

Query parameters:

```
limit
```
- Results per page (max 250)
```
page
```
- Page number (starts from 1)

Get Segment Subscribers

GET /mailerlite/api/segments/{segment_id}/subscribers

Query parameters:

filter[status]

- Filter by status:

active

unsubscribed

unconfirmed

bounced

junk

```
limit
```
- Results per page
```
cursor
```
- Pagination cursor

Update Segment

PUT /mailerlite/api/segments/{segment_id}
Content-Type: application/json
{
"name": "High Engagement Subscribers"
}

Delete Segment

DELETE /mailerlite/api/segments/{segment_id}

Form Operations

List Forms

GET /mailerlite/api/forms/{type}

Path parameters:

```
type
```
- Form type:
```
popup
```
,
```
embedded
```
,
```
promotion
```

Query parameters:

```
limit
```
- Results per page
```
page
```
- Page number (starts from 1)
```
filter[name]
```
- Filter by name (partial match)

sort

- Sort by:

created_at

name

conversions_count

opens_count

visitors

conversion_rate

last_registration_at

(prepend

for descending)

Get Form

GET /mailerlite/api/forms/{form_id}

Update Form

PUT /mailerlite/api/forms/{form_id}
Content-Type: application/json
{
"name": "Newsletter Signup"
}

Delete Form

DELETE /mailerlite/api/forms/{form_id}

Get Form Subscribers

GET /mailerlite/api/forms/{form_id}/subscribers

Query parameters:

filter[status]

- Filter by status:

active

unsubscribed

unconfirmed

bounced

junk

```
limit
```
- Results per page (default: 25)
```
cursor
```
- Pagination cursor

Webhook Operations

List Webhooks

GET /mailerlite/api/webhooks

Get Webhook

GET /mailerlite/api/webhooks/{webhook_id}

Create Webhook

POST /mailerlite/api/webhooks
Content-Type: application/json

{
"name": "Subscriber Updates",
"events": ["subscriber.created", "subscriber.updated"],
"url": "https://example.com/webhook"
}

Update Webhook

PUT /mailerlite/api/webhooks/{webhook_id}
Content-Type: application/json
{
"name": "Updated Webhook",
"enabled": true
}

Delete Webhook

DELETE /mailerlite/api/webhooks/{webhook_id}

Pagination

MailerLite uses cursor-based pagination for most endpoints and page-based pagination for some.

Cursor-based Pagination

GET /mailerlite/api/subscribers?limit=25&cursor=eyJpZCI6MTIzNDU2fQ

Response includes pagination links:

{
  "data": [...],
  "links": {
    "first": "https://connect.mailerlite.com/api/subscribers?cursor=...",
    "last": null,
    "prev": null,
    "next": "https://connect.mailerlite.com/api/subscribers?cursor=eyJpZCI6MTIzNDU2fQ"
  },
  "meta": {
    "path": "https://connect.mailerlite.com/api/subscribers",
    "per_page": 25,
    "next_cursor": "eyJpZCI6MTIzNDU2fQ",
    "prev_cursor": null
  }
}

Page-based Pagination

GET /mailerlite/api/groups?limit=25&page=2

Response includes page metadata:

{
  "data": [...],
  "meta": {
    "current_page": 2,
    "from": 26,
    "last_page": 4,
    "per_page": 25,
    "to": 50,
    "total": 100
  }
}

Code Examples

JavaScript

const response = await fetch(
  'https://gateway.maton.ai/mailerlite/api/subscribers?limit=10',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
const data = await response.json();

Python

import os
import requests
response = requests.get(
'https://gateway.maton.ai/mailerlite/api/subscribers&#x27;,
headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'},
params={'limit': 10}
)
data = response.json()

Create Subscriber Example

import os
import requests
response = requests.post(
'https://gateway.maton.ai/mailerlite/api/subscribers&#x27;,
headers={
'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}',
'Content-Type': 'application/json'
},
json={
'email': 'newuser@example.com',
'fields': {'name': 'John Doe'},
'status': 'active'
}
)
data = response.json()

Notes

Rate limit: 120 requests per minute
Subscriber emails are used as unique identifiers (POST creates or updates)
Group names have a maximum length of 255 characters
Only draft campaigns can be updated
API versioning can be overridden via
```
X-Version: YYYY-MM-DD
```
header
IMPORTANT: When using curl commands, use
```
curl -g
```
when URLs contain brackets to disable glob parsing
IMPORTANT: When piping curl output to
```
jq
```
or other commands, environment variables like
```
$MATON_API_KEY
```
may not expand correctly in some shell environments

Error Handling

Status	Meaning
400	Missing MailerLite connection
401	Invalid or missing Maton API key
403	Forbidden - insufficient permissions
404	Resource not found
422	Validation error
429	Rate limited (120 req/min)
4xx/5xx	Passthrough error from MailerLite API

Troubleshooting: API Key Issues

Check that the
```
MATON_API_KEY
```
environment variable is set:

echo $MATON_API_KEY

Verify the API key is valid by listing connections:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://ctrl.maton.ai/connections')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Troubleshooting: Invalid App Name

Ensure your URL path starts with
```
mailerlite
```
. For example:

Correct:

https://gateway.maton.ai/mailerlite/api/subscribers

Incorrect:

https://gateway.maton.ai/api/subscribers

MailerLite

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Be Part of the 0+ Developer Community

MailerLite

Quick Start

Base URL

Authentication

Getting Your API Key

Connection Management

List Connections

Create Connection

Get Connection

Delete Connection

Specifying Connection

API Reference

Subscriber Operations

List Subscribers

Get Subscriber

Create/Upsert Subscriber

Update Subscriber

Delete Subscriber

Get Subscriber Activity

Forget Subscriber (GDPR)

Group Operations

List Groups

Create Group

Update Group

Delete Group

Get Group Subscribers

Assign Subscriber to Group

Remove Subscriber from Group

Campaign Operations

List Campaigns

Get Campaign

Create Campaign

Update Campaign

Schedule Campaign

Cancel Campaign

Delete Campaign

Get Campaign Subscriber Activity

Automation Operations

List Automations

Get Automation

Create Automation

Get Automation Activity

Delete Automation

Field Operations

List Fields

Create Field

Update Field

Delete Field

Segment Operations

List Segments

Get Segment Subscribers

Update Segment

Delete Segment

Form Operations

List Forms

Get Form

Update Form

Delete Form

Get Form Subscribers

Webhook Operations

List Webhooks

Get Webhook

Create Webhook

Update Webhook

Delete Webhook

Pagination

Cursor-based Pagination

Page-based Pagination

Code Examples

JavaScript

Python

Create Subscriber Example

Notes

Error Handling

Troubleshooting: API Key Issues

Troubleshooting: Invalid App Name

Resources