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

1. Sign in or create an account at maton.ai
2. Go to maton.ai/settings
3. 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',
    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',
    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

1. Check that the MATON_API_KEY environment variable is set:

echo $MATON_API_KEY

2. 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

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

• Correct: https://gateway.maton.ai/mailerlite/api/subscribers
• Incorrect: https://gateway.maton.ai/api/subscribers

Resources

• MailerLite API Documentation
• MailerLite Subscribers API
• MailerLite Groups API
• MailerLite Campaigns API
• Maton Community
• Maton Support