MailerLite

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

Quick Start

bash
# 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:

bash
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

bash
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

bash
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

bash
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:

json
{
  "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

bash
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:

bash
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

bash
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

bash
GET /mailerlite/api/subscribers/{subscriber_id_or_email}

Create/Upsert Subscriber

bash
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

bash
PUT /mailerlite/api/subscribers/{subscriber_id}
Content-Type: application/json

{
  "fields": {
    "name": "Jane Doe"
  },
  "status": "active"
}

Delete Subscriber

bash
DELETE /mailerlite/api/subscribers/{subscriber_id}

Get Subscriber Activity

bash
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)

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

Group Operations

List Groups

bash
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

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

{
  "name": "Newsletter Subscribers"
}

Update Group

bash
PUT /mailerlite/api/groups/{group_id}
Content-Type: application/json

{
  "name": "Updated Group Name"
}

Delete Group

bash
DELETE /mailerlite/api/groups/{group_id}

Get Group Subscribers

bash
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

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

Remove Subscriber from Group

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

Campaign Operations

List Campaigns

bash
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

bash
GET /mailerlite/api/campaigns/{campaign_id}

Create Campaign

bash
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

bash
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

bash
POST /mailerlite/api/campaigns/{campaign_id}/schedule
Content-Type: application/json

{
  "delivery": "instant"
}

For scheduled delivery:

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

Cancel Campaign

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

Reverts a ready campaign to draft status.

Delete Campaign

bash
DELETE /mailerlite/api/campaigns/{campaign_id}

Get Campaign Subscriber Activity

bash
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

bash
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

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

Create Automation

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

{
  "name": "Welcome Series"
}

Creates a draft automation.

Get Automation Activity

bash
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

bash
DELETE /mailerlite/api/automations/{automation_id}

Field Operations

List Fields

bash
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

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

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

Update Field

bash
PUT /mailerlite/api/fields/{field_id}
Content-Type: application/json

{
  "name": "Organization"
}

Delete Field

bash
DELETE /mailerlite/api/fields/{field_id}

Segment Operations

List Segments

bash
GET /mailerlite/api/segments

Query parameters:

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

Get Segment Subscribers

bash
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

bash
PUT /mailerlite/api/segments/{segment_id}
Content-Type: application/json

{
  "name": "High Engagement Subscribers"
}

Delete Segment

bash
DELETE /mailerlite/api/segments/{segment_id}

Form Operations

List Forms

bash
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

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

Update Form

bash
PUT /mailerlite/api/forms/{form_id}
Content-Type: application/json

{
  "name": "Newsletter Signup"
}

Delete Form

bash
DELETE /mailerlite/api/forms/{form_id}

Get Form Subscribers

bash
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

bash
GET /mailerlite/api/webhooks

Get Webhook

bash
GET /mailerlite/api/webhooks/{webhook_id}

Create Webhook

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

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

Update Webhook

bash
PUT /mailerlite/api/webhooks/{webhook_id}
Content-Type: application/json

{
  "name": "Updated Webhook",
  "enabled": true
}

Delete Webhook

bash
DELETE /mailerlite/api/webhooks/{webhook_id}

Pagination

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

Cursor-based Pagination

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

Response includes pagination links:

json
{
  "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

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

Response includes page metadata:

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

Code Examples

JavaScript

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

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

python
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:

bash
echo $MATON_API_KEY

1. Verify the API key is valid by listing connections:

bash
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