Mailchimp

Access the Mailchimp Marketing API with managed OAuth authentication. Manage audiences, campaigns, templates, automations, reports, and subscribers for email marketing.

Quick Start

bash
# List all audiences
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/lists')
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/mailchimp/{native-api-path}

Replace {native-api-path} with the actual Mailchimp API endpoint path (e.g., 3.0/lists). The gateway proxies requests to your Mailchimp data center 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 Mailchimp 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=mailchimp&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': 'mailchimp'}).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": "mailchimp",
    "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 Mailchimp 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/mailchimp/3.0/lists')
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

Lists (Audiences)

Within the Mailchimp app, "audience" is the common term, but the API uses "lists" for endpoints.

Get All Lists

bash
GET /mailchimp/3.0/lists

Query parameters:

• count - Number of records to return (default 10, max 1000)
• offset - Number of records to skip (for pagination)
• fields - Comma-separated list of fields to include
• exclude_fields - Comma-separated list of fields to exclude

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/lists?count=10')
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
{
  "lists": [
    {
      "id": "abc123def4",
      "name": "Newsletter Subscribers",
      "contact": {
        "company": "Acme Corp",
        "address1": "123 Main St"
      },
      "stats": {
        "member_count": 5000,
        "unsubscribe_count": 100,
        "open_rate": 0.25
      }
    }
  ],
  "total_items": 1
}

Get a List

bash
GET /mailchimp/3.0/lists/{list_id}

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/lists/abc123def4')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create a List

bash
POST /mailchimp/3.0/lists
Content-Type: application/json

{
  "name": "Newsletter",
  "contact": {
    "company": "Acme Corp",
    "address1": "123 Main St",
    "city": "New York",
    "state": "NY",
    "zip": "10001",
    "country": "US"
  },
  "permission_reminder": "You signed up for our newsletter",
  "campaign_defaults": {
    "from_name": "Acme Corp",
    "from_email": "newsletter@acme.com",
    "subject": "",
    "language": "en"
  },
  "email_type_option": true
}

Update a List

bash
PATCH /mailchimp/3.0/lists/{list_id}

Delete a List

bash
DELETE /mailchimp/3.0/lists/{list_id}

List Members (Subscribers)

Members are contacts within an audience. The API uses MD5 hash of the lowercase email address as the subscriber identifier.

Get List Members

bash
GET /mailchimp/3.0/lists/{list_id}/members

Query parameters:

• status - Filter by subscription status (subscribed, unsubscribed, cleaned, pending, transactional)
• count - Number of records to return
• offset - Number of records to skip

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/lists/abc123def4/members?status=subscribed&count=50')
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
{
  "members": [
    {
      "id": "f4b7c8d9e0",
      "email_address": "john@example.com",
      "status": "subscribed",
      "merge_fields": {
        "FNAME": "John",
        "LNAME": "Doe"
      },
      "tags": [
        {"id": 1, "name": "VIP"}
      ]
    }
  ],
  "total_items": 500
}

Get a Member

bash
GET /mailchimp/3.0/lists/{list_id}/members/{subscriber_hash}

The subscriber_hash is the MD5 hash of the lowercase email address.

Example:

bash
# For email "john@example.com", subscriber_hash = md5("john@example.com")
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/lists/abc123def4/members/b4c9a0d1e2f3g4h5')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Add a Member

bash
POST /mailchimp/3.0/lists/{list_id}/members
Content-Type: application/json

{
  "email_address": "newuser@example.com",
  "status": "subscribed",
  "merge_fields": {
    "FNAME": "Jane",
    "LNAME": "Smith"
  },
  "tags": ["Newsletter", "Premium"]
}

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({'email_address': 'newuser@example.com', 'status': 'subscribed', 'merge_fields': {'FNAME': 'Jane', 'LNAME': 'Smith'}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/lists/abc123def4/members', 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

Update a Member

bash
PATCH /mailchimp/3.0/lists/{list_id}/members/{subscriber_hash}

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({'merge_fields': {'FNAME': 'Jane', 'LNAME': 'Doe'}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/lists/abc123def4/members/b4c9a0d1e2f3g4h5', data=data, method='PATCH')
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

Add or Update a Member (Upsert)

bash
PUT /mailchimp/3.0/lists/{list_id}/members/{subscriber_hash}
Content-Type: application/json

{
  "email_address": "user@example.com",
  "status_if_new": "subscribed",
  "merge_fields": {
    "FNAME": "Jane",
    "LNAME": "Smith"
  }
}

Creates a new member or updates an existing one based on the email hash. Use status_if_new to set the status when creating a new member.

Delete a Member

Archives a member (can be re-added later):

bash
DELETE /mailchimp/3.0/lists/{list_id}/members/{subscriber_hash}

Returns 204 No Content on success.

To permanently delete (GDPR compliant):

bash
POST /mailchimp/3.0/lists/{list_id}/members/{subscriber_hash}/actions/delete-permanent

Member Tags

Get Member Tags

bash
GET /mailchimp/3.0/lists/{list_id}/members/{subscriber_hash}/tags

Add or Remove Tags

bash
POST /mailchimp/3.0/lists/{list_id}/members/{subscriber_hash}/tags
Content-Type: application/json

{
  "tags": [
    {"name": "VIP", "status": "active"},
    {"name": "Old Tag", "status": "inactive"}
  ]
}

Returns 204 No Content on success.

Segments

Get Segments

bash
GET /mailchimp/3.0/lists/{list_id}/segments

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/lists/abc123def4/segments')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Create a Segment

bash
POST /mailchimp/3.0/lists/{list_id}/segments
Content-Type: application/json

{
  "name": "Active Subscribers",
  "options": {
    "match": "all",
    "conditions": [
      {
        "condition_type": "EmailActivity",
        "field": "opened",
        "op": "date_within",
        "value": "30"
      }
    ]
  }
}

Update a Segment

bash
PATCH /mailchimp/3.0/lists/{list_id}/segments/{segment_id}

Get Segment Members

bash
GET /mailchimp/3.0/lists/{list_id}/segments/{segment_id}/members

Delete a Segment

bash
DELETE /mailchimp/3.0/lists/{list_id}/segments/{segment_id}

Returns 204 No Content on success.

Campaigns

Get All Campaigns

bash
GET /mailchimp/3.0/campaigns

Query parameters:

• type - Campaign type (regular, plaintext, absplit, rss, variate)
• status - Campaign status (save, paused, schedule, sending, sent)
• list_id - Filter by list ID
• count - Number of records to return
• offset - Number of records to skip

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/campaigns?status=sent&count=20')
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
{
  "campaigns": [
    {
      "id": "campaign123",
      "type": "regular",
      "status": "sent",
      "settings": {
        "subject_line": "Monthly Newsletter",
        "from_name": "Acme Corp"
      },
      "send_time": "2025-02-01T10:00:00Z",
      "report_summary": {
        "opens": 1500,
        "clicks": 300,
        "open_rate": 0.30,
        "click_rate": 0.06
      }
    }
  ],
  "total_items": 50
}

Get a Campaign

bash
GET /mailchimp/3.0/campaigns/{campaign_id}

Create a Campaign

bash
POST /mailchimp/3.0/campaigns
Content-Type: application/json

{
  "type": "regular",
  "recipients": {
    "list_id": "abc123def4"
  },
  "settings": {
    "subject_line": "Your Monthly Update",
    "from_name": "Acme Corp",
    "reply_to": "hello@acme.com"
  }
}

Example:

bash
python <<'EOF'
import urllib.request, os, json
data = json.dumps({'type': 'regular', 'recipients': {'list_id': 'abc123def4'}, 'settings': {'subject_line': 'February Newsletter', 'from_name': 'Acme Corp', 'reply_to': 'newsletter@acme.com'}}).encode()
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/campaigns', 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

Update a Campaign

bash
PATCH /mailchimp/3.0/campaigns/{campaign_id}

Delete a Campaign

bash
DELETE /mailchimp/3.0/campaigns/{campaign_id}

Returns 204 No Content on success.

Get Campaign Content

bash
GET /mailchimp/3.0/campaigns/{campaign_id}/content

Set Campaign Content

bash
PUT /mailchimp/3.0/campaigns/{campaign_id}/content
Content-Type: application/json

{
  "html": "<html><body><h1>Hello!</h1><p>Newsletter content here.</p></body></html>",
  "plain_text": "Hello! Newsletter content here."
}

Or use a template:

bash
PUT /mailchimp/3.0/campaigns/{campaign_id}/content
Content-Type: application/json

{
  "template": {
    "id": 12345,
    "sections": {
      "body": "<p>Custom content for the template section</p>"
    }
  }
}

Get Campaign Send Checklist

Check if a campaign is ready to send:

bash
GET /mailchimp/3.0/campaigns/{campaign_id}/send-checklist

Send a Campaign

bash
POST /mailchimp/3.0/campaigns/{campaign_id}/actions/send

Schedule a Campaign

bash
POST /mailchimp/3.0/campaigns/{campaign_id}/actions/schedule
Content-Type: application/json

{
  "schedule_time": "2025-03-01T10:00:00+00:00"
}

Cancel a Scheduled Campaign

bash
POST /mailchimp/3.0/campaigns/{campaign_id}/actions/cancel-send

Templates

Get All Templates

bash
GET /mailchimp/3.0/templates

Query parameters:

• type - Template type (user, base, gallery)
• count - Number of records to return
• offset - Number of records to skip

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/templates?type=user')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get a Template

bash
GET /mailchimp/3.0/templates/{template_id}

Get Template Default Content

bash
GET /mailchimp/3.0/templates/{template_id}/default-content

Create a Template

bash
POST /mailchimp/3.0/templates
Content-Type: application/json

{
  "name": "Newsletter Template",
  "html": "<html><body mc:edit=\"body\"><h1>Title</h1><p>Content here</p></body></html>"
}

Update a Template

bash
PATCH /mailchimp/3.0/templates/{template_id}

Delete a Template

bash
DELETE /mailchimp/3.0/templates/{template_id}

Returns 204 No Content on success.

Automations

Mailchimp's classic automations let you build email series triggered by dates, activities, or events.

Get All Automations

bash
GET /mailchimp/3.0/automations

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/automations')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Get an Automation

bash
GET /mailchimp/3.0/automations/{workflow_id}

Start an Automation

bash
POST /mailchimp/3.0/automations/{workflow_id}/actions/start-all-emails

Pause an Automation

bash
POST /mailchimp/3.0/automations/{workflow_id}/actions/pause-all-emails

Get Automation Emails

bash
GET /mailchimp/3.0/automations/{workflow_id}/emails

Add Subscriber to Automation Queue

Manually add a subscriber to an automation workflow:

bash
POST /mailchimp/3.0/automations/{workflow_id}/emails/{workflow_email_id}/queue
Content-Type: application/json

{
  "email_address": "subscriber@example.com"
}

Reports

Get Campaign Reports

bash
GET /mailchimp/3.0/reports

Query parameters:

• count - Number of records to return
• offset - Number of records to skip
• type - Campaign type

Example:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/reports?count=20')
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
{
  "reports": [
    {
      "id": "campaign123",
      "campaign_title": "Monthly Newsletter",
      "emails_sent": 5000,
      "opens": {
        "opens_total": 1500,
        "unique_opens": 1200,
        "open_rate": 0.24
      },
      "clicks": {
        "clicks_total": 450,
        "unique_clicks": 300,
        "click_rate": 0.06
      },
      "unsubscribed": 10,
      "bounce_rate": 0.02
    }
  ]
}

Get Campaign Report

bash
GET /mailchimp/3.0/reports/{campaign_id}

Get Campaign Open Details

bash
GET /mailchimp/3.0/reports/{campaign_id}/open-details

Get Campaign Click Details

bash
GET /mailchimp/3.0/reports/{campaign_id}/click-details

Get List Activity

bash
GET /mailchimp/3.0/lists/{list_id}/activity

Returns recent daily aggregated activity stats (unsubscribes, signups, opens, clicks) for up to 180 days.

Batch Operations

Process multiple operations in a single call.

Create Batch Operation

bash
POST /mailchimp/3.0/batches
Content-Type: application/json

{
  "operations": [
    {
      "method": "POST",
      "path": "/lists/abc123def4/members",
      "body": "{\"email_address\":\"user1@example.com\",\"status\":\"subscribed\"}"
    },
    {
      "method": "POST",
      "path": "/lists/abc123def4/members",
      "body": "{\"email_address\":\"user2@example.com\",\"status\":\"subscribed\"}"
    }
  ]
}

Get Batch Status

bash
GET /mailchimp/3.0/batches/{batch_id}

List All Batches

bash
GET /mailchimp/3.0/batches

Delete a Batch

bash
DELETE /mailchimp/3.0/batches/{batch_id}

Returns 204 No Content on success.

Pagination

Mailchimp uses offset-based pagination:

bash
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://gateway.maton.ai/mailchimp/3.0/lists?count=50&offset=100')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Response includes total_items for calculating total pages:

json
{
  "lists": [...],
  "total_items": 250
}

Code Examples

JavaScript

javascript
const response = await fetch(
  'https://gateway.maton.ai/mailchimp/3.0/lists',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
const data = await response.json();

Python

python
import os
import requests
import hashlib

# Get lists
response = requests.get(
    'https://gateway.maton.ai/mailchimp/3.0/lists',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'}
)
data = response.json()

# Add a subscriber
list_id = 'abc123def4'
email = 'newuser@example.com'

response = requests.post(
    f'https://gateway.maton.ai/mailchimp/3.0/lists/{list_id}/members',
    headers={
        'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}',
        'Content-Type': 'application/json'
    },
    json={
        'email_address': email,
        'status': 'subscribed'
    }
)

# Get subscriber hash for updates
subscriber_hash = hashlib.md5(email.lower().encode()).hexdigest()

Notes

• List IDs are 10-character alphanumeric strings
• Subscriber hashes are MD5 hashes of lowercase email addresses
• Timestamps are in ISO 8601 format
• The API has a 120-second timeout on calls
• Maximum 1000 records per request for list endpoints
• "Audience" and "list" are used interchangeably (app vs API terminology)
• "Contact" and "member" are used interchangeably (app vs API terminology)
• IMPORTANT: When using curl commands, use curl -g when URLs contain brackets (fields[], sort[], records[]) 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. You may get "Invalid API key" errors when piping.

Response Codes

| Status | Meaning | |--------|---------| | 200 | Success with response body | | 204 | Success with no content (DELETE, some POST operations) | | 400 | Bad request or missing Mailchimp connection | | 401 | Invalid or missing Maton API key | | 403 | Forbidden - insufficient permissions | | 404 | Resource not found | | 405 | Method not allowed | | 429 | Rate limited | | 4xx/5xx | Passthrough error from Mailchimp API |

Mailchimp error responses include detailed information:

json
{
  "type": "https://mailchimp.com/developer/marketing/docs/errors/",
  "title": "Invalid Resource",
  "status": 400,
  "detail": "The resource submitted could not be validated.",
  "instance": "abc123-def456",
  "errors": [
    {
      "field": "email_address",
      "message": "This value should be a valid email."
    }
  ]
}

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 mailchimp. For example:

• Correct: https://gateway.maton.ai/mailchimp/3.0/lists
• Incorrect: https://gateway.maton.ai/3.0/lists

Resources

• Mailchimp Marketing API Documentation
• API Reference
• Quick Start Guide
• Release Notes
• Maton Community
• Maton Support