Constant Contact

Access the Constant Contact V3 API with managed OAuth authentication. Manage contacts, email campaigns, contact lists, tags, custom fields, segments, bulk operations, and marketing analytics.

Quick Start

# List contacts
python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/constant-contact/v3/contacts')
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://api.maton.ai/constant-contact/v3/{resource}

Maton proxies requests to api.cc.email/v3 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 Constant Contact OAuth connections at https://api.maton.ai.

List Connections

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/connections?app=constant-contact&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': 'constant-contact'}).encode()
req = urllib.request.Request('https://api.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://api.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": "{connection_id}",
    "status": "ACTIVE",
    "creation_time": "2026-02-07T07:41:05.859244Z",
    "last_updated_time": "2026-02-07T07:41:32.658230Z",
    "url": "https://connect.maton.ai/?session_token=...",
    "app": "constant-contact",
    "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://api.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 Constant Contact connections, specify which one to use with the Maton-Connection header:

python <<'EOF'
import urllib.request, os, json
req = urllib.request.Request('https://api.maton.ai/constant-contact/v3/contacts')
req.add_header('Authorization', f'Bearer {os.environ["MATON_API_KEY"]}')
req.add_header('Maton-Connection', '{connection_id}')
print(json.dumps(json.load(urllib.request.urlopen(req)), indent=2))
EOF

Always include the Maton-Connection header to ensure requests go to the intended account, especially before any write operation. If you have multiple connections and omit this header, the gateway uses the default connection, which may not be the intended account.

Security & Permissions

• Access is scoped to contacts, email campaigns, lists, segments, tags, custom fields, and marketing analytics within the connected Constant Contact account. Only install if you need Constant Contact administration. Revoke unused connections promptly.
• Default to read-only operations. Always start by listing or retrieving resources to confirm identifiers before proposing any changes.
• All write operations require explicit user approval with specific identifiers. Before executing any POST, PUT, PATCH, or DELETE call:
  1. Retrieve and display the target resource (contact email, list name, campaign name/ID) so the user can verify.
  2. Clearly describe the intended effect (e.g., "This will delete contact 'john@example.com' (ID: abc123) from your account").
  3. Wait for explicit user confirmation before proceeding.
• High-impact operations require extra caution. Sending/scheduling email campaigns, bulk contact deletions, bulk list membership changes, and importing contacts can affect large numbers of marketing contacts and external recipients. These actions must include a summary of consequences and require confirmation.
• Campaign sending is irreversible — emails are delivered to external recipients immediately. Always preview the campaign and confirm recipients, subject, and content before sending or scheduling.

API Reference

Account

Get Account Summary

GET /constant-contact/v3/account/summary

Response:

{
  "contact_email": "user@example.com",
  "contact_phone": "5551234567",
  "country_code": "us",
  "encoded_account_id": "abc123",
  "first_name": "John",
  "last_name": "Doe",
  "organization_name": "Acme Inc",
  "state_code": "CA",
  "time_zone_id": "US/Eastern"
}

Update Account Summary

PUT /constant-contact/v3/account/summary
Content-Type: application/json

{
  "first_name": "John",
  "last_name": "Doe",
  "organization_name": "Acme Inc",
  "time_zone_id": "US/Eastern"
}

Get Account Emails

Returns confirmed sender email addresses for the account.

GET /constant-contact/v3/account/emails

Response:

[
  {
    "email_id": 1,
    "email_address": "marketing@example.com",
    "roles": ["BILLING", "CONTACT", "DEFAULT_FROM", "REPLY_TO"],
    "confirm_status": "CONFIRMED",
    "confirm_time": "2026-02-05T07:32:49.766+0000",
    "confirm_source_type": "SITE_OWNER"
  }
]

Add Account Email

POST /constant-contact/v3/account/emails
Content-Type: application/json

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

A confirmation email will be sent to the address. The email must be confirmed before it can be used as a sender.

Get User Privileges

GET /constant-contact/v3/account/user/privileges

Contacts

List Contacts

GET /constant-contact/v3/contacts

Query parameters:

• status - Filter by status: all, active, deleted, not_set, pending_confirmation, temp_hold, unsubscribed
• email - Filter by exact email address
• lists - Filter by list ID(s), comma-separated
• segment_id - Filter by segment ID
• tags - Filter by tag ID(s), comma-separated
• updated_after - ISO-8601 date filter (e.g., 2026-04-01T00:00:00Z)
• include - Include subresources: custom_fields, list_memberships, taggings, notes (comma-separated)
• limit - Results per page (default 50, max 500)

Example with filters:

GET /constant-contact/v3/contacts?email=john@example.com&status=all
GET /constant-contact/v3/contacts?updated_after=2026-04-01T00:00:00Z&limit=100
GET /constant-contact/v3/contacts?include=custom_fields,list_memberships,taggings&limit=50

Get Contact

GET /constant-contact/v3/contacts/{contact_id}

Query parameters:

• include - Include subresources: custom_fields, list_memberships, taggings, notes (comma-separated)

Example:

GET /constant-contact/v3/contacts/{contact_id}?include=custom_fields,list_memberships,taggings,notes

Response:

{
  "contact_id": "uuid",
  "email_address": {
    "address": "john@example.com",
    "permission_to_send": "implicit",
    "created_at": "2026-04-28T21:46:22Z",
    "updated_at": "2026-04-28T21:46:22Z",
    "opt_in_source": "Account",
    "opt_in_date": "2026-04-28T21:46:22Z",
    "confirm_status": "off"
  },
  "first_name": "John",
  "last_name": "Doe",
  "create_source": "Account",
  "created_at": "2026-04-28T21:46:22Z",
  "updated_at": "2026-04-28T21:46:22Z",
  "custom_fields": [],
  "list_memberships": ["list-uuid"],
  "taggings": [],
  "notes": []
}

Create Contact

IMPORTANT: The create_source field is required.

POST /constant-contact/v3/contacts
Content-Type: application/json

{
  "email_address": {
    "address": "john@example.com",
    "permission_to_send": "implicit"
  },
  "first_name": "John",
  "last_name": "Doe",
  "job_title": "Developer",
  "company_name": "Acme Inc",
  "create_source": "Account",
  "list_memberships": ["list-uuid-here"]
}

Valid create_source values: Account, Contact, Landing Page

Update Contact

IMPORTANT: The update_source field is required.

PUT /constant-contact/v3/contacts/{contact_id}
Content-Type: application/json

{
  "email_address": {
    "address": "john@example.com"
  },
  "first_name": "John",
  "last_name": "Smith",
  "update_source": "Account"
}

Valid update_source values: Account, Contact, Landing Page

Delete Contact

DELETE /constant-contact/v3/contacts/{contact_id}

Returns 204 No Content on success.

Create or Update Contact (Sign-Up Form)

Use this endpoint to create a new contact or update an existing one by email address without checking if they exist first:

POST /constant-contact/v3/contacts/sign_up_form
Content-Type: application/json

{
  "email_address": "john@example.com",
  "first_name": "John",
  "last_name": "Doe",
  "list_memberships": ["list-uuid-here"]
}

Response:

{
  "contact_id": "uuid",
  "action": "created"
}

The action field indicates whether the contact was created or updated.

Get Contact Counts

GET /constant-contact/v3/contacts/counts

Response:

{
  "total": 150,
  "explicit": 100,
  "implicit": 40,
  "pending": 5,
  "unsubscribed": 5
}

Contact Lists

List Contact Lists

GET /constant-contact/v3/contact_lists

Query parameters:

• include_count - Include total list count (true/false)
• include_membership_count - Include contact count per list: all, active, unsubscribed
• limit - Results per page

Example:

GET /constant-contact/v3/contact_lists?include_membership_count=all

Response:

{
  "lists": [
    {
      "list_id": "uuid",
      "name": "Newsletter Subscribers",
      "description": "Main newsletter",
      "favorite": false,
      "created_at": "2026-02-05T07:19:59Z",
      "updated_at": "2026-02-05T07:19:59Z",
      "membership_count": 150
    }
  ],
  "lists_count": 1
}

Get Contact List

GET /constant-contact/v3/contact_lists/{list_id}

Query parameters:

• include_membership_count - Include membership count: all, active, unsubscribed

Create Contact List

POST /constant-contact/v3/contact_lists
Content-Type: application/json

{
  "name": "Newsletter Subscribers",
  "description": "Main newsletter list",
  "favorite": false
}

Update Contact List

PUT /constant-contact/v3/contact_lists/{list_id}
Content-Type: application/json

{
  "name": "Updated List Name",
  "description": "Updated description",
  "favorite": true
}

Delete Contact List

DELETE /constant-contact/v3/contact_lists/{list_id}

Returns 202 Accepted (deletion is asynchronous).

Tags

List Tags

GET /constant-contact/v3/contact_tags

Query parameters:

• limit - Results per page

Create Tag

POST /constant-contact/v3/contact_tags
Content-Type: application/json

{
  "name": "VIP Customer"
}

Update Tag

PUT /constant-contact/v3/contact_tags/{tag_id}
Content-Type: application/json

{
  "name": "Premium Customer"
}

Delete Tag

DELETE /constant-contact/v3/contact_tags/{tag_id}

Returns 202 Accepted (deletion is asynchronous).

Custom Fields

List Custom Fields

GET /constant-contact/v3/contact_custom_fields

Create Custom Field

POST /constant-contact/v3/contact_custom_fields
Content-Type: application/json

{
  "label": "Customer ID",
  "type": "string"
}

Valid types: string, date

Response:

{
  "custom_field_id": "uuid",
  "label": "Customer ID",
  "name": "customer_id",
  "type": "string",
  "version": 1,
  "created_at": "2026-04-28T21:45:57Z",
  "updated_at": "2026-04-28T21:45:57Z"
}

Delete Custom Field

DELETE /constant-contact/v3/contact_custom_fields/{custom_field_id}

Email Campaigns

List Email Campaigns

GET /constant-contact/v3/emails

Query parameters:

• limit - Results per page (default 50)
• before_date - ISO-8601 date filter
• after_date - ISO-8601 date filter

Response:

{
  "campaigns": [
    {
      "campaign_id": "uuid",
      "name": "March Newsletter",
      "current_status": "Draft",
      "type": "CUSTOM_CODE_EMAIL",
      "type_code": 26,
      "created_at": "2026-04-28T21:47:35.000Z",
      "updated_at": "2026-04-28T21:47:35.000Z"
    }
  ]
}

Get Email Campaign

GET /constant-contact/v3/emails/{campaign_id}

Response includes campaign activity IDs:

{
  "campaign_activities": [
    {
      "campaign_activity_id": "uuid",
      "role": "primary_email"
    },
    {
      "campaign_activity_id": "uuid",
      "role": "permalink"
    }
  ],
  "campaign_id": "uuid",
  "current_status": "DRAFT",
  "name": "March Newsletter",
  "type": "CUSTOM_CODE_EMAIL"
}

Create Email Campaign

POST /constant-contact/v3/emails
Content-Type: application/json

{
  "name": "March Newsletter",
  "email_campaign_activities": [
    {
      "format_type": 5,
      "from_name": "Company Name",
      "from_email": "marketing@example.com",
      "reply_to_email": "reply@example.com",
      "subject": "March Newsletter",
      "html_content": "<html><body><h1>Hello!</h1></body></html>"
    }
  ]
}

The from_email must be a confirmed account email address (see Account Emails).

Rename Email Campaign

PATCH /constant-contact/v3/emails/{campaign_id}
Content-Type: application/json

{
  "name": "New Campaign Name"
}

Delete Email Campaign

DELETE /constant-contact/v3/emails/{campaign_id}

Returns 204 No Content on success.

Email Campaign Activities

Campaign activities are the content/configuration of a campaign. Use the campaign_activity_id with role primary_email from the campaign response.

Get Campaign Activity

GET /constant-contact/v3/emails/activities/{campaign_activity_id}

Response:

{
  "campaign_activity_id": "uuid",
  "campaign_id": "uuid",
  "role": "primary_email",
  "contact_list_ids": [],
  "segment_ids": [],
  "current_status": "DRAFT",
  "format_type": 5,
  "from_email": "marketing@example.com",
  "from_name": "Company",
  "reply_to_email": "reply@example.com",
  "subject": "Newsletter"
}

Update Campaign Activity

Updates the email content, targeting, and sender information. All fields in the request body are replaced.

PUT /constant-contact/v3/emails/activities/{campaign_activity_id}
Content-Type: application/json

{
  "from_name": "Updated Name",
  "from_email": "marketing@example.com",
  "reply_to_email": "reply@example.com",
  "subject": "Updated Subject",
  "html_content": "<html><body><h1>Updated Content</h1></body></html>",
  "contact_list_ids": ["list-uuid-here"]
}

IMPORTANT: from_email is required in the update body. Omitting it returns a validation error.

Preview Campaign Activity

Returns the rendered HTML and text preview of the email.

GET /constant-contact/v3/emails/activities/{campaign_activity_id}/previews

Response:

{
  "campaign_activity_id": "uuid",
  "from_email": "marketing@example.com",
  "from_name": "Company",
  "preview_html_content": "<html>...</html>",
  "preview_text_content": "Plain text version...",
  "reply_to_email": "reply@example.com",
  "subject": "Newsletter"
}

Send Test Email

Sends a test/proof version of the email to specified addresses.

POST /constant-contact/v3/emails/activities/{campaign_activity_id}/tests
Content-Type: application/json

{
  "email_addresses": ["test@example.com"],
  "personal_message": "Please review this draft"
}

Returns 204 No Content on success.

Schedule Email Campaign

POST /constant-contact/v3/emails/activities/{campaign_activity_id}/schedules
Content-Type: application/json

{
  "scheduled_date": "2026-06-01T10:00:00Z"
}

Note: The campaign activity must have a valid from_email, a physical address on the account, and at least one target list or segment before scheduling.

Get Campaign Schedule

GET /constant-contact/v3/emails/activities/{campaign_activity_id}/schedules

Unschedule Email Campaign

DELETE /constant-contact/v3/emails/activities/{campaign_activity_id}/schedules

Get Non-Opener Resend

GET /constant-contact/v3/emails/activities/{campaign_activity_id}/non_opener_resends

Returns resend details for sent campaigns. Returns empty array if no resend is configured.

Get A/B Test

GET /constant-contact/v3/emails/activities/{campaign_activity_id}/abtest

Segments

List Segments

GET /constant-contact/v3/segments

Query parameters:

• sort_by - Sort field (e.g., name, date)
• sort_order - asc or desc

Get Segment

GET /constant-contact/v3/segments/{segment_id}

Create Segment

Segments use a criteria object to define the audience filter:

POST /constant-contact/v3/segments
Content-Type: application/json

{
  "name": "Engaged Subscribers",
  "segment_criteria": {
    "version": "3.0.0",
    "criteria": { ... }
  }
}

Note: The segment_criteria must be a JSON object (not a string). The criteria schema is complex and version-dependent. Refer to the Constant Contact Segments Documentation for the full criteria format.

Update Segment

PUT /constant-contact/v3/segments/{segment_id}
Content-Type: application/json

{
  "name": "Updated Segment Name",
  "segment_criteria": { ... }
}

Delete Segment

DELETE /constant-contact/v3/segments/{segment_id}

Bulk Activities

Bulk activities run asynchronously. After creating a bulk activity, poll the activity status endpoint until completion.

List Activities

GET /constant-contact/v3/activities

Query parameters:

• limit - Results per page
• state - Filter by state: processing, completed, cancelled, failed, timed_out

Get Activity Status

GET /constant-contact/v3/activities/{activity_id}

Response:

{
  "activity_id": "uuid",
  "state": "completed",
  "started_at": "2026-04-28T21:48:16Z",
  "completed_at": "2026-04-28T21:48:16Z",
  "created_at": "2026-04-28T21:48:15Z",
  "updated_at": "2026-04-28T21:48:16Z",
  "percent_done": 100,
  "activity_errors": [],
  "status": {
    "items_total_count": 1,
    "items_completed_count": 1
  }
}

Add Contacts to Lists

POST /constant-contact/v3/activities/add_list_memberships
Content-Type: application/json

{
  "source": {
    "contact_ids": ["contact-uuid-1", "contact-uuid-2"]
  },
  "list_ids": ["list-uuid"]
}

The source can also use list_ids to copy contacts from other lists:

{
  "source": {
    "list_ids": ["source-list-uuid"]
  },
  "list_ids": ["target-list-uuid"]
}

Remove Contacts from Lists

POST /constant-contact/v3/activities/remove_list_memberships
Content-Type: application/json

{
  "source": {
    "contact_ids": ["contact-uuid-1", "contact-uuid-2"]
  },
  "list_ids": ["target-list-uuid"]
}

Add Tags to Contacts

POST /constant-contact/v3/activities/contacts_taggings_add
Content-Type: application/json

{
  "source": {
    "contact_ids": ["contact-uuid-1", "contact-uuid-2"]
  },
  "tag_ids": ["tag-uuid"]
}

Remove Tags from Contacts

POST /constant-contact/v3/activities/contacts_taggings_remove
Content-Type: application/json

{
  "source": {
    "contact_ids": ["contact-uuid-1", "contact-uuid-2"]
  },
  "tag_ids": ["tag-uuid"]
}

Export Contacts

POST /constant-contact/v3/activities/contact_exports
Content-Type: application/json

{
  "contact_ids": ["contact-uuid-1", "contact-uuid-2"],
  "fields": ["first_name", "last_name", "email"]
}

The response includes a results link to download the export:

{
  "activity_id": "uuid",
  "state": "initialized",
  "_links": {
    "self": { "href": "/v3/activities/{activity_id}" },
    "results": { "href": "/v3/contact_exports/{export_id}" }
  }
}

Download Contact Export

After the export activity completes, download the CSV:

GET /constant-contact/v3/contact_exports/{export_id}

Returns CSV data.

Import Contacts

POST /constant-contact/v3/activities/contacts_file_import
Content-Type: multipart/form-data

{file: contacts.csv, list_ids: ["list-uuid"]}

Delete Contacts in Bulk

POST /constant-contact/v3/activities/contact_delete
Content-Type: application/json

{
  "contact_ids": ["contact-uuid-1", "contact-uuid-2"]
}

Reporting

Email Campaign Summaries

GET /constant-contact/v3/reports/summary_reports/email_campaign_summaries

Response:

{
  "bulk_email_campaign_summaries": [...],
  "aggregate_percents": {
    "click": 5.2,
    "open": 22.1,
    "did_not_open": 72.7,
    "bounce": 1.3,
    "unsubscribe": 0.2
  }
}

Get Email Campaign Report

Returns detailed metrics for a specific sent campaign activity.

GET /constant-contact/v3/reports/email_reports/{campaign_activity_id}

Note: Only available for sent campaigns. Draft campaigns return 404.

Contact Activity Summary

GET /constant-contact/v3/reports/contact_reports/{contact_id}/activity_summary

Response:

{
  "contact_id": "uuid",
  "campaign_activities": [
    {
      "campaign_activity_id": "uuid",
      "sends": 1,
      "opens": 1,
      "clicks": 0,
      "bounces": 0
    }
  ]
}

Pagination

The API uses cursor-based pagination with a limit parameter:

GET /constant-contact/v3/contacts?limit=50

Response includes pagination links:

{
  "contacts": [...],
  "_links": {
    "next": {
      "href": "/v3/contacts?cursor=abc123"
    }
  }
}

Use the cursor from the next link for subsequent pages:

GET /constant-contact/v3/contacts?cursor=abc123

When there are no more pages, the _links.next field is absent from the response.

Code Examples

JavaScript

const response = await fetch(
  'https://api.maton.ai/constant-contact/v3/contacts?limit=50',
  {
    headers: {
      'Authorization': `Bearer ${process.env.MATON_API_KEY}`
    }
  }
);
const data = await response.json();

Python

import os
import requests

response = requests.get(
    'https://api.maton.ai/constant-contact/v3/contacts',
    headers={'Authorization': f'Bearer {os.environ["MATON_API_KEY"]}'},
    params={'limit': 50}
)
data = response.json()

Notes

• Resource IDs use UUID format (36 characters with hyphens)
• All dates use ISO-8601 format: YYYY-MM-DDThh:mm:ss.sZ
• Maximum 1,000 contact lists per account
• A contact can belong to up to 50 lists
• Bulk operations are asynchronous - check activity status for completion
• Email campaigns require confirmed sender email addresses
• format_type: 5 for custom HTML emails
• create_source is required when creating contacts; update_source is required when updating
• Scheduling a campaign requires a valid physical address on the account and at least one target list
• Delete operations on tags and lists return 202 Accepted (asynchronous); contacts and campaigns return 204 No Content
• 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 Constant Contact connection or invalid request
401	Invalid or missing Maton API key, or OAuth token expired
403	Insufficient permissions for the requested operation
404	Resource not found
409	Conflict (e.g., duplicate email address)
429	Rate limited
4xx/5xx	Passthrough error from Constant Contact API

Error Response Format

[
  {
    "error_key": "contacts.api.validation.error",
    "error_message": "create_source is missing, create_source does not have a valid value"
  }
]

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://api.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 constant-contact. For example:

• Correct: https://api.maton.ai/constant-contact/v3/contacts
• Incorrect: https://api.maton.ai/v3/contacts

Resources

• Constant Contact V3 API Overview
• API Reference
• Technical Overview
• Contacts Overview
• Email Campaigns Guide
• Contact Lists Overview
• Maton Community
• Maton Support