This MCP server gives AI direct access to your entire Constant Contact email marketing workspace. Instead of clicking through interfaces, you just tell it what you need.

Constant Contact is the trusted email marketing platform for 600,000+ small businesses, non-profits, and creators. This MCP server brings its contact management and campaign tools into your AI workflow.

🎯 Email Marketing Power Moves

Stop context-switching between Claude and Constant Contact. The AI can directly control your campaigns:

Event-driven campaigns — "Create a 'Last Chance Webinar' campaign for list #15, send tomorrow at 10am, use our standard footer address"
List intelligence — "Show me all lists with more than 500 members, compare their active vs unsubscribed ratios, recommend which to target next"
Campaign performance analysis — "Pull stats for campaigns sent in Q1, identify the top 3 by click rate, what subject lines did they use?"
Contact migration — "Export all contacts from list 'Old Newsletter' and add them to list 'New Weekly Digest', preserve their custom fields"
Compliance-ready additions — "Add these 20 trade show contacts to list #8, mark source as 'Conference 2026', ensure they get the double opt-in email"

🔗 The Real Power: Combining Tools

AI can chain multiple Constant Contact operations together:

Query lists → Filter by engagement → Create targeted campaign → Track opens and clicks
Import contacts → Validate data → Auto-sort into segments → Trigger welcome campaign
Analyze campaign stats → Identify best performers → Clone winning templates → Schedule A/B tests

📦 What's Inside

7 powerful API tools covering Constant Contact's email marketing platform:

list_contacts — Query contacts with filters, segmentation, and pagination
add_contact — Create contacts with custom fields, phone numbers, and list memberships
list_campaigns — Browse email campaigns (activities) by date range
create_campaign — Build email campaigns with HTML, text, and required CAN-SPAM footer
list_lists — Get all contact lists with membership counts
add_to_list — Bulk-add contacts to lists via activity API
get_campaign_stats — Fetch tracking stats (sends, opens, clicks, bounces, unsubscribes)

All with proper error handling, OAuth2 authentication, and TypeScript types.

API Foundation: Constant Contact API v3 (REST)

🚀 Quick Start

Option 1: Claude Desktop (Local)

Clone and build:

git clone https://github.com/BusyBee3333/Constant-Contact-MCP-2026-Complete.git
cd constant-contact-mcp-2026-complete
npm install
npm run build

Get your Constant Contact OAuth2 access token:
- Go to Constant Contact Developer Portal
- Create an application or use an existing one
- Complete the OAuth2 authorization flow to get an access token
- You'll need: API Key, App Secret, and Access Token (with contact_data and campaign_data scopes)
- Note: Constant Contact requires OAuth2—you can't use a simple API key

Configure Claude Desktop:

On macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

On Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "constantcontact": {
      "command": "node",
      "args": ["/ABSOLUTE/PATH/TO/constant-contact-mcp-2026-complete/dist/index.js"],
      "env": {
        "CONSTANT_CONTACT_ACCESS_TOKEN": "your-oauth2-access-token"
      }
    }
  }
}

Restart Claude Desktop

Option 2: Deploy to Railway

Click the button above
Set CONSTANT_CONTACT_ACCESS_TOKEN in Railway dashboard
Use the Railway URL as your MCP server endpoint

Option 3: Docker

docker build -t constantcontact-mcp .
docker run -p 3000:3000 \
  -e CONSTANT_CONTACT_ACCESS_TOKEN=your-token \
  constantcontact-mcp

🔐 Authentication

Constant Contact uses OAuth 2.0 Bearer token authentication (API v3):

Header: Authorization: Bearer YOUR_ACCESS_TOKEN
Grant types: Authorization Code (for user accounts), Implicit (for quick testing)
Scopes required: contact_data, campaign_data
Token lifespan: Access tokens expire after 24 hours; use refresh tokens for long-term access
Rate limits: 10,000 calls/day on free trials, higher on paid plans

OAuth2 Setup Guide:

Register your app at: https://v3.developer.constantcontact.com/
Use the OAuth2 Playground or your own redirect URL
Store the access token securely
Implement refresh token logic for production use

The MCP server handles authentication automatically—just set CONSTANT_CONTACT_ACCESS_TOKEN.

🎯 Example Prompts for Email Marketers

Once connected to Claude, use natural language. Here are real email marketing workflows:

Campaign Management

"List all campaigns sent in the last 14 days"
"Create a campaign called 'Newsletter March 2026', subject 'Spring Updates', from marketing@mycompany.com"
"Show me campaigns with 'sale' in the name, what were their open rates?"

Contact Operations

"Find all contacts with email addresses from @gmail.com added this month"
"Add contact john@example.com to list #42, include first name 'John' and company 'Acme Corp'"
"List all contacts in the 'VIP Customers' list who haven't unsubscribed"

List Management

"Show me all my contact lists sorted by size, which has the most active members?"
"Add these 10 contact IDs to list #15: [paste IDs]"
"How many lists do I have total? Which ones were created this year?"

Performance Analysis

"Get stats for campaign activity #abc123xyz, what was the click-through rate?"
"Compare open rates for my last 5 campaigns, which performed best?"
"Show me bounce stats for campaign #789, were they hard or soft bounces?"

Bulk Operations

"Export all contacts from lists #10, #12, and #15 as JSON"
"Create 3 new campaigns from template, one for each product launch, schedule them for next week"
"Find all contacts with incomplete profiles (missing phone or address)"

🛠️ Development

Prerequisites

Node.js 18+
npm or yarn
Constant Contact account (free trial or paid)
OAuth2 application registered at https://v3.developer.constantcontact.com/

Setup

git clone https://github.com/BusyBee3333/Constant-Contact-MCP-2026-Complete.git
cd constant-contact-mcp-2026-complete
npm install
cp .env.example .env
# Edit .env with your Constant Contact access token
npm run build
npm start

Testing

npm test                  # Run all tests
npm run test:watch        # Watch mode
npm run test:coverage     # Coverage report

Project Structure

constant-contact-mcp-2026-complete/
├── src/
│   └── index.ts          # Main server implementation
├── dist/                 # Compiled JavaScript
├── package.json
├── tsconfig.json
└── .env.example

🐛 Troubleshooting

"Authentication failed" or "401 Unauthorized"

Verify your access token is valid (check expiration)
Ensure token has contact_data and campaign_data scopes
Refresh your OAuth2 token if it expired (24-hour lifespan)
Re-authorize your app at https://v3.developer.constantcontact.com/

"Rate limit exceeded"

Free trials: 10,000 calls/day
Paid plans: Higher limits (check your account tier)
Use pagination (limit parameter) and cache responses locally

"Tools not appearing in Claude"

Restart Claude Desktop after updating config
Check that the path in claude_desktop_config.json is absolute (not relative)
Verify the build completed: ls dist/index.js
Check Claude Desktop logs: tail -f ~/Library/Logs/Claude/mcp*.log

"Invalid list ID" or "Campaign not found"

List IDs and campaign IDs are UUIDs (e.g., abc-123-def)
Get valid IDs: "List all my contact lists" or "Show me recent campaigns"
Contact IDs are also UUIDs, not integers

"Missing required field: physical_address_in_footer"

CAN-SPAM compliance requires a physical address in email footers
Include the physical_address_in_footer object when creating campaigns
Or use a pre-configured account default address

📖 Resources

Constant Contact API v3 Docs — Official API reference
OAuth2 Setup Guide — How to get access tokens
Constant Contact Help Center — Tutorials and guides
MCP Protocol Spec — How MCP servers work
Claude Desktop Docs — Installing and configuring Claude
MCPEngage Platform — Browse 30+ business MCP servers

🤝 Contributing

Contributions are welcome! Please:

Fork the repo
Create a feature branch (git checkout -b feature/segment-builder)
Commit your changes (git commit -m 'Add contact segmentation tool')
Push to the branch (git push origin feature/segment-builder)
Open a Pull Request

📄 License

MIT License - see LICENSE for details

🙏 Credits

Built by MCPEngage — AI infrastructure for business software.

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