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Constant Contact API and MCP server

Constant Contact's official agent tooling is built for transactional email, so it cannot work your lists, campaigns or reports. Sign in to Constant Contact once in your own Cloud Browser, and your AI agent does the work there for you. The same tools work over MCP for agents and as a REST API for scripts.

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Not affiliated with Constant Contact.

Constant Contact has no API for this. So we run one for you.

Constant Contact's own API, a GitHub MCP server and Cotlet compared
What you need Constant Contact's APIGitHub MCP serverCotlet
Lists, campaigns, reports No Partly Yes, 12 tools
Acts as you, signed in 24/7 No No Yes, Cloud Browser
Fixed for you when Constant Contact changes N/A No Yes, tested every 6h
Runs with your laptop off N/A No Yes, hosted

Checked Oct 22, 2026. Sources: Constant Contact for Agents (developer beta) · Constant Contact V3 API release notes · Constant Contact developers: Email reporting overview · Constant Contact developers: Contact lists overview

Your own Cloud Browser, on 24/7. Sign in once. We keep it connected.

  1. 01Sign in to Constant Contact in your own Cloud Browser

  2. 02Connect it for your agents

  3. 03Cotlet keeps it signed in and working

How do I connect Constant Contact to Claude, ChatGPT or my code?

AI agents connect over MCP, scripts call the REST API. Both reach the same 12 tools with one API key.

For AI agents: MCP

Add Cotlet to your agent once. Constant Contact and every other app you connect show up as its tools.

  • Claude
  • ChatGPT
  • OpenClaw
  • Hermes
  • GrokBot
  • Cursor
  • n8n
  • Any MCP client
  1. 1

    Add Cotlet to your agent

    Claude Code
    claude mcp add --transport http cotlet \
  https://cotlet.dev/mcp/v1 \
  --header "Authorization: Bearer $COTLET_API_KEY"
    Cursor
    {
  "mcpServers": {
    "cotlet": {
      "url": "https://cotlet.dev/mcp/v1",
      "headers": {
        "Authorization": "Bearer ${COTLET_API_KEY}"
      }
    }
  }
}
    Codex
    # ~/.codex/config.toml
[mcp_servers.cotlet]
url = "https://cotlet.dev/mcp/v1"
bearer_token_env_var = "COTLET_API_KEY"

    Paste the snippet for your client. The same server and key serve every app you connect, so you do this once.

For scripts: REST API

Every tool is an endpoint under /api/v1/constant-contact with its own method and path, such as POST /api/v1/constant-contact/emails/{email_id}, with the same API key. Our open-source repo has ready scripts to start from.

REST API docs

What can the Constant Contact API and MCP server do?

12 tools on your own Constant Contact account. Agents call them as operations of the MCP tools constant_contact_read and constant_contact_write; scripts call each one at its own REST endpoint, with the same inputs and answers.

API reference
Constant Contact tools in Cotlet's MCP server and REST API
Tool What it does Access
list_emails Emails in Channels > Emails with name, subject and status, filtered by status. read
get_email_report Sends, bounces, opens, clicks, unsubscribes and did-not-open of one sent email, with its rates. read
list_email_contacts Contacts who did not open, opened, clicked, bounced or unsubscribed from one sent email. read
list_lists Your contact lists with name and number of contacts. read
list_segments Your saved segments with name. Account Owners and Account Managers only. read
list_contacts Contacts of the account, of one list or of one segment, with email, name and permission to send. read
get_contact One contact with email, name, permission to send, lists and tags. read
create_list Create an empty contact list with a unique name. write
add_contacts_to_list Add up to 500 contacts, or a whole segment, to a list. writeasks first
remove_contacts_from_list Take contacts off a list; they stay in your account. write
copy_email Make a draft copy of an existing email. write
send_email Send a draft now or schedule it up to a year ahead, to lists or one segment. writeasks first

Scroll the table for all 12 tools.

Ask in plain words. Your agent does the rest.

All Constant Contact use cases

Is it safe to connect Constant Contact?

You sign in yourself in your own Cloud Browser, we never save your password, and anything that reaches your readers waits for your OK. The browser profile is encrypted in the EU. Independent scanners grade cotlet.dev A+.

Security overview

How much do the Constant Contact API and MCP server cost?

One price for both: a tool call costs the same over MCP or REST. Free 7-day trial with 2,000 credits, no card needed. Then one-time credit packs, no subscription, valid 12 months. Most calls use 25 credits, and your Cloud Browser uses 50 credits a day while Constant Contact is enabled for agents, so 20 calls a day come to 550 credits.

See full pricing
Cotlet credit packs: price, credits and calls at 25 credits each
Credits Price, one time Calls at 25 credits Per 1,000 credits
5,000 $29 200 $5.80
15,000 $79 600 $5.27
32,000 $149 1,280 $4.66
60,000 $249 2,400 $4.15

Only successful calls use credits; failed calls and timeouts cost nothing. At a balance of 0 calls pause, never a surprise charge. Authenticate with the Authorization: Bearer header.

Questions

Does Constant Contact have an API?

Constant Contact has a full public REST API, v3, for contacts, lists, email campaigns and reports, and an official MCP server in beta that is built for transactional email (checked 22 Oct 2026). The MCP server does not work the lists, campaigns and reports of your marketing account. For the API you register an app, and since July 2026 a new app stays private to the user who created it until Constant Contact support approves it.

How do I get access?

Sign up free, open Constant Contact under Integrations in the console and press Request access. Your free trial starts with your account, no card needed.

Is the MCP server different from the API?

No, only the way in. Cotlet builds each integration as a REST API and puts an MCP server on top, so both have the same 12 tools, the same inputs and answers, one API key and one price. AI agents such as Claude, ChatGPT or Cursor use MCP; scripts, cron jobs and HTTP steps in n8n, Make or Zapier use the REST API.

What is the Cloud Browser?

Your own Chrome that Cotlet runs for you in the EU, around the clock. You open it from the console, sign in to Constant Contact yourself and press Enable for agents. Your agent's calls go through it, from its IP with its cookies, so Constant Contact sees the browser you signed in with. Password saving is off and the profile is stored encrypted with AES-256-GCM.

Can my agent act without asking me?

Not on anything that reaches other people: add_contacts_to_list, send_email wait for your OK by default. You can switch that off per tool for scheduled runs.

Which Constant Contact role does my agent need?

An Account Owner or Account Manager login. Both can manage lists and contacts, view reports and send emails; a Campaign Creator can build emails but cannot send them or work with contacts. Segments are also for Owners and Managers (checked 22 Oct 2026).

Does this replace the official Constant Contact for Agents MCP server?

No, they do different jobs. The official beta is a developer API and MCP server for sending transactional email from your own code. Cotlet works the marketing account you already use: its lists, contacts, campaign reports and scheduled sends.

Should I use a Constant Contact MCP server from GitHub instead?

Pick one if you want the code on your own computer and do not mind the upkeep: you install it, sign it in and fix it when Constant Contact changes. Pick Cotlet if you want it hosted and kept working for you.

Can I use it in n8n, Make or Zapier?

Yes. Add https://cotlet.dev/mcp/v1 in n8n's MCP Client node, or call the REST endpoints from an HTTP step in Make or Zapier.

Who runs Cotlet?

Cotlet is run by Take Group, a Polish software company working since 2019. Take Group runs about 3,200 websites on its own systems and has its own DevOps team for infrastructure security. We built and used integrations like this inside the company for years before opening them as Cotlet.

Is Cotlet affiliated with Constant Contact?

No. Cotlet is independent and not affiliated with Constant Contact.

Give your agent access to Constant Contact.

Free 7-day trial with 2,000 credits, no card needed.

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