Mailchimp MCP Server runs on your own machine — the client starts it, so there is no endpoint to ping. 257 installs a week from npm. Last commit 1 Nov 2026.
Mailchimp via MCP: draft, test, and send campaigns; manage audiences and subscribers; pull reports.
What the code does
We read the source, 21 h ago · rules 995398eba69f
What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.
? `No campaign reports match ${narrowing.map((key) => `\`${key}\``).join(', ')}; widen or drop ${narrowing.length > 1 ? 'those filters' : 'that filter'}.`
Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.
This code can reach further than it looks
We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.
Connect this server
This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.
claude mcp add mailchimp-mcp-server -e 'MAILCHIMP_API_KEY=<MAILCHIMP_API_KEY>' -- npx -y @cyanheads/mailchimp-mcp-server{
"mcpServers": {
"mailchimp-mcp-server": {
"command": "npx",
"args": [
"-y",
"@cyanheads/mailchimp-mcp-server"
],
"env": {
"MAILCHIMP_API_KEY": "<MAILCHIMP_API_KEY>"
}
}
}
}[mcp_servers.mailchimp-mcp-server]
command = "npx"
args = ["-y", "@cyanheads/mailchimp-mcp-server"]
env = { MAILCHIMP_API_KEY = "<MAILCHIMP_API_KEY>" }{
"mcpServers": {
"mailchimp-mcp-server": {
"command": "npx",
"args": [
"-y",
"@cyanheads/mailchimp-mcp-server"
],
"env": {
"MAILCHIMP_API_KEY": "<MAILCHIMP_API_KEY>"
}
}
}
}{
"servers": {
"mailchimp-mcp-server": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"@cyanheads/mailchimp-mcp-server"
],
"env": {
"MAILCHIMP_API_KEY": "<MAILCHIMP_API_KEY>"
}
}
}
}Put your own value in place of
<MAILCHIMP_API_KEY> (Mailchimp Marketing API key, including the '-dc' data-center suffix (e.g. 'abc...-us22'). Generate at Mailchimp → Account → Extras → API keys).
The author’s registry entry marks it as required.
Optional settings from the registry entry, left out of the block above:
MCP_TRANSPORT_TYPE (Selects the HTTP transport), MAILCHIMP_BASE_URL (Override the API base URL (for mock servers or testing). Defaults to 'https://{dc}.api.mailchimp.com/3.0' derived from the API key suffix), MAILCHIMP_TIMEOUT_MS (Per-request timeout in milliseconds), MAILCHIMP_MAX_RETRIES (Max retry attempts for transient upstream failures (0-10)), MAILCHIMP_CONCURRENCY_LIMIT (Max in-flight upstream requests across this process (1-10)), MCP_HTTP_HOST (The hostname for the HTTP server), MCP_HTTP_PORT (The port to run the HTTP server on), MCP_HTTP_ENDPOINT_PATH (The endpoint path for the MCP server), MCP_AUTH_MODE (Authentication mode to use: 'none', 'jwt', or 'oauth'), MCP_LOG_LEVEL (Minimum log level for output: debug, info, notice, warning, or error).
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Mailchimp MCP Server — questions
Answers built from our own checks of this server.