Customer.io MCP by usefulapi MCP Server

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answering

Customer.io MCP by usefulapi is answering right now. Last checked 11 min ago. It exposes 13 tools. Last commit 2 Nov 2026.

Query people, segments, campaigns, and message deliveries; send transactional email or broadcasts.

Uptime history 91 days of history · worst day 0%

91 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

164 ms

Response time

average over 24h

Stars

last commit 2 Nov 2026

What changed 45

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 1 October 2026. No other catalogue keeps this.

2 Nov a tool changed version

31 Oct a tool changed version4 times that day

30 Oct a tool changed version2 times that day

29 Oct a tool changed version2 times that day

28 Oct a tool changed version2 times that day

27 Oct a tool changed version

25 Oct a tool changed version4 times that day

24 Oct a tool changed version3 times that day

23 Oct a tool changed version

22 Oct a tool changed version

and 35 more, back to 1 October 2026

Customer.io MCP by usefulapi missed one check this week

Everything else answered, so this is steady rather than shaky. We check every 15 minutes, which is how a one-off gets told apart from the start of a pattern, and how you hear about the next one within the hour instead of from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add customerio --transport http https://customerio.usefulapi.io/mcp

Settings → Connectors → Add custom connector, then paste this address

https://customerio.usefulapi.io/mcp

~/.codex/config.toml

[mcp_servers.customerio]
url = "https://customerio.usefulapi.io/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "customerio": {
      "url": "https://customerio.usefulapi.io/mcp"
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "customerio": {
      "type": "http",
      "url": "https://customerio.usefulapi.io/mcp"
    }
  }
}

Available tools 13

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

customerio

customerio_get_campaign

Get a single campaign by id. App API: GET /v1/campaigns/{campaign_id}.

customerio_get_campaign_metrics

Get delivery/engagement metrics for a campaign over time. App API: GET /v1/campaigns/{campaign_id}/metrics.

customerio_get_customer_attributes

Get a single person's attributes (profile fields). App API: GET /v1/customers/{customer_id}/attributes.

customerio_get_customer_messages

List messages (deliveries) sent to a single person. App API: GET /v1/customers/{customer_id}/messages.

customerio_get_customer_segments

List the segments a single person belongs to. App API: GET /v1/customers/{customer_id}/segments.

customerio_list_campaigns

List all campaigns in the workspace. App API: GET /v1/campaigns.

customerio_list_collections

List reusable data collections in the workspace. App API: GET /v1/collections.

customerio_list_exports

List data exports in the workspace. App API: GET /v1/exports.

customerio_list_messages

List sent messages (deliveries) across the workspace, filterable by type/campaign/newsletter. App API: GET /v1/messages.

customerio_list_segments

List all segments in the workspace (id + name + type). App API: GET /v1/segments.

customerio_search_customers

Search/list people by a Customer.io filter (segment or attribute conditions). e.g. filter={"segment":{"id":7}} or {"and":[...]}. App API: POST /v1/customers.

customerio_send_transactional_email

⚠️ SENDS A REAL EMAIL. Send a transactional email using a transactional message template. Delivers immediately to the `to` recipient. App API: POST /v1/send/email.

customerio_trigger_broadcast

⚠️ SENDS TO REAL RECIPIENTS. Trigger an API-triggered broadcast, delivering to the resolved recipient set. App API: POST /v1/send/broadcast (posts to /v1/campaigns/{broadcast_id}/triggers).

Endpoints

URL	Transport	State	Latency	Checked
https://customerio.usefulapi.io/mcp	streamable-http	answering	81 ms	11 min ago

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Customer.io MCP by usefulapi — questions

Answers built from our own checks of this server.

What can Customer.io MCP by usefulapi do?

It exposes 13 tools, read directly from the server on our last check. Among them: customerio_get_campaign, customerio_get_campaign_metrics, customerio_get_customer_attributes, customerio_get_customer_messages, customerio_get_customer_segments, customerio_list_campaigns and 7 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is Customer.io MCP by usefulapi working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 164 ms. The bar chart above shows every period we have measured.

How do I connect Customer.io MCP by usefulapi?

Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Customer.io MCP by usefulapi need an API key?

No. Customer.io MCP by usefulapi completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 13 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Customer.io MCP by usefulapi?

It answers our handshake in 164 ms on average, which is faster than 79% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Customer.io MCP by usefulapi open source?

The code is open source: it is published under the MIT licence, written in JavaScript, 1 stars on GitHub and 1 open issue. The licence covers the code in the repository, not the hosted service at customerio.usefulapi.io, which runs on its operator's own terms.