MCP server

Customer.io MCP by usefulapi

io.usefulapi/customerio

Checked 26 Oct 2026, 08:29 UTC · Connected to it and listed its tools

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

Website Source

At a glance

Type

MCP server

Publisher

usefulapi.io (verified by the MCP Registry)

Status

Working at last check

Tools

13

Token cost

About 2,108 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

26 Oct 2026, 08:29 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

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

Antigravity

agy mcp add customerio https://customerio.usefulapi.io/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"customerio","server_url":"https://customerio.usefulapi.io/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"customerio","server_url":"https://customerio.usefulapi.io/mcp"}

Tools

• customerio_get_campaign ~93 tokens
  Get a single campaign by id. App API: GET /v1/campaigns/{campaign_id}.
• customerio_get_campaign_metrics ~196 tokens
  Get delivery/engagement metrics for a campaign over time. App API: GET /v1/campaigns/{campaign_id}/metrics.
• customerio_get_customer_attributes ~117 tokens
  Get a single person's attributes (profile fields). App API: GET /v1/customers/{customer_id}/attributes.
• customerio_get_customer_messages ~163 tokens
  List messages (deliveries) sent to a single person. App API: GET /v1/customers/{customer_id}/messages.
• customerio_get_customer_segments ~101 tokens
  List the segments a single person belongs to. App API: GET /v1/customers/{customer_id}/segments.
• customerio_list_campaigns ~64 tokens
  List all campaigns in the workspace. App API: GET /v1/campaigns.
• customerio_list_collections ~69 tokens
  List reusable data collections in the workspace. App API: GET /v1/collections.
• customerio_list_exports ~63 tokens
  List data exports in the workspace. App API: GET /v1/exports.
• customerio_list_messages ~244 tokens
  List sent messages (deliveries) across the workspace, filterable by type/campaign/newsletter. App API: GET /v1/messages.
• customerio_list_segments ~69 tokens
  List all segments in the workspace (id + name + type). App API: GET /v1/segments.
• customerio_search_customers ~226 tokens
  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 messages · ~384 tokens
  ⚠️ 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 messages · ~319 tokens
  ⚠️ 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).

Browse

• Email
• Email marketing

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