mcpbeat

Customerio MCP Server

io.usefulapi/customerio
not responding

Customerio is listed as active in the registry but did not answer our last check. Last commit 1 Aug 2026.

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

Uptime history 40 hours of history · worst hour 0%
40 hours agonow
29.7%
Uptime 24h
27 of 91 checks
—
Tools
hidden behind auth
187 ms
Response time
average over 24h
0
Stars
last commit 1 Aug 2026

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

run in your terminal
claude mcp add customerio --transport http https://customerio.usefulapi.io/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "customerio": {
      "url": "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
{
  "mcpServers": {
    "customerio": {
      "url": "https://customerio.usefulapi.io/mcp"
    }
  }
}

Endpoints

URLTransportStateLatencyChecked
https://customerio.usefulapi.io/mcp streamable-http answering 48 ms 8 min ago

Customerio — questions

Answers built from our own checks of this server.

Is Customerio working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 27 of 91 checks got a reply (29.7%), average response time 187 ms. The bar chart above shows every period we have measured.
The registry lists Customerio as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect Customerio?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Customerio need an API key?
No. Customerio completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. This is what we observed, not what the docs claim.
How fast is Customerio?
It answers our handshake in 187 ms on average, which is faster than 65% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Customerio open source?
Yes — it is published under the MIT licence, written in JavaScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.