Customer.io MCP by usefulapi MCP server

online · 100% uptime

by usefulapi.io·io.usefulapi/customerio·v1.33.0

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

D42/100grade D

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D42/100

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0 stars

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Nobody has reviewed Customer.io MCP by usefulapi yet.

If you have run it, two minutes of your experience saves the next person an afternoon.

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Against every graded Email MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score: 42/100; higher than 7% of 914 Email servers
Uptime: 100%; of our recent checks; the typical remote Email server answers 100%
Response time: 259 ms; faster than 56% of 607 Email servers

Release history: 13 versions in the registry since 2026-07-17, latest 2026-10-31, typically one every 1 day.

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

Is Customer.io MCP by usefulapi MCP server safe?: Not recommended: it is graded D (42/100). Read the Customer.io MCP by usefulapi safety report
How do I install Customer.io MCP by usefulapi?: It runs remotely at customerio.usefulapi.io. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.
Does Customer.io MCP by usefulapi need an API key?: Not as far as the registry entry and our scan can tell: no credentials are declared or required.
Is Customer.io MCP by usefulapi maintained?: The last commit was 62 days ago (2026-09-01). The latest release is v1.33.0.
Is Customer.io MCP by usefulapi up?: 100% of our last 28 checks got an answer. We check remote servers about four times a day.
What can I use instead of Customer.io MCP by usefulapi?: Servers from other publishers that do the same job: Sendraven MCP server, MisarMail MCP Server and SendGrid Transactional MCP server.
How does Customer.io MCP by usefulapi compare with other Email MCP servers?: safety score 42/100 (higher than 7% of 914 Email servers); uptime 100% (of our recent checks; the typical remote Email server answers 100%); response time 259 ms (faster than 56% of 607 Email servers). Full comparison.

Same job from other publishers: the closest match first, then the best rated.

Sendraven
Email infrastructure for AI agents: send, read replies as threads, campaigns, per-key limits.
not reviewed
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B
MisarMail MCP Server
Send transactional email, run campaigns, manage contacts and automations, audit deliverability.
not reviewed
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A
SendGrid Transactional
SendGrid transactional email: preflight send, templates, and delivery diagnostics.
not reviewed
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B
Postmark
Send, track, and manage transactional and bulk email delivery
not reviewed
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B
Nitrosend
AI-native email marketing. Campaigns, automations, transactional, contacts, and analytics.
not reviewed
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A

With the gateway added, ask your agent for it by name:

agent prompt

call io.usefulapi/customerio → <tool>

Free per call. Metered, capped by your key, logged for reliability.

https://customerio.usefulapi.io/mcp

streamable-http

Claim it to keep the listing current and reply to reviews. Claiming never changes the grade or hides a review.

Shows the safety grade and links back to this page. It updates itself after every scan and review.

[![mcp.market](https://mcp.market/badge/usefulapi-customerio.svg)](https://mcp.market/server/usefulapi-customerio)