MailerCheck MCP by usefulapi MCP Server

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answering

MailerCheck MCP by usefulapi is answering right now. Last checked 12 min ago. It exposes 6 tools. Last commit 1 Nov 2026.

Check MailerCheck credits and lists, and run confirmed asynchronous email verification.

Uptime history 63 hours of history

63 hours agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

190 ms

Response time

average over 24h

Stars

last commit 1 Nov 2026

What changed 6

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 30 October 2026. No other catalogue keeps this.

31 Oct a tool changed version4 times that day

30 Oct a tool changed version2 times that day

and 4 more, back to 30 October 2026

Nothing serious here today

Today is the operative word: we check MailerCheck MCP by usefulapi every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

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

https://mailercheck.usefulapi.io/mcp

~/.codex/config.toml

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

.cursor/mcp.json

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

.vscode/mcp.json

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

Available tools 6

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

mailercheck

mailercheck_account

Read the connected MailerCheck account name, ID and credit balance. Does not verify emails or spend verification credits.

mailercheck_credits

Read the available MailerCheck verification credit balance without starting verification.

mailercheck_get_list

Read one existing list's verification status and aggregate result counts. Does not start or restart verification.

mailercheck_lists

Read one bounded page of list summaries, processing status and statistics. Does not create, verify or delete lists. Pagination stays on the MailerCheck API; no response links are followed.

mailercheck_verification_result

Read the status and result of a previously submitted asynchronous email check. Does not start new verification. Call once and wait before polling again; no automatic polling is performed.

mailercheck_verify_email

Submit one email for asynchronous verification. Spends MailerCheck credits and requires confirm:true. This call is never retried. Read the returned verification ID with mailercheck_verification_result; wait between polls. If the response is lost, check MailerCheck before submitting again.

Endpoints

URL	Transport	State	Latency	Checked
https://mailercheck.usefulapi.io/mcp	streamable-http	answering	147 ms	12 min ago

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MailerCheck MCP by usefulapi — questions

Answers built from our own checks of this server.

What can MailerCheck MCP by usefulapi do?

It exposes 6 tools, read directly from the server on our last check. Among them: mailercheck_account, mailercheck_credits, mailercheck_get_list, mailercheck_lists, mailercheck_verification_result, mailercheck_verify_email. 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 MailerCheck 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 190 ms. The bar chart above shows every period we have measured.

How do I connect MailerCheck 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 MailerCheck MCP by usefulapi need an API key?

No. MailerCheck MCP by usefulapi completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 6 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is MailerCheck MCP by usefulapi?

It answers our handshake in 190 ms on average, which is faster than 73% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is MailerCheck 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 mailercheck.usefulapi.io, which runs on its operator's own terms.