MCP HeartbeatTHE MCP OBSERVATORY
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Evidence for your next connection.

Independent measurements of remote MCP servers. Every observation has a timestamp.

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DiscoveryServer directory

Remote MCP servers

Find a server for your workflow, with connection evidence you can inspect.

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1434 servers

Ordered by checks passedClear filters
Dated server measurements. The status describes the last probe or a listed authentication requirement. Checks that have not been measured are not failures. Open a server to inspect the evidence.
Server / capabilityLast probeMedian latencyChecks passedLast checked
LocalProspects

Find local businesses on Google Maps with owner names, emails, phone line types and socials.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
Loice

B2B lead search, company employees, verified work emails, email and LinkedIn enrichment.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
LookupDock

Phone, email and IP signals for signup checks, with shared credits and explicit uncertainty.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
LotsBusiness

Get your business online and found: website, Google Business Profile, business email and listings

ProductivityCommunication & messaging

Requires authNot measured4 / 22
LotsMail

Business email on your own domain that your AI agent can read, search and draft in.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
LovedOne Family MCP

Authenticated MCP for one family household: loved ones, members, and Family Inbox plaintext.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
MachineMail

Email inboxes for AI agents. Send, receive, and read email with a trust report on every message.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
Mail for Bots

Email inboxes for AI agents: send, reply, read verification codes, human-approved drafts.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
MailAlign

Email header analyzer: SPF/DKIM/DMARC/ARC verdicts, domain alignment, hop delays. No lookups.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
MailBeast.ai

Run MailBeast.ai cold email from your AI assistant: campaigns, leads, mailboxes, replies, analytics.

Marketing & SalesCommunication & messaging

Requires authNot measured4 / 22
MailBots

Read verification codes (OTP) and test email sent to your catch-all test hostnames.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
Mailbox MCP

Read, send, file and search email in any Gmail, Microsoft 365 or IMAP mailbox, plus its calendar.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
Mailcheck: Email Open & Click Tracker

Email open and click tracker for Gmail, Outlook, Zoho Mail, Roundcube, Hostinger Mail and more.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
Mailcheer

Email API + newsletters. 17 MCP tools. OAuth 2.1 PKCE or API key. EU-hosted (Hetzner + SES).

Marketing & SalesCommunication & messaging

Requires authNot measured4 / 22Not checked yet
Mailera

Email for AI agents: read, search and send from your Gmail, Outlook, Yahoo, iCloud or IMAP inbox.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
Maileroo

Send email, search delivery logs, and manage domains and your Maileroo account.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
MailFixture

Test-inbox API for email and SMS: create inboxes, long-poll messages, extract OTPs and links.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
Mailfornet

Disposable email inboxes for AI agents: create an address, wait for the OTP or verify link.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
Mailing Engineer

E-Commerce Email Marketing, AI Newsletter Studio, DNS Audit & AWS SES Deliverability MCP.

E-commerceCommunication & messaging

Requires authNot measured4 / 22
Mailjet MCP Server and API by Cotlet

Mailjet marketing and transactional email MCP server: list contacts, create segment.

Marketing & SalesCommunication & messaging

Requires authOutdated checkNot measured4 / 22
MailMCP

Connect any mailbox to Claude, ChatGPT & AI: read, send, reply, schedule & search emails.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
Mails.ai — Agent Email

A real inbox for AI agents: send, receive and thread email, behind a prompt-injection firewall.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
Mailshake MCP Server and API by Cotlet

Mailshake cold email sales outreach MCP server: list campaigns, add recipients to a campaign.

Marketing & SalesCommunication & messaging

Requires authOutdated checkNot measured4 / 22
MailSlurp

Email and SMS inboxes for AI agents, plus email rendering, inbox placement and sender warmup.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet

Automated measurements. Not a rating. Unmeasured checks are not failures. How to read the evidence