MCP HeartbeatTHE MCP OBSERVATORY
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Evidence for your next connection.

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

Read-only probes

DiscoveryServer directory

Remote MCP servers

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

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1424 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
LayerCall

Score an IP, email, phone, domain or device for fraud in one call, with the signals behind it.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Layrcake

Go-to-market infrastructure for AI agents: find leads, verify emails, read signals, run campaigns.

Marketing & SalesCommunication & messaging

Requires authNot measured5 / 22
LeadMerlin

Local business leads by niche and city: owner names, checked emails, phone line types, site tech.

Marketing & SalesCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Leporis WhatsApp

Send and read WhatsApp messages on your Leporis account from AI coding agents, via your own API key.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun

Letterkeel: send email from your own domain via SMTP, Resend, SendGrid, Mailgun, Postmark

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Letterkeel: Send Email via SMTP, Resend, SendGrid & Mailgun

Letterkeel: send email from your own domain via SMTP, Resend, SendGrid, Mailgun, Postmark

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Likelyread

Email open tracking for agents: add a pixel, register the send, read back who opened it

MediaCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Linkedcamp

LinkedIn and email outreach: campaigns, unified inbox, leads, analytics and reports.

Marketing & SalesCommunication & messaging

Requires authOutdated checkNot measured5 / 22
LinkedIn MCP Server and API by Cotlet

LinkedIn professional networking platform MCP server: create post, comment on post, send message.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22
Requires authNot measured5 / 22Not checked yet
ListCheckup

Email verification for AI agents: check addresses and lists, priced before credits are spent.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Local Business Leads

Google Maps places with emails, phones and the tech stack of their websites. Runs on Apify.

Marketing & SalesCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Lockally Email

Stateful email for AI agents: read inboxes, reply in-thread, draft with approval.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
LookupLab

Phone carrier, email domain, IP network and DNS checks using your LookupLab account.

Developer ToolsCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Lumail

Official Lumail email marketing MCP for campaigns, subscribers, and workflows.

Marketing & SalesCommunication & messaging

Requires authNot measured5 / 22
Mailbuttons

Governed email for AI agents: a sandbox inbox to read and send from, human approval to go external.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Mailcannon

AI-powered email outreach platform — send campaigns with deliverability tracking.

Marketing & SalesCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Mailercloud

AI tools for Mailercloud email marketing: campaigns, contacts, templates, sending & analytics.

Marketing & SalesCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Mailgi

Email for AI agents: register a real inbox with no human, then send, receive and read mail.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Mailly

A real inbox for agents: read mail, draft replies you approve, wait for verification codes.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured5 / 22
MailMask

Email for agents: domains, aliases, IMAP mailboxes, DNS, sending and webhooks via one API key.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured5 / 22
mailmcp

Your mailboxes in ChatGPT and Claude: Gmail, iCloud, Fastmail, any IMAP. Passwords stay yours.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured5 / 22
Mailows

Give AI agents their own email inboxes: list, read and send mail via scoped, revocable OAuth grants.

ProductivityCommunication & messaging

Requires authNot measured5 / 22
MailProbe

Verify email addresses in real time: deliverability, disposable and role addresses, typo fixes.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet

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