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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1583 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
volai

Czech telephony API and MCP: numbers, calls, SMS, voice agents, calendars and invoices.

ProductivityPayments & trading

Requires authNot measured5 / 22Not checked yet
VOMO

Find and read your VOMO meeting notes and transcripts. OAuth sign-in; read-only access.

ProductivityCode & DevOps

Requires authNot measured5 / 22
Voxisim

Virtual phone numbers and SMS verification codes for AI agents: 800+ services, 200+ countries.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured5 / 22
Warm Inbox

Email warm-up for AI builders: check deliverability, connect mailboxes, pause or tune warm-ups.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Web Content & URL Tools

26 tools: web pages to Markdown, metadata, tech stack, SSL, SEO, domains, email auth and SSO checks.

ProductivityCommunication & messaging

Requires authNot measured5 / 22Not checked yet
Winnr

Cold email infrastructure: buy domains, create SMTP mailboxes, set DNS, run warming, read mail.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured5 / 22
WriteStack

Draft & schedule Substack Notes, manage articles, and read stats via WriteStack.

ProductivityFile & docs

Requires authNot measured5 / 22Not checked yet
XLS.now MCP Server

Convert XLS spreadsheets to modern document, image and spreadsheet formats.

ProductivityFile & docs

Requires authNot measured5 / 22Not checked yet
XLSX.now MCP Server

Convert XLSX spreadsheets to and from XLS, CSV, PDF, JPG, HTML and ODS.

ProductivityFile & docs

Requires authNot measured5 / 22Not checked yet
xNotepad AI

Create, search, and update notes in an xNotepad AI notebook, with semantic search and AI Q&A.

ProductivityData access / search

Requires authNot measured5 / 22Not checked yet
Xodo Sign MCP by usefulapi

List and read documents and templates; send reminders, cancel or trash documents in Xodo Sign.

ProductivityFile & docs

Not measuredNot measured5 / 22Not checked yet
zoomfort

Receive-only inbox for AI agent sign-ups: one call returns the verification code. Never sends.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured5 / 22
io.foqal/Foqal

Foqal turns Slack/Teams into efficient support platforms with AI-powered ticketing.

ProductivityCommunication & messaging

Outdated checkNot measured4 / 22
org.scienceswarm/commerce-validators

Commerce validators: live EU VAT (VIES), EORI, email/MX lookups; IBAN/ABA/GTIN checksums; VAT rates.

ProductivityCommunication & messaging

Outdated checkNot measured4 / 22
AgentKit x402 - pay-per-call tools for agents

Email, DNS, SPF/DMARC, site contacts, Markdown, IBAN, Swedish validators. Pay per call (x402).

ProductivityCommunication & messaging

Outdated checkNot measured4 / 22
AI-operated. Email authentication reader: six free tools, no key, no signup.

AI-operated. Free SPF (RFC 7208 count), DMARC, MTA-STS, DMARC rua/ruf readers. Paid audit $29.

ProductivityCommunication & messaging

Outdated checkNot measured4 / 22
AIsa Agent Mail

Inboxes, threads, drafts and sending, built for agents.

ProductivityCommunication & messaging

Outdated checkNot measured4 / 22
AIsa Creator Discovery

Find creators from a seed profile or a brief, and look up their contact email.

ProductivityData access / search

Outdated checkNot measured4 / 22
Cronch

Cron jobs for your body: meals, water and breaks planned around your calendar, one tap to do.

ProductivityAutomation & workflows

Outdated checkNot measured4 / 22
Inthread

Sign in with email or GitHub. Invite others. Agent-to-agent, threaded, async MCP message inbox.

ProductivityCommunication & messaging

Outdated checkNot measured4 / 22
Local Compliance OS

Generate small-business compliance calendars and renewal checklists.

ProductivityFile & docs

UnreachableNot measured4 / 22
M365 Graph MCP

Manage Microsoft 365 email, calendar, contacts and inbox rules via the Graph API with OAuth 2.0.

ProductivityCommunication & messaging

Outdated checkNot measured4 / 22
maxcv — CV tailoring

Score and tailor your CV/resume against a job posting — for AI agents and humans, no-login trial.

ProductivityFile & docs

UnreachableNot measured4 / 22
OIO

Projects, tickets, notes and to-dos in OIO, the freelance workspace. OAuth sign-in, Pro plan.

ProductivityFile & docs

UnreachableNot measured4 / 22

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