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
thenetworkery

DNS, email auth, TLS, BGP/RPKI, WHOIS and subnet tools with plain-English fixes, plus webhook URLs.

ProductivityCommunication & messaging

Outdated check370 ms13 / 22
DJEN (Diário de Justiça)

Brazil's National Electronic Court Gazette (CNJ/DJEN), judicial publications and notifications. Sear

LegalCommunication & messaging

Responded373 ms13 / 22
WhatsApp

Connect a personal/Business WhatsApp account via QR pairing (multi-device, like WhatsApp Web). Send

Developer ToolsCommunication & messaging

Responded376 ms13 / 22
Catalogue App

Telegram bots in one click, emoji and sticker packs, and search across Telegram channels and apps.

OtherCommunication & messaging

Outdated check376 ms13 / 22
Kommo

Kommo CRM (formerly amoCRM), the conversation-first sales CRM (WhatsApp, Instagram, Telegram) used b

Developer ToolsCommunication & messaging

Responded379 ms13 / 22
DataCrazy

DataCrazy omnichannel CRM (WhatsApp, Instagram, Facebook) via the official API: leads, deals, pipeli

Marketing & SalesCommunication & messaging

Responded380 ms13 / 22
OCOLO Project Requests

Submit a data center colocation requirement to OCOLO; reaches 270+ providers. Email-verified.

ProductivityCommunication & messaging

Outdated check392 ms13 / 22
Portaur

Ask Portaur about its services and leave a message or callback request for the team.

OtherCommunication & messaging

Outdated check412 ms13 / 22
io.github.carbaj03/agent-cafe-idle-hour

Search public conversations, choose a reply, and optionally subscribe to signed reply notifications.

Developer ToolsCommunication & messaging

Outdated check416 ms13 / 22
zerm

Agent utility belt: memory, locks, webhook inboxes, timers, DNS, email, URL, timezone, cron

ProductivityCommunication & messaging

Outdated check435 ms13 / 22
GTM for One

Find companies that could buy from a business and draft the first cold emails, from its website.

ProductivityCommunication & messaging

Outdated check456 ms13 / 22
Voix contact

Reach a human at Voix: submit the studio contact form and get a reply by email.

ProductivityCommunication & messaging

Outdated check458 ms13 / 22
Bottled

Branded email on your own domain: send, reply, search, aliases, contacts and campaigns.

Marketing & SalesCommunication & messaging

Outdated check467 ms13 / 22
Signatoro

The agentic email signature platform: one saved signature for your people and your AI agents.

ProductivityCommunication & messaging

Outdated check486 ms13 / 22
io.github.Bluecraft-AI/machfive

Generate hyper-personalized cold email sequences via MachFive API.

Developer ToolsCommunication & messaging

Responded547 ms13 / 22
Universal Agents

Ask Universal Agents what we sell (Interplay), pricing, and FAQs; draft an intro email.

ProductivityCommunication & messaging

Outdated check595 ms13 / 22
Quant Agent Shop

Search, filings, sanctions, company, domain, email, SEO and weather tools, paid per call over x402.

Data & AnalyticsCommunication & messaging

Outdated check596 ms13 / 22
ai.sendraven/mcp

Email infrastructure for AI agents: send, read replies as threads, campaigns, per-key limits.

Marketing & SalesCommunication & messaging

Outdated check600 ms13 / 22
SignupBouncer

An API that checks new signups for disposable emails and repeat accounts.

ProductivityCommunication & messaging

Outdated check602 ms13 / 22
YouTube Email Finder

Find the contact email of YouTube channels from the link, the @handle or the channel_id. Resolves th

MediaCommunication & messaging

Responded618 ms13 / 22
WarmInboxes Free MCP: Fleet Planner

Read-only sizing and pricing for cold email inboxes: how many, which provider, what it costs.

ProductivityCommunication & messaging

Outdated check622 ms13 / 22
Spur

Real estate leads, skip tracing, direct mail, SMS & email outreach, and marketing automations

Real Estate & PropertyCommunication & messaging

Outdated check636 ms13 / 22
AstraVerify Domain Trust Check

Email security and AI discoverability scores for any domain, with the exact record or tag to fix.

ProductivityCommunication & messaging

Outdated check660 ms13 / 22
ai.radmail/radmail-mcp

Email OS for agents - real-inbox search, triage, commitments, and a verifiable BEC hard-stop.

ProductivityCommunication & messaging

Outdated check662 ms13 / 22

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