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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1587 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
Sendfeather

Send transactional email and check delivery: bounces, suppressions, per-provider stats.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
SendGuard

Check an email before your AI agent sends it: allow, review or block with reasons.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
SendHQ

Send and receive email from your verified domains; manage domains, templates and deliverability.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
Sending

Email, WhatsApp and Telegram for AI agents: send, campaigns, automations, contacts, agent inboxes.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
Sendocado

Activation and onboarding emails for software products, sent through your own email provider.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
SendPulse

Empower AI agents with SendPulse email, CRM, chatbot, SMTP, and course automation

ProductivityAutomation & workflows

Requires authNot measured4 / 22Not checked yet
Sendy SMS

Send SMS, verify phone numbers with one-time codes (OTP) and manage contacts in Israel.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
SentientMail

AI-first email platform: templates, audiences, journeys. Sends real email when the key allows it.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
Sentinel Briefing

Strategic monitoring and public affairs intelligence: watches, sourced notes, analysed articles.

ProductivityMonitoring & observability

Requires authOutdated checkNot measured4 / 22
Shape

Training calendar, workouts and health data from Garmin, Wahoo, Polar, Apple Health and more

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
ShipMyForm

Form backend as 29 tools: create endpoints, route submissions, publish pages, run the inbox.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
Sickle — every mailbox for your agent

Gmail, Outlook, iCloud, Fastmail and any IMAP mailbox for your agent. Scoped OAuth, approved sends.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
Sidekick Pro

AI executive assistant: email triage, inbox, calendar, files, memory, phone and connected apps.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
Siftsmith Company Signals

Open jobs from Workday, careers pages and ATSes, plus hiring, tech, intent, DMARC and launch signals

ProductivityFile & docs

Requires authNot measured4 / 22Not checked yet
Signal not Noise

AI-driven daily-focus todo app on your phone (max 3/day). View & add todos from any MCP client.

ProductivityFile & docs

Requires authNot measured4 / 22
Sivella

Read and update a Sivella household: tasks, calendar, budget, reminders, decisions and memory.

ProductivityKnowledge & memory

Requires authNot measured4 / 22
Skael API

Lead lists from Google Maps, websites, job boards and German company registers, with verified emails

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
Skilltage

AI-assisted applicant tracking: openings, CV evidence, candidate pipeline and recruiter-sent emails.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
SkipCalls

Manage your SkipCalls AI receptionists, calls, contacts, and calendars.

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
SkyOS

Main memory for Claude, ChatGPT or Codex: exact, dated notes of each project.

ProductivityAI / LLM tooling

Requires authOutdated checkNot measured4 / 22
Slackline

Chat with your AI agents from Slack: each gets a thread in your DM, and your replies there wake it.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
slicer Competitor Watch

Read what changed on competitor funnels, with screenshots, ads and emails, and start new runs.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
SlideDrift

Turn your notes, articles and ideas into LinkedIn posts in your brand, ready to edit and schedule.

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
Sliq

Run LinkedIn and email outbound from Claude, ChatGPT, or any AI agent.

ProductivityCommunication & messaging

Requires authNot measured4 / 22

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