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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2949 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
SendQuoteNow — AI Quote Engine for Contractors

Generate branded contractor quotes: hosted approval page, PDF, QR code, and Stripe payment link.

Finance & CryptoPayments & trading

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
SEOcrawl AI

Live Google Search Console data, keyword/page analysis, site audit and SEO tasks from SEOcrawl AI.

Marketing & SalesData access / search

Requires authNot measured4 / 22
SetLatch

Privacy requests (DSARs) for every site you run: triage, app look-ups, tasks and the audit trail.

OtherOther

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
Shard Connector for Obsidian

Hosted MCP server for Obsidian Sync vaults: read, search, edit notes. Not affiliated with Obsidian.

ProductivityData access / search

Requires authNot measured4 / 22
Shotkiln

Screenshot, PDF and Open Graph image API for AI agents: capture pages, render PDFs, make OG images.

MediaFile & docs

Requires authNot measured4 / 22Not checked yet
Sidekick Pro

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

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
Sigil e-signatures

Send a PDF or DOCX for e-signature as a pact, track its signers and fetch the signed copy.

OtherFile & docs

Requires authNot measured4 / 22Not checked yet
Sign PDF

Send a PDF, a Google Doc or Markdown for e-signature from chat, and get the signed PDF back.

OtherFile & docs

Requires authNot measured4 / 22
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
Signaliz

B2B lead generation, email verification, company enrichment, and agentic GTM Ops.

Marketing & SalesCommunication & messaging

Requires authNot measured4 / 22Not checked yet
SignKaro e-signature

Make contracts from templates, send them for e-signature by email, and track who has signed.

LegalCommunication & messaging

Requires authNot measured4 / 22
SimplePDF

Find your PDF forms, read their fields, prefill them for review and retrieve submissions

Developer ToolsFile & docs

Requires authOutdated checkNot measured4 / 22
SingleFax

Send a fax from Claude, ChatGPT, or Cursor. Upload a PDF, pay, get delivery status.

Developer ToolsAI / LLM tooling

Requires authOutdated checkNot measured4 / 22
Sivella

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

ProductivityKnowledge & memory

Requires authNot measured4 / 22
Skavio USDC Payment Verification & Proof MCP

USDC x402 proof/DNS and authenticated prepaid OCR, document and audio processing via card or USDC.

Finance & CryptoPayments & trading

Requires authNot measured4 / 22Not checked yet

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