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
SmoothSign

Send PDFs for e-signature by email and SMS code. Check signing status. No document storage.

ProductivityCommunication & messaging

Requires authNot measured4 / 22
SMS Vert Pro

French SMS platform for AI agents: bulk & scheduled SMS, OTP, delivery reports, replies, STOP list.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
SMTPfast

Send and receive email, and manage templates, inboxes, contacts and broadcasts.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
socket.help

Email inboxes, webhooks, mock APIs, 2FA codes, approvals and 170 tools for AI agents.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
SOKI (想起) — Personal Memory

Personal memory outside the AI. Due dates, loose ends and old notes come back on their own.

ProductivityKnowledge & memory

Requires authNot measured4 / 22
Solotet

A shared board your Claude projects read and write: handoffs, @mentions, pinned notes.

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
SotoGoal

Goal-centered work: read and write goals, tasks, notes and attachments, and decide what to do next.

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
Soycasero

Long-term rentals in Spain: upload the lease, get deadlines, IRAV/IPC rent updates and reminders.

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
SpacePost

Send email and manage domains, contacts and webhooks on SpacePost, the Resend-compatible email API.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
Sparetext

Send and read real SMS from your own Android phone or iPhone: texts, replies and conversations.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
Sparks

Your Sparks idea notebook: read, create and organize notes, projects and subtasks.

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
Spellar

Read your Spellar meetings, transcripts and action items from an AI assistant, and update them.

ProductivityFile & docs

Requires authNot measured4 / 22
SphereScout

Local business lead lists worldwide: count by category and place, then export emails and phones.

ProductivityCommunication & messaging

Requires authOutdated checkNot measured4 / 22
Stash Squirrel

Todos, notes, bookmarks and calendar events — read, add, plan and tidy them.

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
Stash: Remember Everything

Stash by Grafted Software. Search, read, save and summarize notes (Ask notes with Stash Pro)

ProductivityData access / search

Requires authOutdated checkNot measured4 / 22
static.md

Markdown notes and whiteboards your AI agent can read and write.

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
Stein Investments

REVDEN's classified market state, empirical economic calendar, research register, AlgoCheck reviews.

ProductivityFile & docs

Requires authNot measured4 / 22Not checked yet
Stori Candidate Intelligence

Read-only candidate intelligence — hiring questions answered from real interview transcripts.

ProductivityFile & docs

Requires authNot measured4 / 22
Strunk

Publish drafts to Google Docs for review, then revise and resolve reviewer comments in your AI tool

ProductivityFile & docs

Requires authOutdated checkNot measured4 / 22
SubDupes

Send the subscriptions Claude or ChatGPT finds in your email to SubDupes. You approve each one.

ProductivityPayments & trading

Requires authNot measured4 / 22
Sumibako

Write pages into your notes vault, search them, and publish one as a shareable link.

ProductivityData access / search

Requires authOutdated checkNot measured4 / 22
SummitScribe

Read your SummitScribe meeting notes, transcripts and action items. Read-only.

ProductivityFile & docs

Requires authNot measured4 / 22Not checked yet
SuperMailOS

Read, search, organize, draft and send business email from your SuperMailOS mailboxes.

ProductivityCommunication & messaging

Requires authNot measured4 / 22Not checked yet
Swarm Bar

A bar where humans and AI agents leave notes. Read, post, and reply.

ProductivityFile & docs

Requires authNot measured4 / 22Not checked yet

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