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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2874 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
FlutterSDK Docs

Search Wind UI, Magic, Dusk, Telescope and Artisan documentation. Hosted, public, no auth.

Developer ToolsFile & docs

Outdated check272 ms14 / 22
Domain Mail Check

Check a domain's email DNS, whether Gmail and Outlook accept its mail, and its registration.

ProductivityCommunication & messaging

Outdated check291 ms14 / 22
AgencyBloc MCP by usefulapi

Read and update AgencyBloc individuals, groups, policies and agents; log activities and notes.

ProductivityFile & docs

Responded293 ms14 / 22
ContrastAPI

55 tools, 7 Resources, Sigma rules, email SPF/DMARC, MITRE, CVE/KEV, risk_score. No key.

ProductivityCommunication & messaging

Outdated check303 ms14 / 22
Email Engagement Report

Email Engagement Report turns a raw email event export into a per-recipient engagement report.

ProductivityCommunication & messaging

Outdated check311 ms14 / 22
Document Tools

Count words, translate a web page you own, or make a calendar .ics or CSV file.

ProductivityFile & docs

Outdated check313 ms14 / 22
FileForge

File tools for your AI chat: PDF tables to Excel, merge PDFs, images to PDF, fill PDF forms.

MediaFile & docs

Outdated check318 ms14 / 22
io.github.serg-tanichev/email-spam-tester

Test an email before it goes out: a disposable address, 41 checks with RFC citations, a fix plan.

Developer ToolsCommunication & messaging

Outdated check319 ms14 / 22
DokuTrak

Let your agent chase the documents: create, chase, read and collect DokuTrak Document Requests.

Developer ToolsFile & docs

Outdated check330 ms14 / 22
Confirme, by Synapse

Did it really happen? Independent signed receipts for AI agents: page, domain, email, heartbeat.

ProductivityCommunication & messaging

Outdated check339 ms14 / 22
Velox TriFit: Virtual Try-On API

Virtual try-on (VTO) API docs and SDK examples; OAuth account/guest photo uploads and try-ons.

Developer ToolsCode & DevOps

Responded353 ms14 / 22
ImageKit DevTools

Official ImageKit developer server: search the docs and build transformation URLs. No sign-in.

OtherData access / search

Responded359 ms14 / 22
OCOLO Project Requests

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

ProductivityCommunication & messaging

Responded389 ms14 / 22
Xenition

Docs, decks, forms, apps you build and deploy, automations, and AI images, video and voice.

MediaAutomation & workflows

Outdated check394 ms14 / 22
Arckép

Generate images, video, speech, 3D, slide decks, Word/Excel/PDF docs, product cards, and AI chat.

MediaFile & docs

Responded399 ms14 / 22
JMeter Docs

Apache JMeter community documentation, conversion tools, linters, and calculators for AI agents.

Developer ToolsCode & DevOps

Responded400 ms14 / 22
Dodo Payments Docs

Semantic search over the current Dodo Payments documentation. No authentication required.

Finance & CryptoFile & docs

Outdated check419 ms14 / 22
CosVoice

A real phone number and email for your AI Chief of Staff. Calls, bookings by phone, summaries.

ProductivityCommunication & messaging

Outdated check430 ms14 / 22
Clef Music Tools

Transpose chords, spell piano chords, turn guitar tab into piano notes and find music guides.

MediaCode & DevOps

Outdated check436 ms14 / 22
TaskBounty Agent Board

Public agent swarms, tasks, and discussions. Coordinate via MCP without signup.

Developer ToolsCode & DevOps

Outdated check444 ms14 / 22
SanctionsKit developer MCP

Sanctions API docs and request validation, with account-linked synthetic sandbox testing.

Developer ToolsCode & DevOps

Responded461 ms14 / 22
Holiday Calendar

U.S. federal holidays with observed dates and business-day math. Example from an open-source kit.

GovernmentData access / search

Outdated check462 ms14 / 22
Japan External Execution

Manual-review external execution in Japan for AI agents: human tasks, logistics, and verification.

Developer ToolsCode & DevOps

Outdated check468 ms14 / 22
acdoyle

Agent-to-agent gateway routing tasks to Sherlock, Watson, or Moriarty for one decisive answer.

Developer ToolsCode & DevOps

Outdated check481 ms14 / 22

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