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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18288 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
Airbrake MCP by usefulapi

Read Airbrake projects, error groups, notices, deploys and stats; mute or unmute error groups.

Developer ToolsCode & DevOps

Responded375 ms15 / 22
Privi Quantum

Quantum on IonQ/IBM/Braket: spending mandates, signed benchmarks, paid PQC CBOM, advantage receipts.

Developer ToolsCode & DevOps

Outdated check379 ms15 / 22
Supplementscanner

Live supplement prices per kg, serving or capsule from stores across Europe. Free, no API key.

Developer ToolsCode & DevOps

Responded380 ms15 / 22
Proof Holdings

One API, all things verified — control, delegation, human approval, anti-impersonation.

Developer ToolsCode & DevOps

Outdated check380 ms15 / 22
California C-10 Contractor Check

Paid source-linked California electrical contractor license preflight.

Developer ToolsCode & DevOps

Outdated check384 ms15 / 22
Source Library

Search 15K rare pre-modern texts translated to English: philosophy, religion, science, literature.

Developer ToolsCode & DevOps

Outdated check384 ms15 / 22
Brontide agent arena

THE MECH ARENA BUILT FOR AI AGENTS. HUMANS WELCOME. Pilot mech duels over MCP, free, no sign-in.

Developer ToolsCode & DevOps

Responded385 ms15 / 22
Tolca

Know who you are paying before you pay: Québec contractor and company checks, plus web search. x402.

Developer ToolsData access / search

Responded387 ms15 / 22
Parlor.sh

Rooms where AI agents of any vendor talk to each other. A room is a URL. No sign-in.

Developer ToolsCode & DevOps

Responded391 ms15 / 22
Trengo MCP by usefulapi

Work tickets and messages, look up contacts and teams, pull reports, and reply, assign or close.

Developer ToolsData access / search

Responded392 ms15 / 22
Specularis AI Visibility Audit

Free AI visibility (GEO/AEO) audit: can ChatGPT, Claude and Perplexity find and cite your website?

Developer ToolsCode & DevOps

Outdated check392 ms15 / 22
Sounding

Sounding checks proposed decisions and returns structured proceed, revise, or pause assessments.

Developer ToolsCode & DevOps

Responded394 ms15 / 22
MotoGP (Race Results)

Live MotoGP, Moto2 and Moto3 standings, results, calendar, riders, live timing and news.

Developer ToolsCode & DevOps

Outdated check395 ms15 / 22
McpStamp Price Tracker

Read a shop page's current price, watch items with a target price and see each item's history.

Developer ToolsCode & DevOps

Responded397 ms15 / 22
freeq

Read and verify freeq conversations: channels, history, search, signatures, pins.

Developer ToolsCode & DevOps

Outdated check402 ms15 / 22
Seerxo

Generate SEO-optimized Etsy listings — title, description, and 13 tags — from your AI assistant.

Developer ToolsCode & DevOps

Responded406 ms15 / 22
Vibes-Coded Agent Tools

Web search, page-to-markdown, memory, leases and proof for agents. x402, no signup.

Developer ToolsData access / search

Outdated check406 ms15 / 22
Guitar Practice Routine App — Chord Charts

Look up a guitar chord by name and get a text chord diagram. 12,708 standard-tuning names.

Developer ToolsData access / search

Responded408 ms15 / 22
FactGrid (Renamed to FactReason)

Renamed to FactReason. Now published as io.github.factreason/factreason — please use that entry.

Developer ToolsCode & DevOps

Outdated check412 ms15 / 22
PromptGuard

Scan prompts for injection attacks, redact PII, and audit LLM SDK usage from any MCP client

Developer ToolsCode & DevOps

Outdated check412 ms15 / 22
BridgeDays

Plan annual leave around public holidays: bridge days and long weekends for 200+ countries.

Developer ToolsCode & DevOps

Outdated check413 ms15 / 22
AI Market - Real AI Agent Services & Buyer Demand

Find real AI services, signed buyer requests and voluntary purchase intents. Free MCP; no escrow.

Developer ToolsCode & DevOps

Outdated check413 ms15 / 22
PDF Text Extractor for AI Agents

x402 PDF text, pages, and metadata for AI/RAG. $0.0015 per successful PDF.

Developer ToolsCode & DevOps

Outdated check415 ms15 / 22
Online Poll Maker

Create poll drafts on onlinepollmaker.com. Free, no sign-up; you review and publish in the browser.

Developer ToolsCode & DevOps

Outdated check415 ms15 / 22

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