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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40680 servers

Ordered by checks passed
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
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
Scento Perfume API (MCP server)

Scento perfume API and MCP server: notes, families, similar scents for 1,600+ perfumes. No key.

ProductivityFile & docs

Outdated check408 ms15 / 22
Pondchat

Ephemeral P2P WebRTC video rooms — create a pond, share the link, talk.

MediaAI / LLM tooling

Outdated check410 ms15 / 22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Outdated check412 ms15 / 22
Leonida Lab: GTA 6 facts, official or not

Unofficial GTA 6 facts tagged official or reported. Not affiliated with Rockstar Games or Take-Two.

OtherOther

Outdated check412 ms15 / 22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Outdated check412 ms15 / 22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Outdated check413 ms15 / 22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Outdated check413 ms15 / 22
SkyAccess

Search 5,000+ live empty leg flights, get charter estimates and booking links. Free, no API key.

TravelData access / search

Outdated check413 ms15 / 22
Crosswire — Polymarket & Kalshi Arbitrage

Cross-venue Polymarket+Kalshi arbitrage: resolution mismatch, void risk & settlement divergence.

OtherOther

Outdated check413 ms15 / 22
AgentsCPA

Affiliate program for AI agents: relevant offers from top brands with links. Earn per purchase.

Marketing & SalesData access / search

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

Responded415 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
Verse by A-to-Mind

Ask Verse anything with sources, plus code review, translation and more paid per call over x402.

Developer ToolsCode & DevOps

Outdated check417 ms15 / 22
Symvanta

Hosted code graph over MCP: exact callers, dependencies, and cross-repo blast radius for AI agents.

Developer ToolsCode & DevOps

Outdated check418 ms15 / 22
WebinarIgnition

Webinar leads and revenue from several WordPress sites, in one chat.

Marketing & SalesData access / search

Outdated check419 ms15 / 22
Telesherpa Ontology Platform

Ontology platform for field service: AI agents observe, connect and act on business objects.

Developer ToolsCode & DevOps

Outdated check420 ms15 / 22
Scigantic

Search public scientific datasets and read schema cards that describe their files, columns and rows

Data & AnalyticsData access / search

Outdated check421 ms15 / 22
Trooth

Read any company's record on the Trooth Network, each fact labeled with who said it and when.

Developer ToolsCode & DevOps

Responded425 ms15 / 22
Spin Wheel Names

Spin a random picker wheel, pick a random number, and search shared wheels from spinwheelnames.com.

Developer ToolsCode & DevOps

Outdated check427 ms15 / 22
JW3 MCP Server

JW3.ai remote MCP server for market reads and confirm-gated trading execution.

Developer ToolsCode & DevOps

Outdated check427 ms15 / 22
MiniURL

OAuth 2.1 short-link tools for AI agents with scoped tokens, approvals, audit logs, and revocation.

Developer ToolsCode & DevOps

Outdated check427 ms15 / 22
Laplace’s Mini World

Interactive 3D science models in Chinese and English, found and shown live in the chat.

Developer ToolsCode & DevOps

Outdated check428 ms15 / 22
Ireland MCP

Read-only Irish public data for AI assistants: stats, weather, transport, law, property and maps.

Developer ToolsCode & DevOps

Outdated check428 ms15 / 22

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