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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2908 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
Agent Provider Depot

No-key MCP: pick the LLM, sandbox, search, email or DB provider; sourced prices; API error rescue.

ProductivityCommunication & messaging

Responded453 ms13 / 22
HideMail

Private email aliases that forward to your inbox: create, find, edit and turn aliases off or on.

ProductivityCommunication & messaging

Responded454 ms13 / 22
Youanai Docs

Search and read public youanai.com pages on pricing, products and guides. No sign-in needed.

OtherData access / search

Outdated check459 ms13 / 22
Couryo free email tools

Free, no login: verify an email address, check SPF/DKIM/DMARC, explain SMTP errors, build SPF/DMARC.

ProductivityCommunication & messaging

Responded463 ms13 / 22
JSONPad documentation

JSONPad docs, API, SDK and CLI references, and offline checkers for write rules and flows.

Developer ToolsFile & docs

Outdated check463 ms13 / 22
Juno Open Health Tools

Consent-gated tools that turn user health notes into non-diagnostic appointment-prep materials.

Developer ToolsCode & DevOps

Outdated check465 ms13 / 22
Bottled

Branded email on your own domain: send, reply, search, aliases, contacts and campaigns.

Marketing & SalesCommunication & messaging

Outdated check467 ms13 / 22
download.fan

Links to free video downloaders, converters, PDF tools, calculators and official app downloads.

MediaFile & docs

Outdated check469 ms13 / 22
io.github.zkarimi22/agentaddress

Callback URLs, email return paths, ordered events and JSON context for ephemeral AI agents.

Developer ToolsCommunication & messaging

Responded473 ms13 / 22
Cadastro Ambiental Rural: Demonstrativo (PDF)

Cadastro Ambiental Rural: Demonstrativo (PDF), official-source lookup. Platform-hosted, pay per quer

Developer ToolsCode & DevOps

Outdated check478 ms13 / 22
ar.com.muovi/mcp-server

MCP server for Muovi, Argentina's trust-first local services marketplace: find pros, draft tasks.

Developer ToolsCode & DevOps

Outdated check479 ms13 / 22
DeepSearch

Research a person's public footprint from a name, phone, email, or username. Sourced.

ProductivityCommunication & messaging

Responded486 ms13 / 22
StartupHub.ai

Funding rounds, AI startup and investor search, email discovery, agent-readiness. No API key.

ProductivityCommunication & messaging

Responded488 ms13 / 22
tech.interpretai/PostAgent

Print & mail PDF/HTML/Markdown/text/DOCX/images to US addresses; pay per call in x402 USDC on Base.

Finance & CryptoFile & docs

Responded490 ms13 / 22
com.apple-rag/mcp-server

Apple developer docs and WWDC transcripts with RAG retrieval and Jev relevance ranking.

Developer ToolsAI / LLM tooling

Outdated check494 ms13 / 22
BeingSo Animated Cards

Search, personalize, publish, share, and email animated greeting cards from BeingSo.

ProductivityCommunication & messaging

Responded506 ms13 / 22
Vector Panda Documentation

Search and read Vector Panda docs: API operations, pricing, storage tiers, measured benchmarks.

OtherFile & docs

Outdated check514 ms13 / 22
MintPDF

Turn HTML or Markdown into a clean, styled PDF and get a download link.

Developer ToolsFile & docs

Outdated check517 ms13 / 22
MarketCheck API Docs

MarketCheck API docs for coding assistants: search, endpoint reference, plans. Free, no auth.

Developer ToolsData access / search

Responded524 ms13 / 22
io.github.wilmendezofficial/postari

Email marketing y transaccional AI-native: campañas, correos 1-a-1, contactos, flujos y métricas.

Marketing & SalesCommunication & messaging

Responded529 ms13 / 22
SpamFixer Email Deliverability Check

Why do a domain's emails go to spam? Checks SPF, DKIM, DMARC, MX and blocklists. Free, no login.

ProductivityCommunication & messaging

Responded530 ms13 / 22
NetSendo website

NetSendo facts, plans, releases, docs and blog; release alerts after OAuth sign-in.

OtherOther

Responded541 ms13 / 22
io.github.Bluecraft-AI/machfive

Generate hyper-personalized cold email sequences via MachFive API.

Developer ToolsCommunication & messaging

Outdated check547 ms13 / 22
b612 (hakuto AI)

Design-review copilot: industry design checkpoints, edge cases, and Japanese legal notes.

LegalAI / LLM tooling

Responded559 ms13 / 22

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