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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2930 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
Align

Ask what your team decided in meetings, get your standup, and update Jira/Linear-synced tasks.

ProductivityFile & docs

Requires authOutdated checkNot measured5 / 22
Anneal

Zero-friction personal operating system: habits, tasks, and FSRS-5 study retention via remote MCP.

Developer ToolsCode & DevOps

Requires authOutdated checkNot measured5 / 22
anon.li

Manage anon.li email aliases, recipients and encrypted file drop metadata over OAuth.

Developer ToolsCommunication & messaging

Requires authOutdated checkNot measured5 / 22
aNotepad

AI access to your aNotepad online notes: read, search, write, and organize via 22 tools.

ProductivityData access / search

Requires authOutdated checkNot measured5 / 22
Anymail

Cold email outreach: manage prospects, campaigns, replies and webhooks in Anymail.

Marketing & SalesCommunication & messaging

Requires authOutdated checkNot measured5 / 22
Anymail Finder

Find and verify work emails by name, company, role or LinkedIn URL, and find who is behind an email.

Developer ToolsCommunication & messaging

Requires authOutdated checkNot measured5 / 22
API operation

Read one operation from a public OpenAPI document: method, path, and required fields.

Developer ToolsCode & DevOps

Requires authNot measured5 / 22Not checked yet
APICK

APICK Korean data, simple-auth lookups, document forms, OCR, search, image, video and TTS

MediaData access / search

Requires authNot measured5 / 22Not checked yet
APICK Convert

Document editing, AI writing, saved documents, DOCX downloads, PDF, STT, TTS and watermarking

MediaFile & docs

Requires authNot measured5 / 22Not checked yet
APICK Identity

Korean ID document verification and PII masking APIs

OtherFile & docs

Requires authNot measured5 / 22Not checked yet
APICK Subagent

Document inventory, extraction, summaries and comparison with source quotes and usage billing.

Finance & CryptoPayments & trading

Requires authNot measured5 / 22Not checked yet
Apify Content for RAG

Fresh RSS/Atom items, published podcast transcripts and public PDF text via Apify.

MediaCode & DevOps

Requires authNot measured5 / 22Not checked yet
App-Kit

SEO audit (400 checks), text readability and grammar check, PDF to images, image conversion.

MediaCode & DevOps

Requires authNot measured5 / 22Not checked yet
Apricot

Manage SysML2 projects; check, evaluate, verify, query, document and diagram models.

OtherFile & docs

Requires authNot measured5 / 22
Arbitron

Crypto perp funding, spreads and listings, plus your own Arbitron cards, trades, PnL and docs.

Finance & CryptoPayments & trading

Requires authOutdated checkNot measured5 / 22
Arc UI

React components and blocks with motion. Search docs, props and shadcn install commands.

OtherData access / search

Requires authNot measured5 / 22Not checked yet
Argentine e-invoices (ARCA/AFIP) to validated JSON

Reads Argentine ARCA/AFIP invoices from PDF or image, decodes the QR and returns validated JSON.

Finance & CryptoPayments & trading

Requires authNot measured5 / 22Not checked yet
Argorant

Find B2B leads, check every email, write and send campaigns and sort replies from your own AI.

Marketing & SalesCommunication & messaging

Requires authOutdated checkNot measured5 / 22
Arkova Verification

Privacy-first document verification anchored to the public ledger.

Finance & CryptoFile & docs

Requires authNot measured5 / 22Not checked yet
ArtifactGuard Signed AI Deliverable QA

Signed PASS/WARN/FAIL QA receipts for AI-generated JSON, ZIP, PDF, and DOCX deliverables.

Developer ToolsFile & docs

Requires authNot measured5 / 22Not checked yet
ArtifactSend

Share docs, decks, HTML and Claude artifacts as tracked links and data rooms. See who read them.

Developer ToolsAI / LLM tooling

Requires authOutdated checkNot measured5 / 22
ArtifactSmith

Turns agent output into versioned web pages, PDFs, Word docs, spreadsheets and Markdown.

ProductivityFile & docs

Requires authNot measured5 / 22Not checked yet
Artil — Email, SMS & Messaging for AI Agents

Give AI agents own email inbox, SMS numbers, and workspace accounts to receive and send messages.

ProductivityCommunication & messaging

Requires authNot measured5 / 22
Assay

Hand a task to another person's AI agent, or take paid tasks. Paid only when the work passes.

Developer ToolsCode & DevOps

Requires authNot measured5 / 22

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