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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1052 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
X402 Git

Buy private git repos and agent skills with USDC over x402. Read the manifest free, then pay.

Finance & CryptoPayments & trading

Outdated check570 ms13 / 22
Exclusive Digits phone numbers

Search US local phone numbers for sale by city, area code, word, pattern or price.

OtherData access / search

Outdated check572 ms13 / 22
Postal Codes

Postal code lookup with place names and coordinates for 60+ countries. Via Zippopotam.us.

OtherData access / search

Outdated check574 ms13 / 22
Mode VC Chart: MCP Adoption: Model Context Protocol SDK Downloads

The MCP SDK had 52.3M npm downloads in the week of 24 Aug, 1.3× the OpenAI SDK and more than.

Developer ToolsCode & DevOps

Outdated check582 ms13 / 22
Mode VC Chart: Ollama Downloads: Is Local LLM Adoption Keeping Up?

On npm, Ollama's client fell from 27 to 6.6 downloads per 1,000 cloud lab SDK downloads in 46.

Developer ToolsCode & DevOps

Outdated check583 ms13 / 22
io.github.aurimasAPG/buildagents

Design AI agent teams for a business problem and generate ready-to-paste Claude Code prompts.

Developer ToolsCode & DevOps

Outdated check590 ms13 / 22
io.github.jdhart81/security-preflight

Static MCP, source-code and injection-indicator checks with redacted signed receipts.

Developer ToolsCode & DevOps

Responded594 ms13 / 22
Mode VC Chart: Vercel AI SDK Downloads vs. the Lab SDKs

The Vercel AI SDK fell from 31 to 23 weekly downloads per 100 downloads of the OpenAI,.

Developer ToolsAI / LLM tooling

Outdated check609 ms13 / 22
Vibe-Code Rescue

Read-only: matches an error from a Lovable, Bolt, v0, Cursor or Supabase app to a free fix guide.

OtherDatabase

Outdated check629 ms13 / 22
Circuit

Find and try paid AI agent skills for security, on-chain data, code, markets, research and news.

Finance & CryptoPayments & trading

Outdated check639 ms13 / 22
US Code Federal Statutes

Search and read U.S. Code statutes with legal and inline citations linking to uscode.ecfr.io.

LegalKnowledge & memory

Responded662 ms13 / 22
VisioForge SDK Assistant

VisioForge .NET SDK assistant: API reference, code examples and deployment guides.

Developer ToolsCode & DevOps

Outdated check677 ms13 / 22
Tenpace Review Router

Human-authenticated setup for routing GitHub pull requests into the right Slack channel.

Developer ToolsCommunication & messaging

Responded720 ms13 / 22
Is the internet OK?

Live internet status, security incidents, and dependency and GitHub repo checks. No key.

Developer ToolsCode & DevOps

Outdated check746 ms13 / 22
WIA Code & WIA Pin Code

Make shape-free 2D codes (WIA Code) and convert coordinates to and from WIA Pin Codes.

OtherOther

Outdated check768 ms13 / 22
WIA Braille + WIA Talk

Text to WIA Braille (pronunciation-based, not a national code), BRF output and checks, Nemeth math.

OtherOther

Outdated check774 ms13 / 22
io.github.kodandy/jp-crypto-tax-rules

Machine-readable Japanese crypto-asset tax rules for AI agents: rules-as-code with citations, x402.

Finance & CryptoCode & DevOps

Responded832 ms13 / 22
star365 HQ

Keyless web, GitHub, YouTube and Reddit search and read. Delegated shop, booking and signup.

MediaCode & DevOps

Outdated check884 ms13 / 22
MCP Morning

Daily MCP server rankings from public npm, PyPI, and GitHub data.

Developer ToolsCode & DevOps

Responded898 ms13 / 22
Marketing Skills Directory

Search, browse & read 340+ Claude Code marketing & SEO skills from any MCP client.

Marketing & SalesData access / search

Responded918 ms13 / 22
ScanPay — Code Security Oracle

Deterministic code security scan + tx preflight, paid in USDC via x402.

Finance & CryptoPayments & trading

Responded925 ms13 / 22
Mode VC Chart: Anthropic SDK vs. OpenAI SDK: npm Downloads

Anthropic's SDK went from 34% to 97% of the OpenAI SDK's weekly npm downloads in 46 weeks. It.

Developer ToolsAI / LLM tooling

Outdated check966 ms13 / 22
A.U.G.U.R Foresight · Web & Research

Read the web (page text, DNS, WHOIS, TLS, uptime) + research (Wikipedia, arXiv, GitHub, packages).

Developer ToolsKnowledge & memory

Outdated check1005 ms13 / 22
Linkbreakers Docs

Search and read Linkbreakers docs, pricing and QR code templates. Read-only, no auth.

Developer ToolsData access / search

Outdated check1060 ms13 / 22

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