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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5038 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
io.github.cyanheads/hn-mcp-server

Browse Hacker News feeds, threads, and user profiles with full-text search.

Developer ToolsCode & DevOps

Outdated check880 ms14 / 22
Diver Atlas

Read-only dive-site atlas: search sites, sourced site plates, conditions, suitability checks.

OtherData access / search

Outdated check887 ms14 / 22
io.github.cyanheads/oecd-mcp-server

Search and query 1,500+ OECD statistical datasets via SDMX. Keyless.

Developer ToolsCode & DevOps

Outdated check887 ms14 / 22
io.github.cyanheads/cyanheads-mcp-server

Fleet discovery for the cyanheads MCP ecosystem — semantic search + install snippets.

Developer ToolsCode & DevOps

Outdated check887 ms14 / 22
RentReboot Apartment Search

NYC rent data and guides; OAuth tools for apartment alerts, saved searches and lottery status.

Developer ToolsCode & DevOps

Outdated check889 ms14 / 22
io.github.cyanheads/met-museum-mcp-server

Search the Met collection, browse by department or update date, fetch full records and CC0 images.

MediaCode & DevOps

Outdated check890 ms14 / 22
io.github.cyanheads/internet-archive-mcp-server

Search the Wayback Machine and IA library (40M+ items), fetch snapshots, item metadata, and text.

Developer ToolsCode & DevOps

Outdated check891 ms14 / 22
Jacob Campbell — Florida Real Estate (The Keyes Company)

Read-only server for jacobcampbellrealtor.com: licensee, service area, referrals, site search.

Real Estate & PropertyData access / search

Responded903 ms14 / 22
io.github.cyanheads/earthquake-mcp-server

Search USGS and EMSC seismic data — real-time feeds, event queries, and earthquake counts.

Developer ToolsCode & DevOps

Outdated check903 ms14 / 22
io.github.cyanheads/uk-legislation-mcp-server

Search and read UK legislation at any date, resolve citations, list amendments, track changes.

LegalCode & DevOps

Outdated check904 ms14 / 22
io.github.cyanheads/oeis-mcp-server

Identify integer sequences by terms, search the OEIS, read formulas, programs, b-files, cross-refs.

Developer ToolsCode & DevOps

Outdated check906 ms14 / 22
io.github.cyanheads/libofcongress-mcp-server

Search LOC digital collections, Chronicling America newspapers (full OCR), and LC Subject Headings.

Developer ToolsCode & DevOps

Outdated check908 ms14 / 22
Knowra

Search arXiv papers and read Scout reports with methods, evidence and verification points.

OtherKnowledge & memory

Responded910 ms14 / 22
Employment Lawyers Group

California employee-side employment law firm: offices, page search, consultation requests.

LegalData access / search

Responded911 ms14 / 22
io.github.cyanheads/uk-police-crime-mcp-server

Search UK street crime, outcomes, stop and search, and neighbourhood teams (Scotland: BTP only).

Developer ToolsCode & DevOps

Outdated check912 ms14 / 22
io.github.cyanheads/biorxiv-mcp-server

Search and retrieve bioRxiv and medRxiv preprints — by DOI, date interval, or keyword — via MCP.

Developer ToolsCode & DevOps

Outdated check913 ms14 / 22
io.github.cyanheads/faa-aircraft-registry-mcp-server

Offline, keyless lookup of the US civil aircraft registry — decode N-numbers, search records.

Developer ToolsData access / search

Outdated check918 ms14 / 22
io.github.cyanheads/nist-nvd-mcp-server

Search and audit NIST NVD CVEs by keyword, severity, CWE, CISA KEV status, and CPE.

Developer ToolsCode & DevOps

Outdated check919 ms14 / 22
io.github.cyanheads/smithsonian-mcp-server

Search 14.5M Smithsonian Open Access objects, get CC0 images, find cross-collection connections.

MediaCode & DevOps

Outdated check920 ms14 / 22
io.github.cyanheads/nhtsa-vehicle-safety-mcp-server

Decode VINs, search recalls, complaints, crash ratings, and investigations.

Developer ToolsCode & DevOps

Outdated check926 ms14 / 22
io.github.cyanheads/npi-providers-mcp-server

Search NPPES providers and resolve NUCC specialty codes via MCP over STDIO or Streamable HTTP.

Developer ToolsCode & DevOps

Outdated check934 ms14 / 22
io.github.cyanheads/datacite-mcp-server

Search DataCite datasets and software, fetch DOI metadata, trace relations, format citations.

Developer ToolsCode & DevOps

Outdated check934 ms14 / 22
fcc-spectrum-mcp-server

Search FCC radio licenses, find nearby licensed sites, and see who is licensed on a frequency.

MediaCode & DevOps

Outdated check934 ms14 / 22
io.github.cyanheads/crossref-mcp-server

Resolve DOIs, search ~188M scholarly works, and fetch references via the Crossref REST API.

Developer ToolsCode & DevOps

Outdated check935 ms14 / 22

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