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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5037 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/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Outdated check926 ms14 / 22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Outdated check934 ms14 / 22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Outdated check934 ms14 / 22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Outdated check934 ms14 / 22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Outdated check935 ms14 / 22
io.github.cyanheads/openlibrary-mcp-server

Search books and authors, fetch editions, browse subjects, and resolve cover images.

MediaCode & DevOps

Outdated check937 ms14 / 22
Neural Cosmology

Answers, essays, experiments and books on consciousness and cosmology: search, read, buy.

OtherData access / search

Responded940 ms14 / 22
fipeX MCP

Brazilian FIPE vehicle reference prices: search, current price, history and comparison. Keyless.

OtherData access / search

Outdated check940 ms14 / 22
io.github.cyanheads/zenodo-mcp-server

Search and resolve Zenodo datasets, software, and publications by DOI; trace versions and funding.

Developer ToolsCode & DevOps

Outdated check944 ms14 / 22
cern-inspire-mcp-server

Search INSPIRE-HEP papers, authors, experiments, HEPData records; get citation metrics and BibTeX.

Developer ToolsCode & DevOps

Outdated check944 ms14 / 22
geonames-mcp-server

Search GeoNames places, walk admin hierarchies, reverse geocode, get postal codes and country info.

Developer ToolsCode & DevOps

Outdated check948 ms14 / 22
Kopp Real Estate München

Munich real estate: market prices by district, current listings, free valuation and search requests.

Real Estate & PropertyData access / search

Responded949 ms14 / 22
io.github.cyanheads/art-institute-chicago-mcp-server

Search the Art Institute of Chicago collection: artworks, artists, exhibitions, and audio guides.

MediaCode & DevOps

Outdated check953 ms14 / 22
Pakki Packaging Brand Directory

Search source-backed U.S. flexible packaging brand directories. Free, read-only, no API key.

OtherData access / search

Responded962 ms14 / 22
io.github.cyanheads/browser-compat-mcp-server

Browser compatibility and Baseline status for any web feature — offline, from bundled MDN data.

Developer ToolsCode & DevOps

Outdated check963 ms14 / 22
io.github.cyanheads/usda-mcp-server

Search foods, compare nutrients, and look up the full USDA FoodData Central database.

Developer ToolsData access / search

Outdated check971 ms14 / 22
Realmint

Agent-native scoring, search and routing for tokenized real-world assets across multi-chain.

Developer ToolsCode & DevOps

Responded975 ms14 / 22
chat.avva/catalog

Search Avva for an expert, then connect their model - judgment from real past decisions.

OtherData access / search

Responded980 ms14 / 22
io.github.cyanheads/pubchem-mcp-server

Search PubChem compounds, properties, safety data, bioactivity, and cross-references.

Developer ToolsCode & DevOps

Outdated check999 ms14 / 22
saaskr — Korean SaaS Directory (한국 SaaS 디렉토리)

Korean SaaS directory: search 3,700+ services, find Korean API/MCP tools and AI API providers.

Developer ToolsData access / search

Responded1001 ms14 / 22
SPACEXPLORATION

Search commercial real estate listings. Reads need no token; authoring is self-serve OAuth (DCR).

Real Estate & PropertyData access / search

Responded1002 ms14 / 22
io.github.worklore/worklore

Search worklore stories and x-ray any skill or story capability tier (T0-T4) before you run it.

Developer ToolsCode & DevOps

Outdated check1003 ms14 / 22
io.github.cyanheads/noaa-climate-mcp-server

Search NOAA climate stations and datasets, fetch historical weather observations.

Data & AnalyticsCode & DevOps

Outdated check1007 ms14 / 22
io.github.cyanheads/reliefweb-mcp-server

Search ReliefWeb humanitarian reports, disasters, jobs, training, and country profiles via MCP.

Developer ToolsCode & DevOps

Outdated check1008 ms14 / 22

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