reference-data-mcp-server
If you need reference data inside an agent loop and don't want to wire up three different APIs, this server covers countries, IANA timezones, periodic table elements, CODATA 2022 physical constants, unit conversion, HTTP status codes, and MIME types. The ten tools include geo lookup and search, timezone lookup and local-datetime conversion across DST boundaries, element lookup and filtered search, a fuzzy constant lookup that resolves aliases like "Avogadro's number" or "k_B", and a unit converter. Everything runs offline with no API keys or rate limits. It speaks STDIO or Streamable HTTP, and there's a public hosted instance if you just want to point a client at it. I'd reach for it when a model needs to resolve "Brasil" to a country record, or convert a meeting time between zones without hallucinating the offset.
- tools
- 10
- transport
- HTTP
- last updated
- Jul 10, 2026
Tools
10 toolsPublic tool metadata for what this MCP can expose to an agent.
ref_geo_lookupLook up a country by name, ISO alpha-2, or alpha-3 code.
Look up a country by name, ISO alpha-2, or alpha-3 code.
No parameter schema in public metadata yet.
ref_geo_searchSearch and filter countries by region, subregion, language, or currency.
Search and filter countries by region, subregion, language, or currency.
No parameter schema in public metadata yet.
ref_timezone_lookupGet timezone info by IANA ID, country code, or city name.
Get timezone info by IANA ID, country code, or city name.
No parameter schema in public metadata yet.
ref_timezone_convertConvert a local datetime from one timezone to another.
Convert a local datetime from one timezone to another.
No parameter schema in public metadata yet.
ref_element_lookupLook up a periodic table element by name, symbol, or atomic number.
Look up a periodic table element by name, symbol, or atomic number.
No parameter schema in public metadata yet.
ref_element_searchFilter periodic table elements by category, group, period, or property range.
Filter periodic table elements by category, group, period, or property range.
No parameter schema in public metadata yet.
ref_constant_lookupLook up a CODATA 2022 physical constant by name, symbol, or alias.
Look up a CODATA 2022 physical constant by name, symbol, or alias.
No parameter schema in public metadata yet.
ref_unit_convertConvert a numeric value between compatible units of measure.
Convert a numeric value between compatible units of measure.
No parameter schema in public metadata yet.
ref_http_statusLook up an HTTP status code by number or keyword.
Look up an HTTP status code by number or keyword.
No parameter schema in public metadata yet.
ref_mime_typeLook up a MIME type by type string or file extension.
Look up a MIME type by type string or file extension.
No parameter schema in public metadata yet.
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@cyanheads/reference-data-mcp-server
Look up countries, timezones, periodic table elements, physical constants, units, HTTP status codes, and MIME types via MCP. STDIO or Streamable HTTP.
Details
- Repository
- github.com/cyanheads/reference-data-mcp-server
- Website
- reference-data.caseyjhand.com/mcp
- Category
- Data & Analytics
- Transport
- HTTP
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