MCP servers for Claude Code

iNaturalist MCP — citizen-science species observations (free, no auth for read-only)

KNMI Data Platform (Open Data API) MCP.

Lorem MCP — placeholder text, generated locally.

MAST MCP — Space Telescopes archive.

mempool.space MCP — Bitcoin block explorer + mempool/fee stats

MIME type lookup MCP.

NASA MCP — wraps NASA Open APIs (api.nasa.gov)

Narodowy Bank Polski (National Bank of Poland) Web API MCP. Keyless.

Number utilities MCP.

PayPal MCP Pack — read-only access to PayPal transactions, orders, invoices, and disputes.

PredictHQ MCP — wraps the PredictHQ Events API (predicthq.com)

PyPI MCP — wraps the Python Package Index (PyPI) JSON API (free, no auth).

Roblox MCP.

SEC 8-K event triage — query pre-classified 8-K filings from the last 30+ days, severity-ranked.

SEC XBRL MCP — wraps SEC EDGAR XBRL API (data.sec.gov)

US Senate Lobbying Disclosure (LDA) MCP.

SEO SERP MCP — Google organic search results via DataForSEO (dataforseo.com)

SIMBAD MCP — CDS astronomical object database.

Smithsonian Open Access MCP.

Spoonacular MCP.

Statistics Norway (SSB) PxWebApi MCP.