JSONPlaceholder MCP — wraps JSONPlaceholder fake REST API (free, no auth)
Free
1,838 MCP servers
Works with OpenAI Agents SDKBy pipeworx-io
Kalshi MCP — US-regulated prediction-market data (no auth on public reads).
Free
KEGG REST MCP — Kyoto Encyclopedia of Genes and Genomes.
Free
Klaviyo MCP Pack — wraps the Klaviyo API for email marketing
Free
Land Price Japan MCP — official Japanese land prices (地価公示 / 地価調査)
Free
Last.fm MCP.
Free
LatAm Validate MCP — validate Latin-American banking and tax identifiers.
Free
LaunchDarkly MCP Pack — wraps the LaunchDarkly REST API v2
Free
Lens.org MCP — patent + scholarly platform.
Free
Library of Congress (loc.gov) MCP — the world's largest library.
Free
LibriVox MCP.
Free
Lichess MCP — public read-only API for users, games, explorer, tablebase.
Free
LinkedIn Ads MCP Pack
Free
Lob MCP — US address verification, bulk verification, and autocompletion
Free
Lyrics OVH MCP — keyless lyrics lookup.
Free
macro-snapshot MCP — the state of the economy in one call.
Free
Mailchimp MCP Pack — manage audiences, campaigns, and members via Mailchimp Marketing API.
Free
Manifold Markets MCP.
Free
Mapbox MCP.
Free
Market Recap MCP — a one-call 'what happened in markets' snapshot.
Free
market-spread MCP — cross-venue prediction-market landscape scanner.
Free