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Public APIs MCP server

Which servers in the official MCP registry are Public APIs's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-16

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Whose server it is
  • Registry nameio.publicapis/directoryverified in the MCP registry

The registry name sits under publicapis.io. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-16
  • Stateanswerschecked 2026-10-16
  • Tools8
  • Server calls itselfpublicapis-io
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-16 the server answered initialize and tools/list without a sign-in. First answer in 840 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 4 of the 7 days it takes to judge reliability.

Once connected

  • Keep approval on for send_message: they delete, send or pay without saying so.
  • send_message change data without a sign-in: anyone with the address can call them.
  • Parameters are untyped or undescribed in 7 of 8 tools: check arguments before calling.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 4, the first on 2026-10-19
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 4 so far
  • Answeredmeasuring4 of the 7 daily checks it takes to print a share
  • Median first answer1869 ms
  • Space in an agent's context≈ 895 tokensthe definitions of all its tools (8), which an agent carries on every turn
  • Tool definitionsB · 81 of 100
  • Typed results0 of 8 toolsdeclared outputSchema: results come typed, read once
  • Parameters without a description: in 7 of 8
  • Not saying whether it only reads or can destroy: 2 of 8

Worth a look

  • Tools that delete, send or pay without telling the client so: send_message
  • Tools that change data, on a server that answers without a sign-in: send_message

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (30%), doing the product's job (25%), definitions (20%), context (10%) and use (15%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers8 tools · read 2026-10-16
  • search_apis

    Find a public API or data source for a task: use this whenever the user (or your code) needs an API, dataset or third-party service, e.g. weather, geocoding, payments, sports scores, crypto prices, jobs, LLMs. Searches 1,500+ APIs on…

  • get_api

    Everything about one API by slug (from search_apis): documentation summary, endpoints, auth, pricing and links. Use before writing integration code.

  • get_quickstart

    Ready-to-run example code for calling an API, in javascript, python or curl. Use when you are about to integrate an API into code. Verified samples are marked verified=true.

  • compare_apis

    Compare 2-5 APIs side by side (auth, free tier, HTTPS, pricing, docs summary) to choose one. Pass slugs from search_apis.

  • list_offerings

    Ways to get an API listed or sponsored on PublicAPIs.io, with fixed prices, current sponsorship availability and the rules.

  • start_deal

    Open a conversation with the PublicAPIs.io broker agent to list or sponsor an API. Say what you want in plain language and include the API name, website and a contact email if you have them. Returns deal_id and deal_key (keep both; they…

  • send_message

    Reply to the broker in an open deal. Returns the broker's answer and the deal status.

  • get_deal

    Status of a deal: negotiating, agreed, awaiting_approval, awaiting_payment (payment_url is included), publishing, live (live_url), rejected. Also returns the last messages.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "directory": {
      "type": "http",
      "url": "https://publicapis.io/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http publicapis https://publicapis.io/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://publicapis.io/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.