PublicAPIs.io

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

Search 1,500+ public APIs with docs, code and auth/free-tier filters; list or sponsor your API.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "PublicAPIs.io": {
      "url": "https://publicapis.io/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (8)

• search_apis read-only

  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 PublicAPIs.io and returns name, description, category, link and signals (auth: none/api_key/oauth, free_tier, https). Filter with auth="none" for APIs that need no key, free=true, https=true.

  Parameters:

  • auth — string — Only APIs with this authentication. "none" = no key needed.
  • free — boolean — Only APIs with a free tier.
  • https — boolean — Only APIs served over HTTPS.
  • limit — integer
  • query — string — What the API should do, in plain words.
  • category — string — Optional category name or id, e.g. "Weather", "finance".

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• get_api read-only

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

  Parameters:

  • slug (required) — string

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• get_quickstart read-only

  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.

  Parameters:

  • slug (required) — string
  • language — string

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• compare_apis read-only

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

  Parameters:

  • slugs (required) — array

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• list_offerings read-only

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

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

• 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 are needed to continue) and the broker's reply. Every deal is approved by a person before payment.

  Parameters:

  • message (required) — string
  • contact_email (required) — string — Where approval, payment link and go-live emails are sent.
  • company — string
  • website — string
  • api_name — string
  • contact_name — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• send_message

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

  Parameters:

  • deal_id (required) — string
  • deal_key (required) — string
  • message (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• get_deal read-only

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

  Parameters:

  • deal_id (required) — string
  • deal_key (required) — string

  Hints: read-only yes · destructive not declared · idempotent not declared · open-world not declared

Publisher website

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.