Access Free Tools API and MCP

1. Discover tools

List every callable runner, then open one schema before building the request body.

GET /api/v1/tools
GET /api/v1/tools/percentage-calculator
GET /api/openapi.json

Browse the live tool registry or open the OpenAPI document.

2. Run deterministic code

Send inputs that match the selected tool schema. This browser example returns 43.2.

const response = await fetch(
  "https://accessfreetools.com/api/v1/run/percentage-calculator",
  {
    method: "POST",
    headers: { "content-type": "application/json" },
    body: JSON.stringify({
      inputs: { mode: "percent-of", percent: 18, value: 240 }
    })
  }
);

const data = await response.json();

3. Check the response

A successful run returns the normalized inputs, answer, result object, steps, assumptions, and warnings. It also links to the matching tool and guide.

{
  "ok": true,
  "run": {
    "answer": "18% of 240 is 43.2.",
    "steps": [
      "18 / 100 = 0.18",
      "0.18 x 240 = 43.2"
    ],
    "warnings": [],
    "tool_url": "https://accessfreetools.com/tools/percentage-calculator/"
  }
}

4. Connect through MCP

Choose a remote Streamable HTTP connection in a compatible MCP client and use this endpoint:

https://accessfreetools.com/mcp

The server exposes search_tools, get_tool_schema, run_tool, and fetch_tool_guide. It does not keep an MCP session between requests.