Developer alpha

Access Free Tools API and MCP

Access Free Tools now has an alpha tool execution layer for apps, agents, and LLM clients. It starts with 34 deterministic tools and returns answers with steps, assumptions, warnings, and links to the real website tools. If you want the human-facing version first, try Ask Access Free Tools; it uses the same deterministic runners behind the API and MCP endpoint.

REST API

Use JSON endpoints when building apps, automations, browser extensions, or normal server integrations.

GET /api/v1/tools
GET /api/v1/tools/percentage-calculator
POST /api/v1/run/percentage-calculator
POST /api/v1/ask
GET /api/openapi.json

MCP endpoint

Use the MCP endpoint when an LLM client supports remote Streamable HTTP MCP servers.

https://accessfreetools.com/mcp

The MCP server exposes search_tools, get_tool_schema, run_tool, and fetch_tool_guide.

Run a tool

Every result cites the tool and guide URL so people can double-check the answer on the site. For example, electrical questions can call theWatts to Amps Calculatorinstead of asking a model to guess the math.

POST /api/v1/run/percentage-calculator
{
  "inputs": {
    "mode": "percent-of",
    "percent": 18,
    "value": 240
  }
}

Trust rules

Finance, health, construction, electrical, privacy, and sensitive tools return warnings. Access Free Tools should be used for estimates and learning, not as professional approval.