DMS Apex MCP server

Our dealer calculators, callable from Claude, ChatGPT and any AI assistant that supports the Model Context Protocol. Ask a deal-math question and the assistant runs the real calculation.

Endpoint

https://dmsapex.com/api/mcp (stateless JSON-RPC 2.0 over HTTP).

Tools

Tool	What it does
dealer_sales_tax	Sales tax on a used-car sale in any state or DC, with trade-in, dealer fee, service contract and local tax
out_the_door_price	Price plus fees and tax, less trade-in and down payment
profit_margin	Profit, margin and markup after all costs
inventory_turn	Turn rate and average days to sell
holding_cost	Cost of holding a car on the lot
floor_plan_interest	Floor plan interest and fees on one car

Connect it

Add it as an HTTP MCP server in any client that supports remote MCP servers. For a config-file client such as Claude Desktop:

{
  "mcpServers": {
    "dms-apex": {
      "type": "http",
      "url": "https://dmsapex.com/api/mcp"
    }
  }
}

Common questions

Does it cost anything or need an API key?

No. It is free, with no key, account or sign-up.

Does it see my dealership's data?

No. It works only with the numbers the assistant sends in each call, stores nothing, and has no access to any DMS Apex account.

Which tax rules does it use?

The same state rules DMS Apex uses on the sale screen, for all 50 states and DC. Results are estimates: confirm with your state.

Run your lot, deals and paperwork in one place

DMS Apex is $28 a month with a 15-day free trial. It prints your state's forms and works out your state's tax.

Start your 15-day free trial