Turn ARMS Automotive into an API

What you can build on ARMS Automotive

• Get the Vehicle List

  Build this

  Reads the Vehicle List page you land on after signing in: the renters whose vehicles are under repair at your shop.

  Takes

  Nothing

  Returns

  Renter's name, number of renters

• Read a renter's Vehicle Detail

  Build this

  Opens one renter from the Vehicle List and reads the vehicle status data on the Vehicle Detail page: the repair status and labor hours.

  Takes

  Renter's name

  Returns

  Renter's name, repair status, labor hours

• Get the open and closed rentals report

  Build this

  Reads the shop reporting in ARMS Automotive: your open and closed rentals and your average rental length compared with the market.

  Takes

  Nothing

  Returns

  Open rentals, closed rentals, average rental length, market average rental length

• Update a renter's repair status

  Build this

  Opens a renter's Vehicle Detail page and updates the repair status and labor hours, which go to Enterprise and on to the insurance company.

  Takes

  Renter's name, repair status, labor hours

  Returns

  Renter's name, repair status, labor hours, saved at

Automate ARMS Automotive with a workflow

A workflow runs your methods as one process, with nobody at the screen. A schedule or a call from your own system starts it, the steps run in order, and the result arrives in your inbox or in the systems you already use.

• Renters whose repair status has not been updated

  Build this

  Starts

  Every weekday at 7:30

  Step 1

  Get the Vehicle List from ARMS Automotive.

  Step 2

  For each renter, read the repair status and labor hours on the Vehicle Detail page.

  Step 3

  Keep the renters whose repair status and labor hours have not changed since the last run.

  Step 4

  Email you the list with renter's name, repair status and labor hours.

• Weekly rental length report

  Build this

  Starts

  Every Monday at 8:00

  Step 1

  Get the open and closed rentals report.

  Step 2

  Compare your average rental length with the market's and with last week's run.

  Step 3

  Email you a short summary with the open and closed counts.

• Repair status from your shop system

  Build this

  Starts

  When your system calls the workflow's webhook with a renter's name and repair status

  Step 1

  Update the repair status and labor hours on that renter's Vehicle Detail page.

  Step 2

  Read the Vehicle Detail page back to confirm what was saved.

  Step 3

  Post renter's name, repair status and labor hours to your shop system's webhook.

You can run a workflow by hand on every plan, Free included. Schedules and webhook triggers come with the paid plans, from $29 a month.

Once built, one call from your code

Once you have built a method, it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Get the Vehicle List” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "www.armsauto.com/get_vehicle_list",
    "input": {}
  }'

{
  "status": "completed",
  "data": {
    "vehicles": [
      {
        "renter_name": "Dana Acme"
      },
      {
        "renter_name": "Lee Northwind"
      },
      {
        "renter_name": "Sam Globex"
      }
    ],
    "count": 3
  }
}

An example with invented data, not a ready-made endpoint. The method exists in your organization once you build it, and its name, inputs and fields follow your request.

ARMS Automotive’s own options

Enterprise lists Replacement Rental APIs on its developer site for insurance, collision repair and fleet partners: messages with the rental branch, the rental from authorization to payment, and rental data. Access is requested through your Enterprise account manager, and no public specification is shown. Shops otherwise update repair status in ARMS Automotive itself.

Read on November 12, 2026: Enterprise developer site: Replacement Rental, ARMS Automotive FAQ.

Signing in to ARMS Automotive

ARMS Automotive signs you in with the User ID and password you chose at enrollment, and you enter them every time you open the system. No second step is documented. With Fous you sign in once through ARMS Automotive's own sign-in with your own account: the login is sealed with AES-256, and an expired session is signed back in.

Worth knowing

Enrollment goes through an Enterprise branch

You start with Online Enrollment, but an Enterprise representative has to help you finish it. The FAQ says to call 1 800 Rent A Car and ask for the Branch or Assistant Branch Manager.

Your status updates reach the insurer

Repair status and labor hour updates you make in ARMS Automotive go to Enterprise, which passes them on to the insurance company.

Your shop system may already send the date

ARMS Automotive Exchange can work with a shop's management system to send estimated completion dates and status details to Enterprise. Check with your management system provider before you build an update method.

Reservations go to the branch

Create Reservation on the Vehicle List sends the request to the Enterprise branch, which contacts the customer when it needs more information. Rate questions go to your local branch.

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