Pull your Fastenal account into your own systems

What you can build on Fastenal

• Get open balances

  Build this

  Reads Open Balances and Statements for one Customer ID: the account balance, the summary by time frame and each outstanding invoice.

  Takes

  Customer ID

  Returns

  Account balance, balance by time frame, number of invoices with a balance, invoice number, invoice date, open amount

• Get order history

  Build this

  Reads Order History: each order's current state, parts, quantities, shipping information and delivery details.

  Takes

  Placed since (optional)

  Returns

  Order number, current state, parts, quantities, shipping information, delivery details

• Check your price and availability

  Build this

  Opens a part's product page while signed in and reads your account's price, the availability message and whether it is an Express item.

  Takes

  SKUs

  Returns

  SKU, description, your price, availability message, Express

• Approve an eQuote

  Build this

  Opens a quote on the eQuotes page, adds it to the cart, checks out with your PO number in Special Instructions and submits the order.

  Takes

  Quote number, PO number

  Returns

  Quote number, order number, items, total, status

Automate Fastenal 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.

• Open invoices handed to accounts payable

  Build this

  Starts

  Every Monday at 8:00

  Step 1

  For each Customer ID you name, get the open balances.

  Step 2

  Keep the invoices that were not there on the last run.

  Step 3

  Post invoice number, invoice date, open amount and Customer ID to your accounting system's webhook.

• Orders whose state changed overnight

  Build this

  Starts

  Every weekday at 7:00

  Step 1

  Get the Order History for the last 30 days.

  Step 2

  Keep the orders whose state changed since the last run.

  Step 3

  Email you the list with order number, current state, parts and delivery details.

• Weekly price and stock check on your core parts

  Build this

  Starts

  Every Friday at 14:00

  Step 1

  For each SKU on your list, check your price and availability.

  Step 2

  Keep the parts whose price changed since the last run or that show out of stock.

  Step 3

  Email you the parts, with the old and new price and the availability message.

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 open balances” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "fastenal.com/get_open_balances",
    "input": {
      "customer_id": "MNACM0042"
    }
  }'

{
  "status": "completed",
  "data": {
    "customer_id": "MNACM0042",
    "account_name": "Acme Manufacturing",
    "account_balance": 8742.15,
    "currency": "USD",
    "invoices_with_balance": 3,
    "by_time_frame": {
      "current": 6120.4,
      "1_30_days": 2321.75,
      "31_60_days": 300,
      "over_60_days": 0
    },
    "invoices": [
      {
        "invoice_number": "MNACM118204",
        "invoice_date": "2026-11-03",
        "open_amount": 6120.4
      }
    ]
  }
}

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.

Fastenal’s own options

Fastenal connects purchasing to your systems through punchout catalogs inside your ERP or eProcurement system and through integrated procurement that its integration specialists design around your systems and formats. Its pages describe no self-serve API. On Fastenal.com you see orders, eQuotes, open balances and My FAST360 reports, and invoices cannot be paid online.

Read on November 12, 2026: Fastenal Digital Tools (e-Business), Fastenal Punchout Catalog, Fastenal.com help: Payments and Balances.

Signing in to Fastenal

Fastenal.com signs you in with your email address and password, with a Keep me signed in option. One login can hold several Fastenal branch account numbers. With Fous you sign in once through Fastenal.com's own sign-in with your own account: the login is sealed with AES-256, and when a session expires Fous signs back in.

Worth knowing

Open balances need a permission

An account administrator must tick Grant Access to View Open Balances for each user, and the branch account must be authenticated with two invoice numbers. The balances are updated daily.

Who sees which orders

Each user sees the orders they created in Order History. Account administrators see the orders of every user on the account, so the account you sign in with decides what a method returns.

Request Only users and purchase limits

Orders from Request Only users, or over a user's purchase limit, go to an approver as Order Requests and are not sent to Fastenal until the approver checks them out.

Several branch accounts, one login

Separate accounts for MRO, OEM, vending or job sites can sit under one registration, and Open Balances asks for the Customer ID each time. A branch account another user already registered cannot be added.

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