# Check stock across your Nexpart sellers from code

> Run a Nexpart Stock Check across your sellers, look up parts by VIN and read your order history with one API call each. A workflow can check your part list before the shop opens and send the week's orders by seller to accounting.

Page: https://fous.com/automate/nexpart
Updated: 2026-11-12

Works with your own Nexpart account. Fous is an independent product.

## What you can build on Nexpart

### Stock check a part across your sellers

Enters a part number on the Stock Check tab and reads the price and quantity on hand from each seller you have enabled for Stock Check.

- Takes: Part number or interchange number
- Returns: Seller, part number, brand, description, your price, quantity available

### Look up parts for a vehicle

Starts a catalog lookup from a VIN, or a state and license plate, picks a part type and reads the results with price and availability from your sellers.

- Takes: VIN or state and license plate, part type
- Returns: Vehicle, part number, brand, description, seller, price, quantity available

### Get order history across seller accounts

Reads your Multi-Seller order history, which shows the orders placed with all your seller accounts, for a date range.

- Takes: From date, to date, seller (optional)
- Returns: Order date, seller, order number, part numbers, quantities, order total

### Order parts from one seller

Places an order with the seller you name for the part numbers and quantities you give.

- Takes: Seller, part numbers and quantities
- Returns: Order number, seller, items, order total

## Automate Nexpart with a workflow

A [workflow](/product/workflows) 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.

### Morning stock check of your common parts

Starts: Every weekday at 7:00

1. For each part number on your list, stock check the part across your sellers.
2. Keep the parts no seller has in stock, or whose lowest price changed since the last run.
3. Email you the list with seller, price and quantity available.

### Last week's parts orders, by seller, to accounting

Starts: Every Monday at 8:00

1. Get the order history for the previous seven days.
2. Group the orders by seller and add up the order totals.
3. Post each order, with the totals per seller, to your accounting 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](/product/methods), it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Stock check a part across your sellers” would look like.

Example request:

```
curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "nexpart.com/stock_check_part",
    "input": {
      "part_number": "AC-4471"
    }
  }'
```

Example response:

```
{
  "status": "completed",
  "data": {
    "part_number": "AC-4471",
    "results": [
      {
        "seller": "Acme Auto Parts, Main St",
        "brand": "Northwind",
        "description": "Brake pad set, front, ceramic",
        "price": 38.42,
        "currency": "USD",
        "quantity_available": 6
      }
    ],
    "sellers_checked": 2
  }
}
```

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.

## Nexpart’s own options

WHI Solutions publishes no public API for parts buyers. It licenses integration specifications such as NEXLINK, ORDERLINK and CATLINK to the systems that connect to Nexpart, with no published price: you contact WHI sales. A shop reaches Nexpart through one of more than 51 shop management systems or through Multi-Seller, which is free.

| Option | What it covers | What it takes |
| --- | --- | --- |
| NEXLINK | Punch-out from another application, such as a shop management system, to Nexpart, with part and order details sent back to that application. | A license from WHI Solutions. No price is published: contact WHI sales. |
| ORDERLINK and CATLINK | ORDERLINK: pricing, availability and order placement without the Nexpart screens. CATLINK: vehicle and part catalog queries to WHI's servers. | A license from WHI Solutions, for integrators. No price is published. |
| Shop management system integrations | Nexpart ordering from inside the shop management system you already use. | One of the more than 51 shop management systems Nexpart works with, and an account with each seller. |
| Nexpart Multi-Seller by hand | Catalog lookup, Stock Check, ordering from each seller and order history across your seller accounts, in the browser. | A free Multi-Seller account and a verified account with each seller. |

Read on November 12, 2026: [WHI Solutions integration tools](https://www.whisolutions.com/products/integration-tools/), [Nexpart Multi-Seller sign-in and features](https://www.nexpart.com/login-nexpart.html), [Nexpart Multi-Seller announcement](https://www.whisolutions.com/new-product-multi-seller-access-your-part-sellers-with-one-click/).

## Signing in to Nexpart

Nexpart signs you in with a User Name and Password, with a Remember me option, and one Multi-Seller login reaches every seller account you have connected. With Fous you sign in once through Nexpart'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

- **Each seller account is verified first**: You connect a seller under Find a new Seller, with your existing credentials for that seller or a request for a new account. Pending accounts wait for the seller's approval before they appear under My Sellers.
- **Stock Check covers the sellers you enable**: Under My Sellers you choose which verified sellers are enabled in the Multi-Seller Catalog and in Stock Check. A seller left off there does not show in the results a method reads.
- **Give automation its own user**: The Users section of the Dashboard creates separate usernames for employees in each buying location. Create one for your methods, so they do not run under a person's login.
- **Stock Check needs a part number**: Stock Check takes a known part number or interchange number. Without one, start from the catalog: a VIN, a state and license plate, or year, make, model, trim and engine.

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Other industries: [Stellantis DealerCONNECT](/automate/stellantis-dealerconnect), [Paycom](/automate/paycom), [United Rentals Total Control](/automate/united-rentals-total-control), [Trek B2B](/automate/trek-b2b), [楽天市場 RMS](/automate/rakuten-rms), [Edexcel Online](/automate/edexcel-online).

## Frequently asked questions

### Does Nexpart have an API?

Not a public one for parts buyers. WHI Solutions licenses integration specifications, among them NEXLINK for punch-out and ORDERLINK for pricing, availability and orders, to the systems that connect to Nexpart, and publishes no price. Otherwise a shop uses it inside one of more than 51 shop management systems or in Multi-Seller.

### Can I check price and stock at all my sellers at once?

Yes, in Multi-Seller's Stock Check. You enter a part number or interchange number once and see pricing and availability from each seller you have enabled for Stock Check. A method can run the same search from your code and return one row per seller.

### Can I see orders from all my seller accounts in one place?

Yes. Multi-Seller has an order history and reporting dashboard that shows orders from all your seller accounts. With Fous, a workflow you build can read it every week and post the orders to your own system by webhook.

### How do I add a seller to Nexpart Multi-Seller?

Open the Dashboard, select Find a new Seller, search by address or zip code and click Add on the seller. Then enter your existing credentials for that seller, or request a new account, and wait for the seller to approve it.

### Is Fous affiliated with WHI Solutions?

No. Fous is an independent product. You use it with your own Nexpart account, and a method reads and does only what that account can.

Fous is an independent product: it is not affiliated with, endorsed by or sponsored by the operator of Nexpart (WHI Solutions). The name is used only to say which system this page is about. Something here wrong or out of date? Write to legal@fous.com.