> For the complete documentation index, see [llms.txt](https://docs.wemix.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wemix.com/en/tutorial/erc-721-token/check-erc-721-token-api.md).

# Check ERC-721 Token API

You can query the ERC-721 Token API using Postman. 

Let's check the inventory for Contract Address in the ERC-721 API in the following order.

* Step 1 : Access Postman
* Step 2 : Execute API and Check the results

{% hint style="info" %}
All examples are based on WEMIX3.0 Testnet.
{% endhint %}

### Step 1 : Access Postman

Go to <https://www.postman.com/> and install Postman.\
After accessing Postman, move to 'Workspaces'.

Select the 'Import' button to insert the  `WEMIX3.0 API.json` file to launch the WEMIX3.0 API.

<figure><img src="/files/oHZMv8LmtMOzIC0jRz35" alt=""><figcaption><p>Postman My Workspace</p></figcaption></figure>

<figure><img src="/files/39LgMDCsMsRErpjMERxF" alt=""><figcaption><p>Execute Postman WEMIX3.0 API</p></figcaption></figure>

### Step 2 : Execute API and Check the result

Select the WEMIX 3.0 ERC-721 API to view the ERC-721 token you want.

#### **Check the Inventory for Contract**

{% tabs %}
{% tab title="Mainnet" %}
<https://explorerapi.wemix.com/v1/tokens/{contract\\_address}/inventory>
{% endtab %}

{% tab title="Testnet" %}
<https://explorerapi.test.wemix.com/v1/tokens/{contract\\_address}/inventory>
{% endtab %}
{% endtabs %}

Enter the URI above in the input box next to 'Get'.&#x20;

You can enter the contract address you want in the {contract\_address} of the URI.&#x20;

The figure below is an example of checking the Testnet ERC-721 token.

```
https://explorerapi.test.wemix.com/v1/tokens/0x3DDeE3714160A49573285473f40452cec67114B4/inventory
```

<figure><img src="/files/kc9Tc0ovWyikFaWXgnrl" alt=""><figcaption><p>Execute API to Check Inventory for Contract</p></figcaption></figure>

If you select 'Send', you can see that the output is the same as the data found in [Testnet Explorer](https://explorer.test.wemix.com/).

<figure><img src="/files/iDtdoRsHNJ1GEBBSVByl" alt=""><figcaption><p>Check Inventory for Contract</p></figcaption></figure>

<figure><img src="/files/Wko2hY0YrNZf8gECBcx7" alt=""><figcaption><p>WEMIX3.0 Testnet Explorer Token Inventory</p></figcaption></figure>