# 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>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.wemix.com/en/tutorial/erc-721-token/check-erc-721-token-api.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.