# Custom Usage

[api.market](https://api.market/) allows you to set custom Usage reported by your backend. These changes need to be made in your API backend. Hence when [api.market](https://api.market/) calls your API backend, then that backend must add this header to the response.

Please make sure you mention this clearly in your Product description on [api.market](https://api.market/). You must also include this in your docs.

### Default Behavior:

By default, each request consumes "1" API call for the given Pricing Plan. Hence the default header is added to all requests:

```
X-Magicapi-Billing: API=1;
```

### Allow "unlimited" calls for certain endpoints <a href="#allow-unlimited-calls-for-certain-endpoints" id="allow-unlimited-calls-for-certain-endpoints"></a>

If you wish to make certain endpoints "FREE". i.e. To NOT reduce the API usage when a user requests those endpointPaths. Then you can simply pass this header:

```
X-Magicapi-Billing: API=0;
```

This will not "increase" the total API calls used in the given plan.

### Charge more than "1" API unit for a request <a href="#charge-more-than-1-api-unit-for-a-request" id="charge-more-than-1-api-unit-for-a-request"></a>

Similarly to charge more than "one" unit per request, you can update this header to the custom usage and send it as a response in your API.

```
X-Magicapi-Billing: API=3;
```