# Interface

## Theory

The interface class provides consistent access to the supported exchanges.

**The idea is that as long as scripts aren't using "exchange specific" information, if all calls are run through here, then it gives the developer the ability to *****instantly switch between exchanges*****.**

This means a few things about the information through the Interface:

* **Pre-typed.** Information guaranteed by the interface comes pre-casted. Most information sent from API's comes as strings, but the interface class converts these for easy access.
* **Less Detailed.** Different exchanges give different data. We try to pick out the most important bits of information to conecrate on maintaining, but some of it will end up in the `exchange_specific` tag on the dictionary returned.
* **Multiple API Calls**. Sometimes to accumulate the data required to tell the user everything they need to know, it requires multiple API calls to be run in the background.

## REST API Functions

### get\_products

The function minimally gives an array with dictionaries such as:

```python
[
    {
        "currency_id": "BTC-USD",
        "base_currency": "BTC",
        "quote_currency": "USD",
        "base_min_size": "0.0001",
        "base_max_size": "280",
        "base_increment": "base_increment"
    },
...
]
```

| Key             | Description                                                         |
| --------------- | ------------------------------------------------------------------- |
| currency\_id    | The currency pair of this exchange's products                       |
| base\_currency  | The base currency in the trading pair                               |
| quote\_currency | The quote currency in the trading pair                              |
| base\_min\_size | Smallest amount of base currency that can be bought on the exchange |
| base\_max\_size | Largest amount of base currency that can be bought on the exchange  |

### get\_account(currency=None, account\_id=None)

The function minimally gives an array with dictionaries or *just* a dictionary depending on arguments.

## Housekeeping & Utils Functions

#### get\_calls

`get_calls` 

`append_ticker_manager` d