An example of a market listed on an exchange like Coinbase pro is

BTC-USD

which stands for Bitcoin quoted in US Dollar. Here, BTC is the base asset and its price is quoted in USD.

When identifying this market via the APEX:E3 API, the market type needs to be appended as follows:

BTC-USD:CRYPTO

Another example is ETH-USDT listed on Binance. Here Ethereum is the base asset and its price is quoted in USD Tether.

When identiying this market via the APEX:E3 API, the market type needs to be appended as follows:

ETH-USDT:CRYPTO

To view a growing list of supported markets, click here