Get the asset model for a given symbol or asset_id. The symbol or asset_id should be passed in as a path parameter.
Note: For crypto, the symbol has to follow old symbology, e.g. BTCUSD.
Note: For coin pairs, the symbol should be separated by spare symbol (/), e.g. BTC/USDT. Since spare is a special character in HTTP, use the URL encoded version instead, e.g. /v2/assets/BTC%2FUSDT