Add adds or updates the item stats.

AlreadyExists checks to see if item info already exists for a specific currency pair and asset type.

Append adds or updates the item stats for a specific currency pair and asset type.

SortExchangesByPrice sorts item info by volume for a specific currency pair and asset type.

SortExchangesByVolume sorts item info by volume for a specific currency pair and asset type.

Items var array.

Item holds various fields for storing currency pair stats.

ByPrice allows sorting by price.

ByVolume allows sorting by volume.