Enumeration PriceType

Ask price.

Bid price.

Close price.

Last price.

Mid price, calculated as the arithmetic average of bid and ask prices.

Mid equivalent price, calculated as a) the arithmetic average of bid and ask prices when both are available; b) either the bid or the ask price if any of them is available; c) the last price; or d) the close price.

Safe Mid price, returns the mid price only if both bid and ask are available.