Amount of the offer placed. For auction listings, the amount bid on the item (subject to outbid by other buyers). For fixed-price listings, the fixed sale price at which the item is purchased. For auction listings with an active Buy It Now option, this amount will be either the Buy It Now price for purchase or the amount of a bid, depending on the offer type (as specified in Action). For PlaceOffer, the CurrencyID attribute is ignored if provided. Regarding Value-Added Tax (VAT): Even if VAT applies, you do not need to add VAT to the MaxBid value. If VAT applies to the listing, the seller can specify a VAT percent value when they list the item.
See the
Field Index to learn which calls use MaxBid.