${AUCTION_MBR}

What it expands to

Market Bid Ratio: clearing price divided by bid price.

Market Bid Ratio: the clearing price divided by the bid price, added in 2.5. Some exchanges expand it instead of a cleartext price.

What to watch for

MBR is the price-transparency compromise: you learn proportionally how much you paid without the exchange exposing absolute clearing prices. Your bidder must multiply by its own bid to recover the price.

Encoding

When a macro rides inside another URL as a query parameter, the expanded value must survive URL parsing: exchanges support suffixed forms like ${AUCTION_MBR:B64} (base64) where documented, and values containing reserved characters must be percent-encoded. An unencoded expansion is the most common reason a notice URL truncates at the first ampersand.

Related

• All substitution macros
• Where nurl, burl, and lurl fire in the delivery flow
• Loss reason codes
• ${AUCTION_ID}
• ${AUCTION_BID_ID}
• ${AUCTION_IMP_ID}
• ${AUCTION_SEAT_ID}
• ${AUCTION_AD_ID}