nbr 500+: Exchange-specific

What it means

Private values; the spec says to communicate them with buyers beforehand.

A bidder returns nbr on an otherwise empty BidResponse to say why it is not bidding, instead of (or alongside) an HTTP 204. Code 500+ is exchange-specific.

What to do about it

Values of 500 and above are private to the exchange. The spec expects them to be communicated to buyers out of band, so the integration docs of the exchange sending it are the only authoritative source.

Related

• The full nbr code table and how to debug a bidder that stops bidding
• Loss reason codes: the other half of bid feedback
• The validator rule for responses missing both seatbid and nbr