Amazon Product Advertising API Developer's Manual page 398

Product Advertising API Developer Guide
Value
relevancerank
reviewrank
SearchIndex: MP3Downloads
Value
price
-price
-releasedate
relevancerank
salesrank
SearchIndex: Music
Value
psrank
salesrank
price
-price
titlerank
-titlerank
artistrank
orig-rel-date
release-date
releasedate
-releasedate
Sort Values for US
Description
Items ranked according to the following criteria: how often the keyword
appears in the description, where the keyword appears, for example,
the ranking is higher when keywords are found in titles, and, if there
are multiple keywords, how closely they occur in descriptions, and,
finally, how often customers purchased the products they found using
the keyword.
Highest to lowest ratings in customer reviews.
Description
Price: low to high
Price: high to low
Release date: most recent to oldest
Items ranked according to the following criteria: how often the keyword
appears in the description, where the keyword appears (for example,
the ranking is higher when keywords are found in titles), how closely
they occur in descriptions (if there are multiple keywords), and how
often customers purchased the products they found using the
keyword.
Bestselling
Description
Bestseller ranking taking into consideration projected sales.The lower
the value, the better the sales.
Bestselling
Price: low to high
Price: high to low
Alphabetical: A to Z
Alphabetical: Z to A
Artist name: A to Z
Original release date of the item listed from newer to older. See
release-date, which sorts by the latest release date.
Sorts by the latest release date from newer to older. See orig-rel-date,
which sorts by the original release date.
Release date: most recent to oldest
Release date: oldest to most recent
API Version 2011-08-01
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