Amazon Product Advertising API Developer's Manual page 343

Product Advertising API Developer Guide
Value
relevancerank
reviewrank
salesrank
SearchIndex: OutdoorLiving
Value
salesrank
price
-price
titlerank
-titlerank
SearchIndex: Outlet
You cannot use any sort parameters with the Outlet search index.
SearchIndex: PCHardware
Value
psrank
salesrank
price
-price
titlerank
reviewrank
SearchIndex: Photo
Value
salesrank
price
Sort Values for DE
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.
Bestselling
Description
Bestselling
Price: low to high
Price: high to low
Alphabetical: A to Z
Alphabetical: Z to A
Description
The sales rank taking into consideration projected sales.
Bestselling
Price: low to high
Price: high to low
Alphabetical: A to Z
Average customer review: high to low
Description
Bestselling
Price: low to high
API Version 2011-08-01
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