When fetching URL_PERFORMANCE_REPORT, clicks and cost per domain match the 
Placements report in the UI. However, impressions do not, they are much 
lower in the API report than in the UI (usually around 50 %, but in some 
cases much less). 

For example this query:

SELECT+Domain%2C+Impressions+FROM+URL_PERFORMANCE_REPORT+DURING+20130101%2C20131031

returns this:

"URL_PERFORMANCE_REPORT (Jan 1, 2013-Oct 31, 2013)"
Domain Impressions
thefreedictionary.com 3
linkmoon.net 2
squidoo.com 2
web-sniffer.me 1
luxyad.com 102
mobileapp::1-412693531 1
statmyweb.com 6
tiny.cc 9
sitesanalytics.com 3
webboar.com 1
statsie.com 3
lolcounter.com 101
wikipeta.com 1
webboar.com 1
luxyad.com 1210
sitesanalytics.com 1
statscrop.com 1
col3negchannel.org 1
siteaero.com 1
altezzavip.com 1
blogspot.de 1
take-a-way.co.uk 6
statmyweb.com 1
mail.google.com 5
statmyweb.com 1
eazylike.com 1
otakuhouse.com 1
rapidcounter.com 14
wbit.info 1
mobileapp::2-app.luckyyu.gread.freetoole 128
linkmoon.net 2
lawyer-laws.com 1
webstatsdomain.com 1
flagcounter.com 1
mail.google.com 2
freeonlineusers.com 22
statscrop.com 1
mail.google.com 1
visualizetraffic.com 1
searchtherightwords.com 1
linkmoon.net 1
flagcounter.com 1
statigr.am 1
amaregna.com 1
freeweblogger.com 1
flagcounter.com 2
mobileapp::1-324020229 5
statmyweb.com 2
nepalionlinecards.com 1
sitesanalytics.com 1
120url.com 1
autobnz.com 3
hypestat.com 1
koreadaily.com 288
programe.pro 3
edietguids.com 113
statigr.am 1
revolvermaps.com 18
hypestat.com 2
skyblock.net 56
checkingstats.com 1
mail.google.com 2
serptrends.com 1
statmyweb.com 1
sitetrend.info 1
statmyweb.com 2
outerstats.com 1
hopy.com 25
reader.co.il 1
wwwsixs.com 1
statigr.am 174
lawyer-laws.com 1
mail.google.com 1
statmyweb.com 52
dotwireless.com 6
www-googli.com 7
salatimes.com 2
webstats-ranks.com 1
pinaspad.com 1
webmator.com 1
alexa.com 1
anonymous.google 14
mypinoymovie.net 1
s2r.co 1
mail.google.com 1
sltudrive.com 2331
epicstat.com 1
hopy.com 1
mail.google.com 1
gamegab.com 2
dailymotion.com 1
dopple-analytics.com 110
statscrop.com 1
statmyweb.com 1
markosweb.com 62
anonymous.google 3390
isoftwarereviews.com 1
aka.gr 2
youtube.com 1
Total 8350


Looking at Display Network: Placements, I get this:

<https://lh3.googleusercontent.com/-qahvcZxLcbY/Uo2zWnePiWI/AAAAAAAAAaU/eqMphQQFAbU/s1600/Screen+Shot+2013-11-21+at+9.15.05.png>
In the UI, the total for all rows is 121,190. See for example 
"mail.google.com", 
which has 54971 impressions in the UI, but only 13 in the URL Performance 
Report (summing the seven rows with that domain). If I include cost and 
cliicks in the API report, those match with the UI.

(There's only one campaign & adgroup for display network on that account. 
The results are the same if I include the campaign and adgroup columns in 
the API report) 

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