How to monitor usage of Google Custom Search Engine -

i'm migrating google's google site search (gss) google custom search engine (cse). i'm using atom/json api via php library, current gss service. i've created new cse search engine in account , updated secret key , search engine id in php configuration.

but i'm not sure how can monitor usage of new cse search engine? how can tell whether i've run out of requests? how know when need pay? in fact, how know search requests going new cse , not old gss?

is there sort of logging of searches made using cse can check?

as side question, don't understand how cse ad-supported. atom/json api doesn't seem include ads in results. , if did, how can google force me display them?

you can basic usage stats on statistics tab (https://cse.google.ca/cse/statistics/stats?cx=) or more detailed statistics creating free google analytics account here , associating cse adding analytics id @ (https://cse.google.ca/cse/statistics/ga?cx=). analytics mobile app (android or ios)is pretty slick , can customized countless ways.

i have cse setup detailed context & annotations i'm new atom/json/php , suffering bit of learning curve in developing decent site work cse. chance you'd share code me learning tool me? :-)