@chethan said it correct, each Programmatic access request for Custom Search API has an upper limit of response. It is 10 images. If more results are requested, the following is returned by API: "Request contains an invalid argument.". Details: "[{'message': 'Request contains an invalid argument.', 'domain': 'global', 'reason': 'badRequest'} This is the default setting that I found. Hope it helps. Cheers!