How to get enome feature annotation through NCBI api ?

Hi,

I wanna get the whole genome annotion result with some information ,like transcript,exon,gene etc ,
As we know ,NCBI has provided the GFF file containing the above information , but I wanna get the latest content from
NCBI online website because the website is latest, no delay! .
so where can I find NCBI API to download gene annotation batchly ?

Thanks!