RESTful web api for getting gene information

NCBI's E-Utils

BRCA1
http://eutils.ncbi.nlm.nih.gov/entrez/eutils/esummary.fcgi?db=gene&id=672

BioMart
http://central.biomart.org/martwizard/#!/Search_by_database_name?mart=Hugo+Gene+Nomenclature+(HGNC)+(EBI%2C+UK)&step=1&datasets=hgnc
<!DOCTYPE Query><Query client="true" processor="TSV" limit="-1" header="1"><Dataset name="hgnc" config="hgnc_config_1"><Filter name="gd_status" value="Approved" filter_list=""/><Filter name="gd_app_sym" value="BRCA1" filter_list=""/><Attribute name="gd_aliases"/></Dataset></Query>

HGNC
http://www.genenames.org/cgi-bin/hgnc_downloads.cgi?title=HGNC+output+data&hgnc_dbtag=on&col=gd_app_sym&col=gd_aliases&status=Approved&status=Entry+Withdrawn&status_opt=2&where=&order_by=gd_app_sym_sort&format=text&limit=&submit=submit&.cgifields=&.cgifields=chr&.cgifields=status&.cgifields=hgnc_dbtag