https://api.bridgedataoutput.com/api/v2/OData/mlspin/Properties?$filter=toupper(StreetName) eq 'FRONT STREET'&$top=10&$select=ListingKey,ListingContractDate,BedroomsTotal,StreetName,OnMarketDate,PropertyType,ModificationTimestamp,ListAgent,StreetName
Convert a string to upper case (toupper). Lower case would use the function tolower().