https://api.bridgedataoutput.com/api/v2/OData/mlspin/Properties?$filter=geo.distance(Coordinates, POINT(-71.106631 42.388223)) le 3&$top=10
A geographic search from a point in the Data System. Note that the structure of a geospatial search can vary per MLS.Search. Pay attention to MLS Service metadata name for Type=”Edm.GeographyPoint”.