Marketo has a field "Is Anonymous". If the field value is "true", Marketo considers that lead an Anonymous lead. All other lead records are considered "known".
i know that the field exists in marketo lead, however this field is not returned by API method getLead, the question is how to get the indication via SOAP API?
You should be able to use GetMultipleLeads with the parameter "Is Anonymous = true" to return a list of all leads that are anonymous. Have you tried this?
i didnt see getMultipleLeads receives such parameter. moreover, i saw it has only one parameter lastUpdateAt. could you show sample of the call with isAnonymous and in general which criteria may be used in this method?