A client transmits one or more lead records to a lead enhancement module that is configured to enhance the received lead records and return enhanced lead records to the client. In one embodiment, the client specifies which of a plurality of enhancements should be applied to lead records received from the particular client. In one embodiment, the lead enhancement module returns a contactability score for each lead record, indicated a likelihood that the individual identified in the lead may be contacted using the contact information provided in the lead record and/or additional contract information located by the lead enhancement module. In one embodiment, data items associated with the individual that are returned to the client are selected based on a vertical market of the client. In one embodiment, custom models that are defined on a per client basis are applied to lead records that are received from the particular client.