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The Wide Field X-ray Telescope (WFXT) will provide tens of millions of AGN,with more than 4x10^5 expected at z>3. Here we review the issues present in theidentification of (large) samples of faint and high-redshift X-ray sources, anddescribe a statistical, powerful tool that can be applied to WFXT catalogs. Thedepth of associated optical and near infrared catalogs, needed for a reliableand as much complete as possible identification, are also discussed, along withthe combined synergies with existing or planned facilities

Identification of (high-redshift) AGN with WFXT: lessons from COSMOS and CDFS