{"service":"xwalk-geo","description":"US ZIP → congressional district / county / metro (CBSA) with HUD allocation ratios for split ZIPs.","endpoints":{"resolve":"/v1/resolve?zip=30252&congress=119","sessions":"/v1/sessions","health":"/health","docs":"/docs"},"data":"HUD-USPS ZIP Crosswalk + Census (public domain). Not affiliated with USPS/HUD."}