@dharrigan I tried that but it still gives “{\“message\“:\“API KEY missing from x-api-key header\“}”

@ps it seems you are concatenating the map containing headers inside str - perhaps it should be this instead?

(client/get (str ""
                      (-> req :params :contract-address)                   
                      "/owners?chain=eth&format=decimal")
            {:headers {:accept "application/json" "X-API-Key" "myapikey"}})

yes that fixed it