php 환율 api curl 이용

$exchange_url="http://api.fixer.io/latest?base=HKD";

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $exchange_url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 1000);

$rt = curl_exec($ch);

curl_close($ch);

// var_dump(json_decode($rt));

$hwan_api = json_decode($rt);

$hwan_krw = $hwan_api->rates->KRW;

//echo $hwan_krw;

그외 

http://fx.kebhana.com/FER1101M.web

외환은행 환율 api