大家汇率转换都用什么开放接口？

function ConvertTo-MyCurrency {
param(
# Default: 1
[Parameter(Mandatory=$false)]
[ValidateScript({$_ -gt 0})]
$Amount = 1,

# Default: USD
[Parameter(Mandatory=$false)]
[ValidateSet("CNY","AED","AFN","ALL","AMD","ANG","AOA","ARS","AUD","AWG","AZN","BAM","BBD","BDT","BGN","BHD","BIF","BMD","BND","BOB","BRL","BSD","BTC","BTN","BWP","BYN","BYR","BZD","CAD","CDF","CHF","CLF","CLP","CNH","COP","CRC","CUP","CVE","CZK","DEM","DJF","DKK","DOP","DZD","EGP","ERN","ETB","EUR","FIM","FJD","FKP","FRF","GBP","GEL","GHS","GIP","GMD","GNF","GTQ","GYD","HKD","HNL","HRK","HTG","HUF","IDR","IEP","ILS","INR","IQD","IRR","ISK","ITL","JMD","JOD","JPY","KES","KGS","KHR","KMF","KPW","KRW","KWD","KYD","KZT","LAK","LBP","LKR","LRD","LSL","LTL","LVL","LYD","MAD","MDL","MGA","MKD","MMK","MNT","MOP","MRO","MUR","MVR","MWK","MXN","MYR","MZN","NAD","NGN","NIO","NOK","NPR","NZD","OMR","PAB","PEN","PGK","PHP","PKG","PKR","PLN","PYG","QAR","RON","RSD","RUB","RWF","SAR","SBD","SCR","SDG","SEK","SGD","SHP","SKK","SLL","SOS","SRD","STD","SVC","SYP","SZL","THB","TJS","TMT","TND","TOP","TRY","TTD","TWD","TZS","UAH","UGX","USD","UYU","UZS","VEF","VND","VUV","WST","XAF","XCD","XDR","XOF","XPF","YER","ZAR","ZMK","ZMW","ZWL")]
[string]$From="USD",

# Default: CNY
[Parameter(Mandatory=$false)]
[ValidateSet("CNY","AED","AFN","ALL","AMD","ANG","AOA","ARS","AUD","AWG","AZN","BAM","BBD","BDT","BGN","BHD","BIF","BMD","BND","BOB","BRL","BSD","BTC","BTN","BWP","BYN","BYR","BZD","CAD","CDF","CHF","CLF","CLP","CNH","COP","CRC","CUP","CVE","CZK","DEM","DJF","DKK","DOP","DZD","EGP","ERN","ETB","EUR","FIM","FJD","FKP","FRF","GBP","GEL","GHS","GIP","GMD","GNF","GTQ","GYD","HKD","HNL","HRK","HTG","HUF","IDR","IEP","ILS","INR","IQD","IRR","ISK","ITL","JMD","JOD","JPY","KES","KGS","KHR","KMF","KPW","KRW","KWD","KYD","KZT","LAK","LBP","LKR","LRD","LSL","LTL","LVL","LYD","MAD","MDL","MGA","MKD","MMK","MNT","MOP","MRO","MUR","MVR","MWK","MXN","MYR","MZN","NAD","NGN","NIO","NOK","NPR","NZD","OMR","PAB","PEN","PGK","PHP","PKG","PKR","PLN","PYG","QAR","RON","RSD","RUB","RWF","SAR","SBD","SCR","SDG","SEK","SGD","SHP","SKK","SLL","SOS","SRD","STD","SVC","SYP","SZL","THB","TJS","TMT","TND","TOP","TRY","TTD","TWD","TZS","UAH","UGX","USD","UYU","UZS","VEF","VND","VUV","WST","XAF","XCD","XDR","XOF","XPF","YER","ZAR","ZMK","ZMW","ZWL")]
[string]$To="CNY"
)
if ($From -eq $To) {
Write-Warning -Message "Idiot! You can't convert $From to $To by yourself?!"
break
   }
$url = "https://finance.google.cn/finance/converter?a=$Amount&from=$From&to=$To"
$result = (Invoke-WebRequest -Uri $url).content -replace "(.*\
)*.*bld>|\\s$To.*(.*\
)*"
Write-Host "`t$Amount $From=$result $To"
}

// 以下为回传的JSON
{
  "base": "CNY",
  "date": "2020-02-15",
  "time_last_updated": 1581725174,
  "rates": {
    "CNY": 1,
    "AED": 0.525723,
    "ARS": 8.790734,
    "AUD": 0.213046,
    "BGN": 0.258199,
    "BRL": 0.619876,
    "BSD": 0.143173,
    "CAD": 0.189726,
    "CHF": 0.140383,
    "CLP": 113.781956,
    "COP": 474.333333,
    "CZK": 3.280837,
    "DKK": 0.986649,
    "DOP": 7.660834,
    "EGP": 2.236103,
    "EUR": 0.132045,
    "FJD": 0.314397,
    "GBP": 0.109808,
    "GTQ": 1.093564,
    "HKD": 1.112071,
    "HRK": 0.983405,
    "HUF": 44.423993,
    "IDR": 1948.539913,
    "ILS": 0.490721,
    "INR": 10.223288,
    "ISK": 18.159971,
    "JPY": 15.724386,
    "KRW": 169.51805,
    "KZT": 53.952607,
    "MXN": 2.661942,
    "MYR": 0.592797,
    "NOK": 1.325096,
    "NZD": 0.222418,
    "PAB": 0.143173,
    "PEN": 0.484272,
    "PHP": 7.232829,
    "PKR": 22.104854,
    "PLN": 0.560941,
    "PYG": 948.666667,
    "RON": 0.629401,
    "RUB": 9.097323,
    "SAR": 0.537152,
    "SEK": 1.38726,
    "SGD": 0.199096,
    "THB": 4.462466,
    "TRY": 0.866671,
    "TWD": 4.297319,
    "UAH": 3.484763,
    "USD": 0.143181,
    "UYU": 5.423535,
    "ZAR": 2.12973
  }
}

$.ajax({
    url: 'https://api.exchangerate-api.com/v4/latest/CNY',
    type: 'GET',
    success: function (result) {
       console.log(result);
    }
});