Test a public price endpoint
The symbol-price endpoint accepts a symbol such as BTCUSDT. The example below preserves that query parameter inside the encoded target URL. Use the provider’s current public API documentation to choose the endpoint and fields.
const params = new URLSearchParams({
key: 'YOUR_API_KEY',
url: 'https://api.binance.com/api/v3/ticker/price?symbol=BTCUSDT',
});
const response = await fetch('https://corsproxy.io/?' + params);
if (!response.ok) {
throw new Error('HTTP ' + response.status + ': ' + await response.text());
}
const data = await response.json();
console.log(data);Handle location and access restrictions
An upstream 451 or 403 is different from missing browser CORS headers. Check Binance’s response and supported access requirements. Use a provider and endpoint available to your application rather than treating an upstream rejection as a proxy configuration issue.
Respect provider rate limits
Check the status before reading a price, follow the provider’s retry guidance, and avoid repeatedly polling the same unchanged data. Production caching can reduce repeated reads, but CORSPROXY does not remove Binance quotas.