Binance API - Get Klines for XXX/GBP only - php

Question

I am calling the Binance Klines API to get current prices.
// Get Assets - ideally I'd just like the currency name (e.g. ETH) rather ETC/BTC
$url = 'https://api.binance.com/api/v3/exchangeInfo';
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
$result = curl_exec($ch);
curl_close($ch);
$json = json_decode($result);
foreach($json->symbols as $symbol)
{
// Get prices for teh asset
$ccode = $symbol->symbol;
$nurl = 'https://api.binance.com/api/v3/klines?symbol=' . $ccode . '&interval=1m';
$stime = 1000*(time() - 60); // Time period is the last minute
$etime = 1000*time();
$nurl .= '&startTime=' . $stime;
$nurl .= '&endTime=' . $etime;
$ch = curl_init($nurl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_URL, $nurl);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0);
$json = curl_exec($ch);
curl_close($ch);
if ( $json === "" || $json === "[]" || substr($json, 0, 8) == '{"code":' )
{
echo "Not found " . $ccode . " .. skipping <BR>";
continue;
}
$arr = explode(",", $json);
$price = $arr[4];
$tstamp1 = $arr[6];
$tstamp = gmdate("Y-m-d\TH:i:s\Z", ($arr[6]/1000));
echo $ccode . " " . $tstamp . " " . $price . "<BR>";
}
The problem is I get all combinations of coin/currency, when I only want the GBP prices for each coin. The full list about times out as it runs for over 5 minutes.
I'd like to just get the price of each coin in GBP.
How can I do that?

Answer 1

You're asking for all the symbols (exchangeInfo) and then getting the candle info (klines) for each symbol (= currency pair).
You can do so just for the GBP pairs by looking for GBP in the two currencies you're currently iterating on, by adding this to your foreach:
// rest of the code
foreach($json->symbols as $symbol)
{
if ($symbol->baseAsset === "GBP" || $symbol->quoteAsset === "GBP" ) {
// rest of your foreach
}
}
In your foreach you have these three properties under $symbol you can leverage:
$symbol->symbol // "ADAGBP"
$symbol->baseAsset // "ADA"
$symbol->quoteAsset // "GBP"