<?php
// Function to get pair address for a token paired with USDC using Dexscreener API
function getPairAddress($tokenSymbol) {
  // Dexscreener Search API URL
  $searchApiUrl = "https://api.dexscreener.com/latest/dex/search?q=" . urlencode($tokenSymbol);

  // Initialize cURL session for the search API
  $ch = curl_init();

  // Set the URL and other options for the cURL session
  curl_setopt($ch, CURLOPT_URL, $searchApiUrl);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

  // Execute the cURL session and store the result
  $searchResponse = curl_exec($ch);

  // Check for errors in cURL execution
  if ($searchResponse === false) {
      echo 'cURL Error: ' . curl_error($ch);
      return null;
  }

  // Decode the JSON search response
  $searchData = json_decode($searchResponse, true);
  
  $pairs = $searchData['pairs'];
  $highestPair = $pairs[0];
  foreach($pairs as $pair){
    $vol = $pair["volume"]["h24"];
    if($vol > $highestPair["volume"]["h24"]){
        $highestPair =$pair;
    } 
  }

  echo json_encode($highestPair);

  // Return null if no pair found
  return null;
}
?>