Customize Tangem Gas Fee with Surge Script

surge-tangem-gas-fee.js

if (
  $request.method === 'POST' &&
  $request.headers['Content-Type'] === 'application/json' &&
  $request.headers['User-Agent'].includes('Tangem')
) {
  try {
    let response = JSON.parse($response.body);

    let baseFeesPerGas = response.result?.baseFeePerGas;

    if (baseFeesPerGas) {
      let baseFeePerGas = parseInt(
        baseFeesPerGas[baseFeesPerGas.length - 1].replace(/^0x/, ''),
        16,
      );

      let [baseFee, priorityFee = baseFee * 0.2] = $argument
        .split(',')
        .map(segment => Number(segment));

      response.result.baseFeePerGas = [
        '0x' + Math.floor(Math.min(baseFee * 1e9, baseFeePerGas)).toString(16),
      ];

      response.result.reward = [
        new Array(3).fill('0x' + Math.floor(priorityFee * 1e9).toString(16)),
      ];

      $done({
        body: JSON.stringify(response),
      });
    } else {
      $done({});
    }
  } catch (error) {
    console.log(error);
    $done({});
  }
} else {
  $done({});
}