如何在智能合約中獲取 eth 的價格（以 INR 為單位）？

我想創建一個像 DAI 這樣的穩定幣，但我不想將其與美元掛鉤，而是將其與 INR 掛鉤。問題是我無法找到 ETH 到 INR 的連結價格。

有INR/USD數據饋送可以讓我們計算ETH/INR, 使用ETH/USD. 您可以按照官方文件中的這個範例進行操作。

面額公式如下所示：

這是您可以用作起點的範常式式碼：

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

/**
* Network: Mainnet
* Base: ETH/USD
* Base Address: 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419
* Quote: INR/USD
* Quote Address: 0x605D5c2fBCeDb217D7987FC0951B5753069bC360
* Decimals: 8
*/

/**
* THIS IS AN EXAMPLE CONTRACT THAT USES HARDCODED VALUES FOR CLARITY.
* THIS IS AN EXAMPLE CONTRACT THAT USES UN-AUDITED CODE.
* DO NOT USE THIS CODE IN PRODUCTION.
*/

contract PriceConverter {
   function getDerivedPrice(address _base, address _quote, uint8 _decimals)
       public
       view
       returns (int256)
   {
       require(_decimals > uint8(0) && _decimals <= uint8(18), "Invalid _decimals");
       int256 decimals = int256(10 ** uint256(_decimals));
       ( , int256 basePrice, , , ) = AggregatorV3Interface(_base).latestRoundData();
       uint8 baseDecimals = AggregatorV3Interface(_base).decimals();
       basePrice = scalePrice(basePrice, baseDecimals, _decimals);

       ( , int256 quotePrice, , , ) = AggregatorV3Interface(_quote).latestRoundData();
       uint8 quoteDecimals = AggregatorV3Interface(_quote).decimals();
       quotePrice = scalePrice(quotePrice, quoteDecimals, _decimals);

       return basePrice * decimals / quotePrice;
   }

   function scalePrice(int256 _price, uint8 _priceDecimals, uint8 _decimals)
       internal
       pure
       returns (int256)
   {
       if (_priceDecimals < _decimals) {
           return _price * int256(10 ** uint256(_decimals - _priceDecimals));
       } else if (_priceDecimals > _decimals) {
           return _price / int256(10 ** uint256(_priceDecimals - _decimals));
       }
       return _price;
   }
}

引用自：https://ethereum.stackexchange.com/questions/137354