ContractTransactionResponse.cs

 public class ContractTransactionResponse
 {
     public List<Datum> data { get; set; }
     public bool success { get; set; }
     public Meta meta { get; set; }

     public class Datum
     {
         public List<Ret> ret { get; set; }
         public List<string> signature { get; set; }
         public string txID { get; set; }
         public int net_usage { get; set; }
         public string raw_data_hex { get; set; }
         public int net_fee { get; set; }
         public int energy_usage { get; set; }
         public string block_timestamp { get; set; }
         public string blockNumber { get; set; }
         public int energy_fee { get; set; }
         public int energy_usage_total { get; set; }
         public RawData raw_data { get; set; }
         public List<object> internal_transactions { get; set; }

         public class Ret
         {
             public string contractRet { get; set; }
         }

         public class RawData
         {
             public List<Contract> contract { get; set; }
             public string ref_block_bytes { get; set; }
             public string ref_block_hash { get; set; }
             public object expiration { get; set; }
             public int fee_limit { get; set; }
             public object timestamp { get; set; }

             public class Contract
             {
                 public Parameter parameter { get; set; }
                 public string type { get; set; }
                 public class Parameter
                 {
                     public Value value { get; set; }
                     public string type_url { get; set; }

                     public class Value
                     {
                         public string data { get; set; }
                         public string owner_address { get; set; }
                         public string contract_address { get; set; }
                     }
                 }
             }

         }

     }

     public class Meta
     {
         public long at { get; set; }
         public string fingerprint { get; set; }
         public Links links { get; set; }
         public int page_size { get; set; }

         public class Links
         {
             public string next { get; set; }
         }
     }

 }

GetContractTransactions.cs

         // USDT ADDRESS
         GetContractTransactions("TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t");

        /// <summary>
        /// 取得 Contract Transactions 
        /// </summary>
        /// <param name="contractAddress">Contract Address</param>
        static void GetContractTransactions(string contractAddress)
        {


            var client = new RestClient("https://api.trongrid.io/v1/contracts/" + contractAddress + "/transactions");
            var request = new RestRequest("",Method.Get);
            request.AddHeader("accept", "application/json");

            var  response = client.Execute(request);

            var contractTransObj = JsonConvert.DeserializeObject<ContractTransactionResponse>(response.Content);

            foreach (var t in contractTransObj.data) {

                ////最後64位就是金額
                var amount =
                 BigInteger.Parse(t.raw_data.contract[0].parameter.value.data.Substring(t.raw_data.contract[0].parameter.value.data.Length - 64, 64), NumberStyles.AllowHexSpecifier);

                var to = ConvertHexToBase58Check("41" + (t.raw_data.contract[0].parameter.value.data.Substring(32, 40)));  // 取後 20 bytes
                var from = ConvertHexToBase58Check((t.raw_data.contract[0].parameter.value.owner_address));  // 取後 20 bytes


                Console.WriteLine("Block:"+t.blockNumber+", txid:"+t.txID+", from:"+ from + ", to:"+to +" ,amount:"+ amount);
            }

          //  Console.WriteLine(response.Content);

        }