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feat: Add Sell and Stop-loss methods to Aster Exchange client #46

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feat: Add Sell and Stop-loss methods to Aster Exchange client #46

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d125927
feat: Add Sell and Stop-loss methods to Aster Exchange client
google-labs-jules[bot] Oct 30, 2025
6f2e73b
Rename AsterBuy.cs to Aster.cs
ds80web Oct 30, 2025
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102 changes: 102 additions & 0 deletions Aster.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Security.Cryptography;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;

public class OrderResponse
{
public bool Success { get; set; }
public string Message { get; set; }
public JsonElement Data { get; set; }
}

public class AsterExchange
{
private string Sign(string apiSecret, string stringToSign)
{
using (var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(apiSecret)))
{
return BitConverter.ToString(hmac.ComputeHash(Encoding.UTF8.GetBytes(stringToSign))).Replace("-", "").ToLower();
}
}

private async Task<OrderResponse> PlaceOrderAsync(string apiKey, string apiSecret, string symbol, decimal quantity, decimal price, string side, string type = "LIMIT", decimal? stopPrice = null)
{
using (var client = new HttpClient())
{
try
{
var request = new HttpRequestMessage(HttpMethod.Post, "https://api.aster.exchange/v3/trade");

var timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds().ToString();
var parameters = new SortedDictionary<string, string>
{
{ "api_key", apiKey },
{ "timestamp", timestamp },
{ "symbol", symbol },
{ "quantity", quantity.ToString() },
{ "price", price.ToString() },
{ "side", side },
{ "type", type }
};

if (stopPrice.HasValue)
{
parameters.Add("stopPrice", stopPrice.Value.ToString());
}

var stringToSign = string.Join("&", parameters.Select(kvp => $"{kvp.Key}={kvp.Value}"));
var signature = Sign(apiSecret, stringToSign);
parameters.Add("signature", signature);

request.Content = new FormUrlEncodedContent(parameters);

var response = await client.SendAsync(request);
var responseContent = await response.Content.ReadAsStringAsync();

if (!response.IsSuccessStatusCode)
{
return new OrderResponse { Success = false, Message = $"API Error: {response.StatusCode} - {responseContent}" };
}

var parsedResponse = JsonSerializer.Deserialize<JsonElement>(responseContent);
return new OrderResponse { Success = true, Message = "Order placed successfully.", Data = parsedResponse };
}
catch (HttpRequestException ex)
{
return new OrderResponse { Success = false, Message = $"Request Error: {ex.Message}" };
}
}
}

public async Task<List<OrderResponse>> PlaceBuyOrder(string apiKey, string apiSecret, string symbol, decimal quantity, decimal price, decimal stopLossPercentage = 1.0m)
{
var responses = new List<OrderResponse>();

var buyOrderResponse = await PlaceOrderAsync(apiKey, apiSecret, symbol, quantity, price, "BUY");
responses.Add(buyOrderResponse);

if (buyOrderResponse.Success)
{
var stopPrice = price * (1 - (stopLossPercentage / 100));
var stopLossResponse = await PlaceStopLossOrder(apiKey, apiSecret, symbol, quantity, stopPrice, stopPrice);
responses.Add(stopLossResponse);
}

return responses;
}

public async Task<OrderResponse> PlaceSellOrder(string apiKey, string apiSecret, string symbol, decimal quantity, decimal price)
{
return await PlaceOrderAsync(apiKey, apiSecret, symbol, quantity, price, "SELL");
}

public async Task<OrderResponse> PlaceStopLossOrder(string apiKey, string apiSecret, string symbol, decimal quantity, decimal price, decimal stopPrice)
{
return await PlaceOrderAsync(apiKey, apiSecret, symbol, quantity, price, "SELL", "STOP_LOSS_LIMIT", stopPrice);
}
}
74 changes: 74 additions & 0 deletions Program.cs
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using System;
using System.Threading.Tasks;

public class Program
{
public static async Task Main(string[] args)
{
Console.Write("Enter your API Key: ");
string apiKey = Console.ReadLine();

Console.Write("Enter your API Secret: ");
string apiSecret = Console.ReadLine();

var exchange = new AsterExchange();

string symbol = "BTCUSDT"; // Default symbol

Console.WriteLine("\nChoose an action:");
Console.WriteLine("1. Place a Buy Order (with 1% Stop-Loss)");
Console.WriteLine("2. Place a Sell Order");
Console.Write("Enter your choice (1 or 2): ");
string choice = Console.ReadLine();

if (choice == "1")
{
Console.Write($"Enter quantity for {symbol}: ");
decimal buyQuantity = decimal.Parse(Console.ReadLine());
Console.Write($"Enter price for {symbol}: ");
decimal buyPrice = decimal.Parse(Console.ReadLine());

Console.WriteLine($"\nPlacing a buy order for {buyQuantity} {symbol} at {buyPrice} with a 1% stop-loss...");

var buyResponses = await exchange.PlaceBuyOrder(apiKey, apiSecret, symbol, buyQuantity, buyPrice);

foreach (var response in buyResponses)
{
if (response.Success)
{
Console.WriteLine("Order placed successfully!");
Console.WriteLine($"Response Data: {response.Data}");
}
else
{
Console.WriteLine($"Failed to place order: {response.Message}");
}
}
}
else if (choice == "2")
{
Console.Write($"Enter quantity for {symbol}: ");
decimal sellQuantity = decimal.Parse(Console.ReadLine());
Console.Write($"Enter price for {symbol}: ");
decimal sellPrice = decimal.Parse(Console.ReadLine());

Console.WriteLine($"\nPlacing a sell order for {sellQuantity} {symbol} at {sellPrice}...");

var sellResponse = await exchange.PlaceSellOrder(apiKey, apiSecret, symbol, sellQuantity, sellPrice);

if (sellResponse.Success)
{
Console.WriteLine("Order placed successfully!");
Console.WriteLine($"Response Data: {sellResponse.Data}");
}
else
{
Console.WriteLine($"Failed to place order: {sellResponse.Message}");
}
}
else
{
Console.WriteLine("Invalid choice.");
}
}
}