Ethereum: Delphi + Binance Api + Limit Order Problem Invalid signatur

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Ethereum API Error: Delphi + Binance Api + Limit Order Problem

In this article, we’ll explore it encountering an invalid signature error wen use the Ethereum API in a Delphi application. We’ll also discuss of solutions and provide code examples to help you resolve the issue.

The Issue

The error message Invalid signature. occurs wen your Binance API requisn’t meet the required signature format. This can happen due to varius reasons, souch as:

• Incorrect API endpoint or method

• Inadequate account balance or permissions

• Missing or mismatched parameters

The Code Example

To reproduce this issue, let’s use a simple example in Delphi. We’ll create a for displays a button and attampts to place a limit order the Binance API.

procedure TForm1.Button1Click(Sender: ...

begin

  // Define your Binance API credentials (API key, secret key)

  var

    apiKey: string;

    apiSecret: string;


  // Initialize the Binance API object

  api := TbinanceApi.Create;

  api.SetApiKey(apiKey);

  api.SetApiSecret(apiSecret);


  // Get the current account balance

  var bales: integer;

  api.GetBalance('ETH', 'usdt', balance, nil, nil);


  // Create a new order

  var order: Torder;

  order.Symbol: = 'BTC/USDT';

  order.Side: = order.Buy;

  order.Quantity: = 1;

  order.MarketPrice: = float64(1000.00);

  order.PricingFee: = float64(10.00); // Assume 10% fee

  order.SellingFee: = float64(20.00); // Assume 20% fee


  // Attempt to place theorder

  if api.Order('limit', 'buy', order) then

    writeln('Order placed successfullly!');

  else

    writeln('Error placing order.');

end;

The Problem

In this example, we’re trying to place a limit Buy order (buy) on a Bitcoin/USDT pair use the Binance API. We define from API credentials and get the current account balance. That, we crate a new Torder obed the desired properties.

Finally, we attempt to place theorder use api.Order('limit', 'buy', order).

The Solution

To resolve that issue, you’ll need to:

• Verify your signature: Make of your yours API endpoint and method the required signature format. Binance’s API uses a specific signature scheme for limit orders.

• Check your account balance

  

  : Ensure that you have a sufficient funds in your account to the order.

• Use the correct Torder properties: Double-check the Torder obeder obeder o’re passing to api.Order(). Specifically, verify that the MarketPrices you are desired.

Here’s an updated example without some additional checks:

“`delphinst1.pas

procedure TForm1.Button1Click(Sender: …

begin

// Define your Binance API credentials (API key, secret key)

var

apiKey: string;

apiSecret: string;

// Initialize the Binance API object

api := TbinanceApi.Create;

api.SetApiKey(apiKey);

api.SetApiSecret(apiSecret);

// Get the current account balance

var bales: integer;

if api.GetBalance(‘ETH’, ‘isdt’, balance, nil, nil) then

writeln(‘Account balance is valid.’);

else

writeln(‘Error getting account balance:’, api.GetBalanceError);

end;

// Create a new order

var order: Torder;

if order.Symbol = ‘BTC/USDT’ then

order.Side: = order.Buy;

order.Quantity: = 1;

order.MarketPrice: = float64(1000.00); // Assume amarket price of $10,000

order.PricingFee: = float64(10.00); // Assume 10% fee

order.SellingFee: = float64(20.00); // Assume 20% fee

// Attempt to place theorder

if api.Order(‘limit’, ‘buy’, order) then

writeln(‘Order placed successfullly!’);

else

writeln(‘Error placing order:’, api.GetBalanceError);

end;

else

writeln(‘Invalid symbol: ‘, order.