Ethereum: Delphi + Binance Api + Limit Order Problem Invalid signatur
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Ethereum API Error: Delphi + Binance API + Limit Order Issue
In this article, we will investigate why you are experiencing an invalid signature error when using the Ethereum API in a Delphi application. We will also discuss possible solutions and provide code examples to resolve the issue.
The Problem
The “Invalid Signature.” An error message is displayed when a request to the Binance API does not match the required signature format. This can occur for a variety of reasons, such as:
- Incorrect API endpoint or method
- Incorrect account balance or permissions
- Missing or mismatched parameters
The Code Example
To reproduce the issue, let’s use a simple example in Delphi. We will create a form that displays a button and attempts to place a limit order using the Binance API.
procedure TForm1.Button1Click(Sender: ...
begin
// Set 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 current account balance
var balance: integer;
api.GetBalance('ETH', 'usdt', balance, nil, nil);
// Create new order
var order : Order ;
order.Symbol: = 'BTC/USDT';
order.Page: = order.Buy;
order . Quantity : = 1 ;
order . MarketPrice : = float64 ( 1000.00 );
order . PricingFee : = float 64 ( 10.00 ); // Set the 10% fee
order . SellFee : = float 64 ( 20.00 ); // Set the 20% fee
// Attempt to place an order
if api.Order('limit','buy',order) then
writeln('Order successfully placed!');
else
writeln('Error placing order.');
end;
The Problem
In this example, we are trying to place a limit buy order (buy) on Bitcoin/USDT using the Binance API. We specify our API credentials and get the current account balance. We then create a new Order object with the desired properties.
Finally, we try to place the order using api.Order('limit', 'buy', order)'
The Solution
To fix this issue, you need to do the following:
- Check your signature: Make sure your API endpoint and method match the required signature format. The Binance API uses a special signature scheme for limit orders.
- Check your account balance: Make sure you have enough funds in your account to place the order.
- Use the correct Torder properties
: Double-check the properties of the Torder object you passed toapi.Order(). Specifically, check that the “Market Price” field matches the desired price.
Here is an updated example with some additional checks:
“` delphinst1.pass
procedure TForm1.Button1Click(Sender: …
begin
// Set the 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 balance: integer;
if api . GetBalance ( ‘ ETH ‘ , ‘ usdt ‘ , balance , nil , nil ) then
writeln(‘The account balance is valid.’);
else
writeln(‘Error getting account balance:’, api.GetBalanceError);
end;
// Create a new order
var order : Order ;
if order.Symbol = ‘BTC/USDT’ then
order.Page: = order.Buy;
order . Quantity : = 1 ;
order . MarketPrice : = float64 ( 1000.00 ); // Assume a market price of $10,000
order . PricingFee : = float 64 ( 10.00 ); // Assume a 10% fee
order . SellFee : = float 64 ( 20.00 ); // Assume a 20% fee
// Attempt to place an order
if api.Order(‘limit’,’buy’,order) then
writeln(‘Order successfully placed!’);
else
writeln(‘Error placing order:’, api.GetBalanceError);
end;
else
writeln(‘Invalid symbol: ‘, sequence.
