Develop Reference

Why I can't make a Binance order using c# with the official Binance REST API?

I am new to StackOverflow but I heard that there are awesome and helpful people who can help me out. 😉
My mission:
To find a way to make a trade calling the Binance REST API using c#
Without dlls, using my own code (for speed update)
Now I using the Binance.API package but my bot needs to be a bit faster as its speed is not enough.
Also, it would be a great thing to be able to do that without any external sources like dlls. Isn't it? 😎
What I tried:
Success: I can call the public API without problem with "WebRequest" and which there is no need authentication.
WebRequest webrequest = WebRequest.Create("https://api.binance.com/api/v3/ticker/price?symbol=BTCUSDT");
WebResponse Response = webrequest.GetResponse();
StreamReader reader = new StreamReader(Response.GetResponseStream());
MessageBox.Show(reader.ReadToEnd());
Success: I can call the REST API without problem with "WebRequest" and which there is need authentication. BUT only the account information.
string dataQueryString = "recvWindow=15000&timestamp=" + Math.Round(Convert.ToDecimal(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalMilliseconds), 0).ToString();
WebRequest webrequest = WebRequest.Create("https://api.binance.com/api/v3/account?" + dataQueryString + "&signature=" + BitConverter.ToString(new HMACSHA256(Encoding.ASCII.GetBytes(tempAPI_Secret)).ComputeHash(Encoding.ASCII.GetBytes(dataQueryString))).Replace("-", string.Empty).ToLower());
webrequest.Method = "GET";
webrequest.Headers.Add("X-MBX-APIKEY", tempAPI_Key);
WebResponse Response = webrequest.GetResponse();
StreamReader reader = new StreamReader(Response.GetResponseStream());
string response = reader.ReadToEnd();
reader.Close();
Response.Close();
!!! THE PROBLEM !!! I can't call the ORDER REST API with "WebRequest" and which there is need authentication. I tried the code below. (It is called the same way as the account information but with the type of POST and of course with the plus parameters needed)
string dataQueryString = "symbol=BTCUSDT&side=SELL&type=LIMIT&quantity=0.00039&price=38878&newOrderRespType=RESULT&recvWindow=15000&timestamp=" + Math.Round(Convert.ToDecimal(DateTime.UtcNow.Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalMilliseconds), 0).ToString();
WebRequest webrequest = WebRequest.Create("https://api.binance.com/api/v3/account?" + dataQueryString + "&signature=" + BitConverter.ToString(new HMACSHA256(Encoding.ASCII.GetBytes(tempAPI_Secret)).ComputeHash(Encoding.ASCII.GetBytes(dataQueryString))).Replace("-", string.Empty).ToLower());
webrequest.Method = "POST";
webrequest.Headers.Add("X-MBX-APIKEY", tempAPI_Key);
WebResponse Response = webrequest.GetResponse();
StreamReader reader = new StreamReader(Response.GetResponseStream());
string response = reader.ReadToEnd();
reader.Close();
Response.Close();
The returned ERROR code:
'The remote server returned an error: (400) Bad Request.'
I can't understand why this is not working. (I tried to do the order with exactly these parameters from the web client manually and it was successful)
I checked these possible problems:
I have enough funds on my spot account
I trying to sell more than the minimum trade amount is
There is the official Binance REST API documentation: HERE
I tried to google it but I couldn't find the solution even here.
Thanks to read it and if you could help me I would really appreciate it. 🙏
If something is not clear please ask it, I will answer!

I was literarly doing the same thing you are a few days ago, except I was using python. I'm also glad to see I'm not the only one who likes coding from scratch.
My solution was to leave the url as is https://api.binance.com/api/v3/account and instead of attaching my order parameters symbol=BTCUSD&side=BUY&etc... onto the url I had to instead encode and send that data through the data parameter of python's built in function urllib.request.Request(url, data, headers)
I don't know C# that well so I wouldn't know how to translate my python code to C#, but I did find this doc link that provides an example on how to send data using a POST request. You could also take a look at my question and answer as another example.

<form action="./"> and working out params for web scraping

I'm trying to do some web scraping from a simple form in C#.
My issue is trying to figure out the action to post to and how to work out the post params.
The form I am trying to submit has:
<form method="post" action="./"
As the page sits at www.foobar.com I am creating a WebRequest object in my C# code and posting to this address.
The other issue with this is that I am not sure of the post values as the inputs only have ids not names:
<input name="ctl00$MainContent$txtSearchName" type="text" maxlength="8" id="MainContent_txtSearchName" class="input-large input-upper">
So I read this: c# - programmatically form fill and submit login, amongst others and my code looks like this:
var httpRequest = WebRequest.Create("https://www.foobar.com/");
var values = "SearchName=Foo&SearchLastName=Bar";
byte[] send = Encoding.Default.GetBytes(values);
httpRequest.Method = "POST";
httpRequest.ContentType = "application/x-www-form-urlencoded";
httpRequest.ContentLength = send.Length;
Stream sout = httpRequest.GetRequestStream();
sout.Write(send, 0, send.Length);
sout.Flush();
sout.Close();
WebResponse res = httpRequest.GetResponse();
StreamReader sr = new StreamReader(res.GetResponseStream());
string returnvalue = sr.ReadToEnd();
File.WriteAllText(#"C:\src\test.html", returnvalue);
However, the resulting html page that is created does not show the search results, it shows the initial search form.
I am assuming the post is failing. My questions are around post I am making.
Does action="./" mean it posts back to the same page?
Do I need to submit all the form values (or can I get away with only submitting one or two)?
Is there any way to infer what the correct post parameter names are from the form?
Or am I missing something completely about web scraping and submitting forms in server side code?

What I would suggest is not doing all of this work manually, but letting your computer take a bit of the workload. You can use a tool such as Fiddler and the Fiddler Request To Code Plugin in order to programmatically generate the C# code for duplicating the web request. You can then modify it to take whatever dynamic input you may need.
If this isn't the route you'd like to take, you should make sure that you are requesting this data with the correct cookies (if applicable) and that you are supplying ALL POST data, no matter how menial it may seem.

Web Server Does Not Allow Using Post Method

I want to connect a website with my user id and password and get my datas from website and store them in a text file, but I get error 405 that Method Not Allowed. Can somebody help me to figure out this?
Here is the html code of webserver:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>blablbablablabl</title>
</head>
<script type="text/javascript">
function login() {
setTimeout('window.close()',1000);
}
</script>
<body>
<div><h3>blablablaasdasd</h3><form onSubmit="javascript:login();" style='margin- top:10px;' id='loginPageForm' action='http://website.com' method='post' target='_blank'
<div>
<input name='t:ac' type='hidden' value='$002f$002website.com$002fclient$002fdefault$002fsearch$002faccount$003f' />
<input name='t:formdata' type='hidden' value='H4sIAAAAAAAAAJWQv0oDQRDGx4NAMJ1gEURstN2zMI02BkEQDgkc1mFvb7xs2Ntdd/ZMbKx8CRufQKz0CVLY+Q4+gI2FlYV7J6Lg/274mJnv932XD9CarMAyIXdiFA+4d0YnppB6czysCJ3mJZKDnnEF45aLETLPLZJ3Jz0mjEMlM5ZxQtbPgsiF35Wo8tUUfWXXDmad+8Xb5wjmEugIo8N3tR8+elhIxvyYx4rrIk69k7rYmloP8++uf8Hq/xdr4IxAorTKSkkkjZ5d5RuHTxd3EcDUfmtpOdHEuJyO4BSgwXyTfr2pT1qTJeh+sUU1hw9Btn8MIkxpjUbtiTXk/nOO8/Sxe3N9thNBlEBbKBm29xrvunpUWAahrr6R6qrbr+bD9Q/jCx9ggTUPAgAA' /></div>
<label for='identity'>Card Number:</label><div><input type='text' name='j_username' /</div>
<div style='clear:both;'></div>
<label for='password'>Password:</label>
<div><input name='j_password' type='password' class='pass' value='' /><input type='submit' value='Login' /></div></form></div>
</body>
</html>
Here is the C# code that I am trying to reach server.
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://website.com/file.html");
request.AllowAutoRedirect = true;
request.Timeout = 10000; // timeout 10s
request.Method = "POST";
String formContent = "t:ac=$002f$002website.com$002fclient$002fdefault$002fsearch$002faccount$003f&t:formdata=H4sIAAAAAAAAAJWQv0oDQRDGx4NAMJ1gEURstN2zMI02BkEQDgkc1mFvb7xs2Ntdd/ZMbKx8CRufQKz0CVLY+Q4+gI2FlYV7J6Lg/274mJnv932XD9CarMAyIXdiFA+4d0YnppB6czysCJ3mJZKDnnEF45aLETLPLZJ3Jz0mjEMlM5ZxQtbPgsiF35Wo8tUUfWXXDmad+8Xb5wjmEugIo8N3tR8+elhIxvyYx4rrIk69k7rYmloP8++uf8Hq/xdr4IxAorTKSkkkjZ5d5RuHTxd3EcDUfmtpOdHEuJyO4BSgwXyTfr2pT1qTJeh+sUU1hw9Btn8MIkxpjUbtiTXk/nOO8/Sxe3N9thNBlEBbKBm29xrvunpUWAahrr6R6qrbr+bD9Q/jCx9ggTUPAgAA&j_username=johndoe0&j_password=12345";
byte[] byteArray = Encoding.UTF8.GetBytes(formContent);
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = byteArray.Length;
Stream dataStream = request.GetRequestStream();
dataStream.Write(byteArray, 0, byteArray.Length);
dataStream.Close();
// Get the response ...
WebResponse response;
response = (HttpWebResponse)request.GetResponse();//ERROR OCCURS HERE!!!
dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
richTextBox1.AppendText(HttpUtility.UrlDecode(reader.ReadToEnd()));
reader.Close();
dataStream.Close();
response.Close();
EDIT: Problem solved, found another URL in that website that allows POST method.

#GSiry's solution is probably the way to go if you control the server you fetch data from.
Otherwise, the issue is about adjusting your request to whatever HTTP method the remote server accepts: Method Not Allowed is supposed to mean that server won't take some particular methods while accepting others, and for good reasons. See more on request safety and idempotence.
What happens if you use GET instead of POST?
EDIT: Assuming you are really POSTing to the same web URL from both the HTML form and your C# request (which does not seem to be the case anyway), the reason why it behaves differently is not obvious and is in fact server implementation-dependent. Which means we can only do guesswork (for example, it might not like the user agent it gets (or lack thereof) from your C# code.
Anyway, I stand by the advice of using GET. There seems to be no reason at all to issue a POST request, since you don't intend to modify website.com/file.html, which is the stated purpose of POST method.
EDIT2: Its not necessary to use POST for a login per se. HTTP authentication can be performed through form parameters, through HTTP request headers or through the own authoritative part of the domain name (http://username:password#website.com/your_file.html). But this depends exclusively on the concrete server implementation.
If you can't access the server logs, I'm afraid you're in for some trial-and-error session. Start by mimicking the browser's request exactly. Firebug, Chrome's or Safari's developer console will be your friends to see exactly what headers are being passed along with the browser request so that the POST method is allowed.
On a side note, what you should be using for authentication procedure is SSL/TLS (https://...)

If you are using MVC, it might be as simple as adding the
[HttpPost]
attribute to the controller function that accepts your post request

If you're trying to access a WebService add following section to target's site Web.config under System.Web:
<webServices>
<protocols>
<add name="HttpPost"/>
</protocols>
</webServices>

Logging into website programmatically with C# and WebRequest class

I'm trying to login to a website using C# and the WebRequest class. This is the code I wrote up last night to send POST data to a web page:
public string login(string URL, string postData)
{
Stream webpageStream;
WebResponse webpageResponse;
StreamReader webpageReader;
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
_webRequest = WebRequest.Create(URL);
_webRequest.Method = "POST";
_webRequest.ContentType = "application/x-www-form-urlencoded";
_webRequest.ContentLength = byteArray.Length;
webpageStream = _webRequest.GetRequestStream();
webpageStream.Write(byteArray, 0, byteArray.Length);
webpageResponse = _webRequest.GetResponse();
webpageStream = webpageResponse.GetResponseStream();
webpageReader = new StreamReader(webpageStream);
string responseFromServer = webpageReader.ReadToEnd();
webpageReader.Close();
webpageStream.Close();
webpageResponse.Close();
return responseFromServer;
}
and it works fine, but I have no idea how I can modify it to send POST data to a login script and then save a cookie(?) and log in.
I have looked at my network transfers using Firebug on the websites login page and it is sending POST data to a URL that looks like this:
accountName=myemail%40gmail.com&password=mypassword&persistLogin=on&app=com-sc2
As far as I'm aware, to be able to use my account with this website in my C# app I need to save the cookie that the web server sends, and then use it on every request? Is this right? Or can I get away with no cookie at all?
Any help is greatly apprecated, thanks! :)

The login process depends on the concrete web site. If it uses cookies, you need to use them.
I recommend to use Firefox with some http-headers watching plugin to look inside headers how they are sent to your particular web site, and then implement it the same way in C#. I answered very similar question the day before yesterday, including example with cookies. Look here.

I've found more luck using the HtmlElement class to manipulate around websites.
Here is cross post to an example of how logging in through code would work (provided you're using a WebBrowser Control)

HTTP Post in C# console app doesn't return the same thing as a browser request

I have a C# console app (.NET 2.0 framework) that does an HTTP post using the following code:
StringBuilder postData = new StringBuilder(100);
postData.Append("post.php?");
postData.Append("Key1=");
postData.Append(val1);
postData.Append("&Key2=");
postData.Append(val2);
byte[] dataArray = Encoding.UTF8.GetBytes(postData.ToString());
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create("http://example.com/");
httpRequest.Method = "POST";
httpRequest.ContentType = "application/x-www-form-urlencoded";
httpRequest.ContentLength = dataArray.Length;
Stream requestStream = httpRequest.GetRequestStream();
requestStream.Write(dataArray, 0, dataArray.Length);
requestStream.Flush();
requestStream.Close();
HttpWebResponse webResponse = (HttpWebResponse)httpRequest.GetResponse();
if (httpRequest.HaveResponse == true) {
Stream responseStream = webResponse.GetResponseStream();
StreamReader responseReader = new System.IO.StreamReader(responseStream, Encoding.UTF8);
String responseString = responseReader.ReadToEnd();
}
The outputs from this are:
webResponse.ContentLength = -1
webResponse.ContentType = text/html
webResponse.ContentEncoding is blank
The responseString is HTML with a title and body.
However, if I post the same URL into a browser (http://example.com/post.php?Key1=some_value&Key2=some_other_value), I get a small XML snippet like:
<?xml version="1.0" ?>
<RESPONSE RESULT="SUCCESS"/>
with none of the same HTML as in the application. Why are the responses so different? I need to parse the returned result which I am not getting in the HTML. Do I have to change how I do the post in the application? I don't have control over the server side code that accepts the post.

If you are indeed supposed to use the POST HTTP method, you have a couple things wrong. First, this line:
postData.Append("post.php?");
is incorrect. You want to post to post.php, you don't want post the value "post.php?" to the page. Just remove this line entirely.
This piece:
... WebRequest.Create("http://example.com/");
needs post.php added to it, so...
... WebRequest.Create("http://example.com/post.php");
Again this is assuming you are actually supposed to be POSTing to the specified page instead of GETing. If you are supposed to be using GET, then the other answers already supplied apply.

You'll want to get an HTTP sniffer tool like Fiddler and compare the headers that are being sent from your app to the ones being sent by the browser. There will be something different that is causing the server to return a different response. When you tweak your app to send the same thing browser is sending you should get the same response. (It could be user-agent, cookies, anything, but something is surely different.)

I've seen this in the past.
When you run from a browser, the "User-Agent" in the header is "Mozilla ...".
When you run from a program, it's different and generally specific to the language used.

I think you need to use a GET request, instead of POST. If the url you're using has querystring values (like ?Key1=some_value&Key2=some_other_value) then it's expecting a GET. Instead of adding post values to your webrequest, just put this data in the querystring.
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create("http://example.com/?val1=" + val1 + "&val2=" + val2);
httpRequest.Method = "GET";
httpRequest.ContentType = "application/x-www-form-urlencoded";
....
So, the result you're getting is different when you POST the data from your app because the server-side code has a different output when it can't read the data it's expecting in the querystring.

In your code you a specify the POST method which sends the data to the PHP file without putting the data in the web address. When you put the information in the address bar, that is not the POST method, that is the GET method. The name may be confusing, but GET just means that the data is being sent to the PHP file through the web address, instead of behind the scenes, not that it is supposed to get any information. When you put the address in the browser it is using a GET.
Create a simple html form and specify POST as the method and your url as the action. You will see that the information is sent without appearing in the address bar.
Then do the same thing but specify GET. You will see the information you sent in the address bar.

I believe the problem has something to do with the way your headers are set up for the WebRequest.
I have seen strange cases where attempting to simulate a browser by changing headers in the request makes a difference to the server.
The short answer is that your console application is not a web browser and the web server of example.com is expecting to interact with a browser.
You might also consider changing the ContentType to be "multipart/form-data".
What I find odd is that you are essentially posting nothing. The work is being done by the query string. Therefore, you probably should be using a GET instead of a POST.

Is the form expecting a cookie? That is another possible reason why it works in the browser and not from the console app.