JSN API MATLAB POST request

I have problems making a request with a json file in Matlab (using JSONlab)

the request has to be:

$ body=$(cat << EOF
{
  "order": {
    "units": "100", 
    "instrument": "EUR_USD", 
    "timeInForce": "FOK", 
    "type": "MARKET", 
    "positionFill": "DEFAULT"
  }
}
EOF
)

curl \
  -X POST \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer <AUTHENTICATION TOKEN>" \
  -d "$body" \
  "https://api-fxtrade.oanda.com/v3/accounts/<ACCOUNT>/orders"$

then I do this in Matlab

Auth_Header = http_createHeader('Authorization',['Bearer <AUTHENTICATION TOKEN>']);
Body = ['&units=','100','&instrument=','EUR_USD','&timeInForce=','FOK','&type=','MARKET','&positionFill=','DEFAULT'];

RawOrderInfo = loadjson(urlread2('https://api-fxtrade.oanda.com/v3/accounts/<ACCOUNT>/orders',...
'POST', Body ,Auth_Header)

I know that something with my body is wrong. Can anyone help me and tell me whats wrong with my loadjson request ?

I get a server response: errorMessage: 'Unsupported ContentType: application/x-www-form-urlencoded'

Thank you!

Answer 1

[Kojiro Saito]

You're also using urlread2?

I think you should add "Content-Type" header.

Auth_Header = http_createHeader({'Authorization', 'Content-Type'} ,{['Bearer <AUTHENTICATION TOKEN>'], 'application/json'});

Also, if you use MATLAB R2015a or later, it's better to use webwrite.

url = 'https://api-fxtrade.oanda.com/v3/accounts/<ACCOUNT>/orders';
options = weboptions('RequestMethod','post', 'MediaType','application/json');
Body = struct('units', '100', ... 
          'instrument', 'EUR_USD', ...
          'timeInForce', 'FOK', ...
          'type', 'MARKET', ...
          'positionFill', 'DEFAULT');
Body = struct('order', Body);
response = webwrite(url, Body, options);

Hope it works.

[Noah van Hartesveldt]

Hello,

This solution seems to work, except now returns the error of unauthorized, since I was not sure where to add in the authorization bearer token header. Is there a way to add in this type of header using webwrite?

Thanks,

Noah

[Abolfazl Nejatian]

Dear Kojiro,

I have a similare question with diffrent goal.

I need to send some photos to the Telegram API.

here is the document of telegram for sending photos,

https://core.telegram.org/bots/api#sendphoto

and here is the python example of my goal

import requests
import json
bot_token = 'BOT TOKEN'
chat_id = "CHAT ID"
file = r"C:\Users\name\OneDrive\Desktop\Capture.PNG"
files = {
    'photo': open(file, 'rb')
}
message = ('https://api.telegram.org/bot'+ bot_token + '/sendPhoto?chat_id=' 
           + chat_id)
send = requests.post(message, files = files)

the problem is i dont know how to convert dictionary in matlab.

if you could reform this python code to the matlab, I will appreciate your help.

thank in advance for your time

[Kojiro Saito]

@Abolfazl Nejatian

I've just answered your question.

Please see this.

[Abolfazl Nejatian]

Dear Kojiro

Thank you for your help.

another thing I really need your help is sending a request for Binance API.

well, I think it is not only my question because it many times asked around the net in the Matlab community.

in Binance there are two API, one for the real trade and another for the test trade(demo account).

here is my Matlab code,

unfortunately, it doesn't work. with this piece of code, I try to place a buy or sell order but a bad type result sends back.

% Set up authentication:
APIKey    = '12a2fff338b41101ed886dd1c0ef4f35e96fe0233c23616daed4f2dbd1389526';
APISecret = '3d52b16aa7a0c6cd12fd11e09a955967cfeb839ff729357a0ca272351da75873';


symbol = 'BTCUSDT';
type   = 'limit';      % or 'market'
side   = 'sell';       % or 'buy'
amount =  1.0;
price  =  60540;    % or None

options = weboptions('RequestMethod',apiMethod, 'MediaType','application/json');
Body = struct('symbol', symbol, ... 
          'type', type, ...
          'side', side, ...
          'amount', char(num2str(amount)), ...
          'price', char(num2str(price)), ...
          'APIKey', APIKey,...
          'APISecret', APISecret);
      

webaddress = 'https://testnet.binance.vision/api/v3/order/';
response = webwrite(webaddress, Body, options);

and here is the Python code

def place_trade(symbol, side, order_type, quantity):

    # Setup header with API_KEY
    headers = {'X-MBX-APIKEY': settings.API_KEY}

    # Params require symbol, side, type, quantity and timestamp (for market orders)
    params = {
        'symbol': symbol,
        'side': side,
        'type': order_type,
        'quantity': quantity,
        'timestamp': int(time.time() * 1000)
    }

    # Encode params into url
    url = 'https://api.binance.us/api/v3/order/test?' + urllib.parse.urlencode(params)

    # Create a HMAC SHA256 signature
    secret = bytes(settings.SECRET_KEY.encode('utf-8'))
    signature = hmac.new(secret, urllib.parse.urlencode(params).encode('utf-8'), hashlib.sha256).hexdigest()

    # Add signature to url
    url += f'&signature={signature}'

    # Encode params
    data = urllib.parse.urlencode(params).encode('ascii')

    # Make a POST request
    req = urllib.request.Request(url, data, headers)

    # Open request and convert to string and then to json
    response = urllib.request.urlopen(req)                         # <- line with error
    response_str = response.read().decode('utf-8')
    response_json = json.loads(response_str)

    print(response_json)


place_trade(symbol='BTCUSD', side='BUY', order_type='MARKET', quantity=1)

I greatly appreciate your help.

kind regards,

Abolfazl Nejatian

[Abolfazl Nejatian]

i created a new topic for this question.

if you want you can answer there

https://www.mathworks.com/matlabcentral/answers/836418-binance-buy-or-sell-request

Answer 2

[Elbi Mutluoglu]

curl -XPOST "Content-type: application/json" -d '{ "secret": "your_secret" }' 'https://baseURL/locationHistory/versionNumber/register?key=Your_API_Key'

How can I send this via matlab?

[Kojiro Saito]

Try this.

opts = weboptions('ContentType', 'json');
url = 'https://baseURL/locationHistory/versionNumber/register?key=Your_API_Key';
fieldName = 'secret';
fieldValue = 'your_secret';
response = webwrite(url, fieldName, fieldValue, opts);

Answer 3

[balaji p]

curl "https://api.kite.trade/orders/151220000000000/trades" -H "Authorization:token <key>:<token>"

Can you help with the command?