StocksExchange API Integration

stocks_exchange.rb

require 'openssl'
require 'httparty'

url = "https://stocks.exchange/api2"

api_key = "your_api_key"
api_secret = "your_api_secret"

nonce = Time.now.to_i
method = "GetInfo"

data = {"method": method, "nonce": nonce}
signdata = "method=#{method}&nonce=#{nonce}"

sign = OpenSSL::HMAC.hexdigest("SHA512", api_secret, signdata)

response = HTTParty.post(url,
  :body => data.to_json,
  :headers => { 'Sign' => sign, 'Key' => api_key })

require 'openssl'
require 'httparty'

api_key = "your_api_key"
api_secret = "your_api_secret"

nonce = Time.now.to_i
method = "GetInfo"

url = "https://stocks.exchange/api2?method=#{method}&nonce=#{nonce}"
data = {method: method, nonce: nonce}
sign = OpenSSL::HMAC.hexdigest(OpenSSL::Digest.new('sha512'), api_secret, data.to_s)

response = HTTParty.post(url, body: data.to_s, headers: {
    'Sign' => sign,
    'Key' => api_key
})

Your code not correct working.
Please checked this code

# base url is changed. use this:
url = "https://app.stex.com/api2?method=#{method}&nonce=#{nonce}"