[Python] Authentication Failure on Crypto.com exchange API request Python

I am trying to test a basic trading script on Crypto.com's exchange and I keep getting this message.

API Response: {'code': 40101, 'message': 'Authentication failure'} Buy Order Response: {'code': 40101, 'message': 'Authentication failure'}

I have tried creating a few new API Keys and ensuring I am copying them over exactly and I am still getting the same error. I think there's something wrong with my digital signature, but I am not sure what it is.

I found this post where there was a somewhat similar issue, but I was not able to figure out my issue from reading it.

www.crypto.com authenticating, python HMAC-SHA256

Here is my code with my API Keys removed.

import requests
import hmac
import hashlib
import json
from datetime import datetime, timedelta

# Replace with your Crypto.com API credentials
API_KEY = "MY_API_KEY"
API_SECRET = "MY_API_SECRET"
BASE_URL = "https://api.crypto.com/exchange/v1"
SYMBOL = "BTC_USDT"
BUY_AMOUNT = 0.00001 # Adjust according to your trading strategy, 0.00002 min order qty
SELL_THRESHOLD = 1.005 # 0.5% increase
last_buy_price = None # Store the last buy price


def generate_signature(payload: dict) -> str:
"""Generates HMAC signature for authentication."""
message = json.dumps(payload, separators=(',', ':'), sort_keys=True)
return hmac.new(API_SECRET.encode(), message.encode(), hashlib.sha256).hexdigest()


def get_ticker():
"""Fetches the latest ticker information."""
endpoint = f"{BASE_URL}/public/get-tickers"
params = {"instrument_name": SYMBOL}
response = requests.get(endpoint, params=params)
data = response.json()

if "result" in data and "data" in data["result"]:
ticker_data = data["result"]["data"]
if isinstance(ticker_data, list):
return ticker_data[0] # Extract the first item if it's a list
return ticker_data
else:
raise ValueError("Unexpected API response structure: " + str(data))


def place_buy_order():
"""Places a buy order for BTC."""
global last_buy_price
endpoint = f"{BASE_URL}/private/create-order"
timestamp = int(time.time() * 1000)
ticker_data = get_ticker()

# Ensure price precision (Crypto.com may require specific decimal places)
buy_price = str(round(float(ticker_data["a"]), 2)) # Convert price to string with 2 decimal places
buy_amount = str(format(BUY_AMOUNT,'f')) # Ensure minimum order quantity and convert to type string

params = {
"instrument_name": SYMBOL,
"price": buy_price,
"quantity": buy_amount,
"side": "BUY",
"type": "LIMIT"
}

payload = {
"api_key": API_KEY,
"id": timestamp,
"method": "private/create-order",
"params": params,
"nonce": timestamp
}
payload["sig"] = generate_signature(payload)
headers = {"Content-Type": "application/json"}

# Debugging: Print request payload
print("Payload being sent:", json.dumps(payload, indent=2))

response = requests.post(endpoint, json=payload, headers=headers)
response_data = response.json()

print("API Response:", response.json())

if response.status_code == 200 and response_data.get("code") == 0:
last_buy_price = float(buy_price) # Update last buy price

return response_data


def place_sell_order():
"""Places a sell order for BTC."""
endpoint = f"{BASE_URL}/private/create-order"
timestamp = int(time.time() * 1000)
ticker_data = get_ticker()

# Ensure price precision (Crypto.com may require specific decimal places)
sell_price = str(round(float(ticker_data["a"]), 2)) # Adjust precision if needed
sell_amount = str(format(BUY_AMOUNT,'f')) # Ensure minimum order quantity and convert to type string

params = {
"instrument_name": SYMBOL,
"price": sell_price,
"quantity": sell_amount,
"side": "SELL",
"type": "LIMIT"
}

payload = {
"api_key": API_KEY,
"id": timestamp,
"method": "private/create-order",
"params": params,
"nonce": timestamp
}
payload["sig"] = generate_signature(payload)
headers = {"Content-Type": "application/json"}

# Debugging: Print request payload
print("Payload being sent:", json.dumps(payload, indent=2))

response = requests.post(endpoint, json=payload, headers=headers)
response_data = response.json()

print("API Response:", response.json())

return response_data


def check_price_drop():
"""Checks if BTC price dropped more than 0.25% in the last 24 hours."""
price_data = get_ticker()

if isinstance(price_data, list):
price_data = price_data[0] # If it's a list, take the first element

current_price = float(price_data["a"])
high_price_24h = float(price_data["h"])
drop_percentage = (high_price_24h - current_price) / high_price_24h * 100
return drop_percentage >= 0.25


def check_price_rise():
"""Checks if BTC price increased more than 0.5% above the last buy price."""
global last_buy_price
if last_buy_price is None:
return False

price_data = get_ticker()
if isinstance(price_data, list):
price_data = price_data[0]

current_price = float(price_data["a"])
return current_price >= last_buy_price * SELL_THRESHOLD


if __name__ == "__main__":
while True:
try:
if check_price_drop():
print("Price dropped more than 0.25%! Placing buy order...")
order_response = place_buy_order()
print("Buy Order Response:", order_response)
elif check_price_rise():
print("Price increased 0.5% above last buy price! Placing sell order...")
order_response = place_sell_order()
print("Sell Order Response:", order_response)
else:
print("No significant price movement detected. Checking again in 5 minutes.")
except Exception as e:
print("Error:", e)

time.sleep(300) # Check every 5 minutes

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