Crypto Trading Bot Development — Python Bots for Binance, Bybit and Kraken

import os
import ccxt

exchange = ccxt.binance({
    "apiKey": os.environ["EXCHANGE_API_KEY"],      # never hard-code keys
    "secret": os.environ["EXCHANGE_API_SECRET"],
    "enableRateLimit": True,                       # let CCXT throttle requests
})
# exchange.set_sandbox_mode(True)  # use the exchange testnet where CCXT supports it
exchange.load_markets()

symbol = "BTC/USDT"
last = exchange.fetch_ticker(symbol)["last"]

# Round to the market's precision, otherwise the exchange rejects the order
price  = float(exchange.price_to_precision(symbol, last * 0.99))
amount = float(exchange.amount_to_precision(symbol, 0.001))

try:
    order = exchange.create_limit_buy_order(symbol, amount, price)
    print("Placed:", order["id"], order["status"])
except ccxt.InsufficientFunds as e:
    print("Not enough balance:", e)
except ccxt.InvalidOrder as e:
    print("Rejected by exchange rules:", e)
except ccxt.NetworkError as e:
    print("Network problem, safe to retry after reconciling open orders:", e)