KuCoin API Python下单"无效签名"错误深度解析与解决方案

signature = base64.b64encode(
    hmac.new(api_secret.encode('utf-8'), str_to_sign.encode('utf-8'), hashlib.sha256).digest())
passphrase = base64.b64encode(
    hmac.new(api_secret.encode('utf-8'), api_passphrase.encode('utf-8'), hashlib.sha256).digest())
# headers中直接使用signature和passphrase，它们是bytes类型
headers = {
    "KC-API-SIGN": signature,
    "KC-API-PASSPHRASE": passphrase,
    # ... 其他头部
}

signature_bytes = hmac.new(api_secret.encode('utf-8'), str_to_sign.encode('utf-8'), hashlib.sha256).digest()
signature = base64.b64encode(signature_bytes).decode('utf-8')

passphrase_bytes = hmac.new(api_secret.encode('utf-8'), api_passphrase.encode('utf-8'), hashlib.sha256).digest()
passphrase = base64.b64encode(passphrase_bytes).decode('utf-8')

headers = {
    "KC-API-SIGN": signature,
    "KC-API-PASSPHRASE": passphrase,
    # ... 其他头部
}

response = requests.request('post', url, headers=headers, params=params)

response = requests.request('post', url, headers=headers, json=params)

import base64
import hashlib
import hmac
import json
import time

import requests

# 替换为您的实际API凭证
api_key = 'YOUR_KUCOIN_API_KEY'
api_secret = 'YOUR_KUCOIN_API_SECRET'
api_passphrase = 'YOUR_KUCOIN_API_PASSPHRASE'

# KuCoin API下单URL
url = 'https://api.kucoin.com/api/v1/orders'
request_path = '/api/v1/orders' # 用于签名

# 生成当前时间戳（毫秒）
now = int(time.time() * 1000)

# 订单参数
params = {
    "clientOid": f"my_order_{now}", # 客户端订单ID，必须唯一
    "side": "BUY",                 # 交易方向：BUY 或 SELL
    "symbol": "BTC-USDT",          # 交易对
    "type": "limit",               # 订单类型：limit 或 market
    "size": "0.001",               # 购买数量
    "price": "41220.9",            # 购买价格
    "postOnly": "true"             # 是否为只挂单
}

# 将订单参数转换为JSON字符串，用于签名
json_params = json.dumps(params)

# 构建签名字符串
# 格式: timestamp + method + request_path + body (如果POST/PUT请求有body)
str_to_sign = str(now) + 'POST' + request_path + json_params
print(f"Signature string: {str_to_sign}")

# 生成签名
signature_bytes = hmac.new(api_secret.encode('utf-8'), str_to_sign.encode('utf-8'), hashlib.sha256).digest()
signature = base64.b64encode(signature_bytes).decode('utf-8') # 转换为UTF-8字符串

# 生成密码短语签名
passphrase_bytes = hmac.new(api_secret.encode('utf-8'), api_passphrase.encode('utf-8'), hashlib.sha256).digest()
passphrase = base64.b64encode(passphrase_bytes).decode('utf-8') # 转换为UTF-8字符串

# 构建HTTP请求头
headers = {
    "KC-API-SIGN": signature,
    "KC-API-TIMESTAMP": str(now),
    "KC-API-KEY": api_key,
    "KC-API-PASSPHRASE": passphrase,
    "KC-API-KEY-VERSION": "2", # KuCoin API V2版本
    "Content-Type": "application/json" # 明确指定内容类型
}

# 发送POST请求
# 注意：使用json=params传递请求体
response = requests.request('post', url, headers=headers, json=params)

# 打印响应结果
print(f"HTTP Status Code: {response.status_code}")
print(f"Response JSON: {response.json()}")

# 检查是否成功
if response.status_code == 200 and response.json().get('code') == '200000':
    print("订单创建成功！")
else:
    print("订单创建失败。")
    print(f"错误信息: {response.json().get('msg', '未知错误')}")