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# 请求签名

<h2 id="request-format">
  请求格式
</h2>

| 位置     | 字段          | 必填    | 说明                         |
| ------ | ----------- | ----- | -------------------------- |
| Header | `X-API-KEY` | 是     | 创建 API Key 返回的 `apiKey`    |
| Query  | `timestamp` | 是     | 毫秒级 Unix 时间戳               |
| Query  | `signature` | 是     | HMAC-SHA256 签名结果，hex 小写字符串 |
| Body   | JSON        | 按接口要求 | `POST / PUT / DELETE` 请求体  |

<h2 id="signature-payload">
  签名载荷
</h2>

```
payload = queryStringWithoutSignature + requestBody
signature = HMAC-SHA256(apiSecret, payload)
```

关键规则：

* `timestamp` 使用毫秒级 Unix 时间戳，服务端容差窗口为 ±10 秒。
* `signature` 放在 URL query string 中，但不参与签名。
* 服务端按原始 query string 去掉 `signature` 后验签，不会重新排序 query 参数。
* 客户端签名时使用的 query 参数顺序必须和实际请求 URL 保持一致。
* 有请求体时，签名使用的 JSON 字符串必须和实际发送 body 完全一致。
* 订单相关路径会做签名去重，同一个签名在短时间内重复使用会返回 `Signature replay detected`。

<h2 id="server-time">
  服务端时间
</h2>

```http
GET /v1/time
```

响应示例：

```json
{
  "code": 0,
  "message": "success",
  "data": {
    "timestamp": 1780473256,
    "timestampMs": 1780473256708,
    "iso": "2026-06-03T07:54:16Z",
    "timezone": "UTC"
  },
  "requestId": "req-7cad3113"
}
```

建议客户端计算 `timeOffsetMs = serverTimestampMs - localTimestampMs`，后续签名请求使用 `timestamp = nowMs + timeOffsetMs`。如果返回 `Timestamp outside of tolerance window`，应立即重新校时并重新签名。

<h2 id="get-signing-example">
  GET 签名示例
</h2>

实际请求：

```
GET /v1/private/order/current?symbol=BTCUSDT&timestamp=1772710377808&signature=...
```

签名载荷：

```
symbol=BTCUSDT&timestamp=1772710377808
```

<h2 id="post-signing-example">
  POST 签名示例
</h2>

实际请求：

```
POST /v1/private/order/place?timestamp=1772710377808&signature=...
```

请求体：

```json
{"symbol":"BTCUSDT","type":"LIMIT","side":"BUY","price":"85000","quantity":"0.1","timeInForce":"GTC","makerOnly":true,"clientOrderId":"ext-1772710377808-001"}
```

签名载荷：

```
timestamp=1772710377808{"symbol":"BTCUSDT","type":"LIMIT","side":"BUY","price":"85000","quantity":"0.1","timeInForce":"GTC","makerOnly":true,"clientOrderId":"ext-1772710377808-001"}
```

<h2 id="python-signing-example">
  Python 签名示例
</h2>

```python
import hashlib
import hmac
import json
import time
from urllib.parse import urlencode

import requests

BASE_URL = "https://api.6mm.com"
API_KEY = "YOUR_API_KEY"
API_SECRET = "YOUR_API_SECRET"
TIME_OFFSET_MS = 0

def sign(payload: str) -> str:
    return hmac.new(
        API_SECRET.encode("utf-8"),
        payload.encode("utf-8"),
        hashlib.sha256,
    ).hexdigest()

def sync_time_offset():
    global TIME_OFFSET_MS
    before = int(time.time() * 1000)
    resp = requests.get(f"{BASE_URL}/v1/time", timeout=5)
    after = int(time.time() * 1000)
    resp.raise_for_status()

    server_ts = int(resp.json()["data"]["timestampMs"])
    local_midpoint = (before + after) // 2
    TIME_OFFSET_MS = server_ts - local_midpoint

def signed_request(method: str, path: str, params=None, body=None):
    params = dict(params or {})
    params["timestamp"] = str(int(time.time() * 1000) + TIME_OFFSET_MS)

    query_string = urlencode(params)
    body_string = ""
    if body is not None:
        body_string = json.dumps(body, separators=(",", ":"), ensure_ascii=False)

    signature = sign(query_string + body_string)
    url = f"{BASE_URL}{path}?{query_string}&signature={signature}"
    headers = {
        "X-API-KEY": API_KEY,
        "Content-Type": "application/json",
    }
    resp = requests.request(method, url, headers=headers, data=body_string if body is not None else None, timeout=10)
    resp.raise_for_status()
    return resp.json()

sync_time_offset()
print(signed_request("GET", "/v1/private/order/current", {"symbol": "BTCUSDT"}))
```