Margin Type

Description

Query or change the margin type for the caller (cross / isolated).

ZTDX fapi runs in cross margin only

The matching engine and unified-margin paths in the /fapi/* (HMAC) namespace only support cross margin. GET always returns marginType=CROSSED. POST accepts marginType=CROSSED (idempotent), and rejects marginType=ISOLATED with -4046. For genuine isolated-mode bookkeeping, use the JWT-authenticated POST /api/v1/account/margin-mode (see Unified Margin docs).

HTTP Request

• Query: GET /fapi/v1/marginType (HMAC SHA256)
• Change: POST /fapi/v1/marginType (HMAC SHA256)

GET Request Parameters

Name	Type	Required	Description
symbol	STRING	NO	Trading pair. If omitted, the symbol field in the response is null.
recvWindow	LONG	NO	Ignored — the server enforces a fixed ±60 second timestamp window regardless of this value.
timestamp	LONG	YES	Timestamp

POST Request Parameters

Name	Type	Required	Description
symbol	STRING	YES	Trading pair
marginType	STRING	YES	CROSSED (idempotent) or ISOLATED (rejected with -4046). Case-insensitive; CROSS is also accepted.
recvWindow	LONG	NO	Ignored — the server enforces a fixed ±60 second timestamp window regardless of this value.
timestamp	LONG	YES	Timestamp

Response Example (GET)

{
  "symbol": "BTCUSDT",
  "marginType": "CROSSED"
}

Response Example (POST, CROSSED)

{
  "code": 200,
  "msg": "success"
}

Errors

Code	Message	Cause
-4046	Isolated margin is not supported on the developer fapi. ...	marginType=ISOLATED.
-1128	Invalid marginType '<value>'. Expected CROSSED or ISOLATED.	Any other value.

Code Examples

curl (query)

API_KEY="your_api_key"
API_SECRET="your_api_secret"
TIMESTAMP=$(date +%s%3N)
QUERY_STRING="symbol=BTCUSDT&timestamp=${TIMESTAMP}"
SIGNATURE=$(echo -n "${QUERY_STRING}" | openssl dgst -sha256 -hmac "${API_SECRET}" | awk '{print $2}')
curl -s -H "X-MBX-APIKEY: ${API_KEY}" \
  "https://api.prex.world/fapi/v1/marginType?${QUERY_STRING}&signature=${SIGNATURE}"

Python

import time, hmac, hashlib, requests

API_KEY = "your_api_key"
API_SECRET = "your_api_secret"
BASE_URL = "https://api.prex.world"

def sign(qs: str) -> str:
    return hmac.new(API_SECRET.encode(), qs.encode(), hashlib.sha256).hexdigest()

# Query margin type
ts = int(time.time() * 1000)
qs = f"symbol=BTCUSDT&timestamp={ts}"
r = requests.get(
    f"{BASE_URL}/fapi/v1/marginType?{qs}&signature={sign(qs)}",
    headers={"X-MBX-APIKEY": API_KEY},
)
print(r.json())  # {"symbol":"BTCUSDT","marginType":"CROSSED"}

# Change margin type (CROSSED is idempotent)
import json
ts = int(time.time() * 1000)
body = json.dumps({"symbol": "BTCUSDT", "marginType": "CROSSED"}, separators=(",", ":"))
qs = f"timestamp={ts}"
r = requests.post(
    f"{BASE_URL}/fapi/v1/marginType?{qs}&signature={sign(qs + body)}",
    data=body,
    headers={"X-MBX-APIKEY": API_KEY, "Content-Type": "application/json"},
)
print(r.json())  # {"code":200,"msg":"success"}