Change Margin Type

Type: TRADE

Weight: 1

GET /fapi/v1/marginType · POST /fapi/v1/marginType

Read or set the margin type for a symbol. On the FAPI surface only cross margin exists; the endpoints are provided so SDKs that poll them at startup do not mistake a 404 for an auth failure.

GET

GET /fapi/v1/marginType?symbol=BTCUSDT&timestamp=<ms>&signature=<hex>

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

POST

POST /fapi/v1/marginType?timestamp=<ms>&signature=<hex>
Content-Type: application/json
{ "symbol": "BTCUSDT", "marginType": "CROSSED" }

marginType	Result
CROSSED	{ "code": 200, "msg": "success" } (idempotent)
ISOLATED	{ "code": -4046, "msg": "Isolated margin is not supported on the developer fapi. ..." }

Isolated / unified margin is an account-level switch on the native API (POST /api/v1/account/margin-mode, JWT) and is not exposed through /fapi.

Authentication failures (INVALID_API_KEY, API_KEY_DISABLED, IP_NOT_ALLOWED, SIGNATURE_INVALID) apply to every signed endpoint and use Sparky's {"success":false,"error":{...}} envelope; see Error Codes.