Method - assign

Changes the linked symbol for a given link color slot. It does not open a new chart or instrument set — use open (or open_aggregated) for that.

Typical flow: if you need to change the linked symbol for an existing set of instruments, assign that slot; if you need to open a new set of instruments, open.

assign is for switching what linked panels follow (e.g. Red/Green/Blue links). Having several linked views open (Spot/Futures) may make the result easier to see, but is not required for the call to take effect.

Request

Field	Type	Required	Description
method	string	Yes	Must be "assign".
exchange	number	Yes	Exchange id. See Reference.
market_type	number	Yes	0 = Spot, 1 = Futures.
symbol	string	Yes	Display symbol, e.g. TRXUSDT. See Reference.
linking_type	number or string	Yes	Link color slot (e.g. 2 or "Link1"). See Reference and Link color.

Example

{
  "method": "assign",
  "exchange": 0,
  "market_type": 1,
  "symbol": "TRXUSDT",
  "linking_type": 2
}

This assigns Binance Futures TRXUSDT to the Red link.

Response

Success:

{
  "status": "ok"
}

Error (invalid JSON):

{
  "status": "error",
  "error_code": 1000,
  "message": "Invalid JSON format."
}

Error (empty/malformed):

{
  "status": "error",
  "error_code": 1001,
  "message": "Empty or malformed request."
}

Error (missing method):

{
  "status": "error",
  "error_code": 1002,
  "message": "Missing 'method' field."
}

Error (unknown method):

{
  "status": "error",
  "error_code": 1004,
  "message": "Unknown or unsupported method '...'."
}

If the symbol is not found for the given exchange and market type, the server still returns success as above ("status":"ok"); the link is only updated when the currency pair exists.