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A Thetadata Options Standard Subscription is required to use this endpoint.

Quote Stream ​

Behavior ​

This stream returns every BBO quote reported on the Nasdaq Basic feed for the specified symbol. The Theta Terminal will continue to receive these messages unless it is terminated or you unsubscribe from the full trade stream.

Subscribe to Trade Stream ​

The id field should be increased for each new stream request made. This ID is returned in a later message to verify that the request to stream trades was successful. This ID does not have any representation of contracts or unqiue streams. It only represents a way of tracking streaming requests made. Failure to increment the ID for each request will prevent the terminal from automatically resubscribing to streams you previously requested.

Contract Parameter ​

The contract in the payload example below is subscribing to all quotes for AAPL stock.

Payload ​

json
{
    "msg_type": "STREAM",
    "sec_type": "STOCK",
    "req_type": "QUOTE",
    "add": true,
    "id": 0,
    "contract": {
        "root": "AAPL"
    }
}

Sample Code ​

The Theta Terminal must be running for this code to work.

Python
import asyncio
import websockets

# This code has only been tested on Python 3.11. Other versions might require adjustments.
async def stream_trades():
    async with websockets.connect('ws://127.0.0.1:25520/v1/events') as websocket:
        req = {}
        req['msg_type'] = 'STREAM'
        req['sec_type'] = 'STOCK'
        req['req_type'] = 'QUOTE'
        req['add'] = True
        req['id'] = 0
        req['contract'] = {}
        req['contract']['root'] = "AAPL"
        await websocket.send(req.__str__())
        while True:
            response = await websocket.recv()
            print(response)


asyncio.get_event_loop().run_until_complete(stream_trades())
Java
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JavaScript
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Go
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Unsubscribe from the Quote Stream ​

Changing the add field in the payload from true to false will end the stream subscription.

json
{
    "msg_type": "STREAM",
    "sec_type": "STOCK",
    "req_type": "QUOTE",
    "add": false,
    "id": 1,
    "contract": {
        "root": "AAPL"
    }
}

Sample output ​

  • The condition and exchange values correspond to their respective Enums.

  • The strike price is in 1/10ths of a cent. This means that a $140 strike price is represented as 140000.

json
{
    "header": {
        "type": "QUOTE",
        "status": "CONNECTED"
    },
    "contract": {
        "security_type": "STOCK",
        "root": "AAPL"
    },
    "quote": {
        "ms_of_day": 38437457,
        "bid_size": 235,
        "bid_exchange": 29,
        "bid": 184.49,
        "bid_condition": 0,
        "ask_size": 100,
        "ask_exchange": 29,
        "ask": 184.5,
        "ask_condition": 0,
        "date": 20240503
    }
}