API
Stagingv2

Market data

Market depth order book

Return the aggregated order book for a single security, with pending bids and asks collapsed into price levels within the day's price band.

GET/v2/vendor/market-depth/order-book
Requires scopemarket.depth.order.book
This endpoint does not use the standard envelopeFor efficiency the order book is returned as a top-level object with symbol, timestamp, status and order_book keys, not wrapped in { success, message, data }. Branch on the shape accordingly.

Query parameters

ParameterDescription
security
string
required		Security symbol to fetch the book for, for example SDNASDPLC.

Response fields

FieldDescription
symbol
string
The security requested.
timestamp
string
ISO 8601 time the book was computed.
status
string
Ok when the book was built successfully.
order_book.asks
array
Sell levels, ascending by price. Each has price, quantity and orders.
order_book.bids
array
Buy levels, descending by price. Each has price, quantity and orders.
Request
curl "https://stagingmobile.nasdng.com/v2/vendor/market-depth/order-book?security=SDNASDPLC" \
  -H "Authorization: Bearer sk_test_xxxxxxxxxxxxxxxxxxxxxxxx"
const params = new URLSearchParams({ security: "SDNASDPLC" });
const res = await fetch(
  `https://stagingmobile.nasdng.com/v2/vendor/market-depth/order-book?${params}`,
  { headers: { Authorization: "Bearer sk_test_xxxxxxxxxxxxxxxxxxxxxxxx" } }
);
const { data } = await res.json();
import requests

res = requests.get(
    "https://stagingmobile.nasdng.com/v2/vendor/market-depth/order-book",
    params={"security": "SDNASDPLC"},
    headers={"Authorization": "Bearer sk_test_xxxxxxxxxxxxxxxxxxxxxxxx"},
)
data = res.json()
Response 200 OK
{
  "symbol": "SDNASDPLC",
  "timestamp": "2026-07-06T13:20:11.482Z",
  "status": "Ok",
  "order_book": {
    "asks": [
      {
        "price": "40.20",
        "quantity": "1000",
        "orders": 3
      },
      {
        "price": "40.35",
        "quantity": "500",
        "orders": 1
      }
    ],
    "bids": [
      {
        "price": "40.10",
        "quantity": "1500",
        "orders": 4
      },
      {
        "price": "39.95",
        "quantity": "800",
        "orders": 2
      }
    ]
  }
}