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WebSocket Subscription Tiers & Weights

Nubra WebSocket streams use a weight-based subscription system to ensure fair usage and stable performance across all clients.

Each active WebSocket subscription consumes a fixed number of weight points.
Your account has a maximum weight capacity, and the sum of all active subscriptions must remain within this limit.

Subscription Weights by Stream

WebSocket Stream Weight per Subscription
Option Chain 20
Order Book 5
OHLC 2
Index 1
Greeks 1

Each individual subscription to a stream consumes the corresponding number of weight points.

Free Tier Limits

Limit Type Value
Total WebSocket Weight (Session Limit) 50,000 points
  • The 50,000-point limit applies to the combined weight of all active WebSocket subscriptions.

Example Scenarios

Example 1: Mixed Subscriptions

300 Option Chain subscriptions → 300 × 20  = 6,000 points
400 Order Book subscriptions   → 3,000 × 5   = 15,000 points
1,000 Index subscriptions      → 1,000 × 1 = 1,000 points
----------------------------------------------
Total Weight Used              → 22,000 / 50,000

Example 2: Option Chain Heavy Usage

1,000 Option Chain subscriptions → 1,000 × 20 = 20,000 points

Within the allowed session weight limit.

Example 3: Exceeding Limits

1,100 Option Chain subscriptions → 2,600 × 20 = 52,000 points

Not allowed — exceeds the 50,000-point session limit.

Session Enforcement

  • Weight limits are enforced per WebSocket session.
  • Each session supports subscriptions up to a total of 50,000 weight points.
  • If a client attempts to subscribe beyond this limit, the request is rejected with an error.

Need Higher Limits?

If your use case requires:

  • Higher WebSocket weight capacity
  • More Option Chain subscriptions
  • Institutional or high-frequency access

Please reach out to: support@nubra.io

Our team can help provision higher limits based on your requirements.

NEO Assistant