What is the maximum number of symbols I can subscribe to in the Data Websocket?
To maintain system efficiency and ensure reliable performance for all users, FYERS imposes a subscription cap on its Market Data WebSocket service. This limit defines how many instruments you can track live at once.
Symbol subscription limit
You can subscribe to a maximum of 200 symbols at any given time using the FYERS Data WebSocket. This includes all instruments across equities, indices, and derivatives, and applies to both lite and symbolUpdate modes.
Why this limit matters
- Stability: Prevents overload on the client and server
- Performance: Ensures low-latency, uninterrupted tick delivery
- Compliance: Adheres to fair usage practices
What if...
| Scenario | Outcome |
|---|
| You try to subscribe to more than 200 symbols | FYERS will ignore or reject symbols beyond the limit |
| You rotate symbols dynamically | Unsubscribe before adding new ones to stay within the cap |
| You want to track more than 200 | Consider logic-based switching based on active user focus or demand |
Maintain an internal list of subscribed symbols to track usage and dynamically manage your pool without hitting the cap.
Last updated: 30 Jun 2025
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