Fair Market Value

WS
Business: wss://business.polygon.io/stocks

Stream real-time Fair Market Value (FMV) data for a specified stock ticker via WebSocket. This proprietary metric, available exclusively to Business plan users, provides an algorithmically derived, real-time estimate of a security’s fair market price. By delivering accurate, continuous valuation data, this feed supports informed trading decisions, enhanced analytics, and more effective risk management.

Use Cases: Pricing strategies, algorithmic modeling, risk assessment, investor decision-making.

Parameters
ticker
string
required
Specify a stock ticker or use * to subscribe to all stock tickers. You can also use a comma separated list to subscribe to multiple stock tickers. You can retrieve available stock tickers from our Stock Tickers API.
Response Attributes
ev
enum (FMV)
The event type.
fmv
number
Fair market value is only available on Business plans. It is our proprietary algorithm to generate a real-time, accurate, fair market value of a tradable security. For more information, contact us.
sym
string
The ticker symbol for the given security.
t
integer
The nanosecond timestamp.
Code Examples
Subscription Request
WS
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Response Object
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