FMP
Real-Time WebSocket Streaming APIs
Stream live financial data with speed and precision using FMP's WebSocket APIs. Deliver real-time quotes for stocks, crypto, and forex with low-latency connections built for trading platforms, dashboards, and high-performance apps.
Explore NowFMP is trusted by leading financial organizations
About FMP WebSocket APIs
FMP's WebSocket APIs provide persistent, event-driven connections that deliver financial data as it happens. Unlike REST APIs that require polling, WebSockets offer a constant feed of real-time updates, ideal for high-frequency platforms or responsive user interfaces.
Low-latency quote streams for U.S. equities, crypto, and forex
Subscribe to individual or multiple symbols
Bi-directional WebSocket connections for efficient delivery
Scalable infrastructure for high-volume throughput
Lightweight JSON payloads for easy parsing
Use Cases
1
Brokerage & Trading Platforms
Display ultra-fast price updates with minimal delay.
2
Quantitative & Algorithmic Trading
Trigger trades or strategies based on real-time ticks.
3
Portfolio & Watchlist Dashboards
Keep users continuously updated with no refresh required.
4
Market Visualization & News Apps
Power heatmaps, charts, and data widgets in real time.
Available Endpoints
U.S. Stocks WebSocket API
Forex WebSocket API
Crypto WebSocket API
Get Access Now
Get access to financial data that can be used for commercial purposes. Individual plans can be accessed here
Up To 34% Discount
Basic
Ideal for testing our endpoints and exploring our data.
250 Calls / Day
End of Day Historical Data
Profile and Reference Data
Experience over 150+ Endpoints
Starter
A great entry point for accessing fundamental financial market data.
...everything in Basic plus
300 API Calls / Minute
Up to 5 Years of Historical Data
US Coverage
Annual Fundamentals and Ratios
Historical Stock Price Data
Profile and Reference Data
Financial Market News
Crypto and Forex
billed annuallyPremium
Comprehensive fundamental and advanced financial market data to meet your needs.
...everything in Starter plus
750 API Calls / Minute
Up to 30 Years of Historical Data
UK and Canada Coverage
Full Fundamentals and Ratios
Intraday Charts
Technical Indicators
Corporate Calendars
Custom DCF Calculator
billed annuallyUltimate
Complete access to financial market data for tracking all aspects of the market.
...everything in Premium plus
3,000 API Calls / Min
Global Coverage
Earnings Call Transcripts
ETF & Mutual Fund Holdings
13F Institutional Holdings
1 Minute Intraday Charting
Full Historical Access
Bulk and Batch Delivery
billed annuallyFAQs
What markets are supported through FMP WebSocket APIs?
FMP's WebSocket infrastructure supports U.S. equities, global forex currency pairs, and major cryptocurrencies. Each market has a dedicated channel, and you can subscribe to one or more based on your needs.
What are the advantages of using WebSockets vs REST APIs?
WebSocket APIs provide real-time, push-based data delivery, which eliminates the need for constant polling. This reduces latency, saves bandwidth, and ensures a smoother, more responsive experience for trading and visualization platforms.
How many symbols can I subscribe to at once?
The number of simultaneous subscriptions depends on your plan tier, but enterprise plans allow hundreds or thousands of concurrent symbol streams. This makes the WebSocket APIs scalable for institutional platforms or large dashboards.
Is the data delivered in real time with minimal delay?
Yes. WebSocket streams are optimized for minimal latency and are delivered in near real time. They're suitable for use cases where every tick matters—like algorithmic trading, signal alerts, and responsive UI updates.
Do I need a separate key to access WebSocket APIs?
Yes. WebSocket streams require a dedicated API key, which you can obtain after signing up for a plan. Once authenticated, you'll have access to the supported channels and symbol-level subscriptions.
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