US Stock Market Data API

Covering NYSE, NASDAQ & AMEX with 12,000+ symbols. WebSocket millisecond-level streaming for quant trading and market terminals.

Market Coverage

Exchange / Category Symbols Data Types Frequency
NYSE (New York Stock Exchange) ~4,200+ Tick / Trade / Depth Real-time
NASDAQ ~5,500+ Tick / Trade / Depth Real-time
AMEX ~2,700+ Tick / Trade Real-time

Technical Specs

Avg Latency
< 80ms
Protocol
WebSocket / REST
Data Types
Tick, Trade, Depth (L2)
Historical
Up to 10Y K-line
Push Freq
Tick-by-tick / 500ms
Uptime
99.9% SLA

Code Examples

Quick Start

# pip install websocket-client
import websocket
import json

api_key = 'your_api_key_here'
ws_url = f'wss://api.tickdb.ai/v1/realtime?api_key={api_key}'

def on_open(ws):
    ws.send(json.dumps({
        'cmd': 'subscribe',
        'data': {
            'channel': 'ticker',
            'symbols': ['AAPL.US', 'TSLA.US', 'MSFT.US']
        }
    }))

def on_message(ws, message):
    data = json.loads(message)
    print('Received:', data)

ws = websocket.WebSocketApp(ws_url, on_open=on_open, on_message=on_message)
ws.run_forever()

Full documentation available at API Documentation

Comparison

Comparison based on publicly available documentation as of April 2026. Please refer to each provider for the latest information.

Provider Real-timeWebSocketDepthCoverageChinese DocsPrice
Polygon.io Leading US stock data provider โœ… Real-timeโœ… Robustโœ… Crypto L2US stocks/options/forex/cryptoโŒ English onlyFree limited; from $29/mo
Alpha Vantage Legacy financial data API โš ๏ธ Real-time from $99/mo; free 15min delayโŒ REST onlyโŒUS stocks/forex/crypto/indicatorsโŒ English onlyFree 25/day; from $49.99/mo
TickDB Unified multi-market API โœ… Sub-100msโœ…โœ… L2 (paid)US/HK/CN/Forex/Cryptoโœ… Chinese-firstFree tier; paid unlocks all

Use Cases

Quant Backtesting

High-precision historical tick data replay for strategy validation and parameter optimization.

Trading Terminal

Real-time streaming to power custom trading UIs with millisecond price updates.

Cross-market Monitoring

Subscribe to US-listed Chinese ADRs and HK stocks simultaneously to monitor price spreads.

Choose Your Plan

All paid plans support monthly / quarterly / semi-annual / annual billing. Prices below are annual (20% off)

๐Ÿ”ฅ Save 20% Annually

Free

Free 7-Day Trial

 

  • Selected symbols*
  • 5 concurrent subscriptions
  • Real-time quotes
  • Real-time K-line
  • 1 WebSocket connection
  • 30 req/min API calls
  • Email support
Start Free
-20%

Starter

$99/mo
$79 /mo

Billed annually $948

  • All symbols
  • 50 concurrent subscriptions
  • Real-time quotes
  • Real-time K-line
  • Real-time order book
  • Real-time trades
  • Night session data
  • 1 year historical data
  • 1 WebSocket connection
  • 60 req/min API calls
  • Email support
Subscribe Now
-20%
Most Popular

Professional

$299/mo
$239 /mo

Billed annually $2868

  • All symbols
  • 300 concurrent subscriptions
  • Real-time quotes
  • Real-time K-line
  • Real-time order book
  • Real-time trades
  • Night session data
  • 3 years historical data
  • 3 WebSocket connections
  • 600 req/min API calls
  • Telegram support
Subscribe Now
-20%

Enterprise

$899/mo
$719 /mo

Billed annually $8628

  • All symbols
  • 5000+ concurrent subscriptions
  • Real-time quotes
  • Real-time K-line
  • Real-time order book
  • Real-time trades
  • Night session data
  • 10 years historical data
  • 10 WebSocket connections
  • 1800+ req/min API calls
  • Telegram support
Subscribe Now

FAQ

What is the latency for TickDB US stock data?
Via WebSocket, end-to-end latency is typically 50-80ms depending on your network and server location.
Which US exchanges are covered?
NYSE, NASDAQ, and AMEX โ€” over 12,000 symbols in total.
Can I get US stock data on the free plan?
Yes. The free plan includes a limited set of US stock symbols for development and testing. Upgrade to unlock all symbols.
How does TickDB compare to Polygon.io?
Polygon.io is a mature US stock data provider with excellent WebSocket infrastructure and broad US coverage. TickDB differentiates by covering US, HK, China A-shares, forex, and crypto in a single API, with Chinese-first documentation โ€” ideal for developers needing multi-market access.
How do I get started?
Sign up for a free API Key, then connect via WebSocket at wss://api.tickdb.ai/v1/realtime to subscribe to real-time US stock data.

Start Streaming Real-time Market Data

Sign up for a free API Key. WebSocket real-time streaming. Get started in minutes.