Twelve Data Cryptocurrency APIs (Real Time & Historical)

Twelve Data provides robust cryptocurrency APIs for accessing real-time and historical market data. This guide demonstrates how to integrate their APIs across multiple programming languages, enabling developers to fetch time-series data, stream live prices, and build financial applications.

Core Features of Twelve Data APIs

Real-time market data: Get live cryptocurrency prices with low latency.
Historical data: Access OHLCV (Open, High, Low, Close, Volume) data for backtesting.
WebSocket support: Stream live price updates for instant alerts.
Multi-language SDKs: Native support for Python, Java, C++, C#, R, and more.

👉 Explore Twelve Data API documentation

How to Fetch Time-Series Data

Python Example

from twelvedata import TDClient

td = TDClient(apikey="YOUR_API_KEY_HERE")
ts = td.time_series(
    symbol="BTC/USD",  # Cryptocurrency pair
    interval="1min",
    outputsize=12,
)
print(ts.as_json())

Key Parameters

Parameter	Description	Example Value
`symbol`	Cryptocurrency pair	`BTC/USD`
`interval`	Data granularity	`1min`, `1h`
`outputsize`	Number of data points returned	`12`, `1000`

WebSocket Streaming for Real-Time Prices

Python WebSocket Implementation

from twelvedata import TDClient

def on_event(e):
    print("Live price update:", e)

td = TDClient(apikey="YOUR_API_KEY_HERE")
ws = td.websocket(symbols="BTC/USD", on_event=on_event)
ws.connect()

Supported Events

subscribe-status: Confirms successful subscription.
price: Live price updates with timestamp and currency.
error: Handles connection issues.

FAQ Section

Q1: How do I get started with Twelve Data APIs?

A1: Register for an API key on their developer portal, then install the language-specific SDK.

Q2: What’s the rate limit for free tier?

A2: Free tier allows 8 requests/minute and 800/day. Pro tiers offer higher limits.

Q3: Can I get historical Bitcoin data?

A3: Yes! Use the time_series endpoint with parameters like symbol=BTC/USD&interval=1day&outputsize=365.

Q4: How reliable is WebSocket streaming?

A4: Twelve Data’s WebSocket maintains >99.9% uptime with automatic reconnection.

👉 Start building with Twelve Data APIs today

Best Practices for API Usage

Cache historical data to minimize API calls.
Use WebSockets for real-time apps instead of polling.
Handle errors gracefully with retry logic for rate limits.
Monitor usage to stay within tier limits.

Advanced Use Cases

Algorithmic trading: Combine real-time streams with trading logic.
Portfolio trackers: Sync live prices across multiple coins.
Tax reporting: Export historical transactions for accounting.

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Note: Replace YOUR_API_KEY_HERE with your actual Twelve Data API key. All examples use BTC/USD for illustration—adapt symbols as needed.