Twelve Data WebSocket Alternative for Multi-Asset Bots

Building a bot that balances a crypto position against currency or gold exposure usually breaks when you inspect the pricing page for streaming data. If you need a Twelve Data WebSocket alternative because your monthly bill jumps every time you track another market, you can run multi-asset streams over a single connection without siloed charges.

TL;DR: Most streaming market data providers bill separately for crypto, forex, and equities. RealMarketAPI WebSocket streaming packages forex, crypto, gold, and indices into shared tiers starting at $14.99 per month for 10 concurrent WebSocket connections.

The Multi-Asset Cost Trap in Streaming Data

Most providers treat every asset class as an independent catalog. If you write an automated risk management script that streams spot Bitcoin alongside currency pairs like EURUSD and precious metals like XAUUSD, legacy providers make you subscribe to three distinct plans.

Twelve Data and Polygon.io separate their streaming tiers into discrete packages. On Polygon.io, adding real-time currency feeds to existing crypto feeds means buying separate plans. On Twelve Data, WebSockets require higher-tier plans, and coverage across multiple asset categories increases baseline costs quickly.

For an independent developer or small team running an execution bot, paying over a hundred dollars a month just to ingest quotes before testing a strategy is inefficient. You end up maintaining separate socket client implementations, distinct authentication protocols, and disparate JSON schemas across vendors.

Twelve Data WebSocket Alternative: Connection Limits and Pricing

When evaluating a Twelve Data WebSocket alternative, look at connection concurrency, supported tickers, and asset class barriers.

Feature / Plan	Twelve Data	Polygon.io	RealMarketAPI Plus	RealMarketAPI Pro
Monthly Base Cost	Tier-based add-ons	Separate asset plans	$14.99 / mo	$34.99 / mo
Asset Classes Included	Billed per market type	Crypto and Currencies separate	Crypto, Forex, Gold, Indices	Crypto, Forex, Gold, Indices
WebSocket Concurrency	Varies by tier	1 connection per plan	10 connections	100 connections
Multi-Asset Single Socket	No	No	Yes	Yes
Historical Data Access	Depends on plan	Depends on plan	3 months history	1 year history
MCP Server Access	Not included	Not included	No	Included (33 tools)

RealMarketAPI aggregates tick feeds from multiple upstream liquidity venues and exchanges, including Binance, OKX, Coinbase, Exness, IG Group, OANDA, and Vantage. Instead of managing seven exchange connections yourself, the service normalizes the stream into one uniform socket pipe.

Read the implementation breakdown in cheap websocket market data for details on handling socket frame reconnects.

Multi-Asset Payloads: Streaming BTCUSD and EURUSD in One Pipe

Instead of opening one connection for crypto and another for forex, you connect directly to wss://api.realmarketapi.com with your API key. Once connected, subscribe to your target symbols across any supported asset class.

Here is a complete Python client using the websockets library that connects, subscribes to BTCUSD, EURUSD, and XAUUSD simultaneously, and parses the normalized feed:

import asyncio
import json
import websockets

API_KEY = "YOUR_API_KEY"
WS_URL = f"wss://api.realmarketapi.com?apiKey={API_KEY}"

async def stream_market_data():
    async with websockets.connect(WS_URL) as ws:
        # Subscribe to crypto, forex, and metals on a single connection
        subscribe_msg = {
            "action": "subscribe",
            "symbols": ["BTCUSD", "EURUSD", "XAUUSD"],
            "timeFrame": "M1"
        }
        await ws.send(json.dumps(subscribe_msg))
        print("Subscribed to BTCUSD, EURUSD, and XAUUSD")

        while True:
            response = await ws.recv()
            data = json.loads(response)

            symbol = data.get("SymbolCode")
            bid = data.get("Bid")
            ask = data.get("Ask")
            close_price = data.get("ClosePrice")
            open_time = data.get("OpenTime")

            print(f"[{open_time}] {symbol} - Close: {close_price} | Bid: {bid} | Ask: {ask}")

if __name__ == "__main__":
    asyncio.run(stream_market_data())

The returned fields match the schema used in the REST price endpoint, returning SymbolCode, OpenPrice, ClosePrice, HighPrice, LowPrice, Bid, Ask, Volume, and OpenTime (values illustrative):

{
  "SymbolCode": "BTCUSD",
  "OpenPrice": 64230.50,
  "ClosePrice": 64245.10,
  "HighPrice": 64260.00,
  "LowPrice": 64220.00,
  "Bid": 64244.80,
  "Ask": 64245.40,
  "Volume": 14.82,
  "OpenTime": "2025-05-10T14:30:00Z"
}

If you prefer testing endpoints synchronously via HTTP before spinning up event loops, query the latest candle using cURL:

curl "https://api.realmarketapi.com/api/v1/price?apiKey=YOUR_API_KEY&symbolCode=XAUUSD&timeFrame=M1"

Connection Scaling from Plus to Pro Tiers

Different bot architectures require different connection allowances. The Plus plan ($14.99 per month) provides 10 concurrent WebSocket connections and 75,000 REST requests per month. This works well if you deploy a single trading instance with separate worker processes for execution, order book monitoring, and telemetry.

When scaling to a fleet of microservices or containerized instances running distinct trading algorithms, the Pro plan ($34.99 per month) grants 100 concurrent WebSocket connections and 200,000 REST requests. The Pro plan also includes the MCP server integration containing 33 tools and the Intelligence API (covering next-candle bias, trend setups, and liquidity zones).

If your setup incorporates language models or autonomous tools, you can route market signals into an agent loop using this guide on setting up a trading bot mcp server.

Selecting the Right WebSocket Plan for Your Stack

Consider the operational tradeoffs when selecting your data pipeline:

1. Free Tier ($0/mo): Includes 5,000 REST requests per month covering symbols like gold, silver, BTC, ETH, EURUSD, and Google on M1, M5, and H1 timeframes. This tier does not include WebSocket access. Use it to build and test your strategy logic over REST.
2. Starter ($4.99/mo): Grants 20,000 REST requests across 60+ symbols and all timeframes with 30 days of history, but remains REST-only.
3. Plus ($14.99/mo): The entry point for streaming. Gives you 10 WebSocket connections and 3 months of historical data. Ideal for standard execution bots monitoring multiple symbols.
4. Pro ($34.99/mo): Provides 100 WebSocket connections, 1 year of history, and full MCP access. Ideal for distributed execution nodes.

If your architecture requires order book execution on illiquid regional stock exchanges or thousands of equity options tickers, traditional institutional vendors are a better fit. But if your strategy centers on liquid FX pairs, major crypto pairs, gold, and key equity indices, bundling those feeds into one WebSocket cuts out unnecessary infrastructure overhead.

Get an API key on RealMarketAPI and run the Python script above against wss://api.realmarketapi.com with EURUSD or BTCUSD to inspect the raw stream.