Interactive Brokers.

The honest pitch.

Interactive Brokers is what professional retail traders end up at: the lowest commissions, the most products, and the deepest international coverage. The price is the API. The official TWS API is famously verbose — request IDs, contract specifications, market-data-type modes, and decades-old quirks. Most Python automators use 'ib_insync', a small wrapper that turns TWS's callbacks into awaitable coroutines and DataFrames. The IBKR Web API (REST + WebSocket) is newer and cleaner, but still requires a Client Portal Gateway running locally with a daily login.

Auth, orders, limits.

Hello-world, but real.

ib_insync wraps TWS callbacks in asyncio. This script connects to a running TWS/Gateway, defines a Stock contract, places a bracketed market buy (parent + stop + take-profit), and waits for the fill event. You need TWS or IB Gateway running before this works.

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# pip install ib_insync
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from ib_insync import IB, Stock, MarketOrder, StopOrder, LimitOrder
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ib = IB()
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ib.connect("127.0.0.1", 7497, clientId=42)   # 7497 = paper, 7496 = live
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contract = Stock("SPY", "SMART", "USD")
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ib.qualifyContracts(contract)
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# Bracket: parent market BUY + child stop SELL + child take-profit SELL
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parent     = MarketOrder("BUY",  1, transmit=False, orderId=ib.client.getReqId())
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take_profit = LimitOrder("SELL", 1, 0.0, parentId=parent.orderId, transmit=False,
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                          orderId=ib.client.getReqId())
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stop_loss   = StopOrder("SELL",  1, 0.0, parentId=parent.orderId, transmit=True,
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                          orderId=ib.client.getReqId())
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# Set bracket prices using last trade
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ticker = ib.reqMktData(contract)
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ib.sleep(2)
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px = ticker.marketPrice() or ticker.close
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take_profit.lmtPrice = round(px * 1.01, 2)   # +1%
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stop_loss.auxPrice   = round(px * 0.995, 2)  # -0.5%
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for o in (parent, take_profit, stop_loss):
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    ib.placeOrder(contract, o)
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# Wait up to 10s for the parent to fill
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ib.sleep(10)
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print("parent status:", ib.trades()[0].orderStatus.status)
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ib.disconnect()

The traps everyone hits.

Real production failure modes. Sev1 = capital loss risk. Sev2 = data integrity / silent wrongness. Sev3 = developer ergonomics that bite later.

What to pair it with.

No platform stands alone. These are the layers that — paired with Interactive Brokers — produce production-grade automation.

Where to read next.

• docsTWS API documentation↗
• sdkib_insync (Python wrapper)↗
• refIBKR Web API (REST/WS)↗
• sdkibc — IB Gateway automation↗