Extended Trading Bot in Python

This guide shows how to build a Extended trading bot in Python with LumiBot, for both AI agent trading and algorithmic trading. LumiBot connects to Extended through CCXT, the open source library that talks to more than 100 crypto exchanges. You will create a Extended account and API wallet, connect it, and run two examples: a simple algorithmic trading bot and an agentic trading bot where an AI agent makes the calls.

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Extended at a glance

CCXT exchange id

extended

Markets

Perpetual swaps

Testnet (sandbox)

Yes

Credentials

API key, private key

Live data streams

order book, trades, candles, your orders, your balance, your positions

CCXT request spacing

about 600 ms between requests

Official site

https://app.extended.exchange

API docs

https://api.docs.extended.exchange

Fees

https://docs.extended.exchange/extended-resources/trading/trading-fees-and-rebates

What is Extended?

Extended is a decentralized exchange with leveraged perpetual markets on crypto and real-world assets. You sign in with your own crypto wallet. CCXT 4.5.91 exposes its perpetual markets; this guide uses that adapter capability.

Sign up for Extended

  1. Open Extended and connect a wallet. Extended works with EVM and Starknet wallets.

  2. Sign the account creation request, then sign the registration request. This creates your Extended trading account and turns on trading.

  3. For practice, also connect a wallet on the Extended testnet at https://starknet.sepolia.extended.exchange and claim free test USDC (up to $1,000 worth per wallet per day).

Open a Extended account

Set up a Extended API wallet

  1. Log in to Extended with your wallet.

  2. Pick the sub-account (trading account) you want the bot to use. You can make up to 10 per wallet from the Account section at the bottom right of the Trade screen.

  3. Open the API management page (https://app.extended.exchange/api-management).

  4. Create or copy the API key for that sub-account.

  5. Copy the Stark private key for the same sub-account. LumiBot sends it to CCXT as privateKey to sign orders. Never share it with anyone.

Which permissions to turn on: Extended has no permission checkboxes. The API key alone can only read data: Extended says it cannot create orders, transfer funds or withdraw. Orders need the API key plus a signature from the Stark private key, and so do withdrawals. Extended only sends withdrawals to wallets linked to your account, but treat the Stark private key like a password and keep only bot money in the bot’s sub-account.

Warning

A Extended private key is as powerful as the money it controls. Use a separate wallet or API wallet that holds only what you want the bot to trade, keep the key out of your code and out of Git, and move your funds if the key ever leaks.

Connect Extended to LumiBot

The simplest way: put these lines in a .env file next to your strategy. LumiBot loads the file, sees TRADING_BROKER=extended and connects to Extended for you, so your strategy needs no broker code.

TRADING_BROKER=extended
EXTENDED_API_KEY=your_apiKey
EXTENDED_PRIVATE_KEY=your_privateKey
EXTENDED_SANDBOX=true   # testnet; remove this line for your live account

LumiBot reads exactly the fields CCXT needs for Extended (apiKey, privateKey). If one is missing, LumiBot stops at start-up and names the variable you still need.

You can also build the broker in code. This is handy when one script talks to more than one exchange, or when you need extra CCXT options. The keys in the config are CCXT’s own credential names for Extended:

import os

EXTENDED_CONFIG = {
    "exchange_id": "extended",
    "apiKey": os.environ.get("EXTENDED_API_KEY"),
    "privateKey": os.environ.get("EXTENDED_PRIVATE_KEY"),
    "sandbox": True,  # testnet first; set False for your live account
}

from lumibot.brokers import Ccxt

broker = Ccxt(EXTENDED_CONFIG)
# then: MyStrategy(broker=broker, ...)

Either way, LumiBot turns on CCXT’s built-in rate limiting for you.

Practice on the Extended testnet

Extended runs a testnet at https://starknet.sepolia.extended.exchange with its own accounts and keys, and free test USDC from the Claim button in the Account section. Set EXTENDED_SANDBOX=true (or "sandbox": True in a code config) to use it.

CCXT sends sandbox requests to: https://api.starknet.sepolia.extended.exchange. Testnet and live accounts use different keys.

Algorithmic trading example: a simple Extended bot

CCXT lists no spot market for Extended, so this example trades a perpetual contract. It opens one small long BTC position worth about 50 USDC and then holds it. It is a starting point to check that your keys, balances and orders work. If the exchange’s minimum order is larger, raise the amount. If your account uses hedge mode, add position_side="long" to create_order. Extended accepts only limit orders through CCXT, so the example places a limit order just above the last price.

from lumibot.entities import Asset
from lumibot.strategies import Strategy


class ExtendedOpenOneLong(Strategy):
    """Open one small long BTC perpetual position, then hold it."""

    def initialize(self):
        self.sleeptime = "1H"
        self.set_market("24/7")  # crypto trades all day, every day

    def on_trading_iteration(self):
        # The full CCXT symbol keeps the settlement currency clear.
        contract = self.broker.get_asset("BTC/USDC:USDC")
        if self.get_position(contract) is not None:
            return  # already holding the position
        price = self.get_last_price(contract)
        if price:
            # Each contract covers contract.multiplier BTC; size the order to about 50 USDC.
            quantity = round(50 / (price * contract.multiplier), 6)
            # This exchange takes only limit orders through CCXT.
            order = self.create_order(contract, quantity, "buy", limit_price=price * 1.002)
            self.submit_order(order)


if __name__ == "__main__":
    # LumiBot reads TRADING_BROKER and the keys from your .env file.
    strategy = ExtendedOpenOneLong(quote_asset=Asset("USDC", asset_type=Asset.AssetType.CRYPTO))
    strategy.run_live()

Agentic trading example: an AI agent that trades on Extended

Agentic trading means an AI agent reads the market and decides what to do. In this example one LumiBot agent looks at prices and your Extended account, then places the orders itself. There is no Python logic in between: you set the rules in plain English in the prompt, such as what it may trade and how big each order can be. This follows the same pattern as LumiBot’s AI trading team examples.

from lumibot.entities import Asset
from lumibot.strategies import Strategy


class ExtendedAITrader(Strategy):
    """One AI agent researches the market and places the trades itself."""

    def initialize(self):
        self.sleeptime = "4H"
        self.set_market("24/7")
        self.agents.create(
            name="trader",
            model="openai/gpt-6-luna",
            reasoning_effort="high",
            allow_trading=True,
            system_prompt=(
                "You manage a small crypto account on Extended. "
                "You may trade the BTC/USDC:USDC perpetual contract (asset_type 'crypto_future'), long or short, or stay flat. "
                "Before every order, call account_portfolio, account_positions and "
                "market_last_price for that exact symbol in the same run. "
                "Keep each order under 10% of the account value. "
                "Explain each decision in one short paragraph."
            ),
        )

    def on_trading_iteration(self):
        self.agents["trader"].run(
            task_prompt="Review recent BTC/USDC:USDC prices and your current position, then decide whether to buy, sell or hold.",
            context={"exchange": "Extended", "quote": "USDC", "date": self.get_datetime().isoformat()},
        )


if __name__ == "__main__":
    # LumiBot reads TRADING_BROKER and the keys from your .env file.
    strategy = ExtendedAITrader(quote_asset=Asset("USDC", asset_type=Asset.AssetType.CRYPTO))
    strategy.run_live()

The agent needs a model key such as OPENAI_API_KEY in your environment. See the AI agents quickstart for models, tools and memory.

What you can trade on Extended

Market

Listed by CCXT

Spot

No

Margin

No

Perpetual swaps

Yes

Dated futures

No

Options

No

CCXT lists these order features for Extended: editing open orders, canceling orders.

For perpetual contracts, use the full CCXT symbol so the settlement currency is clear, for example BTC/USDC:USDC. See the CCXT guide for contract quantities, position modes and leverage.

Fees and partner IDs on Extended

You pay Extended’s normal trading fees. LumiBot may attach its own exchange partner ID. That costs you nothing extra. CCXT also adds its own extra builder fee on Extended, paid by you. LumiBot turns it off. LumiBot never adds a builder fee unless one is turned on in its settings, and it logs a warning when one is, because it costs you extra on every order.

Extended tips

  • Each Extended sub-account has its own API key and Stark key. Use a separate sub-account for each bot so its money and trades stay apart.

  • Perpetual symbols use the full CCXT form, for example BTC/USDC:USDC. CCXT 4.5.91 does not advertise spot trading for Extended.

  • Extended moved its settlement network from Starknet to Arc (a blockchain from Circle) starting 22 October 2026. Extended says you keep the same wallet and keys. If your bot cannot connect after the move, check that your CCXT version is current.

Frequently asked questions

Can I build a Extended trading bot in Python?

Yes. Install LumiBot (pip install lumibot), set your Extended keys and use the extended CCXT exchange id as shown above.

Does Extended have a testnet?

Yes. Set EXTENDED_SANDBOX=true and use keys from the Extended testnet.

Which keys does a Extended bot need?

Extended has no permission checkboxes. The API key alone can only read data: Extended says it cannot create orders, transfer funds or withdraw. Orders need the API key plus a signature from the Stark private key, and so do withdrawals. Extended only sends withdrawals to wallets linked to your account, but treat the Stark private key like a password and keep only bot money in the bot’s sub-account.

Can an AI agent trade on Extended by itself?

Yes. The agentic example above gives one agent permission to trade. You control what it may trade and how much through its prompt.

Can I trade Extended perpetual futures with LumiBot?

CCXT lists perpetual swaps for this exchange. Use the full contract symbol, such as BTC/USDC:USDC.

Is LumiBot free?

Yes. LumiBot is open source on GitHub at https://github.com/Lumiwealth/lumibot. You pay only your exchange’s trading fees and, for AI agents, your model provider.

Run it in the cloud with BotSpot

Do not want to keep a computer running for your Extended bot? BotSpot is the hosted home for LumiBot strategies and AI trading agents: build with AI, backtest, connect a broker, and watch every trade with logs and alerts.

Try BotSpot

Sources