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<li class="toctree-l1 current"><a class="current reference internal" href="#">Live Trading</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#supported-exchanges">Supported Exchanges</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#paper-trading-vs-live-trading-modes">Paper Trading vs Live Trading modes</a></li>
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<div class="section" id="live-trading">
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<h1>Live Trading<a class="headerlink" href="#live-trading" title="Permalink to this headline">¶</a></h1>
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<p>This document explains how to get started with live trading.</p>
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<div class="section" id="supported-exchanges">
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<h2>Supported Exchanges<a class="headerlink" href="#supported-exchanges" title="Permalink to this headline">¶</a></h2>
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<p>Since version 0.4, Catalyst integrated with <a class="reference external" href="https://github.com/ccxt/ccxt">CCXT</a>,
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a cryptocurrency trading library with support for more than 90 exchanges. The
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range of CCXT and Catalyst support for each of those exchanges varies greatly.
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The most supported exchanges are as follows:</p>
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<p>The exchanges available for backtesting are fully supported in live mode:</p>
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<ul class="simple">
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<li>Bitfinex, id = <code class="docutils literal"><span class="pre">bitfinex</span></code></li>
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<li>Bittrex, id = <code class="docutils literal"><span class="pre">bittrex</span></code></li>
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<li>Poloniex, id = <code class="docutils literal"><span class="pre">poloniex</span></code></li>
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</ul>
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<p>Additionally, we have successfully tested the following exchanges:</p>
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<ul class="simple">
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<li>Binance, id = <code class="docutils literal"><span class="pre">binance</span></code></li>
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<li>Bitmex, id = <code class="docutils literal"><span class="pre">bitmex</span></code></li>
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<li>GDAX, id = <code class="docutils literal"><span class="pre">gdax</span></code></li>
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</ul>
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<p>As Catalyst is currently in Alpha and in under active development, you are
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encouraged to throughly test any exchange in <em>paper trading</em> mode before trading
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<em>live</em> with it.</p>
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</div>
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<div class="section" id="paper-trading-vs-live-trading-modes">
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<h2>Paper Trading vs Live Trading modes<a class="headerlink" href="#paper-trading-vs-live-trading-modes" title="Permalink to this headline">¶</a></h2>
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<p>Catalyst currently supports three different modes in which you can execute your
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trading algorithm. The first is <strong>backtesting</strong>, which is covered extensively in
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the tutorial, and uses historical data to run your algorithm. There is no
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interaction with the exchange in backtesting mode, and this is the first mode
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that you should test any new algorithm.</p>
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<p>Once you are confident with the simulations that you have obtained with your
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algorithm in backtesting, you may switch to live trading, where you have two
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different modes:</p>
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<ul class="simple">
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<li><strong>Paper Trading</strong>: The simulated algorithm runs in real time, and fetches
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pricing data in real time from the exchange, but the orders never reach the
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exchange, and are instead kept within Catalyst and simulated. No real currency
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is bought or sold. Think of it as a <cite>backtesting happening in real time</cite>.</li>
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<li><strong>Live Trading</strong>: This is the proper live trading mode in which an algorithm
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runs in real time, fetching pricing data from live exchanges and placing
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orders against the exchange. Real currency is transacted on the exchange
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driven by the algorithm.</li>
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</ul>
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<p>These three modes are controlled by the following variables:</p>
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<table border="1" class="docutils">
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<colgroup>
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<col width="38%" />
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<col width="18%" />
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<col width="44%" />
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</colgroup>
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<tbody valign="top">
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<tr class="row-odd"><td rowspan="2">Mode</td>
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<td colspan="2">Parameters</td>
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</tr>
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<tr class="row-even"><td>live</td>
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<td>simulate_orders</td>
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</tr>
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<tr class="row-odd"><td>backtesting</td>
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<td>False</td>
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<td>True (default)</td>
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</tr>
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<tr class="row-even"><td>paper trading</td>
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<td>True</td>
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<td>True</td>
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</tr>
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<tr class="row-odd"><td>live trading</td>
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<td>True</td>
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<td>False</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="section" id="authentication">
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<h2>Authentication<a class="headerlink" href="#authentication" title="Permalink to this headline">¶</a></h2>
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<p>Most exchanges require token key/secret combination for authentication. By
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convention, Catalyst uses an <code class="docutils literal"><span class="pre">auth.json</span></code> file to hold this data.</p>
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<p>This example illustrates the convention using the <em>Bitfinex</em> exchange.
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Here is how to generate key and secret values for the Bitfinex exchange:
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<a class="reference external" href="https://docs.bitfinex.com/v1/docs/api-access">https://docs.bitfinex.com/v1/docs/api-access</a>. Most exchanges follow
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a similar process.</p>
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<p>The auth.json file:</p>
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<div class="highlight-json"><div class="highlight"><pre><span></span><span class="p">{</span>
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<span class="nt">"name"</span><span class="p">:</span> <span class="s2">"bitfinex"</span><span class="p">,</span>
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<span class="nt">"key"</span><span class="p">:</span> <span class="s2">"my-key"</span><span class="p">,</span>
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<span class="nt">"secret"</span><span class="p">:</span> <span class="s2">"my-secret"</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p>The file goes here: <code class="docutils literal"><span class="pre">~/.catalyst/data/exchanges/bitfinex/auth.json</span></code></p>
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<p>Note that the <cite>bitfinex</cite> part in the directory above corresponds to the id of the Bitfinex
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exchange as defined in the “Supported Exchanges” section above.
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Attempting to run an algorithm where the targeted exchange is missing
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its <code class="docutils literal"><span class="pre">auth.json</span></code> file will create the directory structure and create an empty
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auth.json file, but will result in an error.</p>
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</div>
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<div class="section" id="currency-symbols">
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<h2>Currency Symbols<a class="headerlink" href="#currency-symbols" title="Permalink to this headline">¶</a></h2>
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<p>Catalyst introduces a universal convention to reference
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trading pairs and individual currencies. This
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is required to ensure that the <code class="docutils literal"><span class="pre">symbol()</span></code> api predictably
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returns the correct asset regardless of the targeted exchange.</p>
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<p>Exchanges tend to use their own convention to represent currencies
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(e.g. XBT and BTC both represent Bitcoin on different exchanges).
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Trading pairs are also inconsistent. For example, Bitfinex
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puts the market currency before the base currency without a
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separator, Bittrex puts the base currency first and uses a dash
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seperator.</p>
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<p>Here is the Catalyst convention:</p>
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<p><em>[Market Currency]_[Base Currency]</em> all lowercase.</p>
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<p>Currency symbols (e.g. btc, eth, ltc) follow the Bittrex convention.</p>
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<p>Here are some examples:</p>
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<div class="code python highlight-python"><div class="highlight"><pre><span></span><span class="c1"># With Bitfinex</span>
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<span class="n">bitcoin_usd_asset</span> <span class="o">=</span> <span class="n">symbol</span><span class="p">(</span><span class="s1">'btc_usd'</span><span class="p">)</span>
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<span class="n">ethereum_bitcoin_asset</span> <span class="o">=</span> <span class="n">symbol</span><span class="p">(</span><span class="s1">'eth_btc'</span><span class="p">)</span>
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<span class="c1"># With Bittrex</span>
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<span class="n">ethereum_bitcoin_asset</span> <span class="o">=</span> <span class="n">symbol</span><span class="p">(</span><span class="s1">'eth_btc'</span><span class="p">)</span>
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<span class="n">neo_ethereum_asset</span> <span class="o">=</span> <span class="n">symbol</span><span class="p">(</span><span class="s1">'neo_eth)</span>
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</pre></div>
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</div>
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<p>Note that the trading pairs are always referenced in the same manner.
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However, not all trading pairs are available on all exchanges. An
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error will occur if the specified trading pair is not trading
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on the exchange. To check which currency pairs are available on each
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of the supported exchanges, see
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<a class="reference external" href="https://www.enigma.co/catalyst/status">Catalyst Market Coverage</a>.</p>
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</div>
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<div class="section" id="trading-an-algorithm">
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<h2>Trading an Algorithm<a class="headerlink" href="#trading-an-algorithm" title="Permalink to this headline">¶</a></h2>
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<p>There is no special convention to follow when writing an
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algorithm for live trading. The same algorithm should work in
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backtest and live execution mode without modification.</p>
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<p>What differs are the arguments provided to the catalyst client or
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<cite>run_algorithm()</cite> interface. Here is the same example in both interfaces:</p>
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<div class="highlight-bash"><div class="highlight"><pre><span></span>catalyst live -f my_algo_code -x bitfinex -c btc -n my_algo_name
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</pre></div>
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</div>
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<div class="highlight-python"><div class="highlight"><pre><span></span><span class="n">run_algorithm</span><span class="p">(</span>
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<span class="n">initialize</span><span class="o">=</span><span class="n">initialize</span><span class="p">,</span>
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<span class="n">handle_data</span><span class="o">=</span><span class="n">handle_data</span><span class="p">,</span>
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<span class="n">analyze</span><span class="o">=</span><span class="n">analyze</span><span class="p">,</span>
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<span class="n">exchange_name</span><span class="o">=</span><span class="s1">'bitfinex'</span><span class="p">,</span>
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<span class="n">live</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span>
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<span class="n">algo_namespace</span><span class="o">=</span><span class="s1">'my_algo_name'</span><span class="p">,</span>
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<span class="n">base_currency</span><span class="o">=</span><span class="s1">'btc'</span>
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<span class="p">)</span>
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</pre></div>
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</div>
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<p>Here is the breakdown of the new arguments:</p>
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<ul class="simple">
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<li><code class="docutils literal"><span class="pre">live</span></code>: Boolean flag which enables live trading. It defaults to <code class="docutils literal"><span class="pre">False</span></code>.</li>
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<li><code class="docutils literal"><span class="pre">capital_base</span></code>: The amount of base_currency assigned to the strategy.
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It has to be lower or equal to the amount of base currency available for
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trading on the exchange. For illustration, order_target_percent(asset, 1)
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will order the capital_base amount specified here of the specified asset.</li>
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<li><code class="docutils literal"><span class="pre">exchange_name</span></code>: The name of the targeted exchange. See the
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<a class="reference external" href="https://github.com/ccxt/ccxt/wiki/Exchange-Markets">CCXT Supported Exchanges</a>
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for the full list.</li>
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<li><code class="docutils literal"><span class="pre">algo_namespace</span></code>: A arbitrary label assigned to your algorithm for
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data storage purposes.</li>
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<li><code class="docutils literal"><span class="pre">base_currency</span></code>: The base currency used to calculate the
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statistics of your algorithm. Currently, the base currency of all
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trading pairs of your algorithm must match this value.</li>
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<li><code class="docutils literal"><span class="pre">simulate_orders</span></code>: Enables the paper trading mode, in which orders are
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simulated in Catalyst instead of processed on the exchange. It defaults to
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<code class="docutils literal"><span class="pre">True</span></code>.</li>
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<li><code class="docutils literal"><span class="pre">end_date</span></code>: When setting the end_date to a time in the <strong>future</strong>,
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it will schedule the live algo to finish gracefully at the specified date.</li>
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<li><code class="docutils literal"><span class="pre">start_date</span></code>: (<strong>Will be implemented in the future</strong>)
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The live algo starts by default in the present, as mentioned above.
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by setting the start_date to a time in the future, the algorithm would
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essentially sleep and when the predefined time comes, it would start executing.</li>
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</ul>
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<p>The <cite>catalyst live</cite> command offers additional parameters.
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You can learn more by running the following from the command line:</p>
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<div class="highlight-bash"><div class="highlight"><pre><span></span>catalyst live --help
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</pre></div>
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</div>
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<p>Here is a complete algorithm for reference:
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<a class="reference external" href="https://github.com/enigmampc/catalyst/blob/master/catalyst/examples/buy_low_sell_high_live.py">Buy Low and Sell High</a></p>
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</div>
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</div>
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