Alpaca API python client

Project description

alpaca-trade-api-python

alpaca-trade-api-python is a python library for the Alpaca Commission Free Trading API. It allows rapid trading algo development easily, with support for both REST and streaming data interfaces. For details of each API behavior, please see the online API document.

Note that this package supports only python version 3.6 and above, due to the async/await and websockets module dependency.

Install

We support python>=3.6. If you want to work with python 3.6, please note that these package dropped support for python <3.7 for the following versions:

pandas >= 1.2.0
numpy >= 1.20.0
scipy >= 1.6.0

The solution - manually install these package before installing alpaca-trade-api. e.g:

pip install pandas==1.1.5 numpy==1.19.4 scipy==1.5.4

Also note that we do not limit the version of the websockets library, but we advice using

websockets>=9.0

Installing using pip

$ pip3 install alpaca-trade-api

API Keys

To use this package you first need to obtain an API key. Go here to signup

Services

These services are provided by Alpaca:

Data:
- Historical
- Live Data Stream
Account/Portfolio Management

The free services are limited, please check the docs to see the differences between paid/free services.

Alpaca Environment Variables

The Alpaca SDK will check the environment for a number of variables that can be used rather than hard-coding these into your scripts.
Alternatively you could pass the credentials directly to the SDK instances.

Environment	default	Description
APCA_API_KEY_ID=<key_id>		Your API Key
APCA_API_SECRET_KEY=<secret_key>		Your API Secret Key
APCA_API_BASE_URL=url	https://api.alpaca.markets (for live)	Specify the URL for API calls, Default is live, you must specify https://paper-api.alpaca.markets to switch to paper endpoint!
APCA_API_DATA_URL=url	https://data.alpaca.markets	Endpoint for data API
APCA_RETRY_MAX=3	3	The number of subsequent API calls to retry on timeouts
APCA_RETRY_WAIT=3	3	seconds to wait between each retry attempt
APCA_RETRY_CODES=429,504	429,504	comma-separated HTTP status code for which retry is attempted
DATA_PROXY_WS		When using the alpaca-proxy-agent you need to set this environment variable as described

Working with Data

Historic Data

You could get one of these historic data types:

Bars
Quotes
Trades

You now have 2 pythonic ways to retrieve historical data.
One using the traditional rest module and the other is to use the experimental asyncio module added lately.
Let's have a look at both:

First thing to understand is the new data polling mechanism. You could query up to 10000 items, and the API is using a pagination mechanism to provide you with the data.
You now have 2 options:

Working with data as it is received with a generator. (meaning it's faster but you need to process each item alone)
Wait for the entire data to be received, and then work with it as a list or dataframe. We provide you with both options to choose from.

Bars

option 1: wait for the data

from alpaca_trade_api.rest import REST, TimeFrame
api = REST()

api.get_bars("AAPL", TimeFrame.Hour, "2021-06-08", "2021-06-08", adjustment='raw').df

                              open      high       low     close    volume
timestamp                                                                 
2021-06-08 08:00:00+00:00  126.100  126.3000  125.9600  126.3000     42107
2021-06-08 09:00:00+00:00  126.270  126.4000  126.2200  126.3800     21095
2021-06-08 10:00:00+00:00  126.380  126.6000  125.8400  126.4900     54743
2021-06-08 11:00:00+00:00  126.440  126.8700  126.4000  126.8500    206460
2021-06-08 12:00:00+00:00  126.821  126.9500  126.7000  126.9300    385164
2021-06-08 13:00:00+00:00  126.920  128.4600  126.4485  127.0250  18407398
2021-06-08 14:00:00+00:00  127.020  127.6400  126.7800  127.1350  13446961
2021-06-08 15:00:00+00:00  127.140  127.4700  126.2101  126.6100  10444099
2021-06-08 16:00:00+00:00  126.610  126.8400  126.5300  126.8250   5289556
2021-06-08 17:00:00+00:00  126.820  126.9300  126.4300  126.7072   4813459
2021-06-08 18:00:00+00:00  126.709  127.3183  126.6700  127.2850   5338455
2021-06-08 19:00:00+00:00  127.290  127.4200  126.6800  126.7400   9817083
2021-06-08 20:00:00+00:00  126.740  126.8500  126.5400  126.6600   5525520
2021-06-08 21:00:00+00:00  126.690  126.8500  126.6500  126.6600    156333
2021-06-08 22:00:00+00:00  126.690  126.7400  126.6600  126.7300     49252
2021-06-08 23:00:00+00:00  126.725  126.7600  126.6400  126.6400     41430

option 2: iterate over bars

def process_bar(bar):
    # process bar
    print(bar)

bar_iter = api.get_bars_iter("AAPL", TimeFrame.Hour, "2021-06-08", "2021-06-08", adjustment='raw')
for bar in bar_iter:
    process_bar(bar)

Alternatively, you can decide on your custom timeframes by using the TimeFrame constructor:

from alpaca_trade_api.rest import REST, TimeFrame, TimeFrameUnit

api = REST()
api.get_bars("AAPL", TimeFrame(45, TimeFrameUnit.Minute), "2021-06-08", "2021-06-08", adjustment='raw').df

                               open      high       low     close    volume  trade_count        vwap
timestamp                                                                                           
2021-06-08 07:30:00+00:00  126.1000  126.1600  125.9600  126.0600     20951          304  126.049447
2021-06-08 08:15:00+00:00  126.0500  126.3000  126.0500  126.3000     21181          349  126.231904
2021-06-08 09:00:00+00:00  126.2700  126.3200  126.2200  126.2800     15955          308  126.284120
2021-06-08 09:45:00+00:00  126.2900  126.4000  125.9000  125.9000     30179          582  126.196877
2021-06-08 10:30:00+00:00  125.9000  126.7500  125.8400  126.7500    105380         1376  126.530863
2021-06-08 11:15:00+00:00  126.7300  126.8500  126.5600  126.8300    129721         1760  126.738041
2021-06-08 12:00:00+00:00  126.4101  126.9500  126.3999  126.8300    418107         3615  126.771889
2021-06-08 12:45:00+00:00  126.8500  126.9400  126.6000  126.6200    428614         5526  126.802825
2021-06-08 13:30:00+00:00  126.6200  128.4600  126.4485  127.4150  23065023       171263  127.425797
2021-06-08 14:15:00+00:00  127.4177  127.6400  126.9300  127.1350   8535068        65753  127.342337
2021-06-08 15:00:00+00:00  127.1400  127.4700  126.2101  126.7101   8447696        64616  126.789316
2021-06-08 15:45:00+00:00  126.7200  126.8200  126.5300  126.6788   5084147        38366  126.712110
2021-06-08 16:30:00+00:00  126.6799  126.8400  126.5950  126.5950   3205870        26614  126.718837
2021-06-08 17:15:00+00:00  126.5950  126.9300  126.4300  126.7010   3908283        31922  126.665727
2021-06-08 18:00:00+00:00  126.7072  127.0900  126.6700  127.0600   3923056        29114  126.939887
2021-06-08 18:45:00+00:00  127.0500  127.4200  127.0000  127.0050   5051682        38235  127.214157
2021-06-08 19:30:00+00:00  127.0150  127.0782  126.6800  126.7800  11665598        47146  126.813182
2021-06-08 20:15:00+00:00  126.7700  126.7900  126.5400  126.6600     83725         1973  126.679259
2021-06-08 21:00:00+00:00  126.6900  126.8500  126.6700  126.7200    145153          769  126.746457
2021-06-08 21:45:00+00:00  126.7000  126.7400  126.6500  126.7100     38455          406  126.699544
2021-06-08 22:30:00+00:00  126.7100  126.7600  126.6700  126.7100     30822          222  126.713892
2021-06-08 23:15:00+00:00  126.7200  126.7600  126.6400  126.6400     32585          340  126.704131

Quotes

option 1: wait for the data

from alpaca_trade_api.rest import REST
api = REST()

api.get_quotes("AAPL", "2021-06-08", "2021-06-08", limit=10).df

                                    ask_exchange  ask_price  ask_size bid_exchange  bid_price  bid_size conditions
timestamp                                                                                                         
2021-06-08 08:00:00.070928640+00:00            P     143.00         1                    0.00         0        [Y]
2021-06-08 08:00:00.070929408+00:00            P     143.00         1            P     102.51         1        [R]
2021-06-08 08:00:00.070976768+00:00            P     143.00         1            P     116.50         1        [R]
2021-06-08 08:00:00.070978816+00:00            P     143.00         1            P     118.18         1        [R]
2021-06-08 08:00:00.071020288+00:00            P     143.00         1            P     120.00         1        [R]
2021-06-08 08:00:00.071020544+00:00            P     134.18         1            P     120.00         1        [R]
2021-06-08 08:00:00.071021312+00:00            P     134.18         1            P     123.36         1        [R]
2021-06-08 08:00:00.071209984+00:00            P     131.11         1            P     123.36         1        [R]
2021-06-08 08:00:00.071248640+00:00            P     130.13         1            P     123.36         1        [R]
2021-06-08 08:00:00.071286016+00:00            P     129.80         1            P     123.36         1        [R]

option 2: iterate over quotes

def process_quote(quote):
    # process quote
    print(quote)

quote_iter = api.get_quotes_iter("AAPL", "2021-06-08", "2021-06-08", limit=10)
for quote in quote_iter:
    process_quote(quote)

Trades

option 1: wait for the data

from alpaca_trade_api.rest import REST
api = REST()

api.get_trades("AAPL", "2021-06-08", "2021-06-08", limit=10).df

                                    exchange   price  size conditions  id tape
timestamp                                                                     
2021-06-08 08:00:00.069956608+00:00        P  126.10   179     [@, T]   1    C
2021-06-08 08:00:00.207859+00:00           K  125.97     1  [@, T, I]   1    C
2021-06-08 08:00:00.207859+00:00           K  125.97    12  [@, T, I]   2    C
2021-06-08 08:00:00.207859+00:00           K  125.97     4  [@, T, I]   3    C
2021-06-08 08:00:00.207859+00:00           K  125.97     4  [@, T, I]   4    C
2021-06-08 08:00:00.207859+00:00           K  125.97     8  [@, T, I]   5    C
2021-06-08 08:00:00.207859+00:00           K  125.97     1  [@, T, I]   6    C
2021-06-08 08:00:00.207859+00:00           K  126.00    30  [@, T, I]   7    C
2021-06-08 08:00:00.207859+00:00           K  126.00    10  [@, T, I]   8    C
2021-06-08 08:00:00.207859+00:00           K  125.97    70  [@, T, I]   9    C

option 2: iterate over trades

def process_trade(trade):
    # process trade
    print(trade)

trades_iter = api.get_trades_iter("AAPL", "2021-06-08", "2021-06-08", limit=10)
for trade in trades_iter:
    process_trade(trade)

Asyncio Rest module

The rest_async.py module now provides an asyncion approach to retrieving the historic data.
This module is, and thus may have expansions in the near future to support more endpoints.
It provides a much faster way to retrieve the historic data for multiple symbols.
Under the hood we use the aiohttp library.
We provide a code sample to get you started with this new approach and it is located here.
Follow along the example code to learn more, and to utilize it to your own needs.

Live Stream Data

There are 2 streams available as described here.
The free plan is using the iex stream, while the paid subscription is using the sip stream.
You could subscribe to bars, trades or quotes and trade updates as well.
Under the example folder you could find different code samples to achieve different goals. Let's see the basic example
We present a new Streamer class under alpaca_trade_api.stream for API V2.

from alpaca_trade_api.stream import Stream

async def trade_callback(t):
    print('trade', t)


async def quote_callback(q):
    print('quote', q)


# Initiate Class Instance
stream = Stream(<ALPACA_API_KEY>,
                <ALPACA_SECRET_KEY>,
                base_url=URL('https://paper-api.alpaca.markets'),
                data_feed='iex')  # <- replace to SIP if you have PRO subscription

# subscribing to event
stream.subscribe_trades(trade_callback, 'AAPL')
stream.subscribe_quotes(quote_callback, 'IBM')

stream.run()

Account & Portfolio Management

The HTTP API document is located at https://docs.alpaca.markets/

API Version

API Version now defaults to 'v2', however, if you still have a 'v1' account, you may need to specify api_version='v1' to properly use the API until you migrate.

Authentication

The Alpaca API requires API key ID and secret key, which you can obtain from the web console after you sign in. You can pass key_id and secret_key to the initializers of REST or StreamConn as arguments, or set up environment variables as outlined below.

REST

The REST class is the entry point for the API request. The instance of this class provides all REST API calls such as account, orders, positions, and bars.

Each returned object is wrapped by a subclass of the Entity class (or a list of it). This helper class provides property access (the "dot notation") to the json object, backed by the original object stored in the _raw field. It also converts certain types to the appropriate python object.

import alpaca_trade_api as tradeapi

api = tradeapi.REST()
account = api.get_account()
account.status
=> 'ACTIVE'

The Entity class also converts the timestamp string field to a pandas.Timestamp object. Its _raw property returns the original raw primitive data unmarshaled from the response JSON text.

Please note that the API is throttled, currently 200 requests per minute, per account. If your client exceeds this number, a 429 Too many requests status will be returned and this library will retry according to the retry environment variables as configured.

If the retries are exceeded, or other API error is returned, alpaca_trade_api.rest.APIError is raised. You can access the following information through this object.

the API error code: .code property
the API error message: str(error)
the original request object: .request property
the original response object: .response property
the HTTP status code: .status_code property

API REST Methods

Rest Method	End Point	Result
get_account()	`GET /account` and	`Account` entity.
get_order_by_client_order_id(client_order_id)	`GET /orders` with client_order_id	`Order` entity.
list_orders(status=None, limit=None, after=None, until=None, direction=None, nested=None)	`GET /orders`	list of `Order` entities. `after` and `until` need to be string format, which you can obtain by `pd.Timestamp().isoformat()`
submit_order(symbol, qty=None, side="buy", type="market", time_in_force="day", limit_price=None, stop_price=None, client_order_id=None, order_class=None, take_profit=None, stop_loss=None, trail_price=None, trail_percent=None, notional=None)	`POST /orders`	`Order` entity.
get_order(order_id)	`GET /orders/{order_id}`	`Order` entity.
cancel_order(order_id)	`DELETE /orders/{order_id}`
cancel_all_orders()	`DELETE /orders`
list_positions()	`GET /positions`	list of `Position` entities
get_position(symbol)	`GET /positions/{symbol}`	`Position` entity.
list_assets(status=None, asset_class=None)	`GET /assets`	list of `Asset` entities
get_asset(symbol)	`GET /assets/{symbol}`	`Asset` entity
get_barset(symbols, timeframe, limit, start=None, end=None, after=None, until=None)	`GET /bars/{timeframe}`	Barset with `limit` Bar objects for each of the the requested symbols. `timeframe` can be one of `minute`, `1Min`, `5Min`, `15Min`, `day` or `1D`. `minute` is an alias of `1Min`. Similarly, `day` is an alias of `1D`. `start`, `end`, `after`, and `until` need to be string format, which you can obtain with `pd.Timestamp().isoformat()` `after` cannot be used with `start` and `until` cannot be used with `end`.
get_aggs(symbol, timespan, multiplier, _from, to)	`GET /aggs/ticker/{symbol}/range/{multiplier}/{timespan}/{from}/{to}`	`Aggs` entity. `multiplier` is the size of the timespan multiplier. `timespan` is the size of the time window, can be one of `minute`, `hour`, `day`, `week`, `month`, `quarter` or `year`. `_from` and `to` must be in `YYYY-MM-DD` format, e.g. `2020-01-15`.
get_last_trade(symbol)	`GET /last/stocks/{symbol}`	`Trade` entity
get_last_quote(symbol)	`GET /last_quote/stocks/{symbol}`	`Quote` entity
get_clock()	`GET /clock`	`Clock` entity
get_calendar(start=None, end=None)	`GET /calendar`	`Calendar` entity
get_portfolio_history(date_start=None, date_end=None, period=None, timeframe=None, extended_hours=None)	`GET /account/portfolio/history`	PortfolioHistory entity. PortfolioHistory.df can be used to get the results as a dataframe

Rest Examples

Please see the examples/ folder for some example scripts that make use of this API

Using `submit_order()`

Below is an example of submitting a bracket order.

api.submit_order(
    symbol='SPY',
    side='buy',
    type='market',
    qty='100',
    time_in_force='day',
    order_class='bracket',
    take_profit=dict(
        limit_price='305.0',
    ),
    stop_loss=dict(
        stop_price='295.5',
        limit_price='295.5',
    )
)

For simple orders with type='market' and time_in_force='day', you can pass a fractional amount (qty) or a notional amount (but not both). For instance, if the current market price for SPY is $300, the following calls are equivalent:

api.submit_order(
    symbol='SPY',
    qty=1.5,  # fractional shares
    side='buy',
    type='market',
    time_in_force='day',
)

api.submit_order(
    symbol='SPY',
    notional=450,  # notional value of 1.5 shares of SPY at $300
    side='buy',
    type='market',
    time_in_force='day',
)

Using `get_barset()` (Deprecated. use `get_bars()` instead)

import pandas as pd
NY = 'America/New_York'
start=pd.Timestamp('2020-08-01', tz=NY).isoformat()
end=pd.Timestamp('2020-08-30', tz=NY).isoformat()
print(api.get_barset(['AAPL', 'GOOG'], 'day', start=start, end=end).df)

# Minute data example
start=pd.Timestamp('2020-08-28 9:30', tz=NY).isoformat()
end=pd.Timestamp('2020-08-28 16:00', tz=NY).isoformat()
print(api.get_barset(['AAPL', 'GOOG'], 'minute', start=start, end=end).df)

please note that if you are using limit, it is calculated from the end date. and if end date is not specified, "now" is used.
Take that under consideration when using start date with a limit.

Debugging

Websocket exceptions may occur during execution. It will usually happen during the consume() method, which basically is the websocket steady-state.
exceptions during the consume method may occur due to:

server disconnections
error while handling the response data

We handle the first issue by reconnecting the websocket every time there's a disconnection. The second issue, is usually a user's code issue. To help you find it, we added a flag to the StreamConn object called debug. It is set to False by default, but you can turn it on to get a more verbose logs when this exception happens. Turn it on like so StreamConn(debug=True)

Logging

You should define a logger in your app in order to make sure you get all the messages from the different components.
It will help you debug, and make sure you don't miss issues when they occur.
The simplest way to define a logger, if you have no experience with the python logger - will be something like this:

import logging
logging.basicConfig(format='%(asctime)s %(message)s', level=logging.INFO)

Websocket best practices

Under the examples folder you could find several examples to do the following:

Different subscriptions(channels) usage with the alpaca streams
pause / resume connection
change subscriptions/channels of existing connection
ws disconnections handler (make sure we reconnect when the internal mechanism fails)

Running Multiple Strategies

The base version of this library only allows running a single algorithm due to Alpaca's limit of one websocket connection per account. For those looking to run multiple strategies, there is alpaca-proxy-agent project.

The steps to execute this are:

Run the Alpaca Proxy Agent as described in the project's README
Define a new environment variable: DATA_PROXY_WS set to the address of the proxy agent. (e.g: DATA_PROXY_WS=ws://127.0.0.1:8765)
If you are using the Alpaca data stream, make sure to initiate the StreamConn object with the container's url: data_url='http://127.0.0.1:8765'
Execute your algorithm. It will connect to the Alpaca servers through the proxy agent, allowing you to execute multiple strategies

Raw Data vs Entity Data

By default the data returned from the api or streamed via StreamConn is wrapped with an Entity object for ease of use. Some users may prefer working with vanilla python objects (lists, dicts, ...). You have 2 options to get the raw data:

Each Entity object as a _raw property that extract the raw data from the object.
If you only want to work with raw data, and avoid casting to Entity (which may take more time, casting back and forth) you could pass raw_data argument to Rest() object or the StreamConn() object.

Support and Contribution

For technical issues particular to this module, please report the issue on this GitHub repository. Any API issues can be reported through Alpaca's customer support.

New features, as well as bug fixes, by sending a pull request is always welcomed.

Project details

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alpaca-trade-api 1.4.3

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alpaca-trade-api-python

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Using `submit_order()`

Using `get_barset()` (Deprecated. use `get_bars()` instead)