cryptofeed 0.17.3

Cryptocurrency feed handler and synthetic NBBO feed

Cryptocurrency Exchange Feed Handler
====================================

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Handles multiple feeds and returns normalized and standardized results
across exchanges to client registered callbacks for events like trades,
book updates, ticker updates, etc.

Please see the `examples </examples>`__ for more code samples.

.. code:: python

from cryptofeed import FeedHandler

fh = FeedHandler()

# ticker, trade, and book are user defined functions that
# will be called when ticker, trade and book updates are received
ticker_cb = {TICKER: TickerCallback(ticker)}
trade_cb = {TRADES: TradeCallback(trade)}
gemini_cb = {TRADES: TradeCallback(trade), L3_BOOK: BookCallback(book)}


fh.add_feed(Coinbase(pairs=['BTC-USD'], channels=[TICKER], callbacks=ticker_cb)
fh.add_feed(Bitfinex(pairs=['BTC-USD'], channels=[TICKER], callbacks=ticker_cb)
fh.add_feed(Poloniex(channels=['USDT-BTC'], callbacks=trade_cb))
fh.add_feed(Gemini(pairs=['BTC-USD'], callbacks=gemini_cb)

fh.run()

Supports the following exchanges:

- Bitfinex
- Coinbase
- Poloniex
- Gemini
- HitBTC
- Bitstamp
- BitMEX
- Kraken
- Binance

Also provides a synthetic NBBO (National Best Bid/Offer) feed that
aggregates the best bids and asks from the user specified feeds.

.. code:: python

from cryptofeed.feedhandler import FeedHandler
from cryptofeed import Coinbase, Bitfinex, HitBTC


def nbbo_ticker(pair, bid, ask, bid_feed, ask_feed):
print('Pair: {} Bid: {} Bid Feed: {} Ask: {} Ask Feed: {}'.format(pair,
bid,
bid_feed,
ask,
ask_feed))


fh = FeedHandler()
fh.add_nbbo([Coinbase, Bitfinex, HitBTC], ['BTC-USD'], nbbo_ticker)
fh.run()

Supported Channels
------------------

Cryptofeed supports the following channels:

- L2\_BOOK - Price aggregated sizes. Some exchanges provide the entire
depth, some provide a subset.
- L3\_BOOK - Price aggregated orders. Like the L2 book, some exchanges
may only provide partial depth.
- TRADES
- TICKER
- VOLUME
- FUNDING
- BOOK\_DELTA - Subscribed to with L2 or L3 books, receive book deltas
rather than the entire book on updates. Full updates will be
periodically sent on the L2 or L3 channel. If BOOK\_DELTA is enabled,
only L2 or L3 book can be enabled, not both. To received both create
two ``feedhandler`` objects.

Backends
--------

Cryptofeeds supports ``backend`` callbacks that will write directly to
storage or other interfaces

Supported Backends:

- Redis
- `Arctic <https://github.com/manahl/arctic>`__
- ZeroMQ
- UDP Sockets
- TCP Sockets
- Unix Domain Sockets

Rest API
--------

Cryptofeed supports some REST interfaces for retrieving historical data
and placing orders. See the `rest </cryptofeed/rest>`__ package.

Planned Work
============

Future Feeds
~~~~~~~~~~~~

- EXX
- CEX
- BTCC
- Many more...

REST
~~~~

Continue to build out rest endpoints

Additional Callback Methods / Backends
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- Postgres
- InfluxDB
- RabbitMQ

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