As you may read in my last beem update, I released version 0.19.36. The command line tool beempy has now a robust price feed publish function for witnesses.
What does robust mean?
The other available price feed tools have the problem that a working full-node has to be set. Otherwise, the feed cannot be broadcasted. Robust means that broadcasting is always possible, no matter if all but one full node are failing.
Why is beempy robust?
beempy can be used together with updatenodes, which receives an hourly updated full-node configuration. You can see the hourly account updates here: https://steemd.com/@fullnodeupdate
beempy updatenodes fetches the actual node configuration and is building a score. All nodes with positive score are than set as default nodes.
Price feed publishing
The price feed can be published with beempy witnessfeed. --support-peg can be set to support peg. If not set, quote is always 1 STEEM.
The base price is calculated from btc_usd and steem_usd prices similar to the conductor from 
"https://api.bitfinex.com/v1/pubticker/BTCUSD",
"https://api.gdax.com/products/BTC-USD/ticker",
"https://api.kraken.com/0/public/Ticker?pair=XBTUSD",
"https://www.okcoin.com/api/v1/ticker.do?symbol=btc_usd",
"https://www.bitstamp.net/api/v2/ticker/btcusd/",
and for STEEM_BTC:
"https://poloniex.com/public?command=returnTicker",
"https://bittrex.com/api/v1.1/public/getmarketsummary?market=BTC-STEEM",
"https://api.binance.com/api/v1/ticker/24hr",
SBD_USD (only needed when supporting PEG) is calculated from the internal market.
Installing and setting up beempy
The alternative package installer pip/pip3 for python3 is needed. It can be installed on ubuntu by:
sudo apt-get install python3-pip
In the next step, beem is installed for the current user by:
pip3 install beem -U --user
In the first step, a new wallet should be created:
beempy createwallet
The active key of the witness account has to be stored in the wallet:
beempy addkey
We need to know where beempy is installed:
which beempy
I wrote a small script for unlocking the wallet, updating the nodes and publishing a price feed:
#!/bin/bash
export UNLOCK='secret_password'
/home/holger80/.local/bin/beempy updatenodes
/home/holger80/.local/bin/beempy witnessfeed holger80
I saved this script as update_feed and added it to a crontab by runningcrontab -e and entering:
0 * * * * (sh /home/holger80/update_feed) >> /tmp/crontab.log 2>&1
You can check /etc/crontab.log if everything is working fine.
If you like what I'm doing, please consider 