A read only balance tracker
several approaches, just wondering about the public keys, that you mention... wouldn't you have "amounts", that should be multiplied by current value (in Euro or Dollars) per currency? Then this:

http://www.coindetail.com/

alternativly the el-cheapo version at the command line, which I cut&amp;paste into an ods (xls) or similiar:

#!/bin/sh
####################################################################
### an 'el cheapo' approach to fetch data from coinmarketcap.com ###
####################################################################

log_fn=ccy_values.log

echo "`date '+%Y-%B-%d'`"                       &gt; $log_fn
echo "`date '+%H:%M'`"                         &gt;&gt; $log_fn
echo "running ccy_values.sh on `hostname -s`"  &gt;&gt; $log_fn
echo " " &gt;&gt; $log_fn

today="`date '+%y%m%d%H%M'`"

wget -q -O - https://api.coinmarketcap.com/v1/ticker/bitcoin/?convert=EUR   &gt; /Data/tmp/tmp_$today.tmp
wget -q -O - https://api.coinmarketcap.com/v1/ticker/ethereum/?convert=EUR &gt;&gt; /Data/tmp/tmp_$today.tmp
wget -q -O - https://api.coinmarketcap.com/v1/ticker/aeon/?convert=EUR     &gt;&gt; /Data/tmp/tmp_$today.tmp
wget -q -O - https://api.coinmarketcap.com/v1/ticker/siacoin/?convert=EUR  &gt;&gt; /Data/tmp/tmp_$today.tmp
wget -q -O - https://api.coinmarketcap.com/v1/ticker/storj/?convert=EUR    &gt;&gt; /Data/tmp/tmp_$today.tmp
wget -q -O - https://api.coinmarketcap.com/v1/ticker/storjcoin-x/?convert=EUR    &gt;&gt; /Data/tmp/tmp_$today.tmp
cat /Data/tmp/tmp_$today.tmp | grep -e "id" -e "price_btc" -e "price_eur" | sed -e 's/"//g' -e 's/,/ /g' &gt; $log_fn

# create terminal output 
tail -n 18 $log_fn | awk 'BEGIN { print "Currency (source: coinmarketcap.com)\tConversion Rate (Bitcoin)\tin EUR"} { ORS=""; print $2; if( NR % 3 == 0) print "\n"; else print "\t";}'