fetch_free.sh

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#!bin/bash
 
mkdir -p /tmp/tokens
 
# Calculate number of entries
readonly num_lines=$(wc -l < pairs.txt)
current_line=0
 
# Fetch JSON for each currency pair
cat pairs.txt | while read line; do
 
    # Break out if there's a blank line
    [[ -z $line ]] && break
 
    # Tokenise the line
    if [[ $line =~ ([0-9A-Z]+)[[:space:]]+([0-9A-Z]+)[[:space:]]+([A-Za-z]+) ]]; then
 
        from=${BASH_REMATCH[1]}
        to=${BASH_REMATCH[2]}
        exchange=${BASH_REMATCH[3]}
        period=hour
 
        # Dump the JSON to tmp
        json_filename=/tmp/tokens/$exchange-$from-$to.json
        echo "[$current_line/$num_lines] $from-$to @ $exchange written to $json_filename"
 
        # Get prices
        curl --silent "https://min-api.cryptocompare.com/data/histo$period?fsym=$from&tsym=$to&e=$exchange&limit=2000" > $json_filename    
        sleep 0.5
 
        # Increment counter
        current_line=$((current_line + 1))
    fi
done
 
echo
ls -l /tmp/tokens/*.json