diff --git a/fake-coinjoin.sh b/fake-coinjoin.sh
index ab5ee6a..c6d6dc1 100755
--- a/fake-coinjoin.sh
+++ b/fake-coinjoin.sh
@@ -16,6 +16,8 @@ fi
 # Values below 1000 are treated as estimated blocks to confirm,
 # 1000 and above as sat/kB.
 tx_fees=3
+# [fraction, 0-1] / variance around the average fee. Ex: 1000 fee, 0.2 var = fee is btw 800-1200
+txfee_factor=0.3
 # Abort if TX fee per KB is above this number (satoshis)
 absurd_fee_per_kb=150000
 # Coin selection ("merge") algorithm.
@@ -43,9 +45,12 @@ else
         exit 1
     fi
 fi
+fee="$(randamount \
+    "$(bc_float_calc "$fee * (1 - $txfee_factor)")" \
+    "$(bc_float_calc "$fee * (1 + $txfee_factor)")")"
 mempoolminfee="$(call_bitcoin_cli getmempoolinfo | jq_btc_float ".mempoolminfee")"
 if is_btc_lt "$fee" "$mempoolminfee"; then
-    echo "Fee $fee is below minimum mempool fee, raising to $mempoolminfee"
+    echo "Feerate $fee is below minimum mempool fee, raising to $mempoolminfee"
     fee="$mempoolminfee"
 fi
 if is_btc_gte "$fee" "$(bc_float_calc "$absurd_fee_per_kb * 0.00000001")"; then
diff --git a/inc.common.sh b/inc.common.sh
index 993e655..f822683 100644
--- a/inc.common.sh
+++ b/inc.common.sh
@@ -174,6 +174,15 @@ function is_btc_lt()
         $(echo "$2" | btc_amount_format | tr -d '.' | sed 's/^0*//' | sed 's/^$/0/') \
     ))
 }
+# is "$1" less than or equal to "$2"
+function is_btc_lte()
+{
+    (( \
+        $(echo "$1" | btc_amount_format | tr -d '.' | sed 's/^0*//' | sed 's/^$/0/') \
+            <= \
+        $(echo "$2" | btc_amount_format | tr -d '.' | sed 's/^0*//' | sed 's/^$/0/') \
+    ))
+}
 
 function is_valid_bitcoin_address()
 {
@@ -518,3 +527,11 @@ function bip21_get_param()
         fi
     fi
 }
+
+function randamount()
+{
+    minamount="$1"
+    maxamount="$2"
+    diff="$(bc_float_calc "$maxamount - $minamount")"
+    bc_float_calc "$minamount + $RANDOM * $diff * 0.00003055581"
+}
diff --git a/randbtc.sh b/randbtc.sh
index e293ca4..736e058 100755
--- a/randbtc.sh
+++ b/randbtc.sh
@@ -1,4 +1,4 @@
-#! /bin/bash
+#!/usr/bin/env bash
 
 . $(dirname $0)/inc.common.sh
 
@@ -7,10 +7,4 @@ if [ "$2" == "" ]; then
     exit
 fi
 
-minamount=$1
-maxamount=$2
-
-diff=$(bc_float_calc "$maxamount - $minamount")
-
-bc_float_calc "$minamount + $RANDOM * $diff * 0.00003055581"
-
+randamount "$1" "$2"
diff --git a/ricochet-send-from.sh b/ricochet-send-from.sh
index f1e9adc..3187770 100755
--- a/ricochet-send-from.sh
+++ b/ricochet-send-from.sh
@@ -3,15 +3,16 @@
 . $(dirname $0)/inc.common.sh
 
 if [ "$2" == "" ]; then
-    echo "Usage: $(basename $0) [options] source_address destination_address [hops [fee [sleeptime_min [sleeptime_max [hop_confirmations]]]]]"
+    echo "Usage: $(basename $0) [options] source_address destination_address [hops [txfee [sleeptime_min [sleeptime_max [hop_confirmations [txfee_factor]]]]]]"
     echo "Where:"
     echo "  source_address      - source address (all funds from that address will be send)"
     echo "  destination_address - destination address"
     echo "  hops                - number of hops (default: 5)"
-    echo "  fee                 - transaction fee per kW (default: \"estimatesmartfee 2\", currently $($(dirname $0)/estimatesmartfee.sh $bitcoin_cli_options 2) BTC)"
+    echo "  txfee               - average transaction fee per kvB (default: \"estimatesmartfee 2\", currently $($(dirname $0)/estimatesmartfee.sh $bitcoin_cli_options 2) BTC)"
     echo "  sleeptime_min       - minimum sleep time between hops in seconds (default: 10)"
     echo "  sleeptime_max       - maximum sleep time between hops in seconds (default: 15)"
     echo "  hop_confirmations   - minimum number of confirmations between hops (default: 0)"
+    echo "  txfee_factor        - variance around average transaction fee, e.g. 0.00002000 fee, 0.2 var = fee is between 0.00001600 and 0.00002400 (default: 0.3)"
     exit
 fi
 
@@ -36,9 +37,9 @@ if [ "$3" != "" ]; then
     hops=$3
 fi
 if [ "$4" != "" ]; then
-    fee=$4
+    txfee="$4"
 else
-    fee=$($(dirname $0)/estimatesmartfee.sh $bitcoin_cli_options 2)
+    txfee="$($(dirname $0)/estimatesmartfee.sh $bitcoin_cli_options 2)"
 fi
 if [ "$6" != "" ]; then
     sleeptime_min=$5
@@ -52,13 +53,19 @@ if [ "$7" != "" ]; then
 else
     hop_confirmations=0
 fi
+if [ "$8" != "" ]; then
+    txfee_factor="$8"
+else
+    txfee_factor="0.3"
+fi
 
 # Force minimum required fee
-fee="$(echo "$fee" | btc_amount_format)"
+txfee_min="$(bc_float_calc "$txfee * (1 - $txfee_factor)")"
+txfee_max="$(bc_float_calc "$txfee * (1 + $txfee_factor)")"
 mempoolminfee="$(call_bitcoin_cli getmempoolinfo | jq_btc_float ".mempoolminfee")"
-if is_btc_lt "$fee" "$mempoolminfee"; then
-    echo "Fee $fee is below minimum mempool fee, raising to $mempoolminfee"
-    fee="$mempoolminfee"
+if is_btc_lt "$txfee_min" "$mempoolminfee"; then
+    echo "Feerate $txfee_min is below minimum mempool fee, raising minimum to $mempoolminfee"
+    txfee_min="$mempoolminfee"
 fi
 
 utxo="$(call_bitcoin_cli listunspent 0 999999 "[\"$source_address\"]" false)"
@@ -75,7 +82,8 @@ if [ "${#utxo_txids[@]}" == "0" ]; then
     exit 2
 fi
 
-echo "Ricocheting from $source_address ($send_amount BTC) to $destination_address via $hops hops using $fee fee per KB"
+txfee_average="$(bc_float_calc "($txfee_min + $txfee_max) * 0.5")"
+echo "Ricocheting from $source_address ($send_amount BTC) to $destination_address via $hops hops using average $txfee_average fee per kvB"
 read -p "Is this ok? " -n 1 -r
 echo
 
@@ -138,6 +146,7 @@ for i in $(seq 0 $(( ${#utxo_txids[@]} - 1 )) ); do
     needs_comma=1
 done
 rawtx_inputs="$rawtx_inputs]"
+fee="$(randamount "$txfee_min" "$txfee_max")"
 send_amount=$(bc_float_calc "$send_amount - $(bc_float_calc "$tx_vsize * $fee * 0.001")")
 rawtx=$(call_bitcoin_cli createrawtransaction "$rawtx_inputs" "{\"${ricochet_addresses[$(( $hops - 1 ))]}\":$send_amount}")
 signedtx=$(signrawtransactionwithwallet "$rawtx")
@@ -183,7 +192,7 @@ for i in $(seq 1 $(( $hops - 1)) | tac); do
             tx_vsize=$(calc_tx_vsize 0 0 1 0 0 1)
         fi
     fi
-
+    fee="$(randamount "$txfee_min" "$txfee_max")"
     send_amount=$(bc_float_calc "$send_amount - $(bc_float_calc "$tx_vsize * $fee * 0.001")")
     echo -n "$j: ${ricochet_addresses[$i]} -> ${ricochet_addresses[$(( $i - 1 ))]} ($send_amount) - "
     rawtx=$(call_bitcoin_cli createrawtransaction "[{\"txid\":\"$use_txid\",\"vout\":0}]" "{\"${ricochet_addresses[$(( $i - 1 ))]}\":$send_amount}")
diff --git a/ricochet-send.sh b/ricochet-send.sh
index b9b98e9..fc33271 100755
--- a/ricochet-send.sh
+++ b/ricochet-send.sh
@@ -3,15 +3,16 @@
 . $(dirname $0)/inc.common.sh
 
 if [ "$2" == "" ]; then
-    echo "Usage: $(basename $0) [options] amount destination_address [hops [fee [sleeptime_min [sleeptime_max [hop_confirmations]]]]"
+    echo "Usage: $(basename $0) [options] amount destination_address [hops [txfee [sleeptime_min [sleeptime_max [hop_confirmations [txfee_factor]]]]]]"
     echo "Where:"
     echo "  amount              - amount to send in BTC"
     echo "  destination_address - destination address"
     echo "  hops                - number of hops (default: 5)"
-    echo "  fee                 - transaction fee per kW (default: \"estimatesmartfee 2\", currently $($(dirname $0)/estimatesmartfee.sh $bitcoin_cli_options 2) BTC)"
+    echo "  txfee               - average transaction fee per kvB (default: \"estimatesmartfee 2\", currently $($(dirname $0)/estimatesmartfee.sh $bitcoin_cli_options 2) BTC)"
     echo "  sleeptime_min       - minimum sleep time between hops in seconds (default: 10)"
     echo "  sleeptime_max       - maximum sleep time between hops in seconds (default: 15)"
     echo "  hop_confirmations   - minimum number of confirmations between hops (default: 0)"
+    echo "  txfee_factor        - variance around average transaction fee, e.g. 0.00002000 fee, 0.2 var = fee is between 0.00001600 and 0.00002400 (default: 0.3)"
     exit
 fi
 
@@ -32,9 +33,9 @@ if [ "$3" != "" ]; then
     hops=$3
 fi
 if [ "$4" != "" ]; then
-    fee=$4
+    txfee="$4"
 else
-    fee=$($(dirname $0)/estimatesmartfee.sh $bitcoin_cli_options 2)
+    txfee="$($(dirname $0)/estimatesmartfee.sh $bitcoin_cli_options 2)"
 fi
 if [ "$6" != "" ]; then
     sleeptime_min=$5
@@ -48,16 +49,23 @@ if [ "$7" != "" ]; then
 else
     hop_confirmations=0
 fi
+if [ "$8" != "" ]; then
+    txfee_factor="$8"
+else
+    txfee_factor="0.3"
+fi
 
 # Force minimum required fee
-fee="$(echo "$fee" | btc_amount_format)"
+txfee_min="$(bc_float_calc "$txfee * (1 - $txfee_factor)")"
+txfee_max="$(bc_float_calc "$txfee * (1 + $txfee_factor)")"
 mempoolminfee="$(call_bitcoin_cli getmempoolinfo | jq_btc_float ".mempoolminfee")"
-if is_btc_lt "$fee" "$mempoolminfee"; then
-    echo "Fee $fee is below minimum mempool fee, raising to $mempoolminfee"
-    fee="$mempoolminfee"
+if is_btc_lt "$txfee_min" "$mempoolminfee"; then
+    echo "Feerate $txfee_min is below minimum mempool fee, raising minimum to $mempoolminfee"
+    txfee_min="$mempoolminfee"
 fi
+txfee_average="$(bc_float_calc "($txfee_min + $txfee_max) * 0.5")"
 
-echo "Ricocheting $amount BTC to $address via $hops hops using $fee fee per KB"
+echo "Ricocheting $amount BTC to $address via $hops hops using average $txfee_average fee per kvB"
 read -p "Is this ok? " -n 1 -r
 echo
 
@@ -77,18 +85,27 @@ ricochet_addresses+=("$address")
 
 # FixMe: TX size may vary depending on input and output address types
 ricochet_tx_size=192
-single_ricochet_tx_fee=$(bc_float_calc "$ricochet_tx_size * $fee * 0.001")
-ricochet_fees=$(bc_float_calc "($hops - 1) * $single_ricochet_tx_fee")
-send_amount=$(bc_float_calc "$amount + $ricochet_fees")
+ricochet_fees=(
+    "$(randamount "$txfee_min" "$txfee_max")"
+)
+ricochet_fee_sum="0"
+for i in $(seq 1 $(( $hops - 1 ))); do
+    fee="$(randamount "$txfee_min" "$txfee_max")"
+    ricochet_fees+=("$fee")
+    ricochet_fee_sum="$(bc_float_calc "$ricochet_fee_sum + $fee")"
+done
+ricochet_fees+=("0")
+send_amount=$(bc_float_calc "$amount + $ricochet_fee_sum")
 
 #echo "Richochet addresses: ${ricochet_addresses[@]}"
+#echo "Ricochet fees: ${ricochet_fees[@]}"
 
 # Send out first transaction
 echo -n "0: (wallet) -> ${ricochet_addresses[0]} ($send_amount) - "
-call_bitcoin_cli settxfee $fee > /dev/null
-txid=$(call_bitcoin_cli sendtoaddress ${ricochet_addresses[0]} $send_amount)
+call_bitcoin_cli settxfee "${ricochet_fees[0]}" > /dev/null
+txid="$(call_bitcoin_cli sendtoaddress ${ricochet_addresses[0]} $send_amount)"
 echo "$txid"
-rawtx=$(show_tx_by_id $txid)
+rawtx="$(show_tx_by_id $txid)"
 #echo "$rawtx"
 vout_idx=""
 idx=0
@@ -116,10 +133,10 @@ use_txid="$txid"
 echo "Preparing rest of transactions..."
 signedtxes=()
 for i in $(seq 1 $(( $hops - 1 ))); do
-    send_amount=$(bc_float_calc "$send_amount - $single_ricochet_tx_fee")
+    send_amount="$(bc_float_calc "$send_amount - ${ricochet_fees[$i]}")"
     echo -n "$i: ${ricochet_addresses[$(( $i - 1 ))]} -> ${ricochet_addresses[$i]} ($send_amount) - "
-    rawtx=$(call_bitcoin_cli createrawtransaction "[{\"txid\":\"$use_txid\",\"vout\":$vout_idx}]" "{\"${ricochet_addresses[$i]}\":$send_amount}")
-    privkey=$(call_bitcoin_cli dumpprivkey "${ricochet_addresses[$(( $i - 1 ))]}")
+    rawtx="$(call_bitcoin_cli createrawtransaction "[{\"txid\":\"$use_txid\",\"vout\":$vout_idx}]" "{\"${ricochet_addresses[$i]}\":$send_amount}")"
+    privkey="$(call_bitcoin_cli dumpprivkey "${ricochet_addresses[$(( $i - 1 ))]}")"
     signedtx="$(signrawtransactionwithkey "$rawtx" "[\"$privkey\"]" "[{\"txid\":\"$use_txid\",\"vout\":$vout_idx,\"scriptPubKey\":\"$prev_pubkey\",\"amount\":$send_amount}]")"
     decodedtx="$(call_bitcoin_cli decoderawtransaction "$signedtx")"
     use_txid="$(echo "$decodedtx" | jq -r ".txid")"
diff --git a/tests/rand.bats b/tests/rand.bats
new file mode 100755
index 0000000..ae3a098
--- /dev/null
+++ b/tests/rand.bats
@@ -0,0 +1,8 @@
+#!/usr/bin/env bats
+
+. ../inc.common.sh
+
+@test "Randomization" {
+    is_btc_gte "$(randamount "0.1" "0.2")" "0.1"
+    is_btc_lte "$(randamount "0.1" "0.2")" "0.2"
+}