Deposit improvements

common/src/main/java/bisq/common/util/MathUtils.java

@@ -22,6 +22,10 @@
 import java.math.BigDecimal;
 import java.math.RoundingMode;
 
+import java.util.ArrayDeque;
+import java.util.Deque;
+import java.util.Optional;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -107,4 +111,60 @@ public static long getMedian(Long[] list) {
         }
         return median;
     }
+
+    public static class MovingAverage {
+        Deque<Long> window;
+        private int size;
+        private long sum;
+        private double outlier;
+
+        // Outlier as ratio
+        public MovingAverage(int size, double outlier) {
+            this.size = size;
+            window = new ArrayDeque<>(size);
+            this.outlier = outlier;
+            sum = 0;
+        }
+
+        public Optional<Double> next(long val) {
+            var fullAtStart = isFull();
+            if (fullAtStart) {
+                if (outlier > 0) {
+                    // Return early if it's an outlier
+                    var avg = (double) sum / size;
+                    if (Math.abs(avg - val) / avg > outlier) {
+                        return Optional.empty();
+                    }
+                }
+                sum -= window.remove();
+            }
+            window.add(val);
+            sum += val;
+            if (!fullAtStart && isFull() && outlier != 0) {
+                removeInitialOutlier();
+            }
+            // When discarding outliers, the first n non discarded elements return Optional.empty()
+            return outlier > 0 && !isFull() ? Optional.empty() : current();
+        }
+
+        boolean isFull() {
+            return window.size() == size;
+        }
+
+        private void removeInitialOutlier() {
+            var element = window.iterator();
+            while (element.hasNext()) {
+                var val = element.next();
+                var avgExVal = (double) (sum - val) / (size - 1);
+                if (Math.abs(avgExVal - val) / avgExVal > outlier) {
+                    element.remove();
+                    break;
+                }
+            }
+        }
+
+        public Optional<Double> current() {
+            return window.size() == 0 ? Optional.empty() : Optional.of((double) sum / window.size());
+        }
+    }
 }

common/src/test/java/bisq/common/util/MathUtilsTest.java

@@ -0,0 +1,57 @@
+/*
+ * This file is part of Bisq.
+ *
+ * Bisq is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * Bisq is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Bisq. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package bisq.common.util;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+
+public class MathUtilsTest {
+
+
+    @SuppressWarnings("OptionalGetWithoutIsPresent")
+    @Test
+    public void testMovingAverageWithoutOutlierExclusion() {
+        var values = new int[]{4, 5, 3, 1, 2, 4};
+        // Moving average = 4, 4.5, 4, 3, 2, 7/3
+        var movingAverage = new MathUtils.MovingAverage(3, 0);
+        int i = 0;
+        assertEquals(4, movingAverage.next(values[i++]).get(),0.001);
+        assertEquals(4.5, movingAverage.next(values[i++]).get(),0.001);
+        assertEquals(4, movingAverage.next(values[i++]).get(),0.001);
+        assertEquals(3, movingAverage.next(values[i++]).get(),0.001);
+        assertEquals(2, movingAverage.next(values[i++]).get(),0.001);
+        assertEquals((double) 7 / 3, movingAverage.next(values[i]).get(),0.001);
+    }
+
+    @SuppressWarnings("OptionalGetWithoutIsPresent")
+    @Test
+    public void testMovingAverageWithOutlierExclusion() {
+        var values = new int[]{100, 102, 95, 101, 120, 115};
+        // Moving average = N/A, N/A, 99, 99.333..., N/A, 103.666...
+        var movingAverage = new MathUtils.MovingAverage(3, 0.2);
+        int i = 0;
+        assertFalse(movingAverage.next(values[i++]).isPresent());
+        assertFalse(movingAverage.next(values[i++]).isPresent());
+        assertEquals(99, movingAverage.next(values[i++]).get(),0.001);
+        assertEquals(99.333, movingAverage.next(values[i++]).get(),0.001);
+        assertFalse(movingAverage.next(values[i++]).isPresent());
+        assertEquals(103.666, movingAverage.next(values[i]).get(),0.001);
+    }
+}

core/src/main/java/bisq/core/btc/wallet/Restrictions.java

@@ -90,4 +90,9 @@ public static Coin getMinRefundAtMediatedDispute() {
             MIN_REFUND_AT_MEDIATED_DISPUTE = Coin.parseCoin("0.003"); // 0.003 BTC about 21 USD @ 7000 USD/BTC
         return MIN_REFUND_AT_MEDIATED_DISPUTE;
     }
+
+    public static int getLockTime(boolean isAsset) {
+        // 10 days for altcoins, 20 days for other payment methods
+        return isAsset ? 144 * 10 : 144 * 20;
+    }
 }

core/src/main/java/bisq/core/offer/CreateOfferService.java

@@ -181,7 +181,7 @@ public Offer createAndGetOffer(String offerId,
         List<String> acceptedCountryCodes = PaymentAccountUtil.getAcceptedCountryCodes(paymentAccount);
         String bankId = PaymentAccountUtil.getBankId(paymentAccount);
         List<String> acceptedBanks = PaymentAccountUtil.getAcceptedBanks(paymentAccount);
-        double sellerSecurityDeposit = getSellerSecurityDepositAsDouble();
+        double sellerSecurityDeposit = getSellerSecurityDepositAsDouble(buyerSecurityDepositAsDouble);
         Coin txFeeFromFeeService = getEstimatedFeeAndTxSize(amount, direction, buyerSecurityDepositAsDouble, sellerSecurityDeposit).first;
         Coin makerFeeAsCoin = getMakerFee(amount);
         boolean isCurrencyForMakerFeeBtc = OfferUtil.isCurrencyForMakerFeeBtc(preferences, bsqWalletService, amount);
@@ -285,8 +285,9 @@ public Coin getSecurityDeposit(OfferPayload.Direction direction,
                 getSellerSecurityDeposit(amount, sellerSecurityDeposit);
     }
 
-    public double getSellerSecurityDepositAsDouble() {
-        return Restrictions.getSellerSecurityDepositAsPercent();
+    public double getSellerSecurityDepositAsDouble(double buyerSecurityDeposit) {
+        return Preferences.USE_SYMMETRIC_SECURITY_DEPOSIT ? buyerSecurityDeposit :
+                Restrictions.getSellerSecurityDepositAsPercent();
     }
 
     public Coin getMakerFee(Coin amount) {

core/src/main/java/bisq/core/offer/OpenOfferManager.java

@@ -22,8 +22,8 @@
 import bisq.core.btc.wallet.TradeWalletService;
 import bisq.core.dao.DaoFacade;
 import bisq.core.exceptions.TradePriceOutOfToleranceException;
-import bisq.core.locale.Res;
 import bisq.core.filter.FilterManager;
+import bisq.core.locale.Res;
 import bisq.core.offer.availability.DisputeAgentSelection;
 import bisq.core.offer.messages.OfferAvailabilityRequest;
 import bisq.core.offer.messages.OfferAvailabilityResponse;
@@ -353,7 +353,7 @@ public void placeOffer(Offer offer,
         Coin reservedFundsForOffer = createOfferService.getReservedFundsForOffer(offer.getDirection(),
                 offer.getAmount(),
                 buyerSecurityDeposit,
-                createOfferService.getSellerSecurityDepositAsDouble());
+                createOfferService.getSellerSecurityDepositAsDouble(buyerSecurityDeposit));
 
         PlaceOfferModel model = new PlaceOfferModel(offer,
                 reservedFundsForOffer,

core/src/main/java/bisq/core/trade/protocol/tasks/maker/MakerSetsLockTime.java

@@ -17,6 +17,7 @@
 
 package bisq.core.trade.protocol.tasks.maker;
 
+import bisq.core.btc.wallet.Restrictions;
 import bisq.core.trade.Trade;
 import bisq.core.trade.protocol.tasks.TradeTask;
 
@@ -38,7 +39,7 @@ protected void run() {
             runInterceptHook();
 
             // 10 days for altcoins, 20 days for other payment methods
-            int delay = processModel.getOffer().getPaymentMethod().isAsset() ? 144 * 10 : 144 * 20;
+            int delay = Restrictions.getLockTime(processModel.getOffer().getPaymentMethod().isAsset());
             if (Config.baseCurrencyNetwork().isRegtest()) {
                 delay = 5;
             }

core/src/main/java/bisq/core/user/Preferences.java

@@ -118,6 +118,9 @@ public final class Preferences implements PersistedDataHost, BridgeAddressProvid
             new BlockChainExplorer("bsq.bisq.cc (@m52go)", "https://bsq.bisq.cc/tx.html?tx=", "https://bsq.bisq.cc/Address.html?addr=")
     ));
 
+    public static final boolean USE_SYMMETRIC_SECURITY_DEPOSIT = true;
+
+
     // payload is initialized so the default values are available for Property initialization.
     @Setter
     @Delegate(excludes = ExcludesDelegateMethods.class)

core/src/main/java/bisq/core/util/FormattingUtils.java

@@ -211,6 +211,10 @@ public static String formatToPercentWithSymbol(double value) {
         return formatToPercent(value) + "%";
     }
 
+    public static String formatToRoundedPercentWithSymbol(double value) {
+        return formatToPercent(value, new DecimalFormat("#")) + "%";
+    }
+
     public static String formatPercentagePrice(double value) {
         return formatToPercentWithSymbol(value);
     }
@@ -219,6 +223,11 @@ public static String formatToPercent(double value) {
         DecimalFormat decimalFormat = new DecimalFormat("#.##");
         decimalFormat.setMinimumFractionDigits(2);
         decimalFormat.setMaximumFractionDigits(2);
+
+        return formatToPercent(value, decimalFormat);
+    }
+
+    public static String formatToPercent(double value, DecimalFormat decimalFormat) {
         return decimalFormat.format(MathUtils.roundDouble(value * 100.0, 2)).replace(",", ".");
     }
 

core/src/main/resources/i18n/displayStrings.properties

@@ -357,6 +357,8 @@ shared.notSigned.noNeed=This account type doesn't use signing
 
 offerbook.nrOffers=No. of offers: {0}
 offerbook.volume={0} (min - max)
+offerbook.deposit=Deposit BTC (%)
+offerbook.deposit.help=Deposit paid by each trader to guarantee the trade. Will be returned when the trade is completed.
 
 offerbook.createOfferToBuy=Create new offer to buy {0}
 offerbook.createOfferToSell=Create new offer to sell {0}
@@ -480,6 +482,7 @@ createOffer.tac=With publishing this offer I agree to trade with any trader who
 createOffer.currencyForFee=Trade fee
 createOffer.setDeposit=Set buyer's security deposit (%)
 createOffer.setDepositAsBuyer=Set my security deposit as buyer (%)
+createOffer.setDepositForBothTraders=Set both traders' security deposit (%)
 createOffer.securityDepositInfo=Your buyer''s security deposit will be {0}
 createOffer.securityDepositInfoAsBuyer=Your security deposit as buyer will be {0}
 createOffer.minSecurityDepositUsed=Min. buyer security deposit is used

desktop/src/main/java/bisq/desktop/main/offer/MutableOfferDataModel.java

@@ -43,6 +43,8 @@
 import bisq.core.provider.fee.FeeService;
 import bisq.core.provider.price.PriceFeedService;
 import bisq.core.trade.handlers.TransactionResultHandler;
+import bisq.core.trade.statistics.TradeStatistics2;
+import bisq.core.trade.statistics.TradeStatisticsManager;
 import bisq.core.user.Preferences;
 import bisq.core.user.User;
 import bisq.core.util.FormattingUtils;
@@ -79,8 +81,11 @@
 import javafx.collections.ObservableList;
 import javafx.collections.SetChangeListener;
 
+import java.util.Comparator;
+import java.util.Date;
 import java.util.HashSet;
 import java.util.Optional;
+import java.util.stream.Collectors;
 
 import javax.annotation.Nullable;
 
@@ -126,6 +131,7 @@ public abstract class MutableOfferDataModel extends OfferDataModel implements Bs
     private boolean marketPriceAvailable;
     private int feeTxSize = TxFeeEstimationService.TYPICAL_TX_WITH_1_INPUT_SIZE;
     protected boolean allowAmountUpdate = true;
+    private final TradeStatisticsManager tradeStatisticsManager;
 
 
     ///////////////////////////////////////////////////////////////////////////////////////////
@@ -145,6 +151,7 @@ public MutableOfferDataModel(CreateOfferService createOfferService,
                                  FeeService feeService,
                                  @Named(FormattingUtils.BTC_FORMATTER_KEY) CoinFormatter btcFormatter,
                                  MakerFeeProvider makerFeeProvider,
+                                 TradeStatisticsManager tradeStatisticsManager,
                                  Navigation navigation) {
         super(btcWalletService);
 
@@ -160,6 +167,7 @@ public MutableOfferDataModel(CreateOfferService createOfferService,
         this.btcFormatter = btcFormatter;
         this.makerFeeProvider = makerFeeProvider;
         this.navigation = navigation;
+        this.tradeStatisticsManager = tradeStatisticsManager;
 
         offerId = createOfferService.getRandomOfferId();
         shortOfferId = Utilities.getShortId(offerId);
@@ -257,6 +265,7 @@ public boolean initWithData(OfferPayload.Direction direction, TradeCurrency trad
         calculateVolume();
         calculateTotalToPay();
         updateBalance();
+        setSuggestedSecurityDeposit(getPaymentAccount());
 
         return true;
     }
@@ -293,7 +302,7 @@ public void updateEstimatedFeeAndTxSize() {
         Tuple2<Coin, Integer> estimatedFeeAndTxSize = createOfferService.getEstimatedFeeAndTxSize(amount.get(),
                 direction,
                 buyerSecurityDeposit.get(),
-                createOfferService.getSellerSecurityDepositAsDouble());
+                createOfferService.getSellerSecurityDepositAsDouble(buyerSecurityDeposit.get()));
         txFeeFromFeeService = estimatedFeeAndTxSize.first;
         feeTxSize = estimatedFeeAndTxSize.second;
     }
@@ -316,14 +325,49 @@ void onPaymentAccountSelected(PaymentAccount paymentAccount) {
             this.paymentAccount = paymentAccount;
 
             setTradeCurrencyFromPaymentAccount(paymentAccount);
-
-            buyerSecurityDeposit.set(preferences.getBuyerSecurityDepositAsPercent(getPaymentAccount()));
+            setSuggestedSecurityDeposit(getPaymentAccount());
 
             if (amount.get() != null)
                 this.amount.set(Coin.valueOf(Math.min(amount.get().value, getMaxTradeLimit())));
         }
     }
 
+    private void setSuggestedSecurityDeposit(PaymentAccount paymentAccount) {
+        var minSecurityDeposit = preferences.getBuyerSecurityDepositAsPercent(getPaymentAccount());
+        if (getTradeCurrency() == null) {
+            setBuyerSecurityDeposit(minSecurityDeposit, false);
+            return;
+        }
+        // Get average historic prices over for the prior trade period equaling the lock time
+        var blocksRange = Restrictions.getLockTime(paymentAccount.getPaymentMethod().isAsset());
+        var startDate = new Date(System.currentTimeMillis() - blocksRange * 10 * 60000);
+        var sortedRangeData = tradeStatisticsManager.getObservableTradeStatisticsSet().stream()
+                .filter(e -> e.getCurrencyCode().equals(getTradeCurrency().getCode()))
+                .filter(e -> e.getTradeDate().compareTo(startDate) >= 0)
+                .sorted(Comparator.comparing(TradeStatistics2::getTradeDate))
+                .collect(Collectors.toList());
+        var movingAverage = new MathUtils.MovingAverage(10, 0.2);
+        double[] extremes = {Double.MAX_VALUE, Double.MIN_VALUE};
+        sortedRangeData.forEach(e -> {
+            var price = e.getTradePrice().getValue();
+            movingAverage.next(price).ifPresent(val -> {
+                if (val < extremes[0]) extremes[0] = val;
+                if (val > extremes[1]) extremes[1] = val;
+            });
+        });
+        var min = extremes[0];
+        var max = extremes[1];
+        if (min == 0d || max == 0d) {
+            setBuyerSecurityDeposit(minSecurityDeposit, false);
+            return;
+        }
+        // Suggested deposit is double the trade range over the previous lock time period, bounded by min/max deposit
+        var suggestedSecurityDeposit =
+                Math.min(2 * (max - min) / max, Restrictions.getMaxBuyerSecurityDepositAsPercent());
+        buyerSecurityDeposit.set(Math.max(suggestedSecurityDeposit, minSecurityDeposit));
+    }
+
+
     private void setTradeCurrencyFromPaymentAccount(PaymentAccount paymentAccount) {
         if (!paymentAccount.getTradeCurrencies().contains(tradeCurrency)) {
             if (paymentAccount.getSelectedTradeCurrency() != null)
@@ -590,9 +634,12 @@ protected void setVolume(Volume volume) {
         this.volume.set(volume);
     }
 
-    void setBuyerSecurityDeposit(double value) {
+    void setBuyerSecurityDeposit(double value, boolean persist) {
         this.buyerSecurityDeposit.set(value);
-        preferences.setBuyerSecurityDepositAsPercent(value, getPaymentAccount());
+        if (persist) {
+            // Only expected to persist for manually changed deposit values
+            preferences.setBuyerSecurityDepositAsPercent(value, getPaymentAccount());
+        }
     }
 
     protected boolean isUseMarketBasedPriceValue() {
@@ -649,7 +696,8 @@ private Coin getSellerSecurityDepositAsCoin() {
         if (amountAsCoin == null)
             amountAsCoin = Coin.ZERO;
 
-        Coin percentOfAmountAsCoin = CoinUtil.getPercentOfAmountAsCoin(createOfferService.getSellerSecurityDepositAsDouble(), amountAsCoin);
+        Coin percentOfAmountAsCoin = CoinUtil.getPercentOfAmountAsCoin(
+                createOfferService.getSellerSecurityDepositAsDouble(buyerSecurityDeposit.get()), amountAsCoin);
         return getBoundedSellerSecurityDepositAsCoin(percentOfAmountAsCoin);
     }