diff --git a/ArchiSteamFarm.OfficialPlugins.ItemsMatcher/RemoteCommunication.cs b/ArchiSteamFarm.OfficialPlugins.ItemsMatcher/RemoteCommunication.cs
index 537ed5285e3c2..aabf197f93549 100644
--- a/ArchiSteamFarm.OfficialPlugins.ItemsMatcher/RemoteCommunication.cs
+++ b/ArchiSteamFarm.OfficialPlugins.ItemsMatcher/RemoteCommunication.cs
@@ -1439,7 +1439,7 @@ private async Task<bool> MatchActively(ImmutableHashSet<ListedUser> listedUsers,
 
 				Bot.ArchiLogger.LogGenericTrace($"{Bot.SteamID} <- {string.Join(", ", itemsToReceive.Select(static item => $"{item.RealAppID}/{item.Type}/{item.Rarity}/{item.ClassID} #{item.Amount}"))} | {string.Join(", ", itemsToGive.Select(static item => $"{item.RealAppID}/{item.Type}/{item.Rarity}/{item.ClassID} #{item.Amount}"))} -> {listedUser.SteamID}");
 
-				(bool success, HashSet<ulong>? tradeOfferIDs, HashSet<ulong>? mobileTradeOfferIDs) = await Bot.ArchiWebHandler.SendTradeOffer(listedUser.SteamID, itemsToGive, itemsToReceive, listedUser.TradeToken, true).ConfigureAwait(false);
+				(bool success, HashSet<ulong>? tradeOfferIDs, HashSet<ulong>? mobileTradeOfferIDs) = await Bot.ArchiWebHandler.SendTradeOffer(listedUser.SteamID, itemsToGive, itemsToReceive, listedUser.TradeToken, nameof(MatchActively), true).ConfigureAwait(false);
 
 				if (tradeOfferIDs?.Count > 0) {
 					matchActivelyTradeOfferIDs.UnionWith(tradeOfferIDs);
diff --git a/ArchiSteamFarm/Steam/Integration/ArchiWebHandler.cs b/ArchiSteamFarm/Steam/Integration/ArchiWebHandler.cs
index ec0f1de0ae1ce..c78aedbd8a2f7 100644
--- a/ArchiSteamFarm/Steam/Integration/ArchiWebHandler.cs
+++ b/ArchiSteamFarm/Steam/Integration/ArchiWebHandler.cs
@@ -56,6 +56,7 @@ public sealed class ArchiWebHandler : IDisposable {
 
 	private const string EconService = "IEconService";
 	private const string LoyaltyRewardsService = "ILoyaltyRewardsService";
+	private const byte MaxTradeOfferMessageLength = 128;
 	private const byte MinimumSessionValidityInSeconds = 10;
 	private const byte SessionIDLength = 24; // For maximum compatibility, should be divisible by 2 and match the length of "sessionid" property that Steam uses across their websites
 	private const string SteamAppsService = "ISteamApps";
@@ -576,7 +577,7 @@ public async Task<bool> JoinGroup(ulong groupID) {
 	}
 
 	[PublicAPI]
-	public async Task<(bool Success, HashSet<ulong>? TradeOfferIDs, HashSet<ulong>? MobileTradeOfferIDs)> SendTradeOffer(ulong steamID, IReadOnlyCollection<Asset>? itemsToGive = null, IReadOnlyCollection<Asset>? itemsToReceive = null, string? token = null, bool forcedSingleOffer = false, ushort itemsPerTrade = Trading.MaxItemsPerTrade) {
+	public async Task<(bool Success, HashSet<ulong>? TradeOfferIDs, HashSet<ulong>? MobileTradeOfferIDs)> SendTradeOffer(ulong steamID, IReadOnlyCollection<Asset>? itemsToGive = null, IReadOnlyCollection<Asset>? itemsToReceive = null, string? token = null, string? customMessage = null, bool forcedSingleOffer = false, ushort itemsPerTrade = Trading.MaxItemsPerTrade) {
 		if ((steamID == 0) || !new SteamID(steamID).IsIndividualAccount) {
 			throw new ArgumentOutOfRangeException(nameof(steamID));
 		}
@@ -620,6 +621,14 @@ public async Task<bool> JoinGroup(ulong groupID) {
 			}
 		}
 
+		string tradeOfferMessage = $"Sent by {SharedInfo.PublicIdentifier}/{SharedInfo.Version}";
+
+		if (!string.IsNullOrEmpty(customMessage)) {
+			byte allowedExtraMessageLength = (byte) (MaxTradeOfferMessageLength - tradeOfferMessage.Length - 3); // We're going to add a space, opening and closing bracket
+
+			tradeOfferMessage += $" ({(customMessage.Length <= allowedExtraMessageLength ? customMessage : $"{customMessage[..(allowedExtraMessageLength - 1)]}{SteamChatMessage.ContinuationCharacter}")})";
+		}
+
 		Uri request = new(SteamCommunityURL, "/tradeoffer/new/send");
 		Uri referer = new(SteamCommunityURL, "/tradeoffer/new");
 
@@ -628,7 +637,7 @@ public async Task<bool> JoinGroup(ulong groupID) {
 			{ "partner", steamID.ToString(CultureInfo.InvariantCulture) },
 			{ "serverid", "1" },
 			{ "trade_offer_create_params", !string.IsNullOrEmpty(token) ? new JsonObject { { "trade_offer_access_token", token } }.ToJsonText() : "" },
-			{ "tradeoffermessage", $"Sent by {SharedInfo.PublicIdentifier}/{SharedInfo.Version}" }
+			{ "tradeoffermessage", tradeOfferMessage }
 		};
 
 		HashSet<ulong> tradeOfferIDs = new(trades.Count);
diff --git a/ArchiSteamFarm/Steam/Interaction/Actions.cs b/ArchiSteamFarm/Steam/Interaction/Actions.cs
index b6c65a063fc0f..419e4d794bba8 100644
--- a/ArchiSteamFarm/Steam/Interaction/Actions.cs
+++ b/ArchiSteamFarm/Steam/Interaction/Actions.cs
@@ -342,7 +342,7 @@ static async () => {
 	}
 
 	[PublicAPI]
-	public async Task<(bool Success, string Message)> SendInventory(IReadOnlyCollection<Asset> items, ulong targetSteamID = 0, string? tradeToken = null, ushort itemsPerTrade = Trading.MaxItemsPerTrade) {
+	public async Task<(bool Success, string Message)> SendInventory(IReadOnlyCollection<Asset> items, ulong targetSteamID = 0, string? tradeToken = null, string? customMessage = null, ushort itemsPerTrade = Trading.MaxItemsPerTrade) {
 		if ((items == null) || (items.Count == 0)) {
 			throw new ArgumentNullException(nameof(items));
 		}
@@ -386,7 +386,7 @@ static async () => {
 			return (false, Strings.BotLootingFailed);
 		}
 
-		(bool success, _, HashSet<ulong>? mobileTradeOfferIDs) = await Bot.ArchiWebHandler.SendTradeOffer(targetSteamID, items, token: tradeToken, itemsPerTrade: itemsPerTrade).ConfigureAwait(false);
+		(bool success, _, HashSet<ulong>? mobileTradeOfferIDs) = await Bot.ArchiWebHandler.SendTradeOffer(targetSteamID, items, token: tradeToken, customMessage: customMessage, itemsPerTrade: itemsPerTrade).ConfigureAwait(false);
 
 		if ((mobileTradeOfferIDs?.Count > 0) && Bot.HasMobileAuthenticator) {
 			(bool twoFactorSuccess, _, _) = await HandleTwoFactorAuthenticationConfirmations(true, Confirmation.EConfirmationType.Trade, mobileTradeOfferIDs, true).ConfigureAwait(false);
@@ -400,7 +400,7 @@ static async () => {
 	}
 
 	[PublicAPI]
-	public async Task<(bool Success, string Message)> SendInventory(uint appID = Asset.SteamAppID, ulong contextID = Asset.SteamCommunityContextID, ulong targetSteamID = 0, string? tradeToken = null, Func<Asset, bool>? filterFunction = null, ushort itemsPerTrade = Trading.MaxItemsPerTrade) {
+	public async Task<(bool Success, string Message)> SendInventory(uint appID = Asset.SteamAppID, ulong contextID = Asset.SteamCommunityContextID, ulong targetSteamID = 0, string? tradeToken = null, string? customMessage = null, Func<Asset, bool>? filterFunction = null, ushort itemsPerTrade = Trading.MaxItemsPerTrade) {
 		ArgumentOutOfRangeException.ThrowIfZero(appID);
 		ArgumentOutOfRangeException.ThrowIfZero(contextID);
 
@@ -444,7 +444,7 @@ static async () => {
 			return (false, string.Format(CultureInfo.CurrentCulture, Strings.ErrorIsEmpty, nameof(inventory)));
 		}
 
-		return await SendInventory(inventory, targetSteamID, tradeToken, itemsPerTrade).ConfigureAwait(false);
+		return await SendInventory(inventory, targetSteamID, tradeToken, customMessage, itemsPerTrade).ConfigureAwait(false);
 	}
 
 	[PublicAPI]