faceofcat · Nov 5, 2026 · Nov 5, 2026 · Nov 5, 2026
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -8,6 +8,10 @@ After publishing, the action prepares the next development version and archives
 
 ## Unreleased
 
+- A Market Automaton trades on its own, at the same speed as a hopper. Choose an offer, put the payment in the two slots or let a hopper fill them, and take the result from the bottom. The choice stays when the trade locks, and you can take the payment back out of the window.
+- The furnace arrow sits between the payment and the result. A button on the right side of the window chooses whether the block ignores redstone, runs only while powered, or runs only while unpowered.
+- Each automaton offer shows `[max: uses left]`, or `[locked]` once none remain. That label updates while the window stays open.
+- Similar is the icon beside the redstone button. It also buys other villagers' copies of the selected trade and picks the cheapest one the slots can pay.
 - Simplified Chinese for the block, the creative tab, and the market window.
 
 ## 2.0.0-alpha

diff --git a/...c/src/main/java/net/modcrafters/minecraft/villagermarket/fabric/VillagerMarketFabric.java b/...c/src/main/java/net/modcrafters/minecraft/villagermarket/fabric/VillagerMarketFabric.java
@@ -3,6 +3,7 @@
 import net.modcrafters.minecraft.villagermarket.Constants;
 import net.modcrafters.minecraft.villagermarket.ModContent;
 import net.modcrafters.minecraft.villagermarket.VillagerMarket;
+import net.modcrafters.minecraft.villagermarket.network.AutomatonPayloads;
 import net.modcrafters.minecraft.villagermarket.network.MarketPayloads;
 import net.fabricmc.api.ModInitializer;
 import net.fabricmc.fabric.api.creativetab.v1.FabricCreativeModeTab;
@@ -18,14 +19,33 @@ public void onInitialize() {
         Registry.register(BuiltInRegistries.BLOCK, ModContent.MARKET_ID.identifier(), ModContent.marketBlock());
         Registry.register(BuiltInRegistries.ITEM, ModContent.MARKET_ITEM_ID.identifier(), ModContent.marketItem());
         Registry.register(BuiltInRegistries.MENU, ModContent.MENU_ID.identifier(), ModContent.menu());
+        Registry.register(BuiltInRegistries.BLOCK, ModContent.AUTOMATON_ID.identifier(), ModContent.automatonBlock());
+        Registry.register(BuiltInRegistries.ITEM, ModContent.AUTOMATON_ITEM_ID.identifier(), ModContent.automatonItem());
+        Registry.register(BuiltInRegistries.BLOCK_ENTITY_TYPE, ModContent.AUTOMATON_ID.identifier(), ModContent.automatonType());
+        Registry.register(BuiltInRegistries.MENU, ModContent.AUTOMATON_MENU_ID.identifier(), ModContent.automatonMenu());
         Registry.register(BuiltInRegistries.CREATIVE_MODE_TAB, ModContent.TAB_ID.identifier(),
                 ModContent.titled(FabricCreativeModeTab.builder())
-                        .displayItems((parameters, output) -> output.accept(ModContent.MARKET_ITEM))
+                        .displayItems((parameters, output) -> {
+                            output.accept(ModContent.MARKET_ITEM);
+                            output.accept(ModContent.AUTOMATON_ITEM);
+                        })
                         .build());
         PayloadTypeRegistry.clientboundPlay().register(MarketPayloads.Offers.TYPE, MarketPayloads.Offers.STREAM_CODEC);
         PayloadTypeRegistry.serverboundPlay().register(MarketPayloads.Trade.TYPE, MarketPayloads.Trade.STREAM_CODEC);
+        PayloadTypeRegistry.clientboundPlay().register(AutomatonPayloads.Recipe.TYPE, AutomatonPayloads.Recipe.STREAM_CODEC);
+        PayloadTypeRegistry.serverboundPlay().register(AutomatonPayloads.Select.TYPE, AutomatonPayloads.Select.STREAM_CODEC);
+        PayloadTypeRegistry.clientboundPlay().register(AutomatonPayloads.Mode.TYPE, AutomatonPayloads.Mode.STREAM_CODEC);
+        PayloadTypeRegistry.serverboundPlay().register(AutomatonPayloads.Redstone.TYPE, AutomatonPayloads.Redstone.STREAM_CODEC);
+        PayloadTypeRegistry.clientboundPlay().register(AutomatonPayloads.SimilarState.TYPE, AutomatonPayloads.SimilarState.STREAM_CODEC);
+        PayloadTypeRegistry.serverboundPlay().register(AutomatonPayloads.Similar.TYPE, AutomatonPayloads.Similar.STREAM_CODEC);
         ServerPlayNetworking.registerGlobalReceiver(MarketPayloads.Trade.TYPE,
                 (payload, context) -> context.server().execute(() -> MarketPayloads.handleTrade(context.player(), payload)));
+        ServerPlayNetworking.registerGlobalReceiver(AutomatonPayloads.Select.TYPE,
+                (payload, context) -> context.server().execute(() -> AutomatonPayloads.handleSelect(context.player(), payload)));
+        ServerPlayNetworking.registerGlobalReceiver(AutomatonPayloads.Redstone.TYPE,
+                (payload, context) -> context.server().execute(() -> AutomatonPayloads.handleRedstone(context.player(), payload)));
+        ServerPlayNetworking.registerGlobalReceiver(AutomatonPayloads.Similar.TYPE,
+                (payload, context) -> context.server().execute(() -> AutomatonPayloads.handleSimilar(context.player(), payload)));
         Constants.LOG.info("Villager Market Fabric init");
     }
 }
diff --git a/...va/net/modcrafters/minecraft/villagermarket/fabric/client/VillagerMarketFabricClient.java b/...va/net/modcrafters/minecraft/villagermarket/fabric/client/VillagerMarketFabricClient.java
@@ -1,7 +1,9 @@
 package net.modcrafters.minecraft.villagermarket.fabric.client;
 
 import net.modcrafters.minecraft.villagermarket.ModContent;
+import net.modcrafters.minecraft.villagermarket.client.MarketAutomatonScreen;
 import net.modcrafters.minecraft.villagermarket.client.VillagerMarketScreen;
+import net.modcrafters.minecraft.villagermarket.network.AutomatonPayloads;
 import net.modcrafters.minecraft.villagermarket.network.MarketPayloads;
 import net.fabricmc.api.ClientModInitializer;
 import net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking;
@@ -11,7 +13,17 @@ public class VillagerMarketFabricClient implements ClientModInitializer {
     @Override
     public void onInitializeClient() {
         MenuScreens.register(ModContent.menu(), VillagerMarketScreen::new);
+        MenuScreens.register(ModContent.automatonMenu(), MarketAutomatonScreen::new);
         ClientPlayNetworking.registerGlobalReceiver(MarketPayloads.Offers.TYPE,
-                (payload, context) -> context.client().execute(() -> VillagerMarketScreen.apply(payload)));
+                (payload, context) -> context.client().execute(() -> {
+                    VillagerMarketScreen.apply(payload);
+                    MarketAutomatonScreen.applyOffers(payload);
+                }));
+        ClientPlayNetworking.registerGlobalReceiver(AutomatonPayloads.Recipe.TYPE,
+                (payload, context) -> context.client().execute(() -> MarketAutomatonScreen.apply(payload)));
+        ClientPlayNetworking.registerGlobalReceiver(AutomatonPayloads.Mode.TYPE,
+                (payload, context) -> context.client().execute(() -> MarketAutomatonScreen.applyMode(payload)));
+        ClientPlayNetworking.registerGlobalReceiver(AutomatonPayloads.SimilarState.TYPE,
+                (payload, context) -> context.client().execute(() -> MarketAutomatonScreen.applySimilar(payload)));
     }
 }
diff --git a/.../java/net/modcrafters/minecraft/villagermarket/fabric/gametest/FabricMarketGameTests.java b/.../java/net/modcrafters/minecraft/villagermarket/fabric/gametest/FabricMarketGameTests.java
@@ -29,4 +29,24 @@ public void adjustedPriceIsWhatIsCharged(GameTestHelper helper) {
     public void experienceLandsOnThePlayer(GameTestHelper helper) {
         MarketGameTests.experienceLandsOnThePlayer(helper);
     }
+
+    @GameTest(structure = "minecraft:empty")
+    public void automatonTradesFromItsSlots(GameTestHelper helper) {
+        MarketGameTests.automatonTradesFromItsSlots(helper);
+    }
+
+    @GameTest(structure = "minecraft:empty")
+    public void automatonRejectsADifferentBook(GameTestHelper helper) {
+        MarketGameTests.automatonRejectsADifferentBook(helper);
+    }
+
+    @GameTest(structure = "minecraft:empty")
+    public void automatonStopsWithoutRedstone(GameTestHelper helper) {
+        MarketGameTests.automatonStopsWithoutRedstone(helper);
+    }
+
+    @GameTest(structure = "minecraft:empty")
+    public void automatonBuysTheCheapestSimilar(GameTestHelper helper) {
+        MarketGameTests.automatonBuysTheCheapestSimilar(helper);
+    }
 }
diff --git a/...n/java/net/modcrafters/minecraft/villagermarket/fabric/platform/FabricPlatformHelper.java b/...n/java/net/modcrafters/minecraft/villagermarket/fabric/platform/FabricPlatformHelper.java
@@ -1,12 +1,18 @@
 package net.modcrafters.minecraft.villagermarket.fabric.platform;
 
+import net.modcrafters.minecraft.villagermarket.ModContent;
+import net.modcrafters.minecraft.villagermarket.block.entity.MarketAutomatonBlockEntity;
+import net.modcrafters.minecraft.villagermarket.menu.AutomatonOpening;
+import net.modcrafters.minecraft.villagermarket.menu.MarketAutomatonMenu;
 import net.modcrafters.minecraft.villagermarket.menu.OpeningData;
 import net.modcrafters.minecraft.villagermarket.menu.VillagerMarketMenu;
 import net.modcrafters.minecraft.villagermarket.platform.services.PlatformHelper;
 import net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking;
 import net.fabricmc.fabric.api.menu.v1.ExtendedMenuProvider;
 import net.fabricmc.fabric.api.menu.v1.ExtendedMenuType;
 import net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking;
+//? if <26.1
+/*import net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder;*/
 import net.minecraft.core.BlockPos;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.protocol.common.custom.CustomPacketPayload;
@@ -16,6 +22,8 @@
 import net.minecraft.world.entity.player.Player;
 import net.minecraft.world.inventory.AbstractContainerMenu;
 import net.minecraft.world.inventory.MenuType;
+import net.minecraft.world.level.block.entity.BlockEntityType;
+import java.util.Set;
 
 public class FabricPlatformHelper implements PlatformHelper {
     @Override
@@ -28,6 +36,19 @@ public MenuType<VillagerMarketMenu> marketMenu() {
         return new ExtendedMenuType<>(VillagerMarketMenu::new, OpeningData.STREAM_CODEC);
     }
 
+    @Override
+    public MenuType<MarketAutomatonMenu> automatonMenu() {
+        return new ExtendedMenuType<>(MarketAutomatonMenu::new, AutomatonOpening.STREAM_CODEC);
+    }
+
+    @Override
+    public BlockEntityType<MarketAutomatonBlockEntity> automatonType() {
+        //? if >=26.1 {
+        return new BlockEntityType<>(MarketAutomatonBlockEntity::new, Set.of(ModContent.automatonBlock()));
+        //?} else
+        //return FabricBlockEntityTypeBuilder.create(MarketAutomatonBlockEntity::new, ModContent.automatonBlock()).build();
+    }
+
     @Override
     public void openMarket(ServerPlayer player, BlockPos pos) {
         OpeningData data = VillagerMarketMenu.opening((ServerLevel) player.level(), pos);
@@ -49,6 +70,27 @@ public AbstractContainerMenu createMenu(int containerId, Inventory inventory, Pl
         });
     }
 
+    @Override
+    public void openAutomaton(ServerPlayer player, BlockPos pos) {
+        AutomatonOpening data = MarketAutomatonMenu.opening((ServerLevel) player.level(), pos);
+        player.openMenu(new ExtendedMenuProvider<AutomatonOpening>() {
+            @Override
+            public AutomatonOpening getScreenOpeningData(ServerPlayer player) {
+                return data;
+            }
+
+            @Override
+            public Component getDisplayName() {
+                return Component.translatable("block.villagermarket.market_automaton");
+            }
+
+            @Override
+            public AbstractContainerMenu createMenu(int containerId, Inventory inventory, Player player) {
+                return new MarketAutomatonMenu(containerId, inventory, data);
+            }
+        });
+    }
+
     @Override
     public void sendToPlayer(ServerPlayer player, CustomPacketPayload payload) {
         ServerPlayNetworking.send(player, payload);

diff --git a/...c/main/java/net/modcrafters/minecraft/villagermarket/neoforge/VillagerMarketNeoForge.java b/...c/main/java/net/modcrafters/minecraft/villagermarket/neoforge/VillagerMarketNeoForge.java
@@ -5,6 +5,7 @@
 import net.modcrafters.minecraft.villagermarket.VillagerMarket;
 import net.modcrafters.minecraft.villagermarket.neoforge.client.VillagerMarketNeoForgeClient;
 import net.modcrafters.minecraft.villagermarket.neoforge.gametest.NeoForgeMarketGameTests;
+import net.modcrafters.minecraft.villagermarket.network.AutomatonPayloads;
 import net.modcrafters.minecraft.villagermarket.network.MarketPayloads;
 import net.minecraft.core.registries.Registries;
 import net.minecraft.world.item.CreativeModeTab;
@@ -35,19 +36,48 @@ private static void registerContent(RegisterEvent event) {
         event.register(Registries.BLOCK, ModContent.MARKET_ID.identifier(), ModContent::marketBlock);
         event.register(Registries.ITEM, ModContent.MARKET_ITEM_ID.identifier(), ModContent::marketItem);
         event.register(Registries.MENU, ModContent.MENU_ID.identifier(), ModContent::menu);
+        event.register(Registries.BLOCK, ModContent.AUTOMATON_ID.identifier(), ModContent::automatonBlock);
+        event.register(Registries.ITEM, ModContent.AUTOMATON_ITEM_ID.identifier(), ModContent::automatonItem);
+        event.register(Registries.BLOCK_ENTITY_TYPE, ModContent.AUTOMATON_ID.identifier(), ModContent::automatonType);
+        event.register(Registries.MENU, ModContent.AUTOMATON_MENU_ID.identifier(), ModContent::automatonMenu);
         event.register(Registries.CREATIVE_MODE_TAB, ModContent.TAB_ID.identifier(), () ->
                 ModContent.titled(CreativeModeTab.builder())
-                        .displayItems((parameters, output) -> output.accept(ModContent.MARKET_ITEM))
+                        .displayItems((parameters, output) -> {
+                            output.accept(ModContent.MARKET_ITEM);
+                            output.accept(ModContent.AUTOMATON_ITEM);
+                        })
                         .build());
     }
 
     private static void registerPayloads(RegisterPayloadHandlersEvent event) {
         PayloadRegistrar registrar = event.registrar("1");
         //? if >=1.21.6 {
         registrar.playToClient(MarketPayloads.Offers.TYPE, MarketPayloads.Offers.STREAM_CODEC);
-        //?} else
-        //registrar.playToClient(MarketPayloads.Offers.TYPE, MarketPayloads.Offers.STREAM_CODEC, (payload, context) -> net.modcrafters.minecraft.villagermarket.client.VillagerMarketScreen.apply(payload));
+        //?} else {
+        /*registrar.playToClient(MarketPayloads.Offers.TYPE, MarketPayloads.Offers.STREAM_CODEC, (payload, context) -> {
+            net.modcrafters.minecraft.villagermarket.client.VillagerMarketScreen.apply(payload);
+            net.modcrafters.minecraft.villagermarket.client.MarketAutomatonScreen.applyOffers(payload);
+        });
+        *///?}
         registrar.playToServer(MarketPayloads.Trade.TYPE, MarketPayloads.Trade.STREAM_CODEC,
                 (payload, context) -> context.enqueueWork(() -> MarketPayloads.handleTrade((net.minecraft.server.level.ServerPlayer) context.player(), payload)));
+        //? if >=1.21.6 {
+        registrar.playToClient(AutomatonPayloads.Recipe.TYPE, AutomatonPayloads.Recipe.STREAM_CODEC);
+        //?} else
+        //registrar.playToClient(AutomatonPayloads.Recipe.TYPE, AutomatonPayloads.Recipe.STREAM_CODEC, (payload, context) -> net.modcrafters.minecraft.villagermarket.client.MarketAutomatonScreen.apply(payload));
+        registrar.playToServer(AutomatonPayloads.Select.TYPE, AutomatonPayloads.Select.STREAM_CODEC,
+                (payload, context) -> context.enqueueWork(() -> AutomatonPayloads.handleSelect((net.minecraft.server.level.ServerPlayer) context.player(), payload)));
+        //? if >=1.21.6 {
+        registrar.playToClient(AutomatonPayloads.Mode.TYPE, AutomatonPayloads.Mode.STREAM_CODEC);
+        //?} else
+        //registrar.playToClient(AutomatonPayloads.Mode.TYPE, AutomatonPayloads.Mode.STREAM_CODEC, (payload, context) -> net.modcrafters.minecraft.villagermarket.client.MarketAutomatonScreen.applyMode(payload));
+        registrar.playToServer(AutomatonPayloads.Redstone.TYPE, AutomatonPayloads.Redstone.STREAM_CODEC,
+                (payload, context) -> context.enqueueWork(() -> AutomatonPayloads.handleRedstone((net.minecraft.server.level.ServerPlayer) context.player(), payload)));
+        //? if >=1.21.6 {
+        registrar.playToClient(AutomatonPayloads.SimilarState.TYPE, AutomatonPayloads.SimilarState.STREAM_CODEC);
+        //?} else
+        //registrar.playToClient(AutomatonPayloads.SimilarState.TYPE, AutomatonPayloads.SimilarState.STREAM_CODEC, (payload, context) -> net.modcrafters.minecraft.villagermarket.client.MarketAutomatonScreen.applySimilar(payload));
+        registrar.playToServer(AutomatonPayloads.Similar.TYPE, AutomatonPayloads.Similar.STREAM_CODEC,
+                (payload, context) -> context.enqueueWork(() -> AutomatonPayloads.handleSimilar((net.minecraft.server.level.ServerPlayer) context.player(), payload)));
     }
 }
diff --git a/...et/modcrafters/minecraft/villagermarket/neoforge/client/VillagerMarketNeoForgeClient.java b/...et/modcrafters/minecraft/villagermarket/neoforge/client/VillagerMarketNeoForgeClient.java
@@ -1,7 +1,9 @@
 package net.modcrafters.minecraft.villagermarket.neoforge.client;
 
 import net.modcrafters.minecraft.villagermarket.ModContent;
+import net.modcrafters.minecraft.villagermarket.client.MarketAutomatonScreen;
 import net.modcrafters.minecraft.villagermarket.client.VillagerMarketScreen;
+import net.modcrafters.minecraft.villagermarket.network.AutomatonPayloads;
 import net.modcrafters.minecraft.villagermarket.network.MarketPayloads;
 import net.neoforged.bus.api.IEventBus;
 import net.neoforged.neoforge.client.event.RegisterMenuScreensEvent;
@@ -20,11 +22,18 @@ public static void register(IEventBus modBus) {
 
     private static void registerScreens(RegisterMenuScreensEvent event) {
         event.register(ModContent.menu(), VillagerMarketScreen::new);
+        event.register(ModContent.automatonMenu(), MarketAutomatonScreen::new);
     }
 
     //? if >=1.21.6 {
     private static void registerPayloads(RegisterClientPayloadHandlersEvent event) {
-        event.register(MarketPayloads.Offers.TYPE, (payload, context) -> VillagerMarketScreen.apply(payload));
+        event.register(MarketPayloads.Offers.TYPE, (payload, context) -> {
+            VillagerMarketScreen.apply(payload);
+            MarketAutomatonScreen.applyOffers(payload);
+        });
+        event.register(AutomatonPayloads.Recipe.TYPE, (payload, context) -> MarketAutomatonScreen.apply(payload));
+        event.register(AutomatonPayloads.Mode.TYPE, (payload, context) -> MarketAutomatonScreen.applyMode(payload));
+        event.register(AutomatonPayloads.SimilarState.TYPE, (payload, context) -> MarketAutomatonScreen.applySimilar(payload));
     }
     //?}
 }