diff --git a/runelite-api/src/main/java/net/runelite/api/Client.java b/runelite-api/src/main/java/net/runelite/api/Client.java
index 4a234ed84a..18f2bb6052 100644
--- a/runelite-api/src/main/java/net/runelite/api/Client.java
+++ b/runelite-api/src/main/java/net/runelite/api/Client.java
@@ -138,6 +138,8 @@ public interface Client extends GameEngine
 
 	HashTable getComponentTable();
 
+	GrandExchangeOffer[] getGrandExchangeOffers();
+
 	boolean isPrayerActive(Prayer prayer);
 
 	int getSkillExperience(Skill skill);
diff --git a/runelite-api/src/main/java/net/runelite/api/GrandExchangeOffer.java b/runelite-api/src/main/java/net/runelite/api/GrandExchangeOffer.java
new file mode 100644
index 0000000000..639908a1fe
--- /dev/null
+++ b/runelite-api/src/main/java/net/runelite/api/GrandExchangeOffer.java
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2017, Adam <Adam@sigterm.info>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.runelite.api;
+
+public interface GrandExchangeOffer
+{
+	int getQuantitySold();
+
+	int getItemId();
+
+	int getTotalQuantity();
+
+	int getPrice();
+
+	int getSpent();
+
+	GrandExchangeOfferState getState();
+}
diff --git a/runelite-api/src/main/java/net/runelite/api/GrandExchangeOfferState.java b/runelite-api/src/main/java/net/runelite/api/GrandExchangeOfferState.java
new file mode 100644
index 0000000000..0c68e493ba
--- /dev/null
+++ b/runelite-api/src/main/java/net/runelite/api/GrandExchangeOfferState.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2017, Adam <Adam@sigterm.info>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package net.runelite.api;
+
+/**
+ * Describes the state of a Grand Exchange offer
+ */
+public enum GrandExchangeOfferState
+{
+	/**
+	 * An empty slot.
+	 */
+	EMPTY,
+	/**
+	 * Any offer that's been cancelled
+	 */
+	CANCELLED,
+	/**
+	 * A buy offer that is currently in progress.
+	 */
+	BUYING,
+	/**
+	 * A buy offer that has completed.
+	 */
+	BOUGHT,
+	/**
+	 * A sell offer that is currently in progress.
+	 */
+	SELLING,
+	/**
+	 * A sell offer that has completed.
+	 */
+	SOLD;
+}
diff --git a/runelite-api/src/main/java/net/runelite/api/events/GrandExchangeOfferChanged.java b/runelite-api/src/main/java/net/runelite/api/events/GrandExchangeOfferChanged.java
new file mode 100644
index 0000000000..72db3b901d
--- /dev/null
+++ b/runelite-api/src/main/java/net/runelite/api/events/GrandExchangeOfferChanged.java
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2017, Adam <Adam@sigterm.info>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.runelite.api.events;
+
+import lombok.Data;
+import net.runelite.api.GrandExchangeOffer;
+
+@Data
+public class GrandExchangeOfferChanged
+{
+	private GrandExchangeOffer offer;
+	private int slot;
+}
diff --git a/runelite-mixins/src/main/java/net/runelite/mixins/RSClientMixin.java b/runelite-mixins/src/main/java/net/runelite/mixins/RSClientMixin.java
index 93d07ca64e..98a2dc5918 100644
--- a/runelite-mixins/src/main/java/net/runelite/mixins/RSClientMixin.java
+++ b/runelite-mixins/src/main/java/net/runelite/mixins/RSClientMixin.java
@@ -29,6 +29,7 @@ import java.util.List;
 import net.runelite.api.ChatMessageType;
 import net.runelite.api.ClanMember;
 import net.runelite.api.GameState;
+import net.runelite.api.GrandExchangeOffer;
 import net.runelite.api.IndexedSprite;
 import net.runelite.api.InventoryID;
 import net.runelite.api.MenuAction;
@@ -44,6 +45,7 @@ import net.runelite.api.Skill;
 import net.runelite.api.Varbits;
 import net.runelite.api.events.ExperienceChanged;
 import net.runelite.api.events.GameStateChanged;
+import net.runelite.api.events.GrandExchangeOfferChanged;
 import net.runelite.api.events.MapRegionChanged;
 import net.runelite.api.events.PlayerMenuOptionsChanged;
 import net.runelite.api.events.ResizeableChanged;
@@ -483,6 +485,28 @@ public abstract class RSClientMixin implements RSClient
 		eventBus.post(gameStateChange);
 	}
 
+	@Inject
+	@FieldHook("grandExchangeOffers")
+	public static void onGrandExchangeOffersChanged(int idx)
+	{
+		if (idx == -1)
+		{
+			return;
+		}
+
+		GrandExchangeOffer internalOffer = client.getGrandExchangeOffers()[idx];
+
+		if (internalOffer == null)
+		{
+			return;
+		}
+
+		GrandExchangeOfferChanged offerChangedEvent = new GrandExchangeOfferChanged();
+		offerChangedEvent.setOffer(internalOffer);
+		offerChangedEvent.setSlot(idx);
+		eventBus.post(offerChangedEvent);
+	}
+
 	@FieldHook("settings")
 	@Inject
 	public static void settingsChanged(int idx)
diff --git a/runelite-mixins/src/main/java/net/runelite/mixins/RSGrandExchangeOfferMixin.java b/runelite-mixins/src/main/java/net/runelite/mixins/RSGrandExchangeOfferMixin.java
new file mode 100644
index 0000000000..f132e84ab4
--- /dev/null
+++ b/runelite-mixins/src/main/java/net/runelite/mixins/RSGrandExchangeOfferMixin.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2018, SomeoneWithAnInternetConnection
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package net.runelite.mixins;
+
+import net.runelite.api.GrandExchangeOfferState;
+import static net.runelite.api.GrandExchangeOfferState.BOUGHT;
+import static net.runelite.api.GrandExchangeOfferState.BUYING;
+import static net.runelite.api.GrandExchangeOfferState.CANCELLED;
+import static net.runelite.api.GrandExchangeOfferState.EMPTY;
+import static net.runelite.api.GrandExchangeOfferState.SELLING;
+import static net.runelite.api.GrandExchangeOfferState.SOLD;
+import net.runelite.api.mixins.Inject;
+import net.runelite.api.mixins.Mixin;
+import net.runelite.rs.api.RSGrandExchangeOffer;
+
+@Mixin(RSGrandExchangeOffer.class)
+public abstract class RSGrandExchangeOfferMixin implements RSGrandExchangeOffer
+{
+
+	/*
+		 Internally a GrandExchangeOffer's state is represented as 4 flags
+		 packed into the lower half of a byte. They are:
+	*/
+
+	//Set for sell offers, unset for buy offers
+	private static final int IS_SELLING = 1 << 3; // 0b1000
+
+
+	/*
+	Set for offers that have finished, either because they've
+	been filled, or because they were cancelled
+	*/
+	private static final int COMPLETED = 1 << 2; // 0b0100
+
+	/*
+	Set for offers that are actually live
+	NB: Insta-buy/sell offers will be simultaneously LIVE and LOCAL
+	*/
+	private static final int LIVE = 1 << 1; // 0b0010
+
+	//True for just-made, just-cancelled, completely cancelled, and completed offers
+	private static final int LOCAL = 1;
+
+	@Inject
+	@Override
+	public GrandExchangeOfferState getState()
+	{
+		byte code = getRSState();
+		boolean isSelling = (code & IS_SELLING) == IS_SELLING;
+		boolean isFinished = (code & COMPLETED) == COMPLETED;
+
+
+		if (code == 0)
+		{
+			return EMPTY;
+		}
+		else if (isFinished && getQuantitySold() < getTotalQuantity())
+		{
+			return CANCELLED;
+		}
+		else if (isSelling)
+		{
+			if (isFinished)
+			{
+				return SOLD;
+			}
+			else // if isUnfinished
+			{
+				return SELLING;
+			}
+		}
+		else // if isBuying
+		{
+			if (isFinished)
+			{
+				return BOUGHT;
+			}
+			else // if isUnfinished
+			{
+				return BUYING;
+			}
+		}
+	}
+}
diff --git a/runescape-api/src/main/java/net/runelite/rs/api/RSGrandExchangeOffer.java b/runescape-api/src/main/java/net/runelite/rs/api/RSGrandExchangeOffer.java
index eb505f9367..d88e582ef7 100644
--- a/runescape-api/src/main/java/net/runelite/rs/api/RSGrandExchangeOffer.java
+++ b/runescape-api/src/main/java/net/runelite/rs/api/RSGrandExchangeOffer.java
@@ -24,26 +24,33 @@
  */
 package net.runelite.rs.api;
 
+import net.runelite.api.GrandExchangeOffer;
 import net.runelite.mapping.Import;
 
-public interface RSGrandExchangeOffer
+public interface RSGrandExchangeOffer extends GrandExchangeOffer
 {
 	@Import("quantitySold")
+	@Override
 	int getQuantitySold();
 
 	@Import("itemId")
+	@Override
 	int getItemId();
 
 	@Import("totalQuantity")
+	@Override
 	int getTotalQuantity();
 
 	@Import("price")
+	@Override
 	int getPrice();
 
 	@Import("spent")
+	@Override
 	int getSpent();
 
 	@Import("state")
 	byte getRSState();
 
+
 }