diff --git a/contracts/coretime-market/Cargo.toml b/contracts/coretime-market/Cargo.toml
index 3b31a3c..4518d36 100755
--- a/contracts/coretime-market/Cargo.toml
+++ b/contracts/coretime-market/Cargo.toml
@@ -14,16 +14,19 @@ scale-info = { version = "2.6", default-features = false, features = ["derive"],
 # OpenBrush dependency
 openbrush = { git = "https://github.com/Brushfam/openbrush-contracts", branch = "develop", default-features = false, features=["psp34"] }
 
+primitives = { path = "../../primitives", default-features = false  }
+
 [dev-dependencies]
 ink_e2e = "4.2.1"
 
 [lib]
-path = "lib.rs"
+path = "src/lib.rs"
 
 [features]
 default = ["std"]
 std = [
     "ink/std",
+    "primitives/std",
     "scale/std",
     "scale-info/std",
     "openbrush/std",
diff --git a/contracts/coretime-market/src/lib.rs b/contracts/coretime-market/src/lib.rs
new file mode 100755
index 0000000..b078789
--- /dev/null
+++ b/contracts/coretime-market/src/lib.rs
@@ -0,0 +1,97 @@
+// This file is part of RegionX.
+//
+// RegionX is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// RegionX 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 General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with RegionX.  If not, see <https://www.gnu.org/licenses/>.
+
+#![cfg_attr(not(feature = "std"), no_std, no_main)]
+#![feature(min_specialization)]
+
+mod types;
+
+#[openbrush::contract]
+pub mod coretime_market {
+	use crate::types::MarketError;
+	use openbrush::traits::Storage;
+	use primitives::{coretime::RawRegionId, Version};
+
+	#[ink(storage)]
+	#[derive(Default, Storage)]
+	pub struct CoretimeMarket {
+		// FIXME: ink! smart contract boilerplate
+		foo: u8,
+	}
+
+	impl CoretimeMarket {
+		#[ink(constructor)]
+		pub fn new() -> Self {
+			Default::default()
+		}
+
+		/// A function for listing a region on sale.
+		///
+		/// ## Arguments:
+		/// - `region_id`: The `u128` encoded identifier of the region that the caller intends to
+		///   list for sale.
+		/// - `bit_price`: The price for the smallest unit of the region. This is the price for a
+		///   single bit of the region's coremask, i.e., 1/80th of the total price.
+		#[ink(message)]
+		pub fn list_region(
+			&self,
+			_region_id: RawRegionId,
+			_bit_price: Balance,
+		) -> Result<(), MarketError> {
+			todo!()
+		}
+
+		/// A function for unlisting a region on sale.
+		///
+		/// ## Arguments:
+		/// - `region_id`: The `u128` encoded identifier of the region that the caller intends to
+		///   unlist from sale.
+		#[ink(message)]
+		pub fn unlist_region(&self, _region_id: RawRegionId) -> Result<(), MarketError> {
+			todo!()
+		}
+
+		/// A function for updating a listed region's bit price.
+		///
+		/// ## Arguments:
+		/// - `region_id`: The `u128` encoded identifier of the region being listed for sale.
+		/// - `bit_price`: The new price for the smallest unit of the region. This is the price for
+		///   a single bit of the region's coremask, i.e., 1/80th of the total price.
+		#[ink(message)]
+		pub fn update_region_price(
+			&self,
+			_region_id: RawRegionId,
+			_new_bit_price: Balance,
+		) -> Result<(), MarketError> {
+			todo!()
+		}
+
+		/// A function for purchasing a region listed on sale.
+		///
+		/// ## Arguments:
+		/// - `region_id`: The `u128` encoded identifier of the region being listed for sale.
+		/// - `metadata_version`: The required metadata version for the region. If the
+		///   `metadata_version` does not match the current version stored in the xc-regions
+		///   contract the purchase will fail.
+		#[ink(message)]
+		pub fn purchase_region(
+			&self,
+			_region_id: RawRegionId,
+			_metadata_version: Version,
+		) -> Result<(), MarketError> {
+			todo!()
+		}
+	}
+}
diff --git a/contracts/coretime-market/lib.rs b/contracts/coretime-market/src/types.rs
old mode 100755
new mode 100644
similarity index 58%
rename from contracts/coretime-market/lib.rs
rename to contracts/coretime-market/src/types.rs
index 29a3f72..e20f4d3
--- a/contracts/coretime-market/lib.rs
+++ b/contracts/coretime-market/src/types.rs
@@ -13,28 +13,16 @@
 // You should have received a copy of the GNU General Public License
 // along with RegionX.  If not, see <https://www.gnu.org/licenses/>.
 
-#![cfg_attr(not(feature = "std"), no_std, no_main)]
-#![feature(min_specialization)]
-
-#[openbrush::contract]
-pub mod coretime_market {
-	use openbrush::traits::Storage;
-
-	#[ink(storage)]
-	#[derive(Default, Storage)]
-	pub struct CoretimeMarket {
-		// FIXME: ink! smart contract boilerplate
-		foo: u8,
-	}
+#[derive(scale::Decode, scale::Encode, Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "std", derive(scale_info::TypeInfo))]
+pub enum MarketError {
+	Foo,
+}
 
-	impl CoretimeMarket {
-		#[ink(constructor)]
-		pub fn new() -> Self {
-			Default::default()
+impl core::fmt::Display for MarketError {
+	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+		match self {
+			MarketError::Foo => write!(f, "Foo"),
 		}
-
-		// FIXME: ink! smart contract boilerplate
-		#[ink(message)]
-		pub fn foo(&self) {}
 	}
 }