diff --git a/catalyst/marketplace/marketplace.py b/catalyst/marketplace/marketplace.py
index 8f4610cc..a6c0ff0b 100644
--- a/catalyst/marketplace/marketplace.py
+++ b/catalyst/marketplace/marketplace.py
@@ -1,15 +1,52 @@
+import json
+import os
+
+from web3 import Web3, HTTPProvider
+
+CONTRACT_PATH = os.path.join(
+    '..', '..', 'marketplace', 'build', 'contracts', 'Marketplace.json'
+)
+CONTRACT_ADDRESS = Web3.toChecksumAddress(
+    '0x345ca3e014aaf5dca488057592ee47305d9b3e10'
+)
+
+
+# we'll use one of our default accounts to deploy from. every write to the chain requires a
+# payment of ethereum called "gas". if we were running an actual test ethereum node locally,
+# then we'd have to go on the test net and get some free ethereum to play with. that is beyond
+# the scope of this tutorial so we're using a mini local node that has unlimited ethereum and
+# the only chain we're using is our own local one
+
+
 class Marketplace:
     def __init__(self):
-        pass
+        with open(CONTRACT_PATH) as handle:
+            json_interface = json.load(handle)
+
+            w3 = Web3(HTTPProvider('http://localhost:7545'))
+
+            self.contract = w3.eth.contract(
+                CONTRACT_ADDRESS,
+                abi=json_interface['abi'],
+            )  # Type: Contract
+            self.default_account = w3.eth.accounts[1]
+
+            pass
 
     def list(self):
+        subscribers = self.contract.call(
+            {'from': self.default_account}
+        ).getSubscribers()
         pass
 
     def register(self, data_source_name):
+        test = self.contract.transact(
+            {'from': self.default_account}
+        ).subscribe(0)
         pass
 
     def ingest(self, data_source_name, data_frequency, start, end):
         pass
 
     def clean(self, data_source_name):
-        pass
\ No newline at end of file
+        pass
diff --git a/marketplace/contracts/Marketplace.sol b/marketplace/contracts/Marketplace.sol
index 54a14d1a..30401e5b 100644
--- a/marketplace/contracts/Marketplace.sol
+++ b/marketplace/contracts/Marketplace.sol
@@ -5,7 +5,7 @@ contract Marketplace {
 
     // Adopting a pet
     function subscribe(uint dataSourceId) public returns (uint) {
-        require(dataSourceId >= 0 && dataSourceId <= 1);
+        require(dataSourceId >= 0 && dataSourceId <= 5);
 
         subscribers[dataSourceId] = msg.sender;
 
diff --git a/tests/marketplace/__init__.py b/tests/marketplace/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/marketplace/test_marketplace.py b/tests/marketplace/test_marketplace.py
new file mode 100644
index 00000000..e03efc43
--- /dev/null
+++ b/tests/marketplace/test_marketplace.py
@@ -0,0 +1,4 @@
+from catalyst.marketplace.marketplace import Marketplace
+
+marketplace = Marketplace()
+pass
\ No newline at end of file