diff --git a/tests/test_coordinator.py b/tests/test_coordinator.py
index f55d9352..e9711152 100644
--- a/tests/test_coordinator.py
+++ b/tests/test_coordinator.py
@@ -8,6 +8,9 @@
 TRANSCRIPT_SIZE = 500
 TIMEOUT = 1000
 MAX_DKG_SIZE = 64
+FEE_RATE = 42
+ERC20_SUPPLY = 10**24
+DURATION = 1234
 
 RitualState = IntEnum(
     "RitualState",
@@ -34,8 +37,12 @@ def initiator(accounts):
 
 
 @pytest.fixture(scope="module")
-def stake_info(project, accounts, nodes):
-    deployer = accounts[8]
+def deployer(accounts):
+    return accounts[8]
+
+
+@pytest.fixture()
+def stake_info(project, deployer, nodes):
     contract = project.StakeInfo.deploy([deployer], sender=deployer)
     for n in nodes:
         contract.updateOperator(n, n, sender=deployer)
@@ -43,9 +50,37 @@ def stake_info(project, accounts, nodes):
     return contract
 
 
-@pytest.fixture(scope="module")
-def coordinator(project, accounts, stake_info):
-    return project.Coordinator.deploy(stake_info.address, TIMEOUT, MAX_DKG_SIZE, sender=accounts[8])
+@pytest.fixture()
+def erc20(project, initiator):
+    # Create an ERC20 token (using NuCypherToken because it's easier, but could be any ERC20)
+    token = project.NuCypherToken.deploy(ERC20_SUPPLY, sender=initiator)
+    return token
+
+
+@pytest.fixture()
+def flat_rate_fee_model(project, deployer, stake_info, erc20):
+    contract = project.FlatRateFeeModel.deploy(
+        erc20.address,
+        FEE_RATE,
+        stake_info.address,
+        sender=deployer
+    )
+    return contract
+
+
+@pytest.fixture()
+def coordinator(project, deployer, stake_info, flat_rate_fee_model, initiator):
+    admin = deployer
+    contract = project.Coordinator.deploy(
+        stake_info.address,
+        TIMEOUT,
+        MAX_DKG_SIZE,
+        admin,
+        flat_rate_fee_model.address,
+        sender=deployer
+    )
+    contract.grantRole(contract.INITIATOR_ROLE(), initiator, sender=admin)
+    return contract
 
 
 def test_initial_parameters(coordinator):
@@ -54,14 +89,29 @@ def test_initial_parameters(coordinator):
     assert coordinator.numberOfRituals() == 0
 
 
-def test_initiate_ritual(coordinator, nodes, initiator):
+def test_invalid_initiate_ritual(coordinator, nodes, accounts, initiator):
+    with ape.reverts("Sender can't initiate ritual"):
+        sender = accounts[3]
+        coordinator.initiateRitual(nodes, sender, DURATION, sender=sender)
+
     with ape.reverts("Invalid number of nodes"):
-        coordinator.initiateRitual(nodes[:5] * 20, sender=initiator)
+        coordinator.initiateRitual(nodes[:5] * 20, initiator, DURATION, sender=initiator)
+
+    with ape.reverts("Invalid ritual duration"):
+        coordinator.initiateRitual(nodes, initiator, 0, sender=initiator)
 
     with ape.reverts("Providers must be sorted"):
-        coordinator.initiateRitual(nodes[1:] + [nodes[0]], sender=initiator)
+        coordinator.initiateRitual(nodes[1:] + [nodes[0]], initiator, DURATION, sender=initiator)
+
+    with ape.reverts("ERC20: insufficient allowance"):
+        # Sender didn't approve enough tokens
+        coordinator.initiateRitual(nodes, initiator, DURATION, sender=initiator)
+
 
-    tx = coordinator.initiateRitual(nodes, sender=initiator)
+def test_initiate_ritual(coordinator, nodes, initiator, erc20, flat_rate_fee_model):
+    cost = flat_rate_fee_model.getRitualInitiationCost(nodes, DURATION)
+    erc20.approve(coordinator.address, cost, sender=initiator)
+    tx = coordinator.initiateRitual(nodes, initiator, DURATION, sender=initiator)
 
     events = list(coordinator.StartRitual.from_receipt(tx))
     assert len(events) == 1
@@ -73,8 +123,10 @@ def test_initiate_ritual(coordinator, nodes, initiator):
     assert coordinator.getRitualState(0) == RitualState.AWAITING_TRANSCRIPTS
 
 
-def test_post_transcript(coordinator, nodes, initiator):
-    coordinator.initiateRitual(nodes, sender=initiator)
+def test_post_transcript(coordinator, nodes, initiator, erc20, flat_rate_fee_model):
+    cost = flat_rate_fee_model.getRitualInitiationCost(nodes, DURATION)
+    erc20.approve(coordinator.address, cost, sender=initiator)
+    coordinator.initiateRitual(nodes, initiator, DURATION, sender=initiator)
 
     for node in nodes:
         assert coordinator.getRitualState(0) == RitualState.AWAITING_TRANSCRIPTS
@@ -97,21 +149,27 @@ def test_post_transcript(coordinator, nodes, initiator):
     assert coordinator.getRitualState(0) == RitualState.AWAITING_AGGREGATIONS
 
 
-def test_post_transcript_but_not_part_of_ritual(coordinator, nodes, initiator):
-    coordinator.initiateRitual(nodes, sender=initiator)
+def test_post_transcript_but_not_part_of_ritual(coordinator, nodes, initiator, erc20, flat_rate_fee_model):
+    cost = flat_rate_fee_model.getRitualInitiationCost(nodes, DURATION)
+    erc20.approve(coordinator.address, cost, sender=initiator)
+    coordinator.initiateRitual(nodes, initiator, DURATION, sender=initiator)
     with ape.reverts("Participant not part of ritual"):
         coordinator.postTranscript(0, os.urandom(TRANSCRIPT_SIZE), sender=initiator)
 
 
-def test_post_transcript_but_already_posted_transcript(coordinator, nodes, initiator):
-    coordinator.initiateRitual(nodes, sender=initiator)
+def test_post_transcript_but_already_posted_transcript(coordinator, nodes, initiator, erc20, flat_rate_fee_model):
+    cost = flat_rate_fee_model.getRitualInitiationCost(nodes, DURATION)
+    erc20.approve(coordinator.address, cost, sender=initiator)
+    coordinator.initiateRitual(nodes, initiator, DURATION, sender=initiator)
     coordinator.postTranscript(0, os.urandom(TRANSCRIPT_SIZE), sender=nodes[0])
     with ape.reverts("Node already posted transcript"):
         coordinator.postTranscript(0, os.urandom(TRANSCRIPT_SIZE), sender=nodes[0])
 
 
-def test_post_transcript_but_not_waiting_for_transcripts(coordinator, nodes, initiator):
-    coordinator.initiateRitual(nodes, sender=initiator)
+def test_post_transcript_but_not_waiting_for_transcripts(coordinator, nodes, initiator, erc20, flat_rate_fee_model):
+    cost = flat_rate_fee_model.getRitualInitiationCost(nodes, DURATION)
+    erc20.approve(coordinator.address, cost, sender=initiator)
+    coordinator.initiateRitual(nodes, initiator, DURATION, sender=initiator)
     for node in nodes:
         transcript = os.urandom(TRANSCRIPT_SIZE)
         coordinator.postTranscript(0, transcript, sender=node)
@@ -120,8 +178,10 @@ def test_post_transcript_but_not_waiting_for_transcripts(coordinator, nodes, ini
         coordinator.postTranscript(0, os.urandom(TRANSCRIPT_SIZE), sender=nodes[1])
 
 
-def test_post_aggregation(coordinator, nodes, initiator):
-    coordinator.initiateRitual(nodes, sender=initiator)
+def test_post_aggregation(coordinator, nodes, initiator, erc20, flat_rate_fee_model):
+    cost = flat_rate_fee_model.getRitualInitiationCost(nodes, DURATION)
+    erc20.approve(coordinator.address, cost, sender=initiator)
+    coordinator.initiateRitual(nodes, initiator, DURATION, sender=initiator)
     transcript = os.urandom(TRANSCRIPT_SIZE)
     for node in nodes:
         coordinator.postTranscript(0, transcript, sender=node)
@@ -152,5 +212,4 @@ def test_post_aggregation(coordinator, nodes, initiator):
     assert len(events) == 1
     event = events[0]
     assert event["ritualId"] == 0
-    assert event["initiator"] == initiator.address
     assert event["successful"]