diff --git a/codex/codex.nim b/codex/codex.nim
index ce353814..55fc1965 100644
--- a/codex/codex.nim
+++ b/codex/codex.nim
@@ -94,7 +94,10 @@ proc stop*(s: CodexServer) {.async.} =
 
   s.runHandle.complete()
 
-proc new(_: type ContractInteractions, config: CodexConf): ?ContractInteractions =
+proc new(_: type ContractInteractions,
+  config: CodexConf,
+  repo: RepoStore): Contracts =
+
   if not config.persistence:
     if config.ethAccount.isSome:
       warn "Ethereum account was set, but persistence is not enabled"
@@ -104,10 +107,16 @@ proc new(_: type ContractInteractions, config: CodexConf): ?ContractInteractions
     error "Persistence enabled, but no Ethereum account was set"
     quit QuitFailure
 
+  var client: ?ClientInteractions
+  var host: ?HostInteractions
   if deployment =? config.ethDeployment:
-    ContractInteractions.new(config.ethProvider, account, deployment)
+    client = ClientInteractions.new(config.ethProvider, account, deployment)
+    host = HostInteractions.new(config.ethProvider, account, repo, deployment)
   else:
-    ContractInteractions.new(config.ethProvider, account)
+    client = ClientInteractions.new(config.ethProvider, account)
+    host = HostInteractions.new(config.ethProvider, account, repo)
+
+  (client, host)
 
 proc new*(T: type CodexServer, config: CodexConf, privateKey: CodexPrivateKey): T =
 
diff --git a/codex/contracts/interactions.nim b/codex/contracts/interactions.nim
index 4cf16492..de77348b 100644
--- a/codex/contracts/interactions.nim
+++ b/codex/contracts/interactions.nim
@@ -1,78 +1,5 @@
-import pkg/ethers
-import pkg/chronicles
-import ../purchasing
-import ../sales
-import ../proving
-import ./deployment
-import ./marketplace
-import ./market
-import ./proofs
-import ./clock
+import ./interactions/interactions
+import ./interactions/hostinteractions
+import ./interactions/clientinteractions
 
-export purchasing
-export sales
-export proving
-export chronicles
-
-type
-  ContractInteractions* = ref object
-    purchasing*: Purchasing
-    sales*: Sales
-    proving*: Proving
-    clock: OnChainClock
-
-proc new*(_: type ContractInteractions,
-          signer: Signer,
-          deployment: Deployment): ?ContractInteractions =
-
-  without address =? deployment.address(Marketplace):
-    error "Unable to determine address of the Marketplace smart contract"
-    return none ContractInteractions
-
-  let contract = Marketplace.new(address, signer)
-  let market = OnChainMarket.new(contract)
-  let proofs = OnChainProofs.new(contract)
-  let clock = OnChainClock.new(signer.provider)
-  let proving = Proving.new(proofs, clock)
-  some ContractInteractions(
-    purchasing: Purchasing.new(market, clock),
-    sales: Sales.new(market, clock, proving),
-    proving: proving,
-    clock: clock
-  )
-
-proc new*(_: type ContractInteractions,
-          providerUrl: string,
-          account: Address,
-          deploymentFile: string = string.default): ?ContractInteractions =
-
-  let provider = JsonRpcProvider.new(providerUrl)
-  let signer = provider.getSigner(account)
-
-  var deploy: Deployment
-  try:
-    if deploymentFile == string.default:
-      deploy = deployment()
-    else:
-      deploy = deployment(deploymentFile)
-  except IOError as e:
-    error "Unable to read deployment json", msg = e.msg
-    return none ContractInteractions
-
-  ContractInteractions.new(signer, deploy)
-
-proc new*(_: type ContractInteractions,
-          account: Address): ?ContractInteractions =
-  ContractInteractions.new("ws://localhost:8545", account)
-
-proc start*(interactions: ContractInteractions) {.async.} =
-  await interactions.clock.start()
-  await interactions.sales.start()
-  await interactions.proving.start()
-  await interactions.purchasing.start()
-
-proc stop*(interactions: ContractInteractions) {.async.} =
-  await interactions.purchasing.stop()
-  await interactions.sales.stop()
-  await interactions.proving.stop()
-  await interactions.clock.stop()
+export interactions, hostinteractions, clientinteractions
\ No newline at end of file
diff --git a/codex/contracts/interactions/clientinteractions.nim b/codex/contracts/interactions/clientinteractions.nim
new file mode 100644
index 00000000..a71aa46f
--- /dev/null
+++ b/codex/contracts/interactions/clientinteractions.nim
@@ -0,0 +1,55 @@
+import pkg/ethers
+import pkg/chronicles
+
+import ../../purchasing
+import ../deployment
+import ../marketplace
+import ../market
+import ../proofs
+import ../clock
+import ./interactions
+
+export purchasing
+export chronicles
+
+type
+  ClientInteractions* = ref object of ContractInteractions
+    purchasing*: Purchasing
+
+proc new*(_: type ClientInteractions,
+          signer: Signer,
+          deployment: Deployment): ?ClientInteractions =
+
+  without address =? deployment.address(Marketplace):
+    error "Unable to determine address of the Marketplace smart contract"
+    return none ClientInteractions
+
+  let contract = Marketplace.new(address, signer)
+  let market = OnChainMarket.new(contract)
+  let clock = OnChainClock.new(signer.provider)
+
+  let c = ClientInteractions.new(clock)
+  c.purchasing = Purchasing.new(market, clock)
+  some c
+
+proc new*(_: type ClientInteractions,
+          providerUrl: string,
+          account: Address,
+          deploymentFile: string = string.default): ?ClientInteractions =
+
+  without prepared =? prepare(providerUrl, account, deploymentFile):
+    return none ClientInteractions
+
+  ClientInteractions.new(prepared.signer, prepared.deploy)
+
+proc new*(_: type ClientInteractions,
+          account: Address): ?ClientInteractions =
+  ClientInteractions.new("ws://localhost:8545", account)
+
+proc start*(self: ClientInteractions) {.async.} =
+  await self.purchasing.start()
+  await procCall ContractInteractions(self).start()
+
+proc stop*(self: ClientInteractions) {.async.} =
+  await self.purchasing.stop()
+  await procCall ContractInteractions(self).stop()
diff --git a/codex/contracts/interactions/hostinteractions.nim b/codex/contracts/interactions/hostinteractions.nim
new file mode 100644
index 00000000..cf69bb9c
--- /dev/null
+++ b/codex/contracts/interactions/hostinteractions.nim
@@ -0,0 +1,67 @@
+import pkg/ethers
+import pkg/chronicles
+
+import ../../sales
+import ../../proving
+import ../../stores
+import ../deployment
+import ../marketplace
+import ../market
+import ../proofs
+import ../clock
+import ./interactions
+
+export sales
+export proving
+export chronicles
+
+type
+  HostInteractions* = ref object of ContractInteractions
+    sales*: Sales
+    proving*: Proving
+
+proc new*(_: type HostInteractions,
+          signer: Signer,
+          deployment: Deployment,
+          repoStore: RepoStore): ?HostInteractions =
+
+  without address =? deployment.address(Marketplace):
+    error "Unable to determine address of the Marketplace smart contract"
+    return none HostInteractions
+
+  let contract = Marketplace.new(address, signer)
+  let market = OnChainMarket.new(contract)
+  let proofs = OnChainProofs.new(contract)
+  let clock = OnChainClock.new(signer.provider)
+  let proving = Proving.new(proofs, clock)
+
+  let h = HostInteractions.new(clock)
+  h.sales = Sales.new(market, clock, proving, repoStore)
+  h.proving = proving
+  some h
+
+proc new*(_: type HostInteractions,
+          providerUrl: string,
+          account: Address,
+          repo: RepoStore,
+          deploymentFile: string = string.default): ?HostInteractions =
+
+  without prepared =? prepare(providerUrl, account, deploymentFile):
+    return none HostInteractions
+
+  HostInteractions.new(prepared.signer, prepared.deploy, repo)
+
+proc new*(_: type HostInteractions,
+          account: Address,
+          repo: RepoStore): ?HostInteractions =
+  HostInteractions.new("ws://localhost:8545", account, repo)
+
+method start*(self: HostInteractions) {.async.} =
+  await self.sales.start()
+  await self.proving.start()
+  await procCall ContractInteractions(self).start()
+
+method stop*(self: HostInteractions) {.async.} =
+  await self.sales.stop()
+  await self.proving.stop()
+  await procCall ContractInteractions(self).start()
diff --git a/codex/contracts/interactions/interactions.nim b/codex/contracts/interactions/interactions.nim
new file mode 100644
index 00000000..a8101492
--- /dev/null
+++ b/codex/contracts/interactions/interactions.nim
@@ -0,0 +1,45 @@
+import pkg/ethers
+import pkg/chronicles
+import pkg/questionable
+import pkg/questionable/results
+import ../../errors
+import ../deployment
+import ../clock
+
+type
+  ContractInteractions* = ref object of RootObj
+    clock: OnChainClock
+  ContractInteractionsError* = object of CodexError
+  ReadDeploymentFileFailureError* = object of ContractInteractionsError
+
+method new*[T: ContractInteractions](_: type T, clock: OnChainClock): T {.base.} =
+  T(clock: clock)
+
+proc prepare*(
+  providerUrl: string = "ws://localhost:8545",
+  account: Address,
+  deploymentFile: string = string.default):
+  ?!tuple[signer: JsonRpcSigner, deploy: Deployment] =
+
+  let provider = JsonRpcProvider.new(providerUrl)
+  let signer = provider.getSigner(account)
+
+  var deploy: Deployment
+  try:
+    if deploymentFile == string.default:
+      deploy = deployment()
+    else:
+      deploy = deployment(deploymentFile)
+  except IOError as e:
+    let err = newException(ReadDeploymentFileFailureError,
+      "Unable to read deployment json")
+    err.parent = e
+    return failure(err)
+
+  return success((signer, deploy))
+
+method start*(interactions: ContractInteractions) {.async, base.} =
+  await interactions.clock.start()
+
+method stop*(interactions: ContractInteractions) {.async, base.} =
+  await interactions.clock.stop()
diff --git a/codex/node.nim b/codex/node.nim
index b7d4af43..7ceaf404 100644
--- a/codex/node.nim
+++ b/codex/node.nim
@@ -43,6 +43,10 @@ type
 
   CodexError = object of CatchableError
 
+  Contracts* = tuple
+    client: ?ClientInteractions
+    host: ?HostInteractions
+
   CodexNodeRef* = ref object
     switch*: Switch
     networkId*: PeerID
@@ -50,7 +54,7 @@ type
     engine*: BlockExcEngine
     erasure*: Erasure
     discovery*: Discovery
-    contracts*: ?ContractInteractions
+    contracts*: Contracts
 
 proc findPeer*(
   node: CodexNodeRef,
@@ -250,7 +254,7 @@ proc requestStorage*(self: CodexNodeRef,
   ##
   trace "Received a request for storage!", cid, duration, nodes, tolerance, reward
 
-  without contracts =? self.contracts:
+  without contracts =? self.contracts.client:
     trace "Purchasing not available"
     return failure "Purchasing not available"
 
@@ -307,7 +311,7 @@ proc new*(
   engine: BlockExcEngine,
   erasure: Erasure,
   discovery: Discovery,
-  contracts = ContractInteractions.none): T =
+  contracts: Contracts = (ClientInteractions.none, HostInteractions.none)): T =
   T(
     switch: switch,
     blockStore: store,
@@ -329,7 +333,7 @@ proc start*(node: CodexNodeRef) {.async.} =
   if not node.discovery.isNil:
     await node.discovery.start()
 
-  if contracts =? node.contracts:
+  if contracts =? node.contracts.host:
     # TODO: remove Sales callbacks, pass BlockStore and StorageProofs instead
     contracts.sales.onStore = proc(request: StorageRequest,
                                    slot: UInt256,
@@ -369,7 +373,7 @@ proc start*(node: CodexNodeRef) {.async.} =
       await contracts.start()
     except CatchableError as error:
       error "Unable to start contract interactions: ", error=error.msg
-      node.contracts = ContractInteractions.none
+      node.contracts.host = HostInteractions.none
 
   node.networkId = node.switch.peerInfo.peerId
   notice "Started codex node", id = $node.networkId, addrs = node.switch.peerInfo.addrs
@@ -389,8 +393,11 @@ proc stop*(node: CodexNodeRef) {.async.} =
   if not node.discovery.isNil:
     await node.discovery.stop()
 
-  if contracts =? node.contracts:
-    await contracts.stop()
+  if clientContracts =? node.contracts.client:
+    await clientContracts.stop()
+
+  if hostContracts =? node.contracts.host:
+    await hostContracts.stop()
 
   if not node.blockStore.isNil:
     await node.blockStore.close
diff --git a/codex/rest/api.nim b/codex/rest/api.nim
index 88ed490c..f293e862 100644
--- a/codex/rest/api.nim
+++ b/codex/rest/api.nim
@@ -244,7 +244,7 @@ proc initRestApi*(node: CodexNodeRef, conf: CodexConf): RestRouter =
     "/api/codex/v1/sales/availability") do () -> RestApiResponse:
       ## Returns storage that is for sale
 
-      without contracts =? node.contracts:
+      without contracts =? node.contracts.host:
         return RestApiResponse.error(Http503, "Sales unavailable")
 
       let json = %contracts.sales.available
@@ -259,7 +259,7 @@ proc initRestApi*(node: CodexNodeRef, conf: CodexConf): RestRouter =
       ## duration   - maximum time the storage should be sold for (in seconds)
       ## minPrice   - minimum price to be paid (in amount of tokens)
 
-      without contracts =? node.contracts:
+      without contracts =? node.contracts.host:
         return RestApiResponse.error(Http503, "Sales unavailable")
 
       let body = await request.getBody()
@@ -281,7 +281,7 @@ proc initRestApi*(node: CodexNodeRef, conf: CodexConf): RestRouter =
     "/api/codex/v1/storage/purchases/{id}") do (
       id: PurchaseId) -> RestApiResponse:
 
-      without contracts =? node.contracts:
+      without contracts =? node.contracts.client:
         return RestApiResponse.error(Http503, "Purchasing unavailable")
 
       without id =? id.tryGet.catch, error:
diff --git a/tests/contracts/testInteractions.nim b/tests/contracts/testInteractions.nim
index d9dfc0de..7e031c8a 100644
--- a/tests/contracts/testInteractions.nim
+++ b/tests/contracts/testInteractions.nim
@@ -1,32 +1,63 @@
 import std/os
-import codex/contracts
+
+import pkg/datastore
+
+import pkg/codex/contracts
+import pkg/codex/stores
+
 import ../ethertest
 import ./examples
 
-ethersuite "Marketplace Contract Interactions":
+ethersuite "Marketplace Contract Client Interactions":
 
   let account = Address.example
 
-  var contracts: ContractInteractions
+  var contracts: ClientInteractions
 
   setup:
-    contracts = !ContractInteractions.new(account)
+    contracts = !ClientInteractions.new(account)
 
   test "can be instantiated with a signer and deployment info":
     let signer = provider.getSigner()
     let deployment = deployment()
-    check ContractInteractions.new(signer, deployment).isSome
+    check ClientInteractions.new(signer, deployment).isSome
 
   test "can be instantiated with a provider url":
     let url = "http://localhost:8545"
     let account = Address.example
     let deployment = "vendor" / "codex-contracts-eth" / "deployment-localhost.json"
-    check ContractInteractions.new(url, account).isSome
-    check ContractInteractions.new(url, account, deployment).isSome
+    check ClientInteractions.new(url, account).isSome
+    check ClientInteractions.new(url, account, deployment).isSome
 
   test "provides purchasing":
     check contracts.purchasing != nil
 
+ethersuite "Marketplace Contract Host Interactions":
+
+  let account = Address.example
+
+  var
+    contracts: HostInteractions
+    repo: RepoStore
+
+  setup:
+    let repoDs = SQLiteDatastore.new(Memory).tryGet()
+    let metaDs = SQLiteDatastore.new(Memory).tryGet()
+    repo = RepoStore.new(repoDs, metaDs)
+    contracts = !HostInteractions.new(account, repo)
+
+  test "can be instantiated with a signer and deployment info":
+    let signer = provider.getSigner()
+    let deployment = deployment()
+    check HostInteractions.new(signer, deployment, repo).isSome
+
+  test "can be instantiated with a provider url":
+    let url = "http://localhost:8545"
+    let account = Address.example
+    let deployment = "vendor" / "codex-contracts-eth" / "deployment-localhost.json"
+    check HostInteractions.new(url, account, repo).isSome
+    check HostInteractions.new(url, account, repo, deployment).isSome
+
   test "provides sales":
     check contracts.sales != nil