diff --git a/codex/contracts/interactions/clientinteractions.nim b/codex/contracts/interactions/clientinteractions.nim
index c30a22e4..e2354d85 100644
--- a/codex/contracts/interactions/clientinteractions.nim
+++ b/codex/contracts/interactions/clientinteractions.nim
@@ -7,7 +7,7 @@ import ../clock
 import ./interactions
 
 export purchasing
-export chronicles
+export chronicles except toJson
 
 type
   ClientInteractions* = ref object of ContractInteractions
diff --git a/codex/contracts/interactions/hostinteractions.nim b/codex/contracts/interactions/hostinteractions.nim
index bfb9ac9c..e9749df5 100644
--- a/codex/contracts/interactions/hostinteractions.nim
+++ b/codex/contracts/interactions/hostinteractions.nim
@@ -5,7 +5,7 @@ import ../../sales
 import ./interactions
 
 export sales
-export chronicles
+export chronicles except toJson
 
 type
   HostInteractions* = ref object of ContractInteractions
diff --git a/codex/contracts/marketplace.nim b/codex/contracts/marketplace.nim
index f09e8720..721e5ce5 100644
--- a/codex/contracts/marketplace.nim
+++ b/codex/contracts/marketplace.nim
@@ -8,8 +8,8 @@ import ./requests
 import ./config
 
 export stint
-export ethers
-export erc20
+export ethers except `%`, `%*`, toJson
+export erc20 except `%`, `%*`, toJson
 export config
 export requests
 
diff --git a/codex/contracts/requests.nim b/codex/contracts/requests.nim
index 1abfcd7e..60c3c577 100644
--- a/codex/contracts/requests.nim
+++ b/codex/contracts/requests.nim
@@ -75,6 +75,10 @@ proc fromHex*[T: distinct](_: type T, hex: string): T =
   type baseType = T.distinctBase
   T baseType.fromHex(hex)
 
+proc toHex*[T: distinct](id: T): string =
+  type baseType = T.distinctBase
+  baseType(id).toHex
+
 func fromTuple(_: type StorageRequest, tupl: tuple): StorageRequest =
   StorageRequest(
     client: tupl[0],
diff --git a/codex/rest/api.nim b/codex/rest/api.nim
index 7eb6d578..deea019b 100644
--- a/codex/rest/api.nim
+++ b/codex/rest/api.nim
@@ -16,11 +16,10 @@ import std/sequtils
 
 import pkg/questionable
 import pkg/questionable/results
-import pkg/chronicles
+import pkg/chronicles except toJson
 import pkg/chronos
-import pkg/presto
-import pkg/libp2p
-import pkg/metrics
+import pkg/presto except toJson
+import pkg/metrics except toJson
 import pkg/stew/base10
 import pkg/stew/byteutils
 import pkg/confutils
@@ -32,8 +31,10 @@ import pkg/codexdht/discv5/spr as spr
 import ../node
 import ../blocktype
 import ../conf
-import ../contracts except `%*`, `%` # imported from contracts/marketplace (exporting ethers)
-import ../streams
+import ../contracts
+import ../manifest
+import ../streams/asyncstreamwrapper
+import ../stores/blockstore
 
 import ./coders
 import ./json
@@ -197,6 +198,29 @@ proc initSalesApi(node: CodexNodeRef, router: var RestRouter) =
         trace "Excepting processing request", exc = exc.msg
         return RestApiResponse.error(Http500)
 
+  router.api(
+    MethodGet,
+    "/api/codex/v1/sales/slots/{slotId}") do (slotId: SlotId) -> RestApiResponse:
+      ## Returns active slot with id {slotId} for the host. Returns 404 if the
+      ## slot is not active for the host.
+
+      without contracts =? node.contracts.host:
+        return RestApiResponse.error(Http503, "Sales unavailable")
+
+      without slotId =? slotId.tryGet.catch, error:
+        return RestApiResponse.error(Http400, error.msg)
+
+      without agent =? await contracts.sales.activeSale(slotId):
+        return RestApiResponse.error(Http404, "Provider not filling slot")
+
+      let restAgent = RestSalesAgent(
+        state: agent.state() |? "none",
+        slotIndex: agent.data.slotIndex,
+        requestId: agent.data.requestId
+      )
+
+      return RestApiResponse.response(restAgent.toJson, contentType="application/json")
+
   router.api(
     MethodGet,
     "/api/codex/v1/sales/availability") do () -> RestApiResponse:
diff --git a/codex/rest/coders.nim b/codex/rest/coders.nim
index 66b41ee3..2fa4da49 100644
--- a/codex/rest/coders.nim
+++ b/codex/rest/coders.nim
@@ -84,7 +84,7 @@ proc decodeString*(_: type array[32, byte],
   except ValueError as e:
     err e.msg.cstring
 
-proc decodeString*[T: PurchaseId | RequestId | Nonce](_: type T,
+proc decodeString*[T: PurchaseId | RequestId | Nonce | SlotId](_: type T,
                   value: string): Result[T, cstring] =
   array[32, byte].decodeString(value).map(id => T(id))
 
diff --git a/codex/rest/json.nim b/codex/rest/json.nim
index da26af0a..c7892aa7 100644
--- a/codex/rest/json.nim
+++ b/codex/rest/json.nim
@@ -1,5 +1,4 @@
 import pkg/questionable
-import pkg/questionable/results
 import pkg/stew/byteutils
 import pkg/libp2p
 import pkg/codexdht/discv5/node as dn
@@ -7,7 +6,6 @@ import pkg/codexdht/discv5/routing_table as rt
 import ../sales
 import ../purchasing
 import ../utils/json
-import ../units
 import ../manifest
 
 export json
@@ -34,6 +32,11 @@ type
     minPrice* {.serialize.}: UInt256
     maxCollateral* {.serialize.}: UInt256
 
+  RestSalesAgent* = object
+    state* {.serialize.}: string
+    requestId* {.serialize.}: RequestId
+    slotIndex* {.serialize.}: UInt256
+
   RestContent* = object
     cid* {.serialize.}: Cid
     manifest* {.serialize.}: Manifest
diff --git a/codex/sales.nim b/codex/sales.nim
index b68f9ccc..53b5860b 100644
--- a/codex/sales.nim
+++ b/codex/sales.nim
@@ -39,6 +39,7 @@ import ./utils/trackedfutures
 
 export stint
 export reservations
+export salesagent
 
 logScope:
   topics = "sales marketplace"
@@ -208,6 +209,14 @@ proc mySlots*(sales: Sales): Future[seq[Slot]] {.async.} =
 
   return slots
 
+proc activeSale*(sales: Sales, slotId: SlotId): Future[?SalesAgent] {.async.} =
+  let market = sales.context.market
+  for agent in sales.agents:
+    if slotId(agent.data.requestId, agent.data.slotIndex) == slotId:
+      return some agent
+
+  return none SalesAgent
+
 proc load*(sales: Sales) {.async.} =
   let activeSlots = await sales.mySlots()
 
diff --git a/codex/sales/reservations.nim b/codex/sales/reservations.nim
index 19aff95d..001d6a5a 100644
--- a/codex/sales/reservations.nim
+++ b/codex/sales/reservations.nim
@@ -28,7 +28,7 @@ push: {.upraises: [].}
 
 import std/typetraits
 import pkg/chronos
-import pkg/chronicles
+import pkg/chronicles except toJson
 import pkg/datastore
 import pkg/nimcrypto
 import pkg/questionable
@@ -40,7 +40,7 @@ import ../contracts/requests
 import ../utils/json
 
 export requests
-export chronicles
+export chronicles except toJson
 
 logScope:
   topics = "sales reservations"
diff --git a/codex/sales/salesagent.nim b/codex/sales/salesagent.nim
index 3db520b4..b189650d 100644
--- a/codex/sales/salesagent.nim
+++ b/codex/sales/salesagent.nim
@@ -59,6 +59,11 @@ proc retrieveRequestState*(agent: SalesAgent): Future[?RequestState] {.async.} =
   let market = agent.context.market
   return await market.requestState(data.requestId)
 
+func state*(agent: SalesAgent): ?string =
+  proc description(state: State): string =
+    $state
+  agent.query(description)
+
 proc subscribeCancellation(agent: SalesAgent) {.async.} =
   let data = agent.data
   let clock = agent.context.clock
diff --git a/codex/utils/asyncstatemachine.nim b/codex/utils/asyncstatemachine.nim
index b01cba79..27d09b64 100644
--- a/codex/utils/asyncstatemachine.nim
+++ b/codex/utils/asyncstatemachine.nim
@@ -34,7 +34,7 @@ proc transition(_: type Event, previous, next: State): Event =
       return some next
 
 proc query*[T](machine: Machine, query: Query[T]): ?T =
-  if machine.state == nil:
+  if machine.state.isNil:
     none T
   else:
     some query(machine.state)
diff --git a/codex/utils/fileutils.nim b/codex/utils/fileutils.nim
index af56ba58..03cffeba 100644
--- a/codex/utils/fileutils.nim
+++ b/codex/utils/fileutils.nim
@@ -18,7 +18,7 @@ import pkg/chronicles
 import stew/io2
 
 export io2
-export chronicles
+export chronicles except toJson
 
 when defined(windows):
   import stew/[windows/acl]
diff --git a/codex/utils/json.nim b/codex/utils/json.nim
index 8ece70e0..ade6936d 100644
--- a/codex/utils/json.nim
+++ b/codex/utils/json.nim
@@ -303,8 +303,7 @@ func `%`*[T: distinct](id: T): JsonNode =
   type baseType = T.distinctBase
   % baseType(id)
 
-func toJson*(obj: object): string = $(%obj)
-func toJson*(obj: ref object): string = $(%obj)
+func toJson*[T](item: T): string = $(%item)
 
 proc toJsnImpl(x: NimNode): NimNode =
   case x.kind
diff --git a/openapi.yaml b/openapi.yaml
index 90fdc732..e3eeaa36 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -25,6 +25,11 @@ components:
       description: Content Identifier as specified at https://github.com/multiformats/cid
       example: QmYyQSo1c1Ym7orWxLYvCrM2EmxFTANf8wXmmE7DWjhx5N
 
+    SlotId:
+      type: string
+      description: Keccak hash of the abi encoded tuple (RequestId, slot index)
+      example: 268a781e0db3f7cf36b18e5f4fdb7f586ec9edd08e5500b17c0e518a769f114a
+
     LogLevel:
       type: string
       description: "One of the log levels: TRACE, DEBUG, INFO, NOTICE, WARN, ERROR or FATAL"
@@ -120,8 +125,7 @@ components:
       type: object
       properties:
         id:
-          type: string
-          description: Slot ID
+          $ref: "#/components/schemas/SlotId"
         request:
           $ref: "#/components/schemas/StorageRequest"
         slotIndex:
@@ -402,6 +406,35 @@ paths:
         "503":
           description: Sales are unavailable
 
+  "/sales/slots/{slotId}":
+    get:
+      summary: "Returns active slot with id {slotId} for the host"
+      tags: [ Marketplace ]
+      operationId: getActiveSlotById
+      parameters:
+        - in: path
+          name: slotId
+          required: true
+          schema:
+            $ref: "#/components/schemas/Cid"
+          description: File to be downloaded.
+      responses:
+        "200":
+          description: Retrieved active slot
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Slot"
+
+        "400":
+          description: Invalid or missing SlotId
+
+        "404":
+          description: Host is not in an active sale for the slot
+
+        "503":
+          description: Sales are unavailable
+
   "/sales/availability":
     get:
       summary: "Returns storage that is for sale"
@@ -504,9 +537,7 @@ paths:
           content:
             application/json:
               schema:
-                type: array
-                items:
-                  $ref: "#/components/schemas/Purchase"
+                $ref: "#/components/schemas/Purchase"
         "400":
           description: Invalid or missing Purchase ID
         "404":
diff --git a/tests/codex/utils/testjson.nim b/tests/codex/utils/testjson.nim
index a32f3bdb..aa3731e5 100644
--- a/tests/codex/utils/testjson.nim
+++ b/tests/codex/utils/testjson.nim
@@ -3,7 +3,7 @@ import std/options
 import std/strformat
 import std/strutils
 import std/unittest
-import pkg/chronicles
+import pkg/chronicles except toJson
 import pkg/stew/byteutils
 import pkg/stint
 import pkg/codex/contracts/requests
diff --git a/tests/contracts/testClock.nim b/tests/contracts/testClock.nim
index 7f691eaf..fafb6092 100644
--- a/tests/contracts/testClock.nim
+++ b/tests/contracts/testClock.nim
@@ -1,6 +1,7 @@
 import std/times
 import pkg/chronos
 import codex/contracts/clock
+import codex/utils/json
 import ../ethertest
 
 ethersuite "On-Chain Clock":
diff --git a/tests/ethertest.nim b/tests/ethertest.nim
index 3a76cd2e..a1c64948 100644
--- a/tests/ethertest.nim
+++ b/tests/ethertest.nim
@@ -26,4 +26,4 @@ template ethersuite*(name, body) =
     body
 
 export asynctest
-export ethers
+export ethers except `%`
diff --git a/tests/integration/codexclient.nim b/tests/integration/codexclient.nim
index 28739d7d..285d365f 100644
--- a/tests/integration/codexclient.nim
+++ b/tests/integration/codexclient.nim
@@ -11,6 +11,8 @@ import pkg/codex/purchasing
 import pkg/codex/errors
 import pkg/codex/sales/reservations
 
+export purchasing
+
 type CodexClient* = ref object
   http: HttpClient
   baseurl: string
@@ -106,6 +108,18 @@ proc getPurchase*(client: CodexClient, purchaseId: PurchaseId): ?!RestPurchase =
   let json = ? parseJson(body).catch
   RestPurchase.fromJson(json)
 
+proc getSalesAgent*(client: CodexClient, slotId: SlotId): ?!RestSalesAgent =
+  let url = client.baseurl & "/sales/slots/" & slotId.toHex
+  echo "getting sales agent for id, ", slotId.toHex
+  try:
+    let body = client.http.getContent(url)
+    echo "get sales agent body: ", body
+    let json = ? parseJson(body).catch
+    return RestSalesAgent.fromJson(json)
+  except CatchableError as e:
+    echo "[client.getSalesAgent] error getting agent: ", e.msg
+    return failure e.msg
+
 proc getSlots*(client: CodexClient): ?!seq[Slot] =
   let url = client.baseurl & "/sales/slots"
   let body = client.http.getContent(url)
@@ -126,7 +140,7 @@ proc postAvailability*(
     "maxCollateral": maxCollateral,
   }
   let response = client.http.post(url, $json)
-  assert response.status == "200 OK"
+  doAssert response.status == "200 OK", "expected 200 OK, got " & response.status & ", body: " & response.body
   Availability.fromJson(response.body.parseJson)
 
 proc getAvailabilities*(client: CodexClient): ?!seq[Availability] =
@@ -141,3 +155,12 @@ proc close*(client: CodexClient) =
 proc restart*(client: CodexClient) =
   client.http.close()
   client.http = newHttpClient()
+
+proc purchaseStateIs*(client: CodexClient, id: PurchaseId, state: string): bool =
+  client.getPurchase(id).option.?state == some state
+
+proc saleStateIs*(client: CodexClient, id: SlotId, state: string): bool =
+  client.getSalesAgent(id).option.?state == some state
+
+proc requestId*(client: CodexClient, id: PurchaseId): ?RequestId =
+  return client.getPurchase(id).option.?requestId