diff --git a/codex/sales/reservations.nim b/codex/sales/reservations.nim
new file mode 100644
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+++ b/codex/sales/reservations.nim
@@ -0,0 +1,31 @@
+## Nim-Codex
+## Copyright (c) 2022 Status Research & Development GmbH
+## Licensed under either of
+##  * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
+##  * MIT license ([LICENSE-MIT](LICENSE-MIT))
+## at your option.
+## This file may not be copied, modified, or distributed except according to
+## those terms.
+
+import pkg/upraises
+
+push: {.upraises: [].}
+
+import pkg/datastore
+import ../stores
+
+type
+  Reservations* = object
+    repoStore: RepoStore
+    dataStore: Datastore
+
+proc new*(_: type Reservations, repo: RepoStore, data: Datastore): Reservations =
+  let r = Reservations(repoStore: repo, dataStore: data)
+  return r
+
+proc isAvailable(self: Reservations): Future[bool] {.async.} =
+  # TODO: query RepoStore
+  return true
+
+proc reserve*(self: Reservations, bytes: uint): Future[?!void] {.async.} =
+  return self.repoStore.reserve(bytes)
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