diff --git a/pkg/arvo/app/roller-rpc.hoon b/pkg/arvo/app/roller-rpc.hoon
index f16f4c4031..e899eb807d 100644
--- a/pkg/arvo/app/roller-rpc.hoon
+++ b/pkg/arvo/app/roller-rpc.hoon
@@ -156,6 +156,7 @@
       %cancel-transaction      (cancel-tx id +.params)
       %get-spawned             `(get-spawned id +.params spawned:scry)
       %get-unspawned           `(get-spawned id +.params unspawned:scry)
+      %spawns-remaining        `(spawns-remaining id +.params unspawned:scry)
       %get-owned-points        `(get-ships id +.params owned:scry)
       %get-transferring-for    `(get-ships id +.params transfers:scry)
       %get-manager-for         `(get-ships id +.params manager:scry)
diff --git a/pkg/arvo/lib/azimuth-roll-rpc.hoon b/pkg/arvo/lib/azimuth-roll-rpc.hoon
index 31e16eb6d1..f33d669bb9 100644
--- a/pkg/arvo/lib/azimuth-roll-rpc.hoon
+++ b/pkg/arvo/lib/azimuth-roll-rpc.hoon
@@ -491,6 +491,15 @@
     ~(params error:json-rpc id)
   [%result id (ships:to-json (scry u.ship))]
 ::
+++  spawns-remaining
+  |=  [id=@t params=(map @t json) scry=$-(@p (list @p))]
+  ^-  response:rpc
+  ?.  =((lent ~(tap by params)) 1)
+    ~(params error:json-rpc id)
+  ?~  ship=(ship:from-json params)
+    ~(params error:json-rpc id)
+  [%result id (numb:enjs:format (lent (scry u.ship)))]
+::
 ++  process-rpc
   |=  [id=@t params=(map @t json) action=l2-tx over-quota=$-(@p ?)]
   ^-  [(unit cage) response:rpc]