diff --git a/services/item.lua b/services/item.lua
index cbac891..6bf9222 100644
--- a/services/item.lua
+++ b/services/item.lua
@@ -1 +1,13 @@
--- Item service
\ No newline at end of file
+-- Item service
+
+-- on purchase, check if has item, if not `kristify.pay(addrs, price, {message = disp not in stock})` and return a string error
+-- if it has item, drop it.
+local function onPurchase(params, kristify, addrs, price, disp)
+
+end
+
+
+-- returns the stock of params.id.
+local function getStock(params)
+  
+end
\ No newline at end of file
diff --git a/services/link.lua b/services/link.lua
index 5754563..c93300e 100644
--- a/services/link.lua
+++ b/services/link.lua
@@ -1 +1,10 @@
--- Link service
\ No newline at end of file
+-- Link service
+
+local function onPurchase(params, kristify)
+  kristify.popup(params.link, 10)
+  return true
+end
+
+local function getStock(params)
+  return " ∞ "
+end
\ No newline at end of file