diff --git a/data/legacy/api-types.jq b/data/legacy/api-types.jq
new file mode 100644
index 0000000..d88f3ac
--- /dev/null
+++ b/data/legacy/api-types.jq
@@ -0,0 +1,17 @@
+# Migrate API values from plain URL strings to typed values (#87)
+# Usage:
+#   jq -c -f latest.ndjson > latest-with-api-types.ndjson
+
+def apitype:
+  if (.|test("bartoc|dante|bielefeld|coli-conc")) then
+    "http://bartoc.org/api-type/jskos"
+  elif (.|test("skosmos")) then
+    "http://bartoc.org/api-type/skosmos"
+  else
+    "http://bartoc.org/api-type/webservice"
+  end
+;
+
+if .API then
+  .API=(.API|map({ url: ., type: (.|apitype) }))
+else . end