diff --git a/cli/src/routes.rs b/cli/src/routes.rs
index cb72027..6b278c6 100644
--- a/cli/src/routes.rs
+++ b/cli/src/routes.rs
@@ -673,10 +673,21 @@ pub async fn get_address(
         let (bytes, _) = web::block(|| fetch_external(url)).await??;
         let hash_result = hash(&bytes);
         (Address::Hash(hash_result), false)
+    } else if let Some(type_str) = query.get("type") {
+        match type_str.as_str() {
+            "Hash" => (upend::database::constants::TYPE_HASH_ADDRESS.clone(), true),
+            "Uuid" => (upend::database::constants::TYPE_UUID_ADDRESS.clone(), true),
+            "Attribute" => (
+                upend::database::constants::TYPE_ATTRIBUTE_ADDRESS.clone(),
+                true,
+            ),
+            "Url" => (upend::database::constants::TYPE_URL_ADDRESS.clone(), true),
+            _ => return Err(ErrorBadRequest(format!("Unknown type: {type_str}"))),
+        }
     } else {
-        return Err(ErrorBadRequest(anyhow!(
-            "Specify one of: `attribute`, `url`, `url_content`."
-        )));
+        return Err(ErrorBadRequest(
+            "Specify one of: `attribute`, `url`, `url_content`, `type`.",
+        ));
     };
 
     let mut response = HttpResponse::Ok();
diff --git a/src/database/constants.rs b/src/database/constants.rs
index 08cd6d7..ff51580 100644
--- a/src/database/constants.rs
+++ b/src/database/constants.rs
@@ -22,4 +22,8 @@ lazy_static! {
         value: "HIER_ROOT".into(),
     };
     pub static ref HIER_ROOT_ADDR: Address = HIER_ROOT_INVARIANT.entity().unwrap();
+    pub static ref TYPE_HASH_ADDRESS: Address = Address::Hash(crate::util::hash::Hash(vec![]));
+    pub static ref TYPE_UUID_ADDRESS: Address = Address::Uuid(uuid::Uuid::nil());
+    pub static ref TYPE_ATTRIBUTE_ADDRESS: Address = Address::Attribute("".to_string());
+    pub static ref TYPE_URL_ADDRESS: Address = Address::Url(url::Url::parse("up:").unwrap());
 }
diff --git a/src/database/stores/fs/mod.rs b/src/database/stores/fs/mod.rs
index 456fb32..a42893f 100644
--- a/src/database/stores/fs/mod.rs
+++ b/src/database/stores/fs/mod.rs
@@ -2,7 +2,9 @@ use self::db::files;
 
 use super::{Blob, StoreError, UpStore, UpdatePathOutcome};
 use crate::addressing::Address;
-use crate::database::constants::{ADDED_ATTR, ATTR_BY_ATTR, IS_OF_ATTR, LABEL_ATTR};
+use crate::database::constants::{
+    ADDED_ATTR, ATTR_BY_ATTR, IS_OF_ATTR, LABEL_ATTR, TYPE_HASH_ADDRESS,
+};
 use crate::database::entry::Entry;
 use crate::database::hierarchies::{
     resolve_path, resolve_path_cached, ResolveCache, UHierPath, UNode,
@@ -103,6 +105,21 @@ impl FsStore {
         let db = db.borrow();
         let upconnection = db.connection()?;
 
+        // Initialize types, etc...
+        debug!("Initializing DB types.");
+        upend_insert_addr!(
+            upconnection,
+            Address::Attribute(FILE_SIZE_KEY.to_string()),
+            IS_OF_ATTR,
+            TYPE_HASH_ADDRESS
+        )?;
+        upend_insert_addr!(
+            upconnection,
+            Address::Attribute(FILE_MIME_KEY.to_string()),
+            IS_OF_ATTR,
+            TYPE_HASH_ADDRESS
+        )?;
+
         // Walk through the vault, find all paths
         debug!("Traversing vault directory");
         let absolute_dir_path = fs::canonicalize(&*self.path)?;