diff --git a/services/blob/src/http/handlers/holders.rs b/services/blob/src/http/handlers/holders.rs
--- a/services/blob/src/http/handlers/holders.rs
+++ b/services/blob/src/http/handlers/holders.rs
@@ -3,7 +3,8 @@
 use comm_lib::auth::AuthorizationCredential;
 use comm_lib::blob::types::http::{
   AssignHoldersRequest, AssignHoldersResponse, BlobInfo,
-  HolderAssignmentResult, RemoveHoldersRequest, RemoveHoldersResponse,
+  HolderAssignmentResult, HoldersQueryResponse, HoldersQueryUrlParams,
+  RemoveHoldersRequest, RemoveHoldersResponse,
 };
 use tracing::{info, instrument, trace, warn};
 
@@ -105,6 +106,21 @@
   Ok(HttpResponse::Ok().json(web::Json(response)))
 }
 
+#[instrument(name = "query_holders", skip_all)]
+pub async fn query_holders_handler(
+  service: web::Data<BlobService>,
+  query: web::Query<HoldersQueryUrlParams>,
+  requesting_identity: AuthorizationCredential,
+) -> actix_web::Result<HttpResponse> {
+  verify_caller_is_service(&requesting_identity)?;
+
+  let HoldersQueryUrlParams { prefix } = query.into_inner();
+  let items = service.query_indexed_holders(prefix).await?;
+
+  let response = HoldersQueryResponse { items };
+  Ok(HttpResponse::Ok().json(web::Json(response)))
+}
+
 /**
  * Returns `HTTP 400 Bad Request` if one or more blob hashes or holders
  * have invalid format. See [`comm_lib::tools::is_valid_identifier`] for
diff --git a/services/blob/src/http/mod.rs b/services/blob/src/http/mod.rs
--- a/services/blob/src/http/mod.rs
+++ b/services/blob/src/http/mod.rs
@@ -48,6 +48,7 @@
       .service(
         web::resource("/holders")
           .wrap(auth_middleware)
+          .route(web::get().to(handlers::holders::query_holders_handler))
           .route(web::post().to(handlers::holders::assign_holders_handler))
           .route(web::delete().to(handlers::holders::remove_holders_handler)),
       )
diff --git a/shared/comm-lib/src/blob/types.rs b/shared/comm-lib/src/blob/types.rs
--- a/shared/comm-lib/src/blob/types.rs
+++ b/shared/comm-lib/src/blob/types.rs
@@ -55,6 +55,16 @@
     pub failed_requests: Vec<BlobInfo>,
   }
 
+  // Query holders by prefix
+  #[derive(Serialize, Deserialize, Debug)]
+  pub struct HoldersQueryUrlParams {
+    pub prefix: String,
+  }
+  #[derive(Serialize, Deserialize, Debug)]
+  pub struct HoldersQueryResponse {
+    pub items: Vec<BlobInfo>,
+  }
+
   // Single holder endpoint types
 
   #[derive(Serialize, Deserialize, Debug)]