diff --git a/api/src/routes/accounting/server_cost/get.rs b/api/src/routes/accounting/server_cost/get.rs
index 36d8a6e..1e09a99 100644
--- a/api/src/routes/accounting/server_cost/get.rs
+++ b/api/src/routes/accounting/server_cost/get.rs
@@ -1,10 +1,93 @@
-use crate::error::OptionApiError;
+use crate::authorization::require_admin_user;
+use crate::error::{OptionApiError, UnexpectedOnlyError};
 use actix_web::web::{Data, Query, ReqData};
 use actix_web::HttpResponse;
-use lrzcc_wire::accounting::ServerCostParams;
-use sqlx::MySqlPool;
-
+use anyhow::Context;
+use chrono::{DateTime, Datelike, TimeZone, Utc};
+use lrzcc_wire::accounting::{
+    ServerCostAll, ServerCostParams, ServerCostProject, ServerCostServer,
+    ServerCostSimple, ServerCostUser,
+};
 use lrzcc_wire::user::{Project, User};
+use serde::Serialize;
+use sqlx::{MySql, MySqlPool, Transaction};
+
+#[derive(Serialize)]
+#[serde(untagged)]
+pub enum ServerCostForServer {
+    Normal(ServerCostSimple),
+    Detail(ServerCostServer),
+}
+
+pub async fn calculate_server_cost_for_server(
+    transaction: &mut Transaction<'_, MySql>,
+    server_uuid: &str,
+    begin: Option<DateTime<Utc>>,
+    end: Option<DateTime<Utc>>,
+    detail: Option<bool>,
+) -> Result<ServerCostForServer, UnexpectedOnlyError> {
+    todo!()
+}
+
+#[derive(Serialize)]
+#[serde(untagged)]
+pub enum ServerCostForUser {
+    Normal(ServerCostSimple),
+    Detail(ServerCostUser),
+}
+
+pub async fn calculate_server_cost_for_user(
+    transaction: &mut Transaction<'_, MySql>,
+    user_id: u64,
+    begin: Option<DateTime<Utc>>,
+    end: Option<DateTime<Utc>>,
+    detail: Option<bool>,
+) -> Result<ServerCostForUser, UnexpectedOnlyError> {
+    todo!()
+}
+
+#[derive(Serialize)]
+#[serde(untagged)]
+pub enum ServerCostForProject {
+    Normal(ServerCostSimple),
+    Detail(ServerCostProject),
+}
+
+pub async fn calculate_server_cost_for_project(
+    transaction: &mut Transaction<'_, MySql>,
+    project_id: u64,
+    begin: Option<DateTime<Utc>>,
+    end: Option<DateTime<Utc>>,
+    detail: Option<bool>,
+) -> Result<ServerCostForProject, UnexpectedOnlyError> {
+    todo!()
+}
+
+#[derive(Serialize)]
+#[serde(untagged)]
+pub enum ServerCostForAll {
+    Normal(ServerCostSimple),
+    Detail(ServerCostAll),
+}
+
+pub async fn calculate_server_cost_for_all(
+    transaction: &mut Transaction<'_, MySql>,
+    begin: Option<DateTime<Utc>>,
+    end: Option<DateTime<Utc>>,
+    detail: Option<bool>,
+) -> Result<ServerCostForAll, UnexpectedOnlyError> {
+    todo!()
+}
+
+#[derive(Serialize)]
+#[serde(untagged)]
+pub enum ServerCost {
+    Server(ServerCostForServer),
+    User(ServerCostForUser),
+    Project(ServerCostForProject),
+    All(ServerCostForAll),
+}
+
 #[tracing::instrument(name = "server_consumption")]
 pub async fn server_cost(
     user: ReqData<User>,
@@ -14,5 +97,78 @@ pub async fn server_cost(
     params: Query<ServerCostParams>,
     // TODO: is the ValidationError variant ever used?
 ) -> Result<HttpResponse, OptionApiError> {
-    todo!()
+    // TODO: add proper permission check
+    require_admin_user(&user)?;
+    let end = params.end.unwrap_or(Utc::now().fixed_offset());
+    let begin = params.begin.unwrap_or(
+        Utc.with_ymd_and_hms(Utc::now().year(), 1, 1, 1, 0, 0)
+            .unwrap()
+            .fixed_offset(),
+    );
+    let mut transaction = db_pool
+        .begin()
+        .await
+        .context("Failed to begin transaction")?;
+    let cost = if params.all.unwrap_or(false) {
+        ServerCost::All(
+            calculate_server_cost_for_all(
+                &mut transaction,
+                Some(begin.into()),
+                Some(end.into()),
+                params.detail,
+            )
+            .await?,
+        )
+    } else if let Some(project_id) = params.project {
+        ServerCost::Project(
+            calculate_server_cost_for_project(
+                &mut transaction,
+                project_id as u64,
+                Some(begin.into()),
+                Some(end.into()),
+                params.detail,
+            )
+            .await?,
+        )
+    } else if let Some(user_id) = params.user {
+        ServerCost::User(
+            calculate_server_cost_for_user(
+                &mut transaction,
+                user_id as u64,
+                Some(begin.into()),
+                Some(end.into()),
+                params.detail,
+            )
+            .await?,
+        )
+    } else if let Some(server_id) = params.server.clone() {
+        ServerCost::Server(
+            calculate_server_cost_for_server(
+                &mut transaction,
+                server_id.as_str(),
+                Some(begin.into()),
+                Some(end.into()),
+                None,
+            )
+            .await?,
+        )
+    } else {
+        ServerCost::User(
+            calculate_server_cost_for_user(
+                &mut transaction,
+                user.id as u64,
+                Some(begin.into()),
+                Some(end.into()),
+                params.detail,
+            )
+            .await?,
+        )
+    };
+    transaction
+        .commit()
+        .await
+        .context("Failed to commit transaction")?;
+    Ok(HttpResponse::Ok()
+        .content_type("application/json")
+        .json(cost))
 }