diff --git a/Cargo.lock b/Cargo.lock
index 1ff71a3..c452700 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -888,6 +888,7 @@ checksum = "23342abe12aba583913b2e62f22225ff9c950774065e4bfb61a19cd9770fec40"
 dependencies = [
  "futures-channel",
  "futures-core",
+ "futures-executor",
  "futures-io",
  "futures-sink",
  "futures-task",
@@ -1455,6 +1456,7 @@ dependencies = [
  "compact_str",
  "dotenvy",
  "either",
+ "futures",
  "futures-util",
  "headers",
  "hyper",
@@ -1590,6 +1592,7 @@ dependencies = [
  "magnetar_sdk_macros",
  "serde",
  "serde_json",
+ "serde_urlencoded",
  "ts-rs",
  "unicode-segmentation",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index f13447f..e3d0596 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,6 +32,7 @@ compact_str = "0.7"
 dotenvy = "0.15"
 either = "1.9"
 emojis = "0.6"
+futures = "0.3"
 futures-core = "0.3"
 futures-util = "0.3"
 headers = "0.3"
@@ -53,6 +54,7 @@ sea-orm = "0.12"
 sea-orm-migration = "0.12"
 serde = "1"
 serde_json = "1"
+serde_urlencoded = "0.7"
 strum = "0.25"
 tera = { version = "1", default-features = false }
 thiserror = "1"
@@ -101,6 +103,7 @@ cfg-if = { workspace = true }
 
 compact_str = { workspace = true }
 either = { workspace = true }
+futures = { workspace = true }
 futures-util = { workspace = true }
 itertools = { workspace = true }
 lazy_static = { workspace = true }
diff --git a/ext_calckey_model/src/lib.rs b/ext_calckey_model/src/lib.rs
index 573c749..da54175 100644
--- a/ext_calckey_model/src/lib.rs
+++ b/ext_calckey_model/src/lib.rs
@@ -114,6 +114,16 @@ impl CalckeyModel {
             .await?)
     }
 
+    pub async fn get_many_users_by_id(
+        &self,
+        id: &[String],
+    ) -> Result<Vec<user::Model>, CalckeyDbError> {
+        Ok(user::Entity::find()
+            .filter(user::Column::Id.is_in(id))
+            .all(&self.0)
+            .await?)
+    }
+
     pub async fn get_user_by_token(
         &self,
         token: &str,
diff --git a/fe_calckey/frontend/client/src/components/MkAvatars.vue b/fe_calckey/frontend/client/src/components/MagAvatars.vue
similarity index 56%
rename from fe_calckey/frontend/client/src/components/MkAvatars.vue
rename to fe_calckey/frontend/client/src/components/MagAvatars.vue
index 9928de9..ab5b42a 100644
--- a/fe_calckey/frontend/client/src/components/MkAvatars.vue
+++ b/fe_calckey/frontend/client/src/components/MagAvatars.vue
@@ -9,25 +9,37 @@
 <script lang="ts" setup>
 import { onMounted, ref, watch } from "vue";
 import * as os from "@/os";
-import { User } from "calckey-js/built/entities";
+import { packed, endpoints } from "magnetar-common";
 
 const props = defineProps<{
     userIds: string[];
 }>();
 
-const users = ref<User[]>([]);
+const users = ref<packed.PackUserBase[]>([]);
 
 onMounted(async () => {
-    users.value = await os.api("users/show", {
-        userIds: props.userIds,
-    });
+    users.value = await os
+        .magApi(
+            endpoints.GetManyUsersById,
+            {
+                id: props.userIds,
+            },
+            {}
+        )
+        .then((p) => p.filter((u) => u !== null).map((u) => u!));
 
     watch(
         () => props.userIds,
         async (userIds) => {
-            users.value = await os.api("users/show", {
-                userIds,
-            });
+            users.value = await os
+                .magApi(
+                    endpoints.GetManyUsersById,
+                    {
+                        id: userIds,
+                    },
+                    {}
+                )
+                .then((p) => p.filter((u) => u !== null).map((u) => u!));
         }
     );
 });
diff --git a/fe_calckey/frontend/client/src/components/global/MkAvatar.vue b/fe_calckey/frontend/client/src/components/global/MkAvatar.vue
index 63d1ebc..6011186 100644
--- a/fe_calckey/frontend/client/src/components/global/MkAvatar.vue
+++ b/fe_calckey/frontend/client/src/components/global/MkAvatar.vue
@@ -83,7 +83,7 @@ function onClick(ev: MouseEvent) {
     emit("click", ev);
 }
 
-let color = $ref();
+let color = $ref<string>();
 
 watch(
     () => magTransProperty(props.user, "avatar_blurhash", "avatarBlurhash"),
diff --git a/fe_calckey/frontend/client/src/pages/my-groups/index.vue b/fe_calckey/frontend/client/src/pages/my-groups/index.vue
index a6d4534..ccbbae5 100644
--- a/fe_calckey/frontend/client/src/pages/my-groups/index.vue
+++ b/fe_calckey/frontend/client/src/pages/my-groups/index.vue
@@ -23,7 +23,7 @@
                         }}</MkA>
                     </div>
                     <div class="_content">
-                        <MkAvatars :user-ids="group.userIds" />
+                        <MagAvatars :user-ids="group.userIds" />
                     </div>
                 </div>
             </MkPagination>
@@ -35,7 +35,7 @@
                 <div v-for="group in items" :key="group.id" class="_card">
                     <div class="_title">{{ group.name }}</div>
                     <div class="_content">
-                        <MkAvatars :user-ids="group.userIds" />
+                        <MagAvatars :user-ids="group.userIds" />
                     </div>
                     <div class="_footer">
                         <MkButton danger @click="leave(group)">{{
@@ -52,7 +52,7 @@
 import { computed, ref } from "vue";
 import MkPagination from "@/components/MkPagination.vue";
 import MkButton from "@/components/MkButton.vue";
-import MkAvatars from "@/components/MkAvatars.vue";
+import MagAvatars from "@/components/MagAvatars.vue";
 import * as os from "@/os";
 import { definePageMetadata } from "@/scripts/page-metadata";
 import { i18n } from "@/i18n";
diff --git a/fe_calckey/frontend/client/src/pages/my-lists/index.vue b/fe_calckey/frontend/client/src/pages/my-lists/index.vue
index 396e026..e0b573f 100644
--- a/fe_calckey/frontend/client/src/pages/my-lists/index.vue
+++ b/fe_calckey/frontend/client/src/pages/my-lists/index.vue
@@ -29,7 +29,7 @@
                         :to="`/my/lists/${list.id}`"
                     >
                         <div class="name">{{ list.name }}</div>
-                        <MkAvatars :user-ids="list.userIds" />
+                        <MagAvatars :user-ids="list.userIds" />
                     </MkA>
                     <MkButton @click="deleteAll"
                         ><i class="ph-trash ph-bold ph-lg"></i>
@@ -45,7 +45,7 @@
 import {} from "vue";
 import MkPagination from "@/components/MkPagination.vue";
 import MkButton from "@/components/MkButton.vue";
-import MkAvatars from "@/components/MkAvatars.vue";
+import MagAvatars from "@/components/MagAvatars.vue";
 import MkInfo from "@/components/MkInfo.vue";
 import * as os from "@/os";
 import { i18n } from "@/i18n";
diff --git a/fe_calckey/frontend/client/src/ui/deck/bookmarks-column.vue b/fe_calckey/frontend/client/src/ui/deck/bookmarks-column.vue
index 771f76e..b495111 100644
--- a/fe_calckey/frontend/client/src/ui/deck/bookmarks-column.vue
+++ b/fe_calckey/frontend/client/src/ui/deck/bookmarks-column.vue
@@ -10,7 +10,7 @@
             ><span style="margin-left: 8px">{{ column.name }}</span>
         </template>
 
-        <MkAvatars :userIds="userList" />
+        <MagAvatars :userIds="userList" />
     </XColumn>
 </template>
 
@@ -21,7 +21,7 @@ import * as os from "@/os";
 import { i18n } from "@/i18n";
 import { onMounted, ref, watch } from "vue";
 import { User } from "calckey-js/built/entities";
-import MkAvatars from "@/components/MkAvatars.vue";
+import MagAvatars from "@/components/MagAvatars.vue";
 
 const props = defineProps<{
     column: Column;
diff --git a/fe_calckey/frontend/client/src/widgets/user-list.vue b/fe_calckey/frontend/client/src/widgets/user-list.vue
index ab37471..dbf1fa5 100644
--- a/fe_calckey/frontend/client/src/widgets/user-list.vue
+++ b/fe_calckey/frontend/client/src/widgets/user-list.vue
@@ -21,7 +21,7 @@
             </div>
             <MkLoading v-else-if="fetching" />
             <div v-else class="users">
-                <MkAvatars :user-ids="users" class="userAvatars" />
+                <MagAvatars :user-ids="users" class="userAvatars" />
             </div>
         </div>
     </MkContainer>
@@ -31,7 +31,7 @@
 import { useWidgetPropsManager, Widget, WidgetComponentExpose } from "./widget";
 import { GetFormResultType } from "@/scripts/form";
 import MkContainer from "@/components/MkContainer.vue";
-import MkAvatars from "@/components/MkAvatars.vue";
+import MagAvatars from "@/components/MagAvatars.vue";
 import * as os from "@/os";
 import { useInterval } from "@/scripts/use-interval";
 import { i18n } from "@/i18n";
diff --git a/fe_calckey/frontend/magnetar-common/src/be-api.ts b/fe_calckey/frontend/magnetar-common/src/be-api.ts
index fc0dafc..082240e 100644
--- a/fe_calckey/frontend/magnetar-common/src/be-api.ts
+++ b/fe_calckey/frontend/magnetar-common/src/be-api.ts
@@ -20,7 +20,7 @@ function nestedUrlSearchParams(data: any, topLevel: boolean = true): string {
         case "boolean":
         case "number":
         case "symbol":
-            if (topLevel) return encodeURIComponent(data.toString()) + "=";
+            if (topLevel) return encodeURIComponent(data.toString());
 
             return data.toString();
         case "object":
diff --git a/fe_calckey/frontend/magnetar-common/src/endpoints.ts b/fe_calckey/frontend/magnetar-common/src/endpoints.ts
index 6528afd..7438ad3 100644
--- a/fe_calckey/frontend/magnetar-common/src/endpoints.ts
+++ b/fe_calckey/frontend/magnetar-common/src/endpoints.ts
@@ -3,3 +3,4 @@ export { GetTimeline } from "./types/endpoints/GetTimeline";
 export { GetUserById } from "./types/endpoints/GetUserById";
 export { GetUserByAcct } from "./types/endpoints/GetUserByAcct";
 export { GetUserSelf } from "./types/endpoints/GetUserSelf";
+export { GetManyUsersById } from "./types/endpoints/GetManyUsersById";
diff --git a/fe_calckey/frontend/magnetar-common/src/types/ManyUsersByIdReq.ts b/fe_calckey/frontend/magnetar-common/src/types/ManyUsersByIdReq.ts
new file mode 100644
index 0000000..6e9b864
--- /dev/null
+++ b/fe_calckey/frontend/magnetar-common/src/types/ManyUsersByIdReq.ts
@@ -0,0 +1,3 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+
+export interface ManyUsersByIdReq { id: Array<string>, }
\ No newline at end of file
diff --git a/fe_calckey/frontend/magnetar-common/src/types/endpoints/GetManyUsersById.ts b/fe_calckey/frontend/magnetar-common/src/types/endpoints/GetManyUsersById.ts
new file mode 100644
index 0000000..20f6507
--- /dev/null
+++ b/fe_calckey/frontend/magnetar-common/src/types/endpoints/GetManyUsersById.ts
@@ -0,0 +1,12 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { ManyUsersByIdReq } from "../ManyUsersByIdReq";
+import type { PackUserBase } from "../packed/PackUserBase";
+
+export const GetManyUsersById = {
+    endpoint: "/users/lookup-many",
+    pathParams: [] as [],
+    method: "GET" as "GET" | "POST" | "PUT" | "DELETE" | "PATCH",
+    request: undefined as unknown as ManyUsersByIdReq,
+    response: undefined as unknown as Array<PackUserBase | null>
+}
+                    
\ No newline at end of file
diff --git a/magnetar_sdk/Cargo.toml b/magnetar_sdk/Cargo.toml
index 03a89d4..5a27d25 100644
--- a/magnetar_sdk/Cargo.toml
+++ b/magnetar_sdk/Cargo.toml
@@ -13,6 +13,7 @@ chrono = { workspace = true, features = ["serde"] }
 http = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }
+serde_urlencoded = { workspace = true }
 
 ts-rs = { workspace = true, features = ["chrono", "chrono-impl"] }
 
diff --git a/magnetar_sdk/macros/src/lib.rs b/magnetar_sdk/macros/src/lib.rs
index a323b44..4089e71 100644
--- a/magnetar_sdk/macros/src/lib.rs
+++ b/magnetar_sdk/macros/src/lib.rs
@@ -4,7 +4,8 @@ use std::collections::HashSet;
 use syn::parse::Parse;
 use syn::punctuated::Punctuated;
 use syn::{
-    Expr, ExprLit, ExprPath, Ident, Lit, Meta, MetaNameValue, PathArguments, Token, Type, TypePath,
+    Expr, ExprLit, ExprPath, GenericArgument, Ident, Lit, Meta, MetaNameValue, PathArguments,
+    Token, Type, TypePath,
 };
 
 struct Field {
@@ -311,14 +312,52 @@ pub fn derive_endpoint(item: TokenStream) -> TokenStream {
         }
     };
 
+    let req_args_flat = request_args.clone().unwrap_or_default();
+    let mut res_args_flat = response_args.clone().unwrap_or_default();
+
     let call_name_res = if let Some(ref args) = response_args {
-        let args_str = args
+        let args_nested = args
             .iter()
-            .map(|a| a.into_token_stream().to_string())
+            .map(|a| {
+                let normal = Vec::new();
+
+                let GenericArgument::Type(inner) = a else {
+                    return normal;
+                };
+                let Type::Path(path_inner) = inner else {
+                    return normal;
+                };
+                let Some(seg) = path_inner.path.segments.last() else {
+                    return normal;
+                };
+                let PathArguments::AngleBracketed(angle_inner) = &seg.arguments else {
+                    return normal;
+                };
+                angle_inner.args.iter().cloned().collect::<Vec<_>>()
+            })
+            .collect::<Vec<_>>();
+
+        res_args_flat.extend(args_nested.iter().flatten().cloned());
+
+        let arg_tokens_nested = args_nested
+            .iter()
+            .zip(args)
+            .map(|(args, parent)| {
+                if !args.is_empty() {
+                    let names = args.iter().map(|a| a.to_token_stream().to_string());
+                    quote::quote! {
+                        <#parent as TS>::name_with_type_args(vec![#( #names.to_string() ),*])
+                    }
+                } else {
+                    quote::quote! {
+                        <#parent as TS>::name()
+                    }
+                }
+            })
             .collect::<Vec<_>>();
 
         quote::quote! {
-            <#struct_name as Endpoint>::Response::name_with_type_args(vec![#( #args_str.to_string() ),*])
+            <#struct_name as Endpoint>::Response::name_with_type_args(vec![#( #arg_tokens_nested ),*])
         }
     } else {
         quote::quote! {
@@ -326,9 +365,6 @@ pub fn derive_endpoint(item: TokenStream) -> TokenStream {
         }
     };
 
-    let req_args_flat = request_args.unwrap_or_default();
-    let res_args_flat = response_args.unwrap_or_default();
-
     let expanded = quote::quote! {
         impl Default for #struct_name {
             fn default() -> Self {
diff --git a/magnetar_sdk/src/endpoints/user.rs b/magnetar_sdk/src/endpoints/user.rs
index 436715f..e6db1cf 100644
--- a/magnetar_sdk/src/endpoints/user.rs
+++ b/magnetar_sdk/src/endpoints/user.rs
@@ -1,10 +1,11 @@
 use crate::endpoints::Endpoint;
+use crate::util_types::deserialize_array_urlenc;
 use http::Method;
 use magnetar_sdk_macros::Endpoint;
 use serde::{Deserialize, Serialize};
 use ts_rs::TS;
 
-use crate::types::user::{PackUserMaybeAll, PackUserSelfMaybeAll};
+use crate::types::user::{PackUserBase, PackUserMaybeAll, PackUserSelfMaybeAll};
 
 // Get self
 #[derive(Serialize, Deserialize, TS)]
@@ -54,6 +55,23 @@ pub struct UserByIdReq {
 )]
 pub struct GetUserById;
 
+// Get many users by an ID array
+#[derive(Serialize, Deserialize, TS)]
+#[ts(export)]
+pub struct ManyUsersByIdReq {
+    #[serde(deserialize_with = "deserialize_array_urlenc")]
+    pub id: Vec<String>,
+}
+
+#[derive(Endpoint)]
+#[endpoint(
+    endpoint = "/users/lookup-many",
+    method = Method::GET,
+    request = "ManyUsersByIdReq",
+    response = "Vec<Option<PackUserBase>>"
+)]
+pub struct GetManyUsersById;
+
 // Get user by fedi tag
 
 #[derive(Endpoint)]
diff --git a/magnetar_sdk/src/util_types.rs b/magnetar_sdk/src/util_types.rs
index d8547a1..d8241e4 100644
--- a/magnetar_sdk/src/util_types.rs
+++ b/magnetar_sdk/src/util_types.rs
@@ -1,4 +1,7 @@
-use serde::Serialize;
+use serde::de::DeserializeOwned;
+use serde::{Deserialize, Deserializer, Serialize};
+use std::collections::HashMap;
+use std::hash::Hash;
 use ts_rs::TS;
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
@@ -76,3 +79,20 @@ impl<const MIN: u64, const MAX: u64> TryFrom<u64> for U64Range<MIN, MAX> {
         Ok(U64Range(value))
     }
 }
+
+pub(crate) fn deserialize_array_urlenc<'de, D, T: Eq + Hash>(
+    deserializer: D,
+) -> Result<Vec<T>, D::Error>
+where
+    D: Deserializer<'de>,
+    T: DeserializeOwned,
+{
+    let str_raw = String::deserialize(deserializer)?;
+    let parts = serde_urlencoded::from_str::<Vec<(T, String)>>(&str_raw)
+        .map_err(serde::de::Error::custom)?
+        .into_iter()
+        .map(|(k, _)| k)
+        .collect::<Vec<_>>();
+
+    Ok(parts)
+}
diff --git a/src/api_v1/mod.rs b/src/api_v1/mod.rs
index 1c188cd..7e8bbe2 100644
--- a/src/api_v1/mod.rs
+++ b/src/api_v1/mod.rs
@@ -2,19 +2,24 @@ mod note;
 mod user;
 
 use crate::api_v1::note::handle_note;
-use crate::api_v1::user::{handle_user_info, handle_user_info_by_acct, handle_user_info_self};
+use crate::api_v1::user::{
+    handle_user_by_id_many, handle_user_info, handle_user_info_by_acct, handle_user_info_self,
+};
 use crate::service::MagnetarService;
 use crate::web::auth;
 use crate::web::auth::AuthState;
 use axum::middleware::from_fn_with_state;
 use axum::routing::get;
 use axum::Router;
+use serde::de::{DeserializeOwned, Error};
+use serde::{Deserialize, Deserializer};
 use std::sync::Arc;
 
 pub fn create_api_router(service: Arc<MagnetarService>) -> Router {
     Router::new()
         .route("/users/@self", get(handle_user_info_self))
         .route("/users/by-acct/:id", get(handle_user_info_by_acct))
+        .route("/users/lookup-many", get(handle_user_by_id_many))
         .route("/users/:id", get(handle_user_info))
         .route("/notes/:id", get(handle_note))
         .layer(from_fn_with_state(
diff --git a/src/api_v1/user.rs b/src/api_v1/user.rs
index 8ffcab0..a98a89a 100644
--- a/src/api_v1/user.rs
+++ b/src/api_v1/user.rs
@@ -1,16 +1,23 @@
 use crate::model::processing::user::UserModel;
+use crate::model::processing::PackError;
 use crate::model::PackingContext;
 use crate::service::MagnetarService;
 use crate::web::auth::{AuthenticatedUser, MaybeUser};
-use crate::web::{ApiError, ObjectNotFound};
+use crate::web::{ApiError, ArgumentOutOfRange, ObjectNotFound};
 use axum::extract::{Path, Query, State};
 use axum::Json;
+use futures::StreamExt;
+use futures_util::TryStreamExt;
+use itertools::Itertools;
 use magnetar_common::util::lenient_parse_tag;
 use magnetar_sdk::endpoints::user::{
-    GetUserByAcct, GetUserById, GetUserSelf, UserByIdReq, UserSelfReq,
+    GetManyUsersById, GetUserByAcct, GetUserById, GetUserSelf, ManyUsersByIdReq, UserByIdReq,
+    UserSelfReq,
 };
 use magnetar_sdk::endpoints::{Req, Res};
+use std::collections::HashMap;
 use std::sync::Arc;
+
 pub async fn handle_user_info_self(
     Query(UserSelfReq {
         detail: _,
@@ -82,3 +89,42 @@ pub async fn handle_user_info_by_acct(
     let user = UserModel.base_from_existing(&ctx, &user_model).await?;
     Ok(Json(user.into()))
 }
+
+pub async fn handle_user_by_id_many(
+    Query(ManyUsersByIdReq { id }): Query<Req<GetManyUsersById>>,
+    State(service): State<Arc<MagnetarService>>,
+    MaybeUser(user): MaybeUser,
+) -> Result<Json<Res<GetManyUsersById>>, ApiError> {
+    if id.len() >= 100 {
+        return Err(ArgumentOutOfRange(stringify!(id).to_string()).into());
+    }
+
+    let users = service
+        .db
+        .get_many_users_by_id(&id.iter().cloned().sorted().dedup().collect::<Vec<_>>())
+        .await?;
+
+    let ctx = PackingContext::new(service, user.clone()).await?;
+    let user_model = UserModel;
+
+    let futures = users
+        .iter()
+        .map(|u| user_model.base_from_existing(&ctx, u))
+        .collect::<Vec<_>>();
+
+    let users_proc = futures::stream::iter(futures)
+        .buffered(20)
+        .err_into::<PackError>()
+        .try_collect::<Vec<_>>()
+        .await?
+        .into_iter()
+        .map(|u| (u.id.0.id.clone(), u))
+        .collect::<HashMap<_, _>>();
+
+    let users_ordered = id
+        .iter()
+        .map(|ident| users_proc.get(ident).cloned())
+        .collect::<Vec<_>>();
+
+    Ok(Json(users_ordered))
+}
diff --git a/src/model/processing/mod.rs b/src/model/processing/mod.rs
index e678d80..42e8db7 100644
--- a/src/model/processing/mod.rs
+++ b/src/model/processing/mod.rs
@@ -30,6 +30,8 @@ pub enum PackError {
     DeserializerError(#[from] serde_json::Error),
     #[error("URL parse error: {0}")]
     UrlParseError(#[from] url::ParseError),
+    #[error("Parallel processing error: {0}")]
+    JoinError(#[from] tokio::task::JoinError),
 }
 
 pub type PackResult<T> = Result<T, PackError>;
diff --git a/src/web/mod.rs b/src/web/mod.rs
index cdac80f..37a1acf 100644
--- a/src/web/mod.rs
+++ b/src/web/mod.rs
@@ -134,3 +134,22 @@ impl From<ObjectNotFound> for ApiError {
         }
     }
 }
+
+#[derive(Debug)]
+pub struct ArgumentOutOfRange(pub String);
+
+impl From<&ArgumentOutOfRange> for &str {
+    fn from(_: &ArgumentOutOfRange) -> Self {
+        "ArgumentOutOfRange"
+    }
+}
+
+impl From<ArgumentOutOfRange> for ApiError {
+    fn from(err: ArgumentOutOfRange) -> Self {
+        Self {
+            status: StatusCode::BAD_REQUEST,
+            code: err.error_code(),
+            message: format!("Argument out of range: {}", err.0),
+        }
+    }
+}