diff --git a/server/src/external/mongo/indexes.ts b/server/src/external/mongo/indexes.ts
index c3717106a..49d715f17 100644
--- a/server/src/external/mongo/indexes.ts
+++ b/server/src/external/mongo/indexes.ts
@@ -54,6 +54,7 @@ const staticIndexes: Partial<Record<Databases, Index[]>> = {
 	],
 	users: [
 		index({ id: 1 }, UNIQUE),
+		index({ id: 1, authLevel: 1 }, UNIQUE),
 		index({ username: 1 }, UNIQUE),
 		index({ usernameLowercase: 1 }, UNIQUE),
 	],
diff --git a/server/src/server/middleware/auth.test.ts b/server/src/server/middleware/auth.test.ts
index 30313e60f..910d93b85 100644
--- a/server/src/server/middleware/auth.test.ts
+++ b/server/src/server/middleware/auth.test.ts
@@ -2,6 +2,7 @@ import expMiddlewareMock from "express-request-mock";
 import db from "external/mongo/db";
 import { SYMBOL_TachiAPIAuth } from "lib/constants/tachi";
 import t from "tap";
+import mockApi from "test-utils/mock-api";
 import ResetDBState from "test-utils/resets";
 import { AllPermissions, SetRequestPermissions } from "./auth";
 
@@ -119,3 +120,27 @@ t.test("#SetRequestPermissions", (t) => {
 
 	t.end();
 });
+
+t.test("#RejectIfBanned", (t) => {
+	t.test("Should stop banned users from doing anything.", async (t) => {
+		await db.users.update({ id: 1 }, { $set: { authLevel: 0 } });
+
+		await db["api-tokens"].insert({
+			userID: 1,
+			identifier: "Mock API Token",
+			permissions: {
+				customise_profile: true,
+			},
+			token: "mock_token",
+			fromAPIClient: null,
+		});
+
+		const res = await mockApi.get("/api/v1/status").set("Authorization", "Bearer mock_token");
+
+		t.equal(res.statusCode, 403, "Should return 403 on benign endpoints.");
+
+		t.end();
+	});
+
+	t.end();
+});
diff --git a/server/src/server/middleware/auth.ts b/server/src/server/middleware/auth.ts
index 7f82cbb0c..d3bc0f4aa 100644
--- a/server/src/server/middleware/auth.ts
+++ b/server/src/server/middleware/auth.ts
@@ -2,8 +2,9 @@ import { RequestHandler } from "express";
 import db from "external/mongo/db";
 import { SYMBOL_TachiAPIAuth } from "lib/constants/tachi";
 import { SplitAuthorizationHeader } from "utils/misc";
-import { APITokenDocument, APIPermissions } from "tachi-common";
+import { APITokenDocument, APIPermissions, UserAuthLevels } from "tachi-common";
 import CreateLogCtx from "lib/logger/logger";
+import { TachiConfig } from "lib/setup/config";
 
 const logger = CreateLogCtx(__filename);
 
@@ -186,3 +187,21 @@ const CreateRequireNotGuest =
 export const RequireNotGuest: RequestHandler = CreateRequireNotGuest("description");
 
 export const FervidexStyleRequireNotGuest: RequestHandler = CreateRequireNotGuest("error");
+
+export const RejectIfBanned: RequestHandler = async (req, res, next) => {
+	if (req[SYMBOL_TachiAPIAuth].userID) {
+		const isBanned = await db.users.findOne({
+			id: req[SYMBOL_TachiAPIAuth].userID!,
+			authLevel: UserAuthLevels.BANNED,
+		});
+
+		if (isBanned) {
+			return res.status(403).json({
+				success: false,
+				description: `You are banned from ${TachiConfig.NAME}`,
+			});
+		}
+	}
+
+	next();
+};
diff --git a/server/src/server/middleware/request-logger.ts b/server/src/server/middleware/request-logger.ts
index 6800a7883..657bf4ea5 100644
--- a/server/src/server/middleware/request-logger.ts
+++ b/server/src/server/middleware/request-logger.ts
@@ -1,6 +1,7 @@
 import CreateLogCtx from "lib/logger/logger";
 import { RequestHandler, Response } from "express-serve-static-core";
 import { SYMBOL_TachiAPIAuth } from "lib/constants/tachi";
+import { TachiConfig } from "lib/setup/config";
 
 const logger = CreateLogCtx(__filename);
 
@@ -60,6 +61,10 @@ export const RequestLoggerMiddleware: RequestHandler = (req, res, next) => {
 			return;
 		}
 
+		if (contents.body?.description === `You are banned from ${TachiConfig.NAME}.`) {
+			return;
+		}
+
 		if (res.statusCode < 400 || res.statusCode === 404) {
 			logger.verbose(
 				`(${req.method} ${req.originalUrl}) Returned ${res.statusCode}.`,
diff --git a/server/src/server/router/router.ts b/server/src/server/router/router.ts
index 10088693c..c9c6d04d4 100644
--- a/server/src/server/router/router.ts
+++ b/server/src/server/router/router.ts
@@ -1,6 +1,6 @@
 import { Router } from "express";
 import { UpdateLastSeen } from "server/middleware/update-last-seen";
-import { SetRequestPermissions } from "../middleware/auth";
+import { RejectIfBanned, SetRequestPermissions } from "../middleware/auth";
 import { NormalRateLimitMiddleware } from "../middleware/rate-limiter";
 import apiRouterV1 from "./api/v1/router";
 import irRouter from "./ir/router";
@@ -13,6 +13,7 @@ router.use("/ir", NormalRateLimitMiddleware, irRouter);
 // but also may require custom authentication.
 router.use(SetRequestPermissions);
 router.use(UpdateLastSeen);
+router.use(RejectIfBanned);
 
 router.use("/api/v1", apiRouterV1);
 
diff --git a/server/src/server/server.ts b/server/src/server/server.ts
index 4f62cd32d..f951a45a2 100644
--- a/server/src/server/server.ts
+++ b/server/src/server/server.ts
@@ -8,6 +8,7 @@ import { SYMBOL_TachiAPIAuth } from "lib/constants/tachi";
 import CreateLogCtx from "lib/logger/logger";
 import { Environment, ServerConfig, TachiConfig } from "lib/setup/config";
 import { integer } from "tachi-common";
+import { RejectIfBanned } from "./middleware/auth";
 import { RequestLoggerMiddleware } from "./middleware/request-logger";
 import mainRouter from "./router/router";
 
@@ -96,6 +97,8 @@ process.on("unhandledRejection", (reason, promise) => {
 app.use(express.json({ limit: "4mb" }));
 
 app.use((req, res, next) => {
+	// Always mount an empty req body. We operate under the assumption that req.body is
+	// always defined.
 	if (req.method !== "GET" && !req.body) {
 		req.body = {};
 	}