diff --git a/src/middlewares/co-creator-permission.middleware.test.ts b/src/middlewares/co-creator-permission.middleware.test.ts
new file mode 100644
index 00000000..f99f1d6d
--- /dev/null
+++ b/src/middlewares/co-creator-permission.middleware.test.ts
@@ -0,0 +1,204 @@
+// src/middlewares/co-creator-permission.middleware.test.ts
+
+import { requireCoCreatorPermission } from './co-creator-permission.middleware';
+import * as coCreatorService from '../modules/co-creators/co-creators.service';
+import * as walletOwnershipUtils from '../utils/wallet-ownership.utils';
+
+jest.mock('../modules/co-creators/co-creators.service', () => ({
+   getCoCreatorDetail: jest.fn(),
+}));
+
+jest.mock('../utils/wallet-ownership.utils', () => ({
+   checkCreatorProfileOwnership: jest.fn(),
+}));
+
+describe('requireCoCreatorPermission Middleware (#1156)', () => {
+   let req: any;
+   let res: any;
+   let next: jest.Mock;
+
+   beforeEach(() => {
+      jest.clearAllMocks();
+      req = {
+         params: { keyId: 'key-1' },
+         headers: { 'x-wallet-address': 'GCOCREATORWALLET11111111111111111111111111111111' },
+         path: '/api/v1/keys/key-1/settings',
+      };
+      res = {
+         status: jest.fn().mockReturnThis(),
+         json: jest.fn().mockReturnThis(),
+         setHeader: jest.fn().mockReturnThis(),
+      };
+      next = jest.fn();
+   });
+
+   it('returns 401 when wallet address is missing', async () => {
+      req.headers = {};
+      const middleware = requireCoCreatorPermission();
+      await middleware(req, res, next);
+
+      expect(res.status).toHaveBeenCalledWith(401);
+      expect(next).not.toHaveBeenCalled();
+   });
+
+   it('returns 400 when keyId parameter is missing', async () => {
+      req.params = {};
+      const middleware = requireCoCreatorPermission();
+      await middleware(req, res, next);
+
+      expect(res.status).toHaveBeenCalledWith(400);
+      expect(next).not.toHaveBeenCalled();
+   });
+
+   it('bypasses co-creator check when wallet is the primary creator', async () => {
+      jest
+        .spyOn(walletOwnershipUtils, 'checkCreatorProfileOwnership')
+        .mockResolvedValueOnce({ status: 'granted', ownerUserId: 'user-1' });
+
+      const middleware = requireCoCreatorPermission();
+      await middleware(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(res.status).not.toHaveBeenCalled();
+   });
+
+   it('ADMIN role passes all creator-action endpoints correctly', async () => {
+      jest
+        .spyOn(walletOwnershipUtils, 'checkCreatorProfileOwnership')
+        .mockResolvedValueOnce({ status: 'forbidden', address: 'a', ownerUserId: 'user-2' });
+      jest
+        .spyOn(coCreatorService, 'getCoCreatorDetail')
+        .mockResolvedValueOnce({
+           key_id: 'key-1',
+           wallet: 'GCOCREATORWALLET11111111111111111111111111111111',
+           role: 'ADMIN',
+           active: true,
+           added_at: new Date().toISOString(),
+           removed_at: null,
+           share_bps: null,
+        });
+
+      req.path = '/api/v1/keys/key-1/revenue';
+      const middleware = requireCoCreatorPermission();
+      await middleware(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(res.status).not.toHaveBeenCalled();
+   });
+
+   it('CONTENT role passes announcement endpoints correctly', async () => {
+      jest
+        .spyOn(walletOwnershipUtils, 'checkCreatorProfileOwnership')
+        .mockResolvedValueOnce({ status: 'forbidden', address: 'a', ownerUserId: 'user-2' });
+      jest
+        .spyOn(coCreatorService, 'getCoCreatorDetail')
+        .mockResolvedValueOnce({
+           key_id: 'key-1',
+           wallet: 'GCOCREATORWALLET11111111111111111111111111111111',
+           role: 'CONTENT',
+           active: true,
+           added_at: new Date().toISOString(),
+           removed_at: null,
+           share_bps: null,
+        });
+
+      req.path = '/api/v1/keys/key-1/announcements';
+      const middleware = requireCoCreatorPermission();
+      await middleware(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(res.status).not.toHaveBeenCalled();
+   });
+
+   it('CONTENT role is blocked correctly on non-announcement endpoints with 403, role_required, and current_role', async () => {
+      jest
+        .spyOn(walletOwnershipUtils, 'checkCreatorProfileOwnership')
+        .mockResolvedValueOnce({ status: 'forbidden', address: 'a', ownerUserId: 'user-2' });
+      jest
+        .spyOn(coCreatorService, 'getCoCreatorDetail')
+        .mockResolvedValueOnce({
+           key_id: 'key-1',
+           wallet: 'GCOCREATORWALLET11111111111111111111111111111111',
+           role: 'CONTENT',
+           active: true,
+           added_at: new Date().toISOString(),
+           removed_at: null,
+           share_bps: null,
+        });
+
+      req.path = '/api/v1/keys/key-1/revenue';
+      const middleware = requireCoCreatorPermission();
+      await middleware(req, res, next);
+
+      expect(next).not.toHaveBeenCalled();
+      expect(res.status).toHaveBeenCalledWith(403);
+      expect(res.json).toHaveBeenCalledWith(
+         expect.objectContaining({
+            success: false,
+            error: expect.objectContaining({
+               code: 'FORBIDDEN',
+               role_required: 'REVENUE',
+               current_role: 'CONTENT',
+            }),
+         })
+      );
+   });
+
+   it('REVENUE role passes revenue endpoints correctly', async () => {
+      jest
+        .spyOn(walletOwnershipUtils, 'checkCreatorProfileOwnership')
+        .mockResolvedValueOnce({ status: 'forbidden', address: 'a', ownerUserId: 'user-2' });
+      jest
+        .spyOn(coCreatorService, 'getCoCreatorDetail')
+        .mockResolvedValueOnce({
+           key_id: 'key-1',
+           wallet: 'GCOCREATORWALLET11111111111111111111111111111111',
+           role: 'REVENUE',
+           active: true,
+           added_at: new Date().toISOString(),
+           removed_at: null,
+           share_bps: 500,
+        });
+
+      req.path = '/api/v1/keys/key-1/revenue';
+      const middleware = requireCoCreatorPermission();
+      await middleware(req, res, next);
+
+      expect(next).toHaveBeenCalledTimes(1);
+      expect(res.status).not.toHaveBeenCalled();
+   });
+
+   it('REVENUE role is blocked correctly on non-revenue endpoints with 403, role_required, and current_role', async () => {
+      jest
+        .spyOn(walletOwnershipUtils, 'checkCreatorProfileOwnership')
+        .mockResolvedValueOnce({ status: 'forbidden', address: 'a', ownerUserId: 'user-2' });
+      jest
+        .spyOn(coCreatorService, 'getCoCreatorDetail')
+        .mockResolvedValueOnce({
+           key_id: 'key-1',
+           wallet: 'GCOCREATORWALLET11111111111111111111111111111111',
+           role: 'REVENUE',
+           active: true,
+           added_at: new Date().toISOString(),
+           removed_at: null,
+           share_bps: 500,
+        });
+
+      req.path = '/api/v1/keys/key-1/announcements';
+      const middleware = requireCoCreatorPermission();
+      await middleware(req, res, next);
+
+      expect(next).not.toHaveBeenCalled();
+      expect(res.status).toHaveBeenCalledWith(403);
+      expect(res.json).toHaveBeenCalledWith(
+         expect.objectContaining({
+            success: false,
+            error: expect.objectContaining({
+               code: 'FORBIDDEN',
+               role_required: 'CONTENT',
+               current_role: 'REVENUE',
+            }),
+         })
+      );
+   });
+});
diff --git a/src/middlewares/co-creator-permission.middleware.ts b/src/middlewares/co-creator-permission.middleware.ts
new file mode 100644
index 00000000..8af76d09
--- /dev/null
+++ b/src/middlewares/co-creator-permission.middleware.ts
@@ -0,0 +1,182 @@
+// src/middlewares/co-creator-permission.middleware.ts
+//
+// Middleware layer that validates co-creator permissions before proxying
+// creator-only API requests, checking the on-chain co-creator registry
+// to enforce role-based access for ADMIN, CONTENT, and REVENUE roles (#1156).
+
+import { Request, Response, NextFunction } from 'express';
+import { getCoCreatorDetail } from '../modules/co-creators/co-creators.service';
+import { checkCreatorProfileOwnership } from '../utils/wallet-ownership.utils';
+import { ErrorCode, sendError } from '../utils/api-response.utils';
+import { logger } from '../utils/logger.utils';
+
+export interface CoCreatorAuthenticatedRequest extends Request {
+   walletAddress?: string;
+   user?: {
+      wallet: string;
+      userId?: string;
+   };
+}
+
+export type CoCreatorRole = 'ADMIN' | 'CONTENT' | 'REVENUE' | string;
+
+/**
+ * Determine required role based on explicit option or inferred from path.
+ */
+function inferRequiredRole(path: string): 'ADMIN' | 'CONTENT' | 'REVENUE' {
+   const lower = path.toLowerCase();
+   if (
+      lower.includes('announcement') ||
+      lower.includes('post') ||
+      lower.includes('feed')
+   ) {
+      return 'CONTENT';
+   }
+   if (
+      lower.includes('revenue') ||
+      lower.includes('royalty') ||
+      lower.includes('payout') ||
+      lower.includes('dividend') ||
+      lower.includes('fee')
+   ) {
+      return 'REVENUE';
+   }
+   return 'ADMIN';
+}
+
+function extractWallet(req: CoCreatorAuthenticatedRequest): string | undefined {
+   if (req.walletAddress) return req.walletAddress;
+   if (req.user?.wallet) return req.user.wallet;
+   const header = req.headers['x-wallet-address'];
+   if (Array.isArray(header)) return header[0]?.trim() || undefined;
+   if (typeof header === 'string') return header.trim() || undefined;
+   return undefined;
+}
+
+function extractKeyId(
+   req: Request,
+   paramName: string = 'keyId'
+): string | undefined {
+   const raw =
+      req.params[paramName] ??
+      req.params.keyId ??
+      req.params.key_id ??
+      req.params.creatorId ??
+      req.params.id ??
+      req.params.wallet;
+   if (Array.isArray(raw)) return raw[0];
+   return raw;
+}
+
+/**
+ * Middleware factory that enforces co-creator role permissions.
+ *
+ * - Primary creator bypasses co-creator check.
+ * - ADMIN role passes all creator-action endpoints.
+ * - CONTENT role passes announcements endpoints only.
+ * - REVENUE role passes revenue/royalties endpoints only.
+ * - Returns 403 with role_required and current_role when access denied.
+ */
+export function requireCoCreatorPermission(
+   explicitRole?: 'ADMIN' | 'CONTENT' | 'REVENUE',
+   paramName: string = 'keyId'
+) {
+   return async (
+      req: CoCreatorAuthenticatedRequest,
+      res: Response,
+      next: NextFunction
+   ): Promise<void> => {
+      try {
+         const wallet = extractWallet(req);
+         const keyId = extractKeyId(req, paramName);
+
+         if (!wallet) {
+            sendError(
+               res,
+               401,
+               ErrorCode.UNAUTHORIZED,
+               'Wallet address is required for co-creator permission validation.'
+            );
+            return;
+         }
+
+         if (!keyId) {
+            sendError(
+               res,
+               400,
+               ErrorCode.BAD_REQUEST,
+               `Missing required path parameter "${paramName}" for co-creator check.`
+            );
+            return;
+         }
+
+         const requiredRole =
+            explicitRole ??
+            inferRequiredRole(req.path || req.originalUrl || '');
+
+         // 1. Check if primary creator (bypasses co-creator check)
+         try {
+            const ownershipVerdict = await checkCreatorProfileOwnership(
+               wallet,
+               keyId
+            );
+            if (ownershipVerdict.status === 'granted') {
+               return next();
+            }
+         } catch {
+            // Fall through to co-creator check if ownership check errors
+         }
+
+         // 2. Fetch co-creator detail with 60s cache
+         const detail = await getCoCreatorDetail(keyId, wallet);
+         const currentRole = detail && detail.active ? detail.role : null;
+         const upperCurrentRole = currentRole ? currentRole.toUpperCase() : null;
+
+         // ADMIN role passes all creator-action endpoints
+         if (upperCurrentRole === 'ADMIN') {
+            return next();
+         }
+
+         // CONTENT role allowed on announcements only
+         if (upperCurrentRole === 'CONTENT' && requiredRole === 'CONTENT') {
+            return next();
+         }
+
+         // REVENUE role allowed on revenue/royalties only
+         if (upperCurrentRole === 'REVENUE' && requiredRole === 'REVENUE') {
+            return next();
+         }
+
+         // Access denied: return 403 with role_required and current_role
+         const errorBody = {
+            success: false,
+            error: {
+               code: ErrorCode.FORBIDDEN,
+               message: `Access denied. Role "${requiredRole}" required, current role: "${currentRole ?? 'none'}".`,
+               role_required: requiredRole,
+               current_role: currentRole ?? null,
+               details: [
+                  { field: 'role_required', message: requiredRole },
+                  { field: 'current_role', message: currentRole ?? 'none' },
+               ],
+            },
+         };
+
+         if (typeof res.setHeader === 'function') {
+            res.setHeader('Content-Type', 'application/json');
+         }
+         res.status(403).json(errorBody);
+      } catch (error) {
+         logger.error(
+            { error, path: req.path },
+            'Co-creator permission validation failed'
+         );
+         sendError(
+            res,
+            500,
+            ErrorCode.INTERNAL_ERROR,
+            'Failed to validate co-creator permissions.'
+         );
+      }
+   };
+}