diff --git a/src/users/users.controller.spec.ts b/src/users/users.controller.spec.ts
index c593826..204d006 100644
--- a/src/users/users.controller.spec.ts
+++ b/src/users/users.controller.spec.ts
@@ -12,6 +12,7 @@ describe('UsersController', () => {
     list: jest.Mock;
     findById: jest.Mock;
     setStellarAddress: jest.Mock;
+    clearStellarAddress: jest.Mock;
   };
 
   const mockPublicUser: PublicUserDto = {
@@ -32,6 +33,9 @@ describe('UsersController', () => {
         ...mockPublicUser,
         stellarAddress: 'GBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBWHF',
       }),
+      clearStellarAddress: jest
+        .fn()
+        .mockResolvedValue({ ...mockPublicUser, stellarAddress: null }),
     };
 
     const module: TestingModule = await Test.createTestingModule({
@@ -93,4 +97,33 @@ describe('UsersController', () => {
 
     expect(usersService.setStellarAddress).not.toHaveBeenCalled();
   });
+
+  describe('clearStellarAddress (DELETE :id/stellar-address) (#714)', () => {
+    it('clears the stellar address for the authenticated user', async () => {
+      const caller: AuthenticatedUser = {
+        userId: 'user-1',
+        username: 'alice',
+        roles: [UserRole.CONTRIBUTOR],
+      };
+
+      const result = await controller.clearStellarAddress('user-1', caller);
+
+      expect(result.stellarAddress).toBeNull();
+      expect(usersService.clearStellarAddress).toHaveBeenCalledWith('user-1');
+    });
+
+    it('throws 403 ForbiddenException when trying to clear another user address', async () => {
+      const caller: AuthenticatedUser = {
+        userId: 'user-2',
+        username: 'bob',
+        roles: [UserRole.CONTRIBUTOR],
+      };
+
+      expect(() =>
+        controller.clearStellarAddress('user-1', caller),
+      ).toThrow(ForbiddenException);
+
+      expect(usersService.clearStellarAddress).not.toHaveBeenCalled();
+    });
+  });
 });
diff --git a/src/users/users.controller.ts b/src/users/users.controller.ts
index 8710259..f51bd6d 100644
--- a/src/users/users.controller.ts
+++ b/src/users/users.controller.ts
@@ -1,8 +1,11 @@
 import {
   Body,
   Controller,
+  Delete,
   ForbiddenException,
   Get,
+  HttpCode,
+  HttpStatus,
   Param,
   ParseUUIDPipe,
   Patch,
@@ -60,4 +63,24 @@ export class UsersController {
     }
     return this.usersService.setStellarAddress(id, dto.stellarAddress);
   }
+
+  // #714: disconnect() was sending PATCH { stellarAddress: null } which the
+  // @IsStellarAddress() validator on SetStellarAddressDto always rejects with
+  // 400. A dedicated DELETE route accepts no body and sets the column to null,
+  // keeping the PATCH route strictly typed for real addresses.
+  @ApiBearerAuth()
+  @UseGuards(JwtAuthGuard)
+  @Delete(':id/stellar-address')
+  @HttpCode(HttpStatus.OK)
+  clearStellarAddress(
+    @Param('id', new ParseUUIDPipe()) id: string,
+    @CurrentUser() user: AuthenticatedUser,
+  ) {
+    if (user && user.userId !== id) {
+      throw new ForbiddenException(
+        'You may only update your own Stellar address',
+      );
+    }
+    return this.usersService.clearStellarAddress(id);
+  }
 }
diff --git a/src/users/users.service.spec.ts b/src/users/users.service.spec.ts
index ba1fe1a..17463ae 100644
--- a/src/users/users.service.spec.ts
+++ b/src/users/users.service.spec.ts
@@ -320,6 +320,29 @@ describe('UsersService', () => {
     });
   });
 
+  describe('clearStellarAddress', () => {
+    it('throws NotFoundException when the user does not exist', async () => {
+      userRepo.findOne.mockResolvedValue(null);
+      await expect(service.clearStellarAddress('missing')).rejects.toThrow(
+        NotFoundException,
+      );
+    });
+
+    it('sets stellarAddress to null and persists the change (#714)', async () => {
+      userRepo.findOne.mockResolvedValue({
+        id: 'u1',
+        stellarAddress: 'GLINKEDADDRESS',
+      });
+
+      const user = await service.clearStellarAddress('u1');
+
+      expect(user.stellarAddress).toBeNull();
+      expect(userRepo.save).toHaveBeenCalledWith(
+        expect.objectContaining({ id: 'u1', stellarAddress: null }),
+      );
+    });
+  });
+
   describe('list', () => {
     it('returns every user mapped to its public shape', async () => {
       userRepo.find = jest.fn().mockResolvedValue([
diff --git a/src/users/users.service.ts b/src/users/users.service.ts
index 079ffae..0c35109 100644
--- a/src/users/users.service.ts
+++ b/src/users/users.service.ts
@@ -180,6 +180,12 @@ export class UsersService {
     return toPublicUser(await this.userRepo.save(user));
   }
 
+  async clearStellarAddress(userId: string): Promise<PublicUserDto> {
+    const user = await this.findOneRaw(userId);
+    user.stellarAddress = null;
+    return toPublicUser(await this.userRepo.save(user));
+  }
+
   async list(): Promise<PublicUserDto[]> {
     const users = await this.userRepo.find();
     return users.map(toPublicUser);