diff --git a/apps/access-api/src/routes.ts b/apps/access-api/src/routes.ts
index 45d061d..a7fa15c 100644
--- a/apps/access-api/src/routes.ts
+++ b/apps/access-api/src/routes.ts
@@ -853,7 +853,7 @@ export async function registerRoutes(app: FastifyInstance): Promise<void> {
   // POST /v1/communities/:communityId/members/:wallet/roles — assign a role to a member
   app.post('/v1/communities/:communityId/members/:wallet/roles', { schema: assignMemberRoleSchema, preHandler: [authenticateApiKey, requireSiweSession, idempotencyPreHandler], onSend: [idempotencyOnSend] }, async (request: FastifyRequest, reply: FastifyReply) => {
     const { communityId, wallet } = request.params as { communityId: string; wallet: string };
-    const body = request.body as { role?: string };
+    const body = request.body as { role?: string; expiresAt?: string | null };
     const role = body.role;
     const requesterWallet = resolveRequesterWallet(request);
 
@@ -876,6 +876,7 @@ export async function registerRoutes(app: FastifyInstance): Promise<void> {
         communityId,
         targetWallet: wallet as import('@guildpass/shared-types').WalletAddress,
         role: role as import('@guildpass/shared-types').Role,
+        expiresAt: body.expiresAt,
       });
       return reply.status(200).send(result);
     } catch (error) {
diff --git a/apps/access-api/src/services/memberService.ts b/apps/access-api/src/services/memberService.ts
index ad62e87..d936142 100644
--- a/apps/access-api/src/services/memberService.ts
+++ b/apps/access-api/src/services/memberService.ts
@@ -922,11 +922,18 @@ export function getMemberService(
     async assignMemberRole(
       input: AssignRoleInput,
     ): Promise<RoleMutationResult> {
-      const { requesterWallet, communityId, targetWallet, role } = input;
+      const { requesterWallet, communityId, targetWallet, role, expiresAt } = input;
       const validRoles: Role[] = ["admin", "member", "contributor"];
       if (!validRoles.includes(role)) {
         throw new MemberServiceError("Invalid role", 400);
       }
+      const parsedExpiresAt =
+        expiresAt === undefined || expiresAt === null
+          ? null
+          : new Date(expiresAt);
+      if (parsedExpiresAt && Number.isNaN(parsedExpiresAt.getTime())) {
+        throw new MemberServiceError("Invalid expiresAt", 400);
+      }
 
       const community = await prismaClient.community.findUnique({
         where: { id: communityId },
@@ -974,7 +981,7 @@ export function getMemberService(
           communityId,
           actorWallet: requesterWallet,
           targetWallet,
-          proposedData: { role },
+          proposedData: { role, expiresAt: expiresAt ?? null },
         });
 
         await tx.roleAssignment.create({
@@ -983,6 +990,7 @@ export function getMemberService(
             role,
             source: "manual",
             active: true,
+            expiresAt: parsedExpiresAt,
           },
         });
       });
diff --git a/packages/policy-engine/test/policy.test.ts b/packages/policy-engine/test/policy.test.ts
index 3bf057a..2981f10 100644
--- a/packages/policy-engine/test/policy.test.ts
+++ b/packages/policy-engine/test/policy.test.ts
@@ -147,29 +147,45 @@ describe("policy engine", () => {
     expect(d.reasons.some((r) => r.code === "RULE_PUBLIC")).toBe(true);
   });
 
-  test("resolveEffectiveRoles adds member when active", () => {
+  test("permanent role assignments grant access when expiresAt is omitted", () => {
     const roles = resolveEffectiveRoles(ctxAdmin);
     expect(roles).toContain("member");
     expect(roles).toContain("admin");
   });
 
-  test("resolveEffectiveRoles filters out expired roles", () => {
-    const now = new Date();
-    const past = new Date(now.getTime() - 1000).toISOString();
-    const future = new Date(now.getTime() + 1000).toISOString();
+  test("future role assignments grant access before expiry", () => {
+    const roles = resolveEffectiveRoles({
+      assignments: [
+        {
+          role: "contributor",
+          source: "manual",
+          active: true,
+          expiresAt: new Date(Date.now() + 1000).toISOString(),
+        },
+      ],
+      membershipState: "invited",
+    });
 
-    const ctx: RoleContext = {
+    expect(roles).toContain("contributor");
+    expect(roles).toContain("member");
+  });
+
+  test("past role assignments do not grant access", () => {
+    const roles = resolveEffectiveRoles({
       assignments: [
-        { role: "admin", source: "manual", active: true, expiresAt: past },
-        { role: "contributor", source: "manual", active: true, expiresAt: future },
+        {
+          role: "admin",
+          source: "manual",
+          active: true,
+          expiresAt: new Date(Date.now() - 1000).toISOString(),
+        },
       ],
-      membershipState: "active",
-    };
+      membershipState: "invited",
+    });
 
-    const roles = resolveEffectiveRoles(ctx);
     expect(roles).not.toContain("admin");
-    expect(roles).toContain("contributor");
-    expect(roles).toContain("member"); // from contributor and membershipState
+    expect(roles).not.toContain("contributor");
+    expect(roles).not.toContain("member");
   });
 
   test("resolveEffectiveRoles applies hierarchy (admin -> contributor -> member)", () => {