diff --git a/lib/privy/public_api/services/policies.rb b/lib/privy/public_api/services/policies.rb
index f369713..c9ea4f8 100644
--- a/lib/privy/public_api/services/policies.rb
+++ b/lib/privy/public_api/services/policies.rb
@@ -66,16 +66,20 @@ def create(policy_create_params:, idempotency_key: nil, request_options: nil)
       # @option policy_update_params [String, nil] :owner_id Key quorum ID to set as owner.
       # @option policy_update_params [Array<Hash>, nil] :rules New rules for the policy.
       # @param authorization_context [Privy::Authorization::AuthorizationContext, nil] Authorization context for owned policies.
+      # @param request_expiry [Integer, nil] Absolute Unix-ms timestamp at which the
+      #   request expires. Defaults to the value computed by the client's
+      #   PrivyRequestExpiryOptions.
       # @param request_options [Privy::RequestOptions, Hash, nil] Transport-level config (timeouts, retries).
       #
       # @return [Privy::Models::Policy]
-      def update(policy_id, policy_update_params:, authorization_context: nil, request_options: nil)
+      def update(policy_id, policy_update_params:, authorization_context: nil, request_expiry: nil, request_options: nil)
         prepared = Privy::Authorization.prepare_request(
           privy_client,
           method: :patch,
           url: Privy::Authorization.signed_url(privy_client, "v1/policies/#{policy_id}"),
           body: policy_update_params,
-          authorization_context: authorization_context
+          authorization_context: authorization_context,
+          request_expiry: privy_client.compute_request_expiry(request_expiry)
         )
         combined_params = policy_update_params.merge(request_options: request_options)
         Privy::Authorization.merge_prepared_headers!(combined_params, prepared.headers)
@@ -92,16 +96,20 @@ def update(policy_id, policy_update_params:, authorization_context: nil, request
       #
       # @param policy_id [String] ID of the policy to delete.
       # @param authorization_context [Privy::Authorization::AuthorizationContext, nil] Authorization context for owned policies.
+      # @param request_expiry [Integer, nil] Absolute Unix-ms timestamp at which the
+      #   request expires. Defaults to the value computed by the client's
+      #   PrivyRequestExpiryOptions.
       # @param request_options [Privy::RequestOptions, Hash, nil] Transport-level config (timeouts, retries).
       #
       # @return [Privy::Models::SuccessResponse]
-      def delete(policy_id, authorization_context: nil, request_options: nil)
+      def delete(policy_id, authorization_context: nil, request_expiry: nil, request_options: nil)
         prepared = Privy::Authorization.prepare_request(
           privy_client,
           method: :delete,
           url: Privy::Authorization.signed_url(privy_client, "v1/policies/#{policy_id}"),
           body: "",
-          authorization_context: authorization_context
+          authorization_context: authorization_context,
+          request_expiry: privy_client.compute_request_expiry(request_expiry)
         )
         # Workaround: the Stainless-generated Ruby client sends Content-Type: application/json on
         # every request (lib/privy/internal/transport/base_client.rb:204), even bodyless DELETEs.
@@ -136,16 +144,20 @@ def delete(policy_id, authorization_context: nil, request_options: nil)
       # @option policy_create_rule_params [String] :action Action when the rule matches ("ALLOW" or "DENY", required).
       # @option policy_create_rule_params [Array<Hash>] :conditions Array of condition objects (required).
       # @param authorization_context [Privy::Authorization::AuthorizationContext, nil] Authorization context for owned policies.
+      # @param request_expiry [Integer, nil] Absolute Unix-ms timestamp at which the
+      #   request expires. Defaults to the value computed by the client's
+      #   PrivyRequestExpiryOptions.
       # @param request_options [Privy::RequestOptions, Hash, nil] Transport-level config (timeouts, retries).
       #
       # @return [Privy::Models::PolicyRuleResponse]
-      def create_rule(policy_id, policy_create_rule_params:, authorization_context: nil, request_options: nil)
+      def create_rule(policy_id, policy_create_rule_params:, authorization_context: nil, request_expiry: nil, request_options: nil)
         prepared = Privy::Authorization.prepare_request(
           privy_client,
           method: :post,
           url: Privy::Authorization.signed_url(privy_client, "v1/policies/#{policy_id}/rules"),
           body: policy_create_rule_params,
-          authorization_context: authorization_context
+          authorization_context: authorization_context,
+          request_expiry: privy_client.compute_request_expiry(request_expiry)
         )
         combined_params = policy_create_rule_params.merge(request_options: request_options)
         Privy::Authorization.merge_prepared_headers!(combined_params, prepared.headers)
@@ -176,6 +188,9 @@ def create_rule(policy_id, policy_create_rule_params:, authorization_context: ni
       # @option policy_update_rule_params [String] :action Action when the rule matches ("ALLOW" or "DENY", required).
       # @option policy_update_rule_params [Array<Hash>] :conditions Array of condition objects (required).
       # @param authorization_context [Privy::Authorization::AuthorizationContext, nil] Authorization context for owned policies.
+      # @param request_expiry [Integer, nil] Absolute Unix-ms timestamp at which the
+      #   request expires. Defaults to the value computed by the client's
+      #   PrivyRequestExpiryOptions.
       # @param request_options [Privy::RequestOptions, Hash, nil] Transport-level config (timeouts, retries).
       #
       # @return [Privy::Models::PolicyRuleResponse]
@@ -184,6 +199,7 @@ def update_rule(
         policy_id:,
         policy_update_rule_params:,
         authorization_context: nil,
+        request_expiry: nil,
         request_options: nil
       )
         prepared = Privy::Authorization.prepare_request(
@@ -191,7 +207,8 @@ def update_rule(
           method: :patch,
           url: Privy::Authorization.signed_url(privy_client, "v1/policies/#{policy_id}/rules/#{rule_id}"),
           body: policy_update_rule_params,
-          authorization_context: authorization_context
+          authorization_context: authorization_context,
+          request_expiry: privy_client.compute_request_expiry(request_expiry)
         )
         combined_params = policy_update_rule_params.merge(
           policy_id: policy_id,
@@ -210,16 +227,20 @@ def update_rule(
       # @param rule_id [String] ID of the rule to delete.
       # @param policy_id [String] ID of the policy the rule belongs to.
       # @param authorization_context [Privy::Authorization::AuthorizationContext, nil] Authorization context for owned policies.
+      # @param request_expiry [Integer, nil] Absolute Unix-ms timestamp at which the
+      #   request expires. Defaults to the value computed by the client's
+      #   PrivyRequestExpiryOptions.
       # @param request_options [Privy::RequestOptions, Hash, nil] Transport-level config (timeouts, retries).
       #
       # @return [Privy::Models::SuccessResponse]
-      def delete_rule(rule_id, policy_id:, authorization_context: nil, request_options: nil)
+      def delete_rule(rule_id, policy_id:, authorization_context: nil, request_expiry: nil, request_options: nil)
         prepared = Privy::Authorization.prepare_request(
           privy_client,
           method: :delete,
           url: Privy::Authorization.signed_url(privy_client, "v1/policies/#{policy_id}/rules/#{rule_id}"),
           body: "",
-          authorization_context: authorization_context
+          authorization_context: authorization_context,
+          request_expiry: privy_client.compute_request_expiry(request_expiry)
         )
         # Workaround: same Content-Type issue as delete — see comment there.
         opts = (request_options || {}).merge(extra_headers: {"Content-Type" => nil})
diff --git a/test/privy/public_api/services/policies_test.rb b/test/privy/public_api/services/policies_test.rb
new file mode 100644
index 0000000..ab3e74a
--- /dev/null
+++ b/test/privy/public_api/services/policies_test.rb
@@ -0,0 +1,150 @@
+# frozen_string_literal: true
+
+require_relative "../../test_helper"
+
+class Privy::Services::PoliciesTest < Minitest::Test
+  extend Minitest::Serial
+  include WebMock::API
+
+  BASE_URL = "https://api.staging.privy.io"
+
+  def before_all
+    super
+    WebMock.enable!
+  end
+
+  def after_all
+    WebMock.disable!
+    super
+  end
+
+  def teardown
+    WebMock.reset!
+    super
+  end
+
+  def build_client(**opts)
+    Privy::PrivyClient.new(app_id: "app-abc", app_secret: "secret", environment: :staging, **opts)
+  end
+
+  def policy_response_body(**overrides)
+    {
+      id: "p-1",
+      chain_type: "ethereum",
+      created_at: 0,
+      name: "test policy",
+      owner_id: nil,
+      rules: [],
+      version: "1.0"
+    }.merge(overrides).to_json
+  end
+
+  def stub_json(method, url, body:)
+    stub_request(method, url).to_return(
+      status: 200,
+      body: body,
+      headers: {"content-type" => "application/json"}
+    )
+  end
+
+  # --- request_expiry on update -----------------------------------------------
+
+  def test_update_default_request_expiry_is_auto_set
+    stub_json(:patch, "#{BASE_URL}/v1/policies/p-1", body: policy_response_body(name: "n"))
+    before = Process.clock_gettime(Process::CLOCK_REALTIME, :millisecond)
+    build_client.policies.update("p-1", policy_update_params: {name: "n"})
+    assert_requested(:patch, "#{BASE_URL}/v1/policies/p-1") do |req|
+      sent = req.headers["Privy-Request-Expiry"].to_i
+      assert_in_delta(before + (15 * 60 * 1_000), sent, 5_000)
+    end
+  end
+
+  def test_update_per_call_request_expiry_overrides_default
+    stub_json(:patch, "#{BASE_URL}/v1/policies/p-1", body: policy_response_body(name: "n"))
+    build_client.policies.update(
+      "p-1",
+      policy_update_params: {name: "n"},
+      request_expiry: 1_750_000_000_000
+    )
+    assert_requested(:patch, "#{BASE_URL}/v1/policies/p-1") do |req|
+      assert_equal("1750000000000", req.headers["Privy-Request-Expiry"])
+    end
+  end
+
+  def test_update_disabled_options_omit_header
+    stub_json(:patch, "#{BASE_URL}/v1/policies/p-1", body: policy_response_body(name: "n"))
+    build_client(request_expiry: Privy::PrivyRequestExpiryOptions.build(disabled: true))
+      .policies.update("p-1", policy_update_params: {name: "n"})
+    assert_requested(:patch, "#{BASE_URL}/v1/policies/p-1") do |req|
+      refute(req.headers.key?("Privy-Request-Expiry"))
+    end
+  end
+
+  def test_update_disabled_options_still_honor_explicit_override
+    stub_json(:patch, "#{BASE_URL}/v1/policies/p-1", body: policy_response_body(name: "n"))
+    build_client(request_expiry: Privy::PrivyRequestExpiryOptions.build(disabled: true))
+      .policies.update("p-1", policy_update_params: {name: "n"}, request_expiry: 1_750_000_000_000)
+    assert_requested(:patch, "#{BASE_URL}/v1/policies/p-1") do |req|
+      assert_equal("1750000000000", req.headers["Privy-Request-Expiry"])
+    end
+  end
+
+  # --- request_expiry on delete / create_rule / update_rule / delete_rule ----
+
+  def test_delete_per_call_request_expiry_overrides_default
+    stub_request(:delete, "#{BASE_URL}/v1/policies/p-1").to_return(
+      status: 200, body: '{"success":true}', headers: {"content-type" => "application/json"}
+    )
+    build_client.policies.delete("p-1", request_expiry: 1_750_000_000_000)
+    assert_requested(:delete, "#{BASE_URL}/v1/policies/p-1") do |req|
+      assert_equal("1750000000000", req.headers["Privy-Request-Expiry"])
+    end
+  end
+
+  def test_create_rule_per_call_request_expiry_overrides_default
+    stub_json(
+      :post,
+      "#{BASE_URL}/v1/policies/p-1/rules",
+      body: '{"id":"r-1","name":"n","method":"eth_sendTransaction","action":"ALLOW","conditions":[]}'
+    )
+    build_client.policies.create_rule(
+      "p-1",
+      policy_create_rule_params: {
+        name: "n", method: "eth_sendTransaction", action: "ALLOW", conditions: []
+      },
+      request_expiry: 1_750_000_000_000
+    )
+    assert_requested(:post, "#{BASE_URL}/v1/policies/p-1/rules") do |req|
+      assert_equal("1750000000000", req.headers["Privy-Request-Expiry"])
+    end
+  end
+
+  def test_update_rule_per_call_request_expiry_overrides_default
+    stub_json(
+      :patch,
+      "#{BASE_URL}/v1/policies/p-1/rules/r-1",
+      body: '{"id":"r-1","name":"n","method":"eth_sendTransaction","action":"ALLOW","conditions":[]}'
+    )
+    build_client.policies.update_rule(
+      "r-1",
+      policy_id: "p-1",
+      policy_update_rule_params: {
+        name: "n", method: "eth_sendTransaction", action: "ALLOW", conditions: []
+      },
+      request_expiry: 1_750_000_000_000
+    )
+    assert_requested(:patch, "#{BASE_URL}/v1/policies/p-1/rules/r-1") do |req|
+      assert_equal("1750000000000", req.headers["Privy-Request-Expiry"])
+    end
+  end
+
+  def test_delete_rule_per_call_request_expiry_overrides_default
+    stub_request(:delete, "#{BASE_URL}/v1/policies/p-1/rules/r-1").to_return(
+      status: 200, body: '{"success":true}', headers: {"content-type" => "application/json"}
+    )
+    build_client.policies.delete_rule("r-1", policy_id: "p-1", request_expiry: 1_750_000_000_000)
+    assert_requested(:delete, "#{BASE_URL}/v1/policies/p-1/rules/r-1") do |req|
+      assert_equal("1750000000000", req.headers["Privy-Request-Expiry"])
+    end
+  end
+end