diff --git a/src/lib/seam/connect/models/custom-metadata.ts b/src/lib/seam/connect/models/custom-metadata.ts
index 9a3bc9ec..88462d37 100644
--- a/src/lib/seam/connect/models/custom-metadata.ts
+++ b/src/lib/seam/connect/models/custom-metadata.ts
@@ -31,10 +31,21 @@ export const custom_metadata_input = z
     'Set of up to 50 key:value pairs, with key names up to 40 characters long that cannot contain a period (.). Accepts string or Boolean values. Strings are limited to 500 characters. Adding custom metadata to a resource, such as a [Connect Webview](https://docs.seam.co/core-concepts/connect-webviews/attaching-custom-data-to-the-connect-webview), [connected account](https://docs.seam.co/core-concepts/connected-accounts/adding-custom-metadata-to-a-connected-account), or [device](https://docs.seam.co/core-concepts/devices/adding-custom-metadata-to-a-device), enables you to store custom information, like customer details or internal IDs from your application. Set a key to `null` or to an empty string to remove that key from the custom metadata.',
   )
 
+// A query string can only carry `null` for an unset value — the serializer drops
+// an empty string — so `""` is dropped here rather than given a meaning it could
+// not keep on a GET. It has to be the schema and not a handler: lib/api/pagination.ts
+// serializes req.commonParams for next_page_url and the cursor hash.
 export const custom_metadata_has = z
-  .record(custom_metadata_has_key, z.union([z.string(), z.boolean()]))
+  .record(custom_metadata_has_key, z.union([z.string(), z.boolean(), z.null()]))
+  .transform((custom_metadata_has_filter) =>
+    Object.fromEntries(
+      Object.entries(custom_metadata_has_filter).filter(
+        ([, metadata_value]) => metadata_value !== '',
+      ),
+    ),
+  )
   .describe(
-    'Set of key:value pairs by which to filter. Key names cannot contain a period (.). Accepts string or Boolean values. Specify an empty string to match a key that is unset or set to an empty string.',
+    'Set of key:value pairs by which to filter. Key names cannot contain a period (.). Accepts string or Boolean values, or `null` to match a key that is unset. A key given an empty string is omitted from the filter.',
   )
 
 export const custom_metadata = z
@@ -46,3 +57,5 @@ export const custom_metadata = z
 export type CustomMetadata = z.output<typeof custom_metadata>
 
 export type CustomMetadataInput = z.input<typeof custom_metadata_input>
+
+export type CustomMetadataHas = z.output<typeof custom_metadata_has>
diff --git a/src/lib/seam/connect/openapi.ts b/src/lib/seam/connect/openapi.ts
index c695b13f..25abdaa7 100644
--- a/src/lib/seam/connect/openapi.ts
+++ b/src/lib/seam/connect/openapi.ts
@@ -51244,10 +51244,11 @@ const openapi: OpenAPISpec = {
             name: 'custom_metadata_has',
             schema: {
               additionalProperties: {
+                nullable: true,
                 oneOf: [{ type: 'string' }, { type: 'boolean' }],
               },
               description:
-                'Custom metadata pairs by which you want to [filter Connect Webviews](https://docs.seam.co/core-concepts/connect-webviews/filtering-connect-webviews-by-custom-metadata). Returns Connect Webviews with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify an empty string to match a key that is unset or set to an empty string.',
+                'Custom metadata pairs by which you want to [filter Connect Webviews](https://docs.seam.co/core-concepts/connect-webviews/filtering-connect-webviews-by-custom-metadata). Returns Connect Webviews with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify `null` to match a key that is unset. A key given an empty string is omitted from the filter.',
               type: 'object',
             },
           },
@@ -51333,10 +51334,11 @@ const openapi: OpenAPISpec = {
                 properties: {
                   custom_metadata_has: {
                     additionalProperties: {
+                      nullable: true,
                       oneOf: [{ type: 'string' }, { type: 'boolean' }],
                     },
                     description:
-                      'Custom metadata pairs by which you want to [filter Connect Webviews](https://docs.seam.co/core-concepts/connect-webviews/filtering-connect-webviews-by-custom-metadata). Returns Connect Webviews with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify an empty string to match a key that is unset or set to an empty string.',
+                      'Custom metadata pairs by which you want to [filter Connect Webviews](https://docs.seam.co/core-concepts/connect-webviews/filtering-connect-webviews-by-custom-metadata). Returns Connect Webviews with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify `null` to match a key that is unset. A key given an empty string is omitted from the filter.',
                     type: 'object',
                   },
                   customer_key: {
@@ -51672,10 +51674,11 @@ const openapi: OpenAPISpec = {
             name: 'custom_metadata_has',
             schema: {
               additionalProperties: {
+                nullable: true,
                 oneOf: [{ type: 'string' }, { type: 'boolean' }],
               },
               description:
-                'Custom metadata pairs by which you want to filter connected accounts. Returns connected accounts with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify an empty string to match a key that is unset or set to an empty string.',
+                'Custom metadata pairs by which you want to filter connected accounts. Returns connected accounts with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify `null` to match a key that is unset. A key given an empty string is omitted from the filter.',
               type: 'object',
             },
           },
@@ -51781,10 +51784,11 @@ const openapi: OpenAPISpec = {
                 properties: {
                   custom_metadata_has: {
                     additionalProperties: {
+                      nullable: true,
                       oneOf: [{ type: 'string' }, { type: 'boolean' }],
                     },
                     description:
-                      'Custom metadata pairs by which you want to filter connected accounts. Returns connected accounts with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify an empty string to match a key that is unset or set to an empty string.',
+                      'Custom metadata pairs by which you want to filter connected accounts. Returns connected accounts with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify `null` to match a key that is unset. A key given an empty string is omitted from the filter.',
                     type: 'object',
                   },
                   customer_key: {
@@ -55498,10 +55502,11 @@ const openapi: OpenAPISpec = {
             name: 'custom_metadata_has',
             schema: {
               additionalProperties: {
+                nullable: true,
                 oneOf: [{ type: 'string' }, { type: 'boolean' }],
               },
               description:
-                'Set of key:value [custom metadata](https://docs.seam.co/core-concepts/devices/adding-custom-metadata-to-a-device) pairs for which you want to list devices. Key names cannot contain a period (.). Specify an empty string to match a key that is unset or set to an empty string.',
+                'Set of key:value [custom metadata](https://docs.seam.co/core-concepts/devices/adding-custom-metadata-to-a-device) pairs for which you want to list devices. Key names cannot contain a period (.). Specify `null` to match a key that is unset. A key given an empty string is omitted from the filter.',
               type: 'object',
             },
           },
@@ -55688,10 +55693,11 @@ const openapi: OpenAPISpec = {
                   },
                   custom_metadata_has: {
                     additionalProperties: {
+                      nullable: true,
                       oneOf: [{ type: 'string' }, { type: 'boolean' }],
                     },
                     description:
-                      'Set of key:value [custom metadata](https://docs.seam.co/core-concepts/devices/adding-custom-metadata-to-a-device) pairs for which you want to list devices. Key names cannot contain a period (.). Specify an empty string to match a key that is unset or set to an empty string.',
+                      'Set of key:value [custom metadata](https://docs.seam.co/core-concepts/devices/adding-custom-metadata-to-a-device) pairs for which you want to list devices. Key names cannot contain a period (.). Specify `null` to match a key that is unset. A key given an empty string is omitted from the filter.',
                     type: 'object',
                   },
                   customer_key: {
diff --git a/src/lib/seam/connect/route-types.ts b/src/lib/seam/connect/route-types.ts
index 799dd8bc..bcda2da1 100644
--- a/src/lib/seam/connect/route-types.ts
+++ b/src/lib/seam/connect/route-types.ts
@@ -48415,10 +48415,10 @@ export type Routes = {
       customer_key?: string | undefined
       /** Your user ID for the user by which you want to filter Connect Webviews. */
       user_identifier_key?: string | undefined
-      /** Custom metadata pairs by which you want to [filter Connect Webviews](https://docs.seam.co/core-concepts/connect-webviews/filtering-connect-webviews-by-custom-metadata). Returns Connect Webviews with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify an empty string to match a key that is unset or set to an empty string. */
+      /** Custom metadata pairs by which you want to [filter Connect Webviews](https://docs.seam.co/core-concepts/connect-webviews/filtering-connect-webviews-by-custom-metadata). Returns Connect Webviews with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify `null` to match a key that is unset. A key given an empty string is omitted from the filter. */
       custom_metadata_has?:
         | {
-            [x: string]: string | boolean
+            [x: string]: string | boolean | null
           }
         | undefined
       /** String for which to search. Filters returned Connect Webviews to include all records that satisfy a partial match using `connect_webview_id`, `accepted_providers`, `custom_metadata`, or `customer_key`. */
@@ -48747,10 +48747,10 @@ export type Routes = {
     commonParams: {
       /** Your user ID for the user by which you want to filter connected accounts. */
       user_identifier_key?: string | undefined
-      /** Custom metadata pairs by which you want to filter connected accounts. Returns connected accounts with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify an empty string to match a key that is unset or set to an empty string. */
+      /** Custom metadata pairs by which you want to filter connected accounts. Returns connected accounts with `custom_metadata` that contains all of the provided key:value pairs. Key names cannot contain a period (.). Specify `null` to match a key that is unset. A key given an empty string is omitted from the filter. */
       custom_metadata_has?:
         | {
-            [x: string]: string | boolean
+            [x: string]: string | boolean | null
           }
         | undefined
       /** Customer key by which you want to filter connected accounts. */
@@ -52363,10 +52363,10 @@ export type Routes = {
       created_before?: Date | undefined
       /** Your own internal user ID for the user for which you want to list devices. */
       user_identifier_key?: string | undefined
-      /** Set of key:value [custom metadata](https://docs.seam.co/core-concepts/devices/adding-custom-metadata-to-a-device) pairs for which you want to list devices. Key names cannot contain a period (.). Specify an empty string to match a key that is unset or set to an empty string. */
+      /** Set of key:value [custom metadata](https://docs.seam.co/core-concepts/devices/adding-custom-metadata-to-a-device) pairs for which you want to list devices. Key names cannot contain a period (.). Specify `null` to match a key that is unset. A key given an empty string is omitted from the filter. */
       custom_metadata_has?:
         | {
-            [x: string]: string | boolean
+            [x: string]: string | boolean | null
           }
         | undefined
       /** Identifies the specific page of results to return, obtained from the previous page's `next_page_cursor`. */