@@ -6348,6 +6348,7 @@ components:
         allowed_models: null
         allowed_user_ids: null
         created_at: '2025-08-24T10:30:00Z'
+        declared_region: null
         declared_zdr: null
         disabled: false
         id: '11111111-2222-3333-4444-555555555555'
@@ -6392,6 +6393,17 @@ components:
           description: 'ISO timestamp of when the credential was created.'
           example: '2025-08-24T10:30:00Z'
           type: 'string'
+        declared_region:
+          description: 'Your declaration of the data region in which the upstream provider account behind this credential processes requests, used for routing eligibility on OpenRouter''s regional hosts. `null` means undeclared and `global` is behaviorally identical: the credential follows the region OpenRouter records for the endpoint. `europe` or `us` lets requests to `eu.openrouter.ai` or `us.openrouter.ai` use this credential for that provider (private endpoints, endpoints pinned to another cloud region, cross-region inference profiles and video models are excluded). Self-declared and not verified by OpenRouter. For OpenAI and Fireworks the region comes from the key material (a `{"api_key": ..., "region": ...}` key), so the value must match the key''s region. Among other providers, only Azure accepts `europe` or `us`.'
+          enum:
+            - 'global'
+            - 'europe'
+            - 'us'
+            - null
+          example: null
+          type:
+            - 'string'
+            - 'null'
         declared_zdr:
           description: 'Your declaration of whether the upstream provider account behind this credential has zero data retention (ZDR). `null` inherits OpenRouter''s data policy for the provider''s endpoint; `true` declares the account ZDR so requests that require ZDR may route to this credential even when the shared endpoint retains data; `false` declares it non-ZDR so such requests never route to it. Self-declared and not verified by OpenRouter.'
           example: null
@@ -6452,6 +6464,7 @@ components:
         - 'is_required'
         - 'is_byok_only'
         - 'declared_zdr'
+        - 'declared_region'
         - 'allowed_models'
         - 'allowed_api_key_hashes'
         - 'allowed_user_ids'
@@ -9175,6 +9188,17 @@ components:
           type:
             - 'array'
             - 'null'
+        declared_region:
+          description: 'Your declaration of the data region in which the upstream provider account behind this credential processes requests, used for routing eligibility on OpenRouter''s regional hosts. `null` means undeclared and `global` is behaviorally identical: the credential follows the region OpenRouter records for the endpoint. `europe` or `us` lets requests to `eu.openrouter.ai` or `us.openrouter.ai` use this credential for that provider (private endpoints, endpoints pinned to another cloud region, cross-region inference profiles and video models are excluded). Self-declared and not verified by OpenRouter. For OpenAI and Fireworks the region comes from the key material (a `{"api_key": ..., "region": ...}` key), so the value must match the key''s region. Among other providers, only Azure accepts `europe` or `us`. Defaults to the key''s region for OpenAI and Fireworks, otherwise `null`.'
+          enum:
+            - 'global'
+            - 'europe'
+            - 'us'
+            - null
+          example: null
+          type:
+            - 'string'
+            - 'null'
         declared_zdr:
           description: 'Your declaration of whether the upstream provider account behind this credential has zero data retention (ZDR). `null` inherits OpenRouter''s data policy for the provider''s endpoint; `true` declares the account ZDR so requests that require ZDR may route to this credential even when the shared endpoint retains data; `false` declares it non-ZDR so such requests never route to it. Self-declared and not verified by OpenRouter. Defaults to `null`.'
           example: null
@@ -9227,6 +9251,7 @@ components:
           allowed_models: null
           allowed_user_ids: null
           created_at: '2025-08-24T10:30:00Z'
+          declared_region: null
           declared_zdr: null
           disabled: false
           id: '11111111-2222-3333-4444-555555555555'
@@ -12580,6 +12605,7 @@ components:
           allowed_models: null
           allowed_user_ids: null
           created_at: '2025-08-24T10:30:00Z'
+          declared_region: null
           declared_zdr: null
           disabled: false
           id: '11111111-2222-3333-4444-555555555555'
@@ -15416,6 +15442,7 @@ components:
             allowed_models: null
             allowed_user_ids: null
             created_at: '2025-08-24T10:30:00Z'
+            declared_region: null
             declared_zdr: null
             disabled: false
             id: '11111111-2222-3333-4444-555555555555'
@@ -30885,6 +30912,17 @@ components:
           type:
             - 'array'
             - 'null'
+        declared_region:
+          description: 'Your declaration of the data region in which the upstream provider account behind this credential processes requests, used for routing eligibility on OpenRouter''s regional hosts. `null` means undeclared and `global` is behaviorally identical: the credential follows the region OpenRouter records for the endpoint. `europe` or `us` lets requests to `eu.openrouter.ai` or `us.openrouter.ai` use this credential for that provider (private endpoints, endpoints pinned to another cloud region, cross-region inference profiles and video models are excluded). Self-declared and not verified by OpenRouter. For OpenAI and Fireworks the region comes from the key material (a `{"api_key": ..., "region": ...}` key), so the value must match the key''s region. Among other providers, only Azure accepts `europe` or `us`. Omit to leave the stored value unchanged (rotating an OpenAI or Fireworks `key` re-derives it from the new key); `null` clears the declaration.'
+          enum:
+            - 'global'
+            - 'europe'
+            - 'us'
+            - null
+          example: null
+          type:
+            - 'string'
+            - 'null'
         declared_zdr:
           description: 'Your declaration of whether the upstream provider account behind this credential has zero data retention (ZDR). `null` inherits OpenRouter''s data policy for the provider''s endpoint; `true` declares the account ZDR so requests that require ZDR may route to this credential even when the shared endpoint retains data; `false` declares it non-ZDR so such requests never route to it. Self-declared and not verified by OpenRouter. Omit to leave the stored value unchanged; `null` clears the declaration.'
           example: null
@@ -30927,6 +30965,7 @@ components:
           allowed_models: null
           allowed_user_ids: null
           created_at: '2025-08-24T10:30:00Z'
+          declared_region: null
           declared_zdr: null
           disabled: false
           id: '11111111-2222-3333-4444-555555555555'
@@ -35287,6 +35326,7 @@ paths:
                     allowed_models: null
                     allowed_user_ids: null
                     created_at: '2025-08-24T10:30:00Z'
+                    declared_region: null
                     declared_zdr: null
                     disabled: false
                     id: '11111111-2222-3333-4444-555555555555'
@@ -35370,6 +35410,7 @@ paths:
                   allowed_models: null
                   allowed_user_ids: null
                   created_at: '2025-08-24T10:30:00Z'
+                  declared_region: null
                   declared_zdr: null
                   disabled: false
                   id: '11111111-2222-3333-4444-555555555555'
@@ -35508,6 +35549,7 @@ paths:
                   allowed_models: null
                   allowed_user_ids: null
                   created_at: '2025-08-24T10:30:00Z'
+                  declared_region: null
                   declared_zdr: null
                   disabled: false
                   id: '11111111-2222-3333-4444-555555555555'
@@ -35588,6 +35630,7 @@ paths:
                   allowed_models: null
                   allowed_user_ids: null
                   created_at: '2025-08-24T10:30:00Z'
+                  declared_region: null
                   declared_zdr: null
                   disabled: false
                   id: '11111111-2222-3333-4444-555555555555'
@@ -35642,6 +35685,16 @@ paths:
               schema:
                 $ref: '#/components/schemas/NotFoundResponse'
           description: 'Not Found - Resource does not exist'
+        '409':
+          content:
+            application/json:
+              example:
+                error:
+                  code: 409
+                  message: 'Resource conflict. Please try again later.'
+              schema:
+                $ref: '#/components/schemas/ConflictResponse'
+          description: 'Conflict - Resource conflict or concurrent modification'
         '500':
           content:
             application/json: