> ## Documentation Index > Fetch the complete documentation index at: https://opentouter.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Bulk assign keys to a guardrail > Assign multiple API keys to a specific guardrail. A key may hold at most one guardrail; assigning replaces any existing assignment. [Management key](/docs/guides/overview/auth/management-api-keys) required. ## OpenAPI ````yaml /openapi/openapi.yaml post /guardrails/{id}/assignments/keys openapi: 3.1.0 info: contact: email: support@openrouter.ai name: OpenRouter Support url: https://openrouter.ai/docs description: OpenAI-compatible API with additional OpenRouter features license: name: MIT url: https://opensource.org/licenses/MIT title: OpenRouter API version: 1.0.0 servers: - description: Production server url: https://openrouter.ai/api/v1 x-speakeasy-server-id: production security: - apiKey: [] tags: - description: API key management endpoints name: API Keys - description: Analytics and usage endpoints name: Analytics - description: Anthropic Messages endpoints name: Anthropic Messages - description: BYOK endpoints name: BYOK - description: Benchmarks endpoints name: Benchmarks - description: Chat completion endpoints name: Chat - description: Task classification market-share endpoints name: Classifications - description: Credit management endpoints name: Credits - description: Datasets endpoints name: Datasets - description: Text embedding endpoints name: Embeddings - description: Endpoint information name: Endpoints - description: Files endpoints name: Files - description: Generation history endpoints name: Generations - description: Guardrails endpoints name: Guardrails - description: Images endpoints name: Images - description: Model information endpoints name: Models - description: OAuth authentication endpoints name: OAuth - description: Observability endpoints name: Observability - description: Organization endpoints name: Organization - description: Presets endpoints name: Presets - description: Provider information endpoints name: Providers - description: Rerank endpoints name: Rerank - description: Speech-to-text endpoints name: STT x-displayName: Transcriptions - description: Text-to-speech endpoints name: TTS x-displayName: Speech - description: Video Generation endpoints name: Video Generation - description: Workspaces endpoints name: Workspaces - description: beta.Analytics endpoints name: beta.Analytics - description: beta.responses endpoints name: beta.responses externalDocs: description: OpenRouter Documentation url: https://openrouter.ai/docs paths: /guardrails/{id}/assignments/keys: post: tags: - Guardrails summary: Bulk assign keys to a guardrail description: >- Assign multiple API keys to a specific guardrail. A key may hold at most one guardrail; assigning replaces any existing assignment. [Management key](/docs/guides/overview/auth/management-api-keys) required. operationId: bulkAssignKeysToGuardrail parameters: - description: The unique identifier of the guardrail in: path name: id required: true schema: description: The unique identifier of the guardrail example: 550e8400-e29b-41d4-a716-446655440000 format: uuid type: string requestBody: content: application/json: example: key_hashes: - >- c56454edb818d6b14bc0d61c46025f1450b0f4012d12304ab40aacb519fcbc93 schema: $ref: '#/components/schemas/BulkAssignKeysRequest' required: true responses: '200': content: application/json: example: assigned_count: 3 schema: $ref: '#/components/schemas/BulkAssignKeysResponse' description: Assignment result '400': content: application/json: example: error: code: 400 message: Invalid request parameters schema: $ref: '#/components/schemas/BadRequestResponse' description: Bad Request - Invalid request parameters or malformed input '401': content: application/json: example: error: code: 401 message: Missing Authentication header schema: $ref: '#/components/schemas/UnauthorizedResponse' description: Unauthorized - Authentication required or invalid credentials '404': content: application/json: example: error: code: 404 message: Resource not found schema: $ref: '#/components/schemas/NotFoundResponse' description: Not Found - Resource does not exist '500': content: application/json: example: error: code: 500 message: Internal Server Error schema: $ref: '#/components/schemas/InternalServerResponse' description: Internal Server Error - Unexpected server error components: schemas: BulkAssignKeysRequest: example: key_hashes: - c56454edb818d6b14bc0d61c46025f1450b0f4012d12304ab40aacb519fcbc93 properties: key_hashes: description: Array of API key hashes to assign to the guardrail example: - c56454edb818d6b14bc0d61c46025f1450b0f4012d12304ab40aacb519fcbc93 items: minLength: 1 type: string minItems: 1 type: array required: - key_hashes type: object BulkAssignKeysResponse: example: assigned_count: 3 properties: assigned_count: description: Number of keys successfully assigned example: 3 type: integer required: - assigned_count type: object BadRequestResponse: description: Bad Request - Invalid request parameters or malformed input example: error: code: 400 message: Invalid request parameters properties: error: $ref: '#/components/schemas/BadRequestResponseErrorData' openrouter_metadata: additionalProperties: nullable: true nullable: true type: object user_id: nullable: true type: string required: - error type: object UnauthorizedResponse: description: Unauthorized - Authentication required or invalid credentials example: error: code: 401 message: Missing Authentication header properties: error: $ref: '#/components/schemas/UnauthorizedResponseErrorData' openrouter_metadata: additionalProperties: nullable: true nullable: true type: object user_id: nullable: true type: string required: - error type: object NotFoundResponse: description: Not Found - Resource does not exist example: error: code: 404 message: Resource not found properties: error: $ref: '#/components/schemas/NotFoundResponseErrorData' openrouter_metadata: additionalProperties: nullable: true nullable: true type: object user_id: nullable: true type: string required: - error type: object InternalServerResponse: description: Internal Server Error - Unexpected server error example: error: code: 500 message: Internal Server Error properties: error: $ref: '#/components/schemas/InternalServerResponseErrorData' openrouter_metadata: additionalProperties: nullable: true nullable: true type: object user_id: nullable: true type: string required: - error type: object BadRequestResponseErrorData: description: Error data for BadRequestResponse example: code: 400 message: Invalid request parameters properties: code: type: integer message: type: string metadata: additionalProperties: nullable: true nullable: true type: object required: - code - message type: object UnauthorizedResponseErrorData: description: Error data for UnauthorizedResponse example: code: 401 message: Missing Authentication header properties: code: type: integer message: type: string metadata: additionalProperties: nullable: true nullable: true type: object required: - code - message type: object NotFoundResponseErrorData: description: Error data for NotFoundResponse example: code: 404 message: Resource not found properties: code: type: integer message: type: string metadata: additionalProperties: nullable: true nullable: true type: object required: - code - message type: object InternalServerResponseErrorData: description: Error data for InternalServerResponse example: code: 500 message: Internal Server Error properties: code: type: integer message: type: string metadata: additionalProperties: nullable: true nullable: true type: object required: - code - message type: object securitySchemes: apiKey: description: API key as bearer token in Authorization header scheme: bearer type: http ````