> ## Documentation Index > Fetch the complete documentation index at: https://docs.gc.ai/llms.txt > Use this file to discover all available pages before exploring further. # Identify the Caller > Return the identity behind the API key making the request: the organization it belongs to, and, for user-scoped keys, the user it acts as. Works with **either** a user-scoped key (`u:gcai_...`) or an org-scoped key (`gcai_...`). Org-scoped keys carry no user identity, so `user` is `null` for them. Use this to confirm which credential and account a request resolves to before calling `/me/profile` or `/company-profile`. ## OpenAPI ````yaml GET /me openapi: 3.0.3 info: title: GC AI External API version: 1.0.0 description: >- The GC AI External API allows programmatic access to GC AI's chat capabilities. It's designed for integration with workflow automation tools like Zapier, Make, n8n, or custom applications. ## Authentication All API requests must include an API key in the `Authorization` header: ``` Authorization: gcai_xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ``` API keys can be created in the GC AI app under **Settings → API**. ## Multi-turn Conversations Conversations can span multiple turns: pass the `chat_id` returned by a completion back on your next request to continue the same chat. See [Multi-turn Conversations](/api-reference/concepts/multi-turn). ## Current Limitations The following is not yet available via API: - **Interactive clarification**: the model cannot pause to ask the caller a follow-up question; the `askUserQuestions` tool is disabled on the API surface ## Usage Usage is tracked and viewable in the GC AI app under **Settings → API → View Usage**. ## Support For API support, contact [support@gc.ai](mailto:support@gc.ai) or reach out to your account representative. contact: email: support@gc.ai servers: - url: https://app.gc.ai/api/external/v1 description: Production server security: [] tags: - name: Async Jobs description: Poll the status and result of asynchronous API jobs - name: Chat description: AI chat completion endpoints - name: Files description: File upload and management endpoints - name: Folders description: Folder management endpoints - name: Playbooks description: Playbook review endpoints - name: Profiles description: Personal and company profile endpoints - name: Projects description: Project management endpoints - name: Skills description: Skill library management endpoints - name: Utility description: Health check and connectivity endpoints - name: Usage description: Usage and credit/billing reporting endpoints paths: /me: get: tags: - Profiles summary: Identify the caller description: >- Return the identity behind the API key making the request: the organization it belongs to, and, for user-scoped keys, the user it acts as. Works with **either** a user-scoped key (`u:gcai_...`) or an org-scoped key (`gcai_...`). Org-scoped keys carry no user identity, so `user` is `null` for them. Use this to confirm which credential and account a request resolves to before calling `/me/profile` or `/company-profile`. operationId: getMe responses: '200': description: The caller identity content: application/json: schema: $ref: '#/components/schemas/CallerIdentityResponse' '401': description: Missing or malformed API key content: application/json: schema: $ref: '#/components/schemas/Error' '403': description: Invalid API key content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: >- Rate limit exceeded. See [Rate Limits](/api-reference/concepts/rate-limits) for the tiers, limits, and how to back off. headers: Retry-After: schema: type: string description: Seconds to wait before retrying after a rate-limit block. example: '60' required: true description: Seconds to wait before retrying after a rate-limit block. RateLimit-Limit: schema: type: string description: Request quota for the applicable window. example: '3' required: true description: Request quota for the applicable window. RateLimit-Remaining: schema: type: string description: Requests remaining in the current window. example: '0' required: true description: Requests remaining in the current window. RateLimit-Reset: schema: type: string description: Seconds until the quota resets. example: '60' required: true description: Seconds until the quota resets. content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/Error' '503': description: Service temporarily unavailable headers: Retry-After: schema: type: string description: >- Seconds to wait before retrying after a transient service outage. example: '5' required: true description: >- Seconds to wait before retrying after a transient service outage. content: application/json: schema: $ref: '#/components/schemas/Error' security: - ApiKeyAuth: [] components: schemas: CallerIdentityResponse: type: object properties: token_type: type: string enum: - user - organization description: >- Scope of the API key making the request. `user` for personal keys (`u:gcai_...`), `organization` for org keys (`gcai_...`). api_key_id: type: string description: Identifier of the API key used to authenticate the request organization: $ref: '#/components/schemas/CallerOrganization' user: type: object nullable: true properties: id: type: integer description: Calling user identifier email: type: string nullable: true description: Calling user email, or null if unset required: - id - email description: >- The authenticated user, or null for org-scoped keys (which carry no user identity). required: - token_type - api_key_id - organization - user Error: type: object properties: error: type: string description: Error message code: type: string description: >- Machine-readable error code present on some errors (e.g. `RATE_LIMITED`, `INSUFFICIENT_CREDITS`, `TRIAL_NOT_STARTED`, `BILLING_NOT_CONFIGURED`). Branch on this rather than the human-readable `error` string. message: type: string description: Additional error details details: type: object additionalProperties: nullable: true description: Validation error details (for 400 errors) required: - error CallerOrganization: type: object properties: id: type: string format: uuid description: Organization the key belongs to name: type: string nullable: true description: Organization display name, or null if unset required: - id - name securitySchemes: ApiKeyAuth: type: apiKey in: header name: Authorization description: |- API key for authentication. Format: `gcai_xxxxxxxxx` Create API keys in the GC AI app under Settings → API. ````