> ## Documentation Index > Fetch the complete documentation index at: https://docs.apollodeploy.com/llms.txt > Use this file to discover all available pages before exploring further. # Export API key usage > Downloads the full usage log as CSV (default) or JSON. Optional `before` / `after` ISO-8601 timestamps narrow the time range. ### Requirements - **Permission:** `usage:read`. - **Project access:** the path project must match the API key's project. ## OpenAPI ````yaml /signal/api-reference/openapi.json get /v1/projects/{projectId}/api-keys/{keyId}/usage/export openapi: 3.1.0 info: title: Apollo Signal API version: 1.0.0 description: >- Public REST API for transactional email, contacts, audiences, webhooks, metrics, projects, and sending domains. servers: - url: https://api.signal.apollodeploy.com description: Production security: [] tags: - name: Emails description: Send, inspect, cancel, validate, and stream transactional email activity. - name: Metrics description: Read project, topic, message, and deliverability analytics. - name: Suppressions description: Manage addresses that Apollo Signal must not send to. - name: Segments description: Create dynamic contact groups and inspect their membership. - name: Topics description: Manage subscription topics and topic membership. - name: Contact properties description: Define the custom fields available on project contacts. - name: Contacts description: >- Manage contacts, audience membership, images, activity, and engagement data. - name: Webhooks description: Manage webhook endpoints, deliveries, tests, and replays. - name: API key usage description: Inspect API key metadata and request usage without exposing raw keys. - name: Projects description: Inspect projects and project-scoped email logs. - name: Sending domains description: >- Register, verify, inspect, and remove sending domains and BIMI configuration. paths: /v1/projects/{projectId}/api-keys/{keyId}/usage/export: get: tags: - API key usage summary: Export API key usage description: >- Downloads the full usage log as CSV (default) or JSON. Optional `before` / `after` ISO-8601 timestamps narrow the time range. ### Requirements - **Permission:** `usage:read`. - **Project access:** the path project must match the API key's project. operationId: exportApiKeyUsage parameters: - name: projectId in: path required: true deprecated: false explode: false schema: type: string title: String description: >- Project identifier. For API-key authentication, it must match the project bound to the key. - name: keyId in: path required: true deprecated: false explode: false schema: type: string title: String description: API key identifier. Raw API key values are never accepted here. - name: format in: query required: false deprecated: false explode: false schema: type: string title: String description: 'Export encoding: `csv` (default) or `json`.' - name: before in: query required: false deprecated: false explode: false schema: type: string title: String description: Return records before this ISO 8601 timestamp. - name: after in: query required: false deprecated: false explode: false schema: type: string title: String description: >- Return records after this ISO 8601 timestamp, or continue from the supplied membership cursor where documented. responses: '200': description: >- Usage-log attachment encoded as CSV by default, or JSON when `format=json` is supplied. headers: Content-Disposition: description: Attachment filename selected for the requested export format. schema: type: string content: text/csv: schema: type: string description: UTF-8 CSV usage export. application/json: schema: type: string description: JSON usage export document. '401': headers: {} content: application/problem+json: schema: $ref: >- #/components/schemas/com.apollodeploy.commons.core.error.ApiProblem description: >- The API key or stream token is missing, invalid, expired, or inactive. '403': description: >- The credential lacks the required permission or cannot access this project. headers: {} content: application/problem+json: schema: $ref: >- #/components/schemas/com.apollodeploy.commons.core.error.ApiProblem '404': headers: {} content: application/problem+json: schema: $ref: >- #/components/schemas/com.apollodeploy.commons.core.error.ApiProblem description: The requested resource was not found in the authenticated project. '413': headers: {} content: application/problem+json: schema: $ref: >- #/components/schemas/com.apollodeploy.commons.core.error.ApiProblem description: The request or imported data exceeds the supported size. deprecated: false security: - bearerAuth: [] components: schemas: com.apollodeploy.commons.core.error.ApiProblem: type: object properties: code: type: string title: ErrorCode detail: type: string title: String errors: type: array items: $ref: >- #/components/schemas/com.apollodeploy.commons.core.error.FieldProblem title: List instance: type: string title: ProblemInstance requestId: type: string title: String status: type: integer format: int32 title: Int title: type: string title: String type: type: string title: ProblemType required: - code - status - title - type title: ApiProblem com.apollodeploy.commons.core.error.FieldProblem: type: object properties: detail: type: string title: String pointer: type: string title: String required: - detail - pointer title: FieldProblem securitySchemes: bearerAuth: type: http scheme: bearer description: >- Project-bound Apollo Signal API key. Keys begin with `ap_signal_` and must carry the permission shown on the operation. ````