> ## Documentation Index > Fetch the complete documentation index at: https://docs.zebratruth.ai/llms.txt > Use this file to discover all available pages before exploring further. # Get usage for one externalId > Ledger entries whose `externalId` equals `projectId`, newest first. `totals` covers the returned page only. Not billed. ## OpenAPI ````yaml /openapi/zebratruth-v1.yaml get /usage/project/{projectId} openapi: 3.1.0 info: title: ZebraTruth Compliance API version: 1.0.0 description: > AI-powered compliance checking for advertising content. Check text and images against jurisdiction laws, platform policies, and rights clearance requirements. Results include embeddable annotations mapped to content locations (text spans, video timestamps, image regions). contact: name: ZebraTruth Support email: support@zebratruth.ai url: https://developers.zebratruth.ai license: name: MIT url: https://opensource.org/licenses/MIT servers: - url: https://api.zebratruth.ai/v1 description: Production security: - bearerAuth: [] tags: - name: Video Compliance description: > **Primary endpoint.** Async compliance analysis for video ads. 3-step flow: get an upload URL, upload the video bytes, submit for analysis. Poll or receive an HMAC-signed webhook with the report. Returns timestamped findings citing stable evidence IDs (`audio_NNN`, `frame_NNN`, `ocr_NNN`, `signal_NNN`). 3-180 second videos. mp4 / webm / quicktime. Built for ad agencies and creators. - name: Authentication description: Validate API keys and check account status - name: Compliance description: >- Run compliance checks on text + image content (sync). For video, use the Video Compliance endpoints above. - name: Agents description: Discover and invoke individual compliance agents - name: Jobs description: Poll async job status and view execution traces - name: Reports description: Retrieve and replay compliance reports - name: Observability description: Request logs and webhook delivery status - name: Billing description: Subscriptions, plan changes, and credit balance - name: Documents description: Extract text from PDF and Word documents before or as part of a check - name: Check History description: List and retrieve past compliance checks for the workspace - name: Provenance description: Inspect and sign Content Credentials (C2PA) on images and video - name: Corpus description: >- Review queue for proposed changes to the governed legal corpus (dashboard session) - name: Webhooks description: Saved webhook endpoints (dashboard session) and delivery logs paths: /usage/project/{projectId}: get: tags: - Billing summary: Get usage for one externalId description: > Ledger entries whose `externalId` equals `projectId`, newest first. `totals` covers the returned page only. Not billed. operationId: getUsageByProject parameters: - name: projectId in: path required: true schema: type: string - name: since in: query schema: type: string format: date-time - name: until in: query schema: type: string format: date-time - name: limit in: query schema: type: integer default: 50 minimum: 1 maximum: 500 - name: offset in: query schema: type: integer default: 0 responses: '200': description: Project usage content: application/json: schema: $ref: '#/components/schemas/UsageProjectResponse' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/ForbiddenCoded' components: schemas: UsageProjectResponse: type: object properties: projectId: type: string tenantId: type: string totals: type: object description: Computed over the returned page only. properties: credits: type: number requests: type: integer cached: type: integer entries: type: array items: type: object properties: requestId: type: string feature: type: string status: type: string creditsUsed: type: number latencyMs: type: integer cached: type: boolean createdAt: type: string format: date-time CodedError: type: object description: > Standard error envelope. `data.code` is the stable discriminator to branch on; `statusMessage` is the human-readable reason. Unless a response documents extra named fields, `data` is reduced to `{ code }` before it is sent. required: - statusCode - message properties: error: type: boolean example: true url: type: string format: uri statusCode: type: integer statusMessage: type: string message: type: string data: type: object required: - code properties: code: type: string example: review_scope_not_enabled additionalProperties: true responses: BadRequest: description: | Request body failed validation. Standard error envelope. The `message` field describes what's wrong (typically a Zod validation error message listing the offending fields). content: application/json: schema: type: object description: Standard error envelope. required: - statusCode - message properties: error: type: boolean example: true url: type: string format: uri statusCode: type: integer example: 400 statusMessage: type: string example: 'jurisdictions: Required, platforms: Required' message: type: string description: >- Canonical human-readable reason. For Zod failures, lists each invalid field. example: 'jurisdictions: Required, platforms: Required' Unauthorized: description: | Invalid, missing, or expired API key. Standard error envelope — read `message` for the human-readable reason. content: application/json: schema: type: object description: Standard error envelope. required: - statusCode - message properties: error: type: boolean example: true url: type: string format: uri example: https://api.zebratruth.ai/v1/whoami statusCode: type: integer example: 401 statusMessage: type: string example: Invalid API key message: type: string description: Canonical human-readable reason — pattern-match on this field. example: Invalid API key ForbiddenCoded: description: > The credential is valid but may not perform this action. `data.code` is one of `permission_not_granted`, `principal_forbidden_control_plane` (an API key called a dashboard-only action), `membership_not_active`, `entitlement_required`, `workspace_provisioning`, `workspace_deletion_scheduled`. content: application/json: schema: $ref: '#/components/schemas/CodedError' securitySchemes: bearerAuth: type: http scheme: bearer description: | API key starting with `zt_live_` (production) or `zt_test_` (sandbox). Get your key at https://developers.zebratruth.ai ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.