> ## Documentation Index > Fetch the complete documentation index at: https://api-docs.useopenwrench.com/llms.txt > Use this file to discover all available pages before exploring further. # Count walkthroughs > Count of walkthroughs matching the given filters. Filtering: every query parameter other than the pagination parameters is passed to the entity's filter layer and matched against its indexed columns (multi-value filters are comma-separated strings); the per-entity column names are not exhaustively documented here. Filters are combined with the tenant-security filters derived from the API key. ## OpenAPI ````yaml /openapi/buyer.json get /v1/buyer/site_survey/walkthroughs/count_by openapi: 3.1.0 info: title: OpenWrench Buyer API version: 1.0.0 description: >- External REST API for OpenWrench buyers (facilities-management side). Generated from the application source (Play routes, controllers and models). ## Authentication Every request must carry a buyer API key in the `X-API-KEY` header. The key resolves to a buyer contact, and all reads/writes are tenant-scoped to that contact's buyer company (plus, on several endpoints, role-based location/brand restrictions). Endpoints under `/v1/buyer/super_admin/...` (and a few others noted per-operation) additionally require the key's contact to be a buyer super admin. ## Rate limiting 10 requests per 20-second window per API key; requests beyond that receive **429**. A handful of operations noted per-operation bypass the rate limiter. ## Response envelope Single-entity responses: `{ "type": "", "data": { ... }, "status": "ok" }`. List responses: `{ "type": "", "data": [ ... ], "count": , "status": "ok" }`. count_by responses: `{ "type": "CountBy", "data": , "status": "ok" }`. Errors: `{ "message": "...", "type": "", "status": "error", "traceId": "..." }` — 401 missing/invalid key, 400 bad input, 404 not found, 429 rate limit. ## Pagination & filtering List endpoints accept `offset`, `limit` (default 10, max 25 — the locations list clamps to 10), `sort_by` and `order` (asc|desc). Every other query parameter is treated as a filter and matched against the entity's indexed columns (multi-value filters are comma-separated strings); these are combined with the tenant-security filters derived from the API key. Timestamps are ISO 8601 strings unless noted otherwise. ## Date formats Date-time fields serialize as strings in one of two shapes depending on the underlying type: ISO 8601 with offset (e.g. `2026-08-14T13:05:22.000-07:00`) for most timestamps, or `yyyy-MM-dd HH:mm:ss.S` (space-separated, no offset) for database timestamp fields. Plain dates are `yyyy-MM-dd`. When sending date-times, ISO 8601 is accepted. ## Required headers Every request must carry BOTH `X-API-KEY` (your API key) and `OW-KEY` (the OpenWrench shared secret issued with it). Requests missing either return 401. servers: - url: https://api.useopenwrench.com/api/external security: - ApiKeyAuth: [] OwKeyAuth: [] tags: - name: Ping - name: Me - name: Locations - name: Regions - name: Asset Types - name: Asset Meters - name: Assets - name: Asset Labels description: Read the asset label catalog and replace the labels applied to an asset. - name: Asset Models - name: Work Orders - name: Work Order Notes - name: Work Order Labels description: >- Read your work order label catalog and replace the labels applied to a work order. - name: Service Calls - name: Site Survey Walkthroughs - name: Invoices - name: Proposals - name: Files - name: Planned Maintenance - name: Currency Exchange - name: Supplier Network - name: User Provisioning paths: /v1/buyer/site_survey/walkthroughs/count_by: get: tags: - Site Survey Walkthroughs summary: Count walkthroughs description: >- Count of walkthroughs matching the given filters. Filtering: every query parameter other than the pagination parameters is passed to the entity's filter layer and matched against its indexed columns (multi-value filters are comma-separated strings); the per-entity column names are not exhaustively documented here. Filters are combined with the tenant-security filters derived from the API key. operationId: countWalkthroughs responses: '200': description: Success. content: application/json: schema: $ref: '#/components/schemas/CountResponse' '400': description: >- Bad input, parse failure, or the API key's contact could not be resolved. content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Missing or invalid X-API-KEY. content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Rate limit exceeded (10 requests per 20-second window per key). content: application/json: schema: $ref: '#/components/schemas/Error' components: schemas: CountResponse: type: object properties: type: type: string description: Always "CountBy". data: type: integer description: The count. status: type: string enum: - ok required: - type - data - status description: 'Envelope for count_by endpoints: data is a plain integer count.' Error: type: object properties: message: type: string type: type: string description: >- Exception type, e.g. unauthorizedException, NotFoundException, BadRequestException, ParseException, InvalidInputDataException, ConflictException, UnexpectedException. status: type: string enum: - error traceId: type: string description: >- Trace id (a random 11-char alphanumeric string when no explicit trace applies). required: - message - type - status - traceId description: >- Standard error envelope. 401 = missing/invalid API key, 400 = bad input, 404 = not found, 429 = rate limit exceeded. securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-KEY OwKeyAuth: type: apiKey in: header name: OW-KEY description: >- OpenWrench shared secret. Required on every request alongside X-API-KEY; issued together with your API key. ````