> ## Documentation Index > Fetch the complete documentation index at: https://docs.thebuoy.app/llms.txt > Use this file to discover all available pages before exploring further. # Get historical readings for a buoy > Get paginated historical readings for a buoy. Supports filtering by date range. **Pagination:** Default 20 per page, minimum 1, maximum 100 per page. ## OpenAPI ````yaml /api-reference/openapi.json get /buoys/{buoy_id}/readings openapi: 3.0.3 info: title: The Buoy API version: 2.0.0 description: >- **The Buoy API** — programmatic access to ocean wave buoys on The Surf Kit platform. All operations are **read-only** (`GET`). Data includes live and historical readings, geographic filters, chart time series, and **`GET /conditions`** (combined forecast, buoy reading, and tide for a point). ## Authentication Pass your API key in the `Authorization` header: ``` Authorization: Bearer YOUR_API_KEY ``` `GET /buoys/search` and `GET /buoys/nearest` are public (no key required). ## Rate limiting Responses include `X-RateLimit-*` headers. Exceeding your hourly quota returns `429 Too Many Requests`. contact: name: API Support email: thomas@thebuoy.app license: name: Proprietary servers: - url: https://api.thebuoy.app/v2 description: Production server (V2) - url: http://localhost:3000/api/v2 description: Development server (V2) security: - ApiKeyAuth: [] tags: - name: Buoys description: Real-time ocean buoy data - name: Satellite Passes description: >- Satellite altimeter passes over virtual buoys, and the missions behind them - name: Conditions description: All-in-one conditions endpoint paths: /buoys/{buoy_id}/readings: get: tags: - Buoys summary: Get historical readings for a buoy description: > Get paginated historical readings for a buoy. Supports filtering by date range. **Pagination:** Default 20 per page, minimum 1, maximum 100 per page. operationId: getBuoyReadings parameters: - name: buoy_id in: path required: true schema: type: integer - name: start_date in: query description: Start date in ISO 8601 format (YYYY-MM-DDTHH:MM:SSZ) schema: type: string format: date-time - name: end_date in: query description: End date in ISO 8601 format (YYYY-MM-DDTHH:MM:SSZ) schema: type: string format: date-time - name: date in: query description: >- Filter by single date (YYYY-MM-DD). Alternative to start_date/end_date. schema: type: string format: date - name: timestamp in: query description: >- Filter by unix timestamp (seconds). Returns readings within a 3-hour window. schema: type: integer - name: order in: query description: Sort order schema: type: string enum: - asc - desc default: desc - name: page in: query schema: type: integer default: 1 - name: per_page in: query schema: type: integer default: 20 minimum: 1 maximum: 100 responses: '200': description: Successful response headers: X-RateLimit-Limit: $ref: '#/components/headers/XRateLimitLimit' X-RateLimit-Remaining: $ref: '#/components/headers/XRateLimitRemaining' X-RateLimit-Reset: $ref: '#/components/headers/XRateLimitReset' content: application/json: schema: type: object properties: status: type: string example: success data: type: object properties: buoy: type: object properties: name: type: string lat: type: number lng: type: number source: type: string description: >- Buoy data source (e.g., "Candhis", "Meteo France", "Sofar Ocean") dtz: type: string description: Data timezone identifier readings: type: array items: $ref: '#/components/schemas/BuoyReading' count: type: integer meta: allOf: - $ref: '#/components/schemas/PaginationMeta' - type: object properties: date_range: type: object properties: start: type: string format: date-time end: type: string format: date-time '401': $ref: '#/components/responses/Unauthorized' '404': $ref: '#/components/responses/NotFound' '429': $ref: '#/components/responses/RateLimitExceeded' security: - ApiKeyAuth: [] components: headers: XRateLimitLimit: schema: type: integer description: Maximum requests allowed per hour example: 1000 description: Maximum requests allowed per hour XRateLimitRemaining: schema: type: integer description: Requests remaining in current hour example: 987 description: Requests remaining in current hour XRateLimitReset: schema: type: integer description: Unix timestamp when rate limit resets example: 1735326000 description: Unix timestamp when rate limit resets schemas: BuoyReading: type: object description: Individual buoy reading properties: id: type: integer uuid: type: string description: Unique identifier for the reading significient_height: type: number format: float description: Significant wave height in meters maximum_height: type: number format: float description: Maximum wave height in meters period: type: number format: float description: Wave period in seconds time: type: string format: date-time description: Reading timestamp water_temperature: type: number format: float description: Water temperature in Celsius direction: type: integer description: Wave direction in degrees (0-360) direction_compass: type: string description: Compass direction (e.g., "SW", "NW") unit: type: string description: Unit abbreviation (e.g., "m") energy_per_wave: type: number format: float description: Energy per wave in kilojoules PaginationMeta: type: object description: Pagination metadata included in list responses properties: page: type: integer description: Current page number example: 1 per_page: type: integer description: Number of items per page example: 50 total_pages: type: integer description: Total number of pages example: 5 timestamp: type: string format: date-time description: Response timestamp in ISO 8601 format ErrorResponse: type: object description: Standardized error response format for V2 API properties: error: type: string description: >- Error code (e.g., "unauthorized", "bad_request", "resource_not_found") example: unauthorized message: type: string description: Human-readable error message example: Invalid API key details: type: object description: Additional error details (optional, varies by error type) responses: Unauthorized: description: Invalid or missing API key (401 Unauthorized) content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: unauthorized message: Invalid API key timestamp: '2025-12-27T14:30:00Z' request_id: 550e8400-e29b-41d4-a716-446655440000 NotFound: description: Resource not found (404 Not Found) content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: resource_not_found message: Couldn't find Spot with 'id'=999 timestamp: '2025-12-27T14:30:00Z' request_id: 550e8400-e29b-41d4-a716-446655440000 RateLimitExceeded: description: Rate limit exceeded (429 Too Many Requests) headers: X-RateLimit-Limit: schema: type: integer description: Maximum requests allowed per hour example: 1000 X-RateLimit-Remaining: schema: type: integer description: Requests remaining in current hour example: 0 X-RateLimit-Reset: schema: type: integer description: Unix timestamp when rate limit resets (top of next hour) example: 1735326000 Retry-After: schema: type: integer description: Seconds to wait before retrying example: 3600 content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: rate_limit_exceeded message: You have exceeded 1000 requests per hour timestamp: '2025-12-27T14:30:00Z' request_id: 550e8400-e29b-41d4-a716-446655440000 securitySchemes: ApiKeyAuth: type: http scheme: bearer bearerFormat: API Key description: > API key authentication. Pass your API key as a Bearer token in the Authorization header. Format: `Authorization: Bearer YOUR_API_KEY` Alternative: Pass as query parameter `?api_key=YOUR_API_KEY` **Security:** API keys are stored as BCrypt hashes (never plain text). Only the hash is stored in the database. ````