> ## Documentation Index > Fetch the complete documentation index at: https://docs.nordicfinancialnews.com/llms.txt > Use this file to discover all available pages before exploring further. # List Sources > Returns a paginated list of enabled news sources, ordered alphabetically by name. Use source IDs to filter articles and stories via the `sources` parameter on the articles and stories list endpoints. ## OpenAPI ````yaml https://nordicfinancialnews.com/openapi/v1/openapi.yaml get /api/v1/sources openapi: 3.0.1 info: title: Nordic Financial News API version: v1.0 description: > REST API for Nordic financial news. Each article is summarized in English (headline, short summary, and key points) with the original-language article linked via `article_url`. The full article body stays at the source. ## Authentication All endpoints require Bearer token authentication using an API key. Include the API key in the Authorization header: ``` Authorization: Bearer YOUR_API_KEY ``` ## Rate Limiting The API enforces per-hour rate limits based on your plan: - **Free**: 100 requests/hour - **Pro**: 5,000 requests/hour Rate limit information is included in response headers: - `X-RateLimit-Limit`: Maximum requests per hour - `X-RateLimit-Remaining`: Requests remaining - `X-RateLimit-Reset`: Seconds until limit resets - `X-RateLimit-Policy`: Human-readable rate limit policy (e.g. `5000 per hour; token bucket`) The `/health` endpoint is exempt from rate limiting and does not return rate limit headers. ## Monthly Usage Limits Each API key has a monthly request allowance based on your plan: - **Free**: 50 requests/month - **Plus**: 10,000 requests/month - **Pro**: 50,000 requests/month Monthly usage information is included in response headers: - `X-Monthly-Limit`: Maximum requests per month - `X-Monthly-Remaining`: Requests remaining this month - `X-Monthly-Reset`: ISO 8601 timestamp when the limit resets (end of month) When the monthly limit is exceeded, the API returns `429 Too Many Requests` with a `Retry-After` header. ## Caching The API supports HTTP caching with ETags. Include the `If-None-Match` header with the ETag from a previous response to receive a 304 Not Modified response if the data hasn't changed. ## Pagination List endpoints support cursor-based pagination. Use the `cursor` parameter with the value from `pagination.next_cursor` in the response to fetch the next page. Paginated responses also include a `Link` header with `rel="next"` pointing to the next page URL. ## Error Handling Errors follow the RFC 9457 Problem Details format with appropriate HTTP status codes. contact: name: API Support email: hello@nordicfinancialnews.com servers: - url: https://nordicfinancialnews.com description: Production server security: [] paths: /api/v1/sources: get: tags: - Sources summary: List Sources description: >- Returns a paginated list of enabled news sources, ordered alphabetically by name. Use source IDs to filter articles and stories via the `sources` parameter on the articles and stories list endpoints. parameters: - name: limit in: query required: false description: Number of sources to return per page (default 25, max 100). example: 25 schema: type: integer - name: cursor in: query required: false description: Opaque pagination cursor from a previous response. schema: type: string - name: fields in: query required: false description: >- Comma-separated list of fields to include. Available fields: `id`, `name`, `domain`, `country`. example: id,name,domain schema: type: string - name: If-None-Match in: header required: false description: >- ETag value from a previous response. Returns `304 Not Modified` if data has not changed. schema: type: string responses: '200': description: Sources retrieved content: application/json: examples: basic_response: value: sources: - id: abc123def456 name: Dagens Industri domain: di.se country: SE - id: ghi789jkl012 name: Dagens Nyheter domain: dn.se country: SE pagination: count: 2 next_cursor: null schema: type: object properties: sources: type: array items: $ref: '#/components/schemas/SourceSummary' pagination: type: object properties: count: type: integer example: 25 next_cursor: type: string nullable: true '401': description: Unauthorized content: application/json: examples: unauthorized: value: type: https://docs.nordicfinancialnews.com/problems/auth-invalid title: Unauthorized status: 401 detail: Missing or invalid API key instance: urn:request:abc123 schema: $ref: '#/components/schemas/problem_details' security: - bearer_auth: [] components: schemas: SourceSummary: type: object required: - id - name - domain properties: id: type: string description: Unique source identifier example: abc123def456 name: type: string description: Source display name example: Dagens Industri domain: type: string description: Primary domain of the source example: di.se country: type: string nullable: true description: Country code (ISO 3166-1 alpha-2) example: SE problem_details: type: object required: - type - title - status - detail - instance properties: type: type: string description: URI that identifies the problem type title: type: string description: Short human-readable summary status: type: integer description: HTTP status code detail: type: string description: Human-readable explanation instance: type: string description: URI that identifies the specific occurrence securitySchemes: bearer_auth: type: http scheme: bearer bearerFormat: API Key description: API Key authentication using Bearer token ````