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All API requests must include an API key. In production, the supported and preferred approach is the
x-api-key HTTP header on every request.

Request header (preferred in production)

curl
curl -H "x-api-key: YOUR_API_KEY" https://api.finsider.io/api/v1/sec/submissions

For local development and quick experiments, you can also pass the same value as the apiKey query parameter when the header is missing or you need a quick URL-only test. Do not rely on query parameters in production: URLs are often logged, cached, or shared. The API evaluates the x-api-key header before considering apiKey in the query string.

Query parameter (development only)

Example URL
https://api.finsider.io/api/v1/sec/submissions?apiKey=YOUR_API_KEY

Security notice

Keep your API keys secure. Never share your API keys in client-side code or public repositories. Avoid apiKey in URLs outside local development—request logs and referrers can expose them.