# Nesu API

- [Nesu API](https://docs.nesu.pt/index.md): Search Portuguese companies and retrieve their details with a simple JSON API.
- [Quickstart](https://docs.nesu.pt/quickstart.md): Make your first authenticated request and retrieve Portuguese company information by name or NIF.
- [Authentication](https://docs.nesu.pt/authentication.md): Create and manage your API keys and authenticate requests with a bearer token.
- [Limits and credits](https://docs.nesu.pt/limits.md): Understand shared rate limits, credit consumption, quota periods, and how to handle HTTP 429 responses.
- [Errors](https://docs.nesu.pt/errors.md): Read structured problem responses and handle authentication, validation, quota, and lookup failures.
- [Search companies](https://docs.nesu.pt/api-reference/search-companies.md): Find up to 20 Portuguese company directory entries by company name or NIF.
- [Get a company](https://docs.nesu.pt/api-reference/get-company.md): Retrieve a Portuguese company's address, activity, legal structure, and available debt brackets by NIF.
- [Get usage](https://docs.nesu.pt/api-reference/get-usage.md): Check your effective plan, purchased credits, period usage, API-key quota, and remaining rate-limit capacity.


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