> ## Documentation Index
> Fetch the complete documentation index at: https://docs.boundaries.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

Every request needs a bearer token in the `Authorization` header:

```bash theme={null}
curl https://api.boundaries.io/unitedstates/rest/v1/public/boundary/zipcode?zipcode=20019 \
  -H "Authorization: Bearer <YOUR_API_KEY>"
```

Get a key at [boundaries-io.com](https://boundaries-io.com).


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