# Severities — API reference

> Your incident severity ladder (SEV1…), fully customizable. REST endpoints with request and response fields, examples in curl, JavaScript, Python, Go and PHP, and an in-browser Try it console.

Source: https://upfour.io/docs/api/severities

[Developers](https://upfour.io/docs/api.md)/Alerting & response

Your incident severity ladder (SEV1…), fully customizable.

Base URL `https://app.upfour.io/v1`. Send your key as `Authorization: Bearer <key>`; every key acts on your real Company, so [test without paging anyone](https://upfour.io/docs/api/testing.md). New here? Start with the [quickstart](https://upfour.io/docs/api/quickstart.md). The examples read the key from `UP4_API_KEY`.

## Everyday

[GET **List severities** /severities](https://upfour.io/docs/api/severities/list-severities.md)