# List tiers

`GET https://evohub.io/api/v1/catalog/tiers`

Part of the [Catalog API](https://docs.evohub.io/catalog.md) reference · operationId `listTiers`.

The organization's tiers in use, most critical first, each with the
number of services in it. An organization starts with Tier 1 to
Tier 4.

Requires the `catalog:component:read` scope.

## Authorization

Any one of:

- `bearerKey`
- `headerKey`

Where:

- `bearerKey`: HTTP Bearer — An EvoHub API key (`evohub_…`) as a bearer token.
- `headerKey`: API key in the header `X-API-Key` — An EvoHub API key (`evohub_…`).

## Query parameters

- `archived` (string, value `true`): `true` to include archived tiers.

## Responses

### 200 — The tiers, most critical first.

Content type: `application/json`

Type: `object`

- `data` (array of Tier)
  - `id` (string)
  - `name` (string, example `Tier 1`)
  - `description` (string)
  - `rank` (integer): Its place in the order, 1 the most critical.
  - `color` (string, example `#d97706`)
  - `targets` (SLATargets)
    - `availability` (number, example `99.9`): A percentage above 0 and at most 100, up to 3 decimals.
    - `response` (object): Minutes to acknowledge, per On-Call severity (`critical`, `high`, `medium`, `low`, `info`), 1 to 525600.
      - Other keys: integer
    - `resolution` (object): Minutes to resolve, per severity.
      - Other keys: integer
    - `support_hours` (object)
      - `kind` (string, required, one of `24x7`, `business`)
      - `timezone` (string, example `Europe/Istanbul`)
      - `days` (array of integer): ISO weekdays, 1 is Monday.
      - `from` (string, example `09:00`)
      - `to` (string, example `18:00`)
    - `max_unowned_days` (integer, min 0, max 3650)
  - `version` (integer)
  - `archived_at` (string (date-time) | null)
  - `services` (integer): How many services are in it.
  - `created_at` (string (date-time))
  - `updated_at` (string (date-time))

### 401 — No API key was sent, or it is unknown, revoked or expired (`UNAUTHORIZED`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

### 403 — The key lacks a scope this endpoint needs (`FORBIDDEN`).

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

### 429 — Too many requests (`RATE_LIMITED`). Wait for `Retry-After` seconds.

Headers:

- `Retry-After` (integer): Seconds to wait before retrying.

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

### 500 — Something went wrong on EvoHub's side (`INTERNAL_ERROR`). Retry later.

Content type: `application/json`

Type: `Error`

- `error` (object, required)
  - `code` (string, required, example `NOT_FOUND`)
  - `message` (string, required, example `not found`)
  - `request_id` (string)

## Example request

```bash
curl -X GET 'https://evohub.io/api/v1/catalog/tiers' \
  -H 'Authorization: Bearer <TOKEN>'
```