---
title: "List a cycler's service history"
method: GET
path: "/cyclers/{cycler_id}/service_events"
tags: ["Cyclers"]
---

# List a cycler's service history

`GET /cyclers/{cycler_id}/service_events`

## Request

- Base URL: `https://api.ionworks.com`
- URL: `https://api.ionworks.com/cyclers/{cycler_id}/service_events`
- Auth: none declared

List the cycler's service events, most recently created first.

An event with a null ``performed_at`` is the cycler's current service; at
most one can exist. Completing a ``calibration`` event is what advances the
cycler's ``last_calibrated_at`` and therefore its ``calibration_due_at``.

## Path parameters

- `cycler_id` string, uuid, required

## Query parameters

- `limit` integer
- `offset` integer

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

## Changes

- **2026-09-30** `ea3d377fec1a`: 1 breaking
  - for the `path` request parameter `cycler_id`, the format changed from no format to `uuid`

[Operation history](https://skmtc.dev/ionworks/apis/ionworks-api/changes/cyclers/:cycler_id/service_events/get.md)

---

[API](https://skmtc.dev/ionworks/apis/ionworks-api.md) - [All operations](https://skmtc.dev/ionworks/apis/ionworks-api/llms.txt) - [OpenAPI document](https://skmtc.dev/ionworks/apis/ionworks-api/revisions/abebbbc5f60a?raw)