---
title: "Changes to Create a TCP check"
method: POST
path: "/v1/checks/tcp"
---

# Changes to Create a TCP check

`POST /v1/checks/tcp`

> Every recorded change to this endpoint, newest first.

## Timeline

Changed in 2 of 4 revisions.

- **2026-08-12** `87d29dc7b4fe` — 20 breaking, 12 warning, 46 info
- **2026-08-05** `9e903da4f3da` — 2 info

## Changes

- **2026-08-12** `87d29dc7b4fe` — 20 breaking, 12 warning, 46 info
  - request body became required
  - for the `header` request parameter `x-checkly-account`, the format changed from no format to `uuid`
  - request property `request/assertions/items/comparison` was restricted to a list of enum values
  - the `name` request property's minLength was increased from `0` to `1`
  - the `privateLocations/items/` request property's minLength was increased from `0` to `1`
  - the `request/data` request property's minLength was increased from `0` to `1`
  - the `request/hostname` request property's minLength was increased from `0` to `1`
  - the `tags/items/` request property's minLength was increased from `0` to `1`
  - the `triggerIncident/serviceId` request property's minLength was increased from `0` to `1`
  - the `alertSettings/parallelRunFailureThreshold/percentage` request property type changed from `number` to `integer`
  - the `alertSettings/reminders/amount` request property type changed from `number` to `integer`
  - the `alertSettings/reminders/interval` request property type changed from `number` to `integer`
  - the `alertSettings/runBasedEscalation/failedRunThreshold` request property type changed from `number` to `integer`
  - the `alertSettings/timeBasedEscalation/minutesFailingThreshold` request property type changed from `number` to `integer`
  - the `triggerIncident/serviceId` request property format changed from no format to `uuid`
  - the response property `alertChannels/email/items/address` became optional for the status `201`
  - the response property `alertChannels/slack/items/url` became optional for the status `201`
  - the response property `alertChannels/sms/items/number` became optional for the status `201`
  - the response property `alertChannels/webhook/items/url` became optional for the status `201`
  - the `created_at` response's property format changed from `date` to `date-time` for status `201`
  - removed the optional property `attributes` from the response with the `401` status
  - removed the optional property `attributes` from the response with the `402` status
  - removed the optional property `attributes` from the response with the `429` status
  - added the new `CONTAINS` enum value to the `request/assertions/items/comparison` response property for the response status `201`
  - added the new `EQUALS` enum value to the `request/assertions/items/comparison` response property for the response status `201`
  - added the new `GREATER_THAN` enum value to the `request/assertions/items/comparison` response property for the response status `201`
  - added the new `IS_EMPTY` enum value to the `request/assertions/items/comparison` response property for the response status `201`
  - added the new `LESS_THAN` enum value to the `request/assertions/items/comparison` response property for the response status `201`
  - added the new `NOT_CONTAINS` enum value to the `request/assertions/items/comparison` response property for the response status `201`
  - added the new `NOT_EMPTY` enum value to the `request/assertions/items/comparison` response property for the response status `201`
  - added the new `NOT_EQUALS` enum value to the `request/assertions/items/comparison` response property for the response status `201`
  - added the new `undefined` enum value to the `runtimeId` response property for the response status `201`
  - added the new optional request property `checkType`
  - added the new optional request property `request/body`
  - added the new optional request property `request/url`
  - the `assertions` request property default value `` was added
  - the `locations` request property default value `` was added
  - the `tags` request property default value `` was added
  - the `activated` request property default value `true` was removed
  - added the new `CONTAINS` enum value to the request property `request/assertions/items/comparison`
  - …38 more
- **2026-08-05** `9e903da4f3da` — 2 info
  - the `degradedResponseTime` request property's max was increased from `5000.00` to `45000.00`
  - the `maxResponseTime` request property's max was increased from `5000.00` to `45000.00`

---

[Operation](https://skmtc.dev/checklyhq/apis/checkly-public-api/docs/v1/checks/tcp/post.md) · [API](https://skmtc.dev/checklyhq/apis/checkly-public-api.md) · [Page](https://skmtc.dev/checklyhq/apis/checkly-public-api/changes/v1/checks/tcp/post)