---
title: "Changes to Preview Signal"
method: POST
path: "/v1/signals/preview"
---

# Changes to Preview Signal

`POST /v1/signals/preview`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 5 of 37 revisions.

- **2026-10-08** `16f692efb3db`: 1 info
- **2026-09-30** `451748979321`: 1 info
- **2026-09-18** `5906bed561be`: 1 info
- **2026-09-11** `242d6cb1e182`: 2 breaking
- **2026-09-09** `d037d17aecd4`: 1 info

## Changes

- **2026-10-08** `16f692efb3db`: 1 info
  - added the optional property `unavailable_reason` to the response with the `200` status
- **2026-09-30** `451748979321`: 1 info
  - added the new `linkedin_watched_engagement` enum value to the request property `search_filters/propertyNames/`
- **2026-09-18** `5906bed561be`: 1 info
  - added the new `tech_min_confidence` enum value to the request property `search_filters/propertyNames/`
- **2026-09-11** `242d6cb1e182`: 2 breaking
  - removed the enum value `has_business_email` of the request property `search_filters/propertyNames/`
  - removed the enum value `has_email` of the request property `search_filters/propertyNames/`
- **2026-09-09** `d037d17aecd4`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/topo/apis/topo-public-api/docs/v1/signals/preview/post.md) - [API](https://skmtc.dev/topo/apis/topo-public-api.md) - [Page](https://skmtc.dev/topo/apis/topo-public-api/changes/v1/signals/preview/post)