---
title: "Changes to Censorship risk heuristic (experimental)"
method: POST
path: "/hydra/v1/predict"
---

# Changes to Censorship risk heuristic (experimental)

`POST /hydra/v1/predict`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 4 of 21 revisions.

- **2026-10-24** `491e71a343b6`: 3 breaking, 2 warning, 3 info
- **2026-10-19** `c9aabd44d077`: 2 breaking, 2 warning, 5 info
- **2026-10-19** `17add6e42e9c`: 3 warning, 9 info
- **2026-04-08** `a46514573a08`: 5 breaking, 1 info

## Changes

- **2026-10-24** `491e71a343b6`: 3 breaking, 2 warning, 3 info
  - the response property `mlPrediction/blockedProbability` became nullable for the status `200`
  - the response property `mlPrediction/confidence` became nullable for the status `200`
  - the response property `mlPrediction/recommendation` became nullable for the status `200`
  - added the new `unavailable` enum value to the `mlPrediction/source` response property for the response status `200`
  - added the new `withheld` enum value to the `mlPrediction/source` response property for the response status `200`
  - added the optional property `mlPrediction/note` to the response with the `200` status
  - removed the `local_rule:country_risk_tier` enum value from the `mlPrediction/source` response property for the response status `200`
  - removed the `local_rule:known_blocked_list` enum value from the `mlPrediction/source` response property for the response status `200`
- **2026-10-19** `c9aabd44d077`: 2 breaking, 2 warning, 5 info
  - the `error` response's property type changed from `string` to `object` for status `400`
  - the `error` response's property type changed from `string` to `object` for status `401`
  - removed the optional property `message` from the response with the `400` status
  - removed the optional property `message` from the response with the `401` status
  - added the non-success response with the status `429`
  - added the required property `error/code` to the response with the `400` status
  - added the required property `error/code` to the response with the `401` status
  - added the required property `error/message` to the response with the `400` status
  - added the required property `error/message` to the response with the `401` status
- **2026-10-19** `17add6e42e9c`: 3 warning, 9 info
  - added the new `default_score` enum value to the `factors/items/factor` response property for the response status `200`
  - added the new `fallback_score` enum value to the `factors/items/factor` response property for the response status `200`
  - added the new `ooni_anomaly_rate` enum value to the `factors/items/factor` response property for the response status `200`
  - added the optional property `dataSource` to the response with the `200` status
  - added the optional property `method` to the response with the `200` status
  - added the optional property `mlPrediction` to the response with the `200` status
  - added the optional property `note` to the response with the `200` status
  - added the optional property `onsetTiming` to the response with the `200` status
  - added the optional property `trendModeled` to the response with the `200` status
  - added the optional property `validated` to the response with the `200` status
  - removed the `decreasing` enum value from the `trend` response property for the response status `200`
  - removed the `increasing` enum value from the `trend` response property for the response status `200`
- **2026-04-08** `a46514573a08`: 5 breaking, 1 info
  - the response property `factors` became optional for the status `200`
  - the response property `message` became optional for the status `400`
  - the response property `message` became optional for the status `401`
  - the response property `modelVersion` became optional for the status `200`
  - the response property `timestamp` became optional for the status `200`
  - the endpoint scheme security `ApiKeyAuth` was added to the API

---

[Operation](https://skmtc.dev/voidly/apis/voidly-api/docs/hydra/v1/predict/post.md) - [API](https://skmtc.dev/voidly/apis/voidly-api.md) - [Page](https://skmtc.dev/voidly/apis/voidly-api/changes/hydra/v1/predict/post)