---
title: "Text similarity over one finished census run (?frame=top1k|top10k|top100k, ?run=; default the latest): homepages near-identical across different domains (template families), and how far the visible text each AI identity was served sits from the browser's, in bands of a 64-bit SimHash (same, small, different, other page). Counts only, no site named. Signed crawlcheck-census-similarity."
method: GET
path: "/api/v1/census/similarity"
---

# Text similarity over one finished census run (?frame=top1k|top10k|top100k, ?run=; default the latest): homepages near-identical across different domains (template families), and how far the visible text each AI identity was served sits from the browser's, in bands of a 64-bit SimHash (same, small, different, other page). Counts only, no site named. Signed crawlcheck-census-similarity.

`GET /api/v1/census/similarity`

## Request

- Base URL: `https://crawlcheck.io`
- URL: `https://crawlcheck.io/api/v1/census/similarity`
- Auth: none required

## Query parameters

- `frame` string
- `run` integer

## Response `200`

crawlcheck-census-similarity

- object, nullable
  - `kind` string, nullable
  - `v` number, nullable
  - `frame` string, nullable
  - `run` number, nullable
  - `sites` number, nullable
  - `fingerprinted` number, nullable
  - `families` object, nullable
    - `families` number, nullable
    - `sites_in_families` number, nullable
    - `size_distribution` object, nullable
      - `2` number, nullable
      - `3_to_9` number, nullable
      - `10_plus` number, nullable
    - `largest` number[], nullable
    - `max_bits` number, nullable
  - `parity` object, nullable
    - `gptbot` object, nullable
      - `compared` number, nullable
      - `same` number, nullable
      - `small` number, nullable
      - `different` number, nullable
      - `other_page` number, nullable
  - `sha256` unknown
  - `signature` object, nullable
    - `v` number, nullable
    - `alg` string, nullable
    - `kid` unknown
    - `sig` unknown

## Other responses

- `400`: bad frame
- `404`: no finished run

---

[API](https://skmtc.dev/crawlcheck/apis/crawlcheck-api.md) · [All operations](https://skmtc.dev/crawlcheck/apis/crawlcheck-api/llms.txt) · [OpenAPI document](https://skmtc.dev/crawlcheck/apis/crawlcheck-api/revisions/57acbd6d4489?raw)