---
title: "List the topics X groups communities under"
method: GET
path: "/x/communities/topics"
tags: ["Communities"]
---

# List the topics X groups communities under

`GET /x/communities/topics`

## Request

- Base URL: `https://xquik.com/api/v1`
- URL: `https://xquik.com/api/v1/x/communities/topics`
- Auth: one of:
  - API key in header `x-api-key`
  - HTTP bearer
  - none

Returns the community topics with their subtopics. Pass an ID as topicId, or a name as topic, to /x/communities/popular. Each top-level topic costs 1 credit, its subtopics included.

## Query parameters

- `limit` integer
- `fields` string
- `omit` string

## Response `200`

Community topics with their subtopics

- object
  - `topics` CommunityTopic[], required: Topics in X's order
    - `id` string, required: Topic ID. Pass it as topicId to /x/communities/popular.
    - `name` string, required: Topic name, which topic on /x/communities/popular takes
    - `subtopics` object[], required: Narrower topics inside this topic
      - `id` string, required: Subtopic ID, which topicId also takes
      - `name` string, required: Subtopic name, which topic also takes
  - `count` integer, required: Top-level topics returned & charged
  - `message` string: What to do next. Present only when X lists no topic.

## Other responses

- `400`: Invalid input. A value past its maxLength gets this answer, & the message names the field & its limit.
- `401`: Non-MPP paid reads require Bearer authentication. Without credentials, the answer offers a guest checkout but does not create it. Invalid credentials return a plain error. Confirm before using any offered action.
- `402`: Payment required. MPP reads include `WWW-Authenticate`. Authenticated reads include balances, plus checkout when the key can open it. A key that reads only gets the account page instead. A failed request never creates checkout. A caller on a plan gets top-up only, plus `credits_renew_at` when the plan renews. Guest keys offer top-up.
- `424`: Dependency unavailable, unauthorized, or limited. Default v1 uses 502. Best-practice responses use 424 for transparent dependency failures. Search answers 424 `search_unavailable` when X fails the query itself, or when its filters matched none of the last 3,000 posts read. The message says how far back the search read.
- `429`: Too many requests right now. Each user gets 500 reads a second. Each minute allows 120 writes & 60 deletes. `x_api_rate_limited` means X limits this read for now. Neither answer costs anything. Wait for the seconds in `Retry-After`, then retry.
- `502`: Dependency unavailable, unauthorized, or limited. Default v1 uses 502. Best-practice responses use 424 for transparent dependency failures. Search answers 424 `search_unavailable` when X fails the query itself, or when its filters matched none of the last 3,000 posts read. The message says how far back the search read.
- `503`: Retry x_api_unavailable after Retry-After. With X-Xquik-Busy, retry until your deadline.

## Changes

- **2026-10-21** `245194cd4ea7`: 14 warning
  - added the new `topup_in_progress` enum value to the `allOf[#/components/schemas/Error]/error/oneOf[subschema #1: LegacyErrorCode]/` response property for the response status `429`
  - added the new `topup_in_progress` enum value to the `allOf[#/components/schemas/Error]/error/oneOf[subschema #2: StructuredError]/code` response property for the response status `429`
  - added the new `topup_in_progress` enum value to the `error/oneOf[subschema #1: LegacyErrorCode]/` response property for the response status `400`
  - added the new `topup_in_progress` enum value to the `error/oneOf[subschema #1: LegacyErrorCode]/` response property for the response status `424`
  - …10 more
- **2026-10-18** `d17988b4a85d`: 1 breaking, 6 info
  - added `#/components/schemas/AccountPagePaymentRequired` to the response body `oneOf` list for the response status `402`
  - the response property `oneOf[#/components/schemas/AuthenticatedPaymentRequired]/payment_options` became required for the status `402`
  - the response property `oneOf[#/components/schemas/AuthenticatedPaymentRequired]/top_up_endpoint` became required for the status `402`
  - the response property `oneOf[#/components/schemas/AuthenticatedPaymentRequired]/top_up_url` became required for the status `402`
  - …3 more
- …earlier changes not shown

[Operation history](https://skmtc.dev/xquik-dev/apis/xquik-api/changes/x/communities/topics/get.md)

---

[API](https://skmtc.dev/xquik-dev/apis/xquik-api.md) · [All operations](https://skmtc.dev/xquik-dev/apis/xquik-api/llms.txt) · [OpenAPI document](https://skmtc.dev/xquik-dev/apis/xquik-api/revisions/ef03679f1918?raw)