Frase Clusters API
Topic clusters that organize content and briefs by theme
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OpenAPI Specification
openapi: 3.2.0
info:
title: Frase Clusters API
version: 1.0.0
description: 'The Frase API provides programmatic access to your SEO content platform. Use it to manage content, research, audits, AI visibility tracking, and more. ## Authentication
All API requests require authentication using an API key. Include your key in the `X-API-KEY` header:
```
X-API-KEY: sk_live_your_api_key_here
```
For legacy compatibility, the `token` header is also supported. ## Rate Limits
Three independent limits apply, each with its own headers and error code. Headers are returned on `429` responses, not on successful ones. **Per-minute burst** - 60/min on trial and Starter, 120 Professional, 300 Scale, 1,000 Enterprise. Error code `rate_limit_exceeded`. - `X-RateLimit-Limit`, `X-RateLimit-Remaining`, `X-RateLimit-Reset` (epoch seconds)
**Sustained hourly ceiling** - 2,000/hour trial, 3,000 Starter, 5,000 Professional, 15,000 Scale, 50,000 Enterprise. Error code `hourly_limit_exceeded`. - `X-RateLimit-Hourly-Limit`, `X-RateLimit-Hourly-Remaining`, `X-RateLimit-Hourly-Reset` (epoch seconds)
**Monthly request budget** - error code `monthly_budget_exceeded`, headers `X-Monthly-Limit`, `X-Monthly-Used`, `X-Monthly-Remaining`. Every `429` carries `Retry-After` in seconds. On the hourly ceiling this can be up to 3,600, so clients should honour it rather than retrying on a short fixed backoff - a retry sooner than `Retry-After` cannot succeed. ## Errors
The API uses standard HTTP status codes and returns errors in a consistent format:
```json
{
"error": {
"type": "authentication_error",
"code": "invalid_api_key",
"message": "Invalid API key provided.",
"doc_url": "https://docs.frase.io/api/errors#invalid_api_key"
}
}
```
## Changelog
Breaking changes are listed here, newest first. "Breaking" means a field that was always present with a value can now be `null`, or an existing value now means something different — not that a field was removed or renamed. Additive fields are not listed. ### 2026-08-31 — Fact `sources[]` may omit `url`, and minted facts default to `approved`
- `GET /briefs/{id}/facts`, `PATCH /briefs/{id}/facts/{factId}` → a `sources[]` entry may now carry only `title`, with no `url` or `domain`. Research names a publisher far more often than it captures a link (793 of 801 plan-evidence items in production), and those names were previously discarded rather than returned. Read `url` defensively. - `GET /briefs/{id}/facts` → `approval` on a newly minted fact is now `approved` rather than `pending`. A client polling for `pending` facts to review will see far fewer; rejection is unchanged and remains permanent. Facts the writer asserted in its own output (`provenance: generated`) are still minted `pending`. ### 2026-08-24 — Content Guard''s hasPublishedUrl is now recoverability, not the stored URL
- `GET /content/{id}/monitoring` → `hasPublishedUrl`: was a judgment on the STORED URL (false for a relative path even when the page was live). It now answers "could Guard watch this article right now" — the stored URL when absolute, or an address the server recovers (CMS inventory; FraseCMS re-derivation from current settings when a live published post exists). `true` no longer implies the stored URL itself is absolute, and a FraseCMS article published before domain setup flips to `true` when setup finishes, with no re-publish. It remains exactly the condition enabling enforces. - `publishedUrlIssue` is now the RESIDUAL after recovery failed, not a raw-column classification — "not_absolute" can also mean the FraseCMS post is not live or FraseCMS is disabled for the site. - `POST /content/{id}/publish` → `url` (frase_cms): now derived from the site''s current CMS settings rather than the adapter''s host-of-the-moment value; the same URL is stored on the content row and sent in the content.published webhook.'
contact:
name: Frase Support
url: https://frase.io
email: support@frase.io
license:
name: Proprietary
url: https://www.frase.io/company/terms
servers:
- url: https://next.frase.io/api/v1
description: Production
- url: /api/v1
description: This host
security:
- ApiKeyAuth: []
- BearerAuth: []
tags:
- name: Clusters
description: Topic clusters that organize content and briefs by theme
paths:
/clusters:
get:
operationId: listClusters
summary: List topic clusters
description: Retrieve the organization's topic clusters, optionally scoped to a site.
tags:
- Clusters
security:
- ApiKeyAuth: []
parameters:
- name: page
in: query
schema:
type: integer
default: 1
- name: page_size
in: query
schema:
type: integer
default: 20
maximum: 100
- name: site_id
in: query
required: false
description: Filter to a single site (org-wide clusters are always included)
schema:
type: string
format: uuid
responses:
'200':
description: List of clusters
content:
application/json:
schema:
type: object
properties:
data:
type: array
items:
type: object
properties:
id:
type: string
format: uuid
name:
type: string
description:
type: string
nullable: true
color:
type: string
nullable: true
pillar_content_id:
type: string
format: uuid
nullable: true
pillar_title:
type: string
nullable: true
site_id:
type: string
format: uuid
nullable: true
description: The site this cluster is scoped to, or null for an org-wide cluster.
seed_keywords:
type: array
items:
type: string
nullable: true
content_count:
type: integer
brief_count:
type: integer
created_at:
type: string
format: date-time
updated_at:
type: string
format: date-time
pagination:
$ref: '#/components/schemas/Pagination'
request_id:
type: string
'400':
$ref: '#/components/responses/ValidationError'
'401':
$ref: '#/components/responses/Unauthorized'
'429':
description: Rate limited, or the org's monthly brief limit blocked minting the refreshed brief (only the FIRST supersession of a brief is billing-exempt; repeats meter normally)
post:
operationId: createCluster
summary: Create a topic cluster
description: Create a topic cluster. Omit `site_id` for an org-wide cluster, or pass a site your organization owns to scope it. A `site_id` the org does not own returns 404.
tags:
- Clusters
security:
- ApiKeyAuth: []
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- name
properties:
name:
type: string
description: Required. Cluster name.
description:
type: string
description: Optional summary of the cluster's topic.
color:
type: string
description: Optional display color.
seed_keywords:
type: array
items:
type: string
description: Optional seed keywords for the cluster.
site_id:
type: string
format: uuid
description: Optional. Scope the cluster to a site the org owns; omit for an org-wide cluster.
responses:
'201':
description: Cluster created
content:
application/json:
schema:
type: object
properties:
data:
type: object
properties:
id:
type: string
format: uuid
name:
type: string
description:
type: string
nullable: true
color:
type: string
nullable: true
site_id:
type: string
format: uuid
nullable: true
description: Echoes the scope just written; null for an org-wide cluster.
seed_keywords:
type: array
items:
type: string
nullable: true
created_at:
type: string
format: date-time
request_id:
type: string
'400':
$ref: '#/components/responses/ValidationError'
'401':
$ref: '#/components/responses/Unauthorized'
'404':
$ref: '#/components/responses/NotFound'
'429':
description: Rate limited, or the org's monthly brief limit blocked minting the refreshed brief (only the FIRST supersession of a brief is billing-exempt; repeats meter normally)
/clusters/suggest:
post:
operationId: suggestClusters
summary: Suggest new topic clusters for a site
description: Propose new topic clusters for a site, reasoning from the org's existing cluster taxonomy plus unclustered brief topics and content titles as demand signals. Returns an empty array when the site has no signals to reason from.
tags:
- Clusters
security:
- ApiKeyAuth: []
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- site_id
properties:
site_id:
type: string
format: uuid
description: Required. The site to suggest clusters for.
responses:
'200':
description: Ranked cluster suggestions
content:
application/json:
schema:
type: object
properties:
data:
type: array
items:
type: object
properties:
name:
type: string
description: Proposed cluster name.
pillar_topic:
type: string
description: The pillar topic the cluster would be built around.
suggested_content:
type: array
items:
type: string
description: Suggested supporting article topics.
confidence:
type: number
description: Model confidence in the suggestion, 0-1.
request_id:
type: string
'400':
$ref: '#/components/responses/ValidationError'
'401':
$ref: '#/components/responses/Unauthorized'
'404':
$ref: '#/components/responses/NotFound'
'429':
description: Rate limited, or the org's monthly brief limit blocked minting the refreshed brief (only the FIRST supersession of a brief is billing-exempt; repeats meter normally)
/clusters/{id}:
get:
operationId: getCluster
summary: Get a topic cluster
description: Retrieve a single cluster with its assigned content and briefs.
tags:
- Clusters
security:
- ApiKeyAuth: []
parameters:
- name: id
in: path
required: true
description: Cluster ID
schema:
type: string
format: uuid
responses:
'200':
description: Cluster detail
content:
application/json:
schema:
type: object
properties:
data:
type: object
properties:
id:
type: string
format: uuid
name:
type: string
description:
type: string
nullable: true
color:
type: string
nullable: true
pillar_content_id:
type: string
format: uuid
nullable: true
site_id:
type: string
format: uuid
nullable: true
description: The site this cluster is scoped to, or null for an org-wide cluster.
seed_keywords:
type: array
items:
type: string
nullable: true
created_at:
type: string
format: date-time
updated_at:
type: string
format: date-time
content:
type: array
items:
type: object
properties:
id:
type: string
format: uuid
title:
type: string
status:
type: string
word_count:
type: integer
nullable: true
is_pillar:
type: boolean
updated_at:
type: string
format: date-time
briefs:
type: array
items:
type: object
properties:
id:
type: string
format: uuid
topic:
type: string
status:
type: string
updated_at:
type: string
format: date-time
request_id:
type: string
'400':
$ref: '#/components/responses/ValidationError'
'401':
$ref: '#/components/responses/Unauthorized'
'404':
$ref: '#/components/responses/NotFound'
'429':
description: Rate limited, or the org's monthly brief limit blocked minting the refreshed brief (only the FIRST supersession of a brief is billing-exempt; repeats meter normally)
/clusters/{id}/assign:
post:
operationId: assignToCluster
summary: Assign content or a brief to a cluster
description: Assign one or more content rows and/or briefs to a cluster. At least one of `content_id` or `brief_id` is required.
tags:
- Clusters
security:
- ApiKeyAuth: []
parameters:
- name: id
in: path
required: true
description: Cluster ID
schema:
type: string
format: uuid
requestBody:
required: true
content:
application/json:
schema:
type: object
properties:
content_id:
type: string
format: uuid
description: Content to assign. At least one of content_id or brief_id is required.
brief_id:
type: string
format: uuid
description: Brief to assign. At least one of content_id or brief_id is required.
responses:
'200':
description: Items assigned to the cluster
content:
application/json:
schema:
type: object
properties:
data:
type: object
properties:
cluster_id:
type: string
format: uuid
assigned:
type: array
items:
type: object
properties:
type:
type: string
enum:
- content
- brief
id:
type: string
format: uuid
request_id:
type: string
'400':
$ref: '#/components/responses/ValidationError'
'401':
$ref: '#/components/responses/Unauthorized'
'404':
$ref: '#/components/responses/NotFound'
'429':
description: Rate limited, or the org's monthly brief limit blocked minting the refreshed brief (only the FIRST supersession of a brief is billing-exempt; repeats meter normally)
/clusters/{id}/pillar:
post:
operationId: setClusterPillar
summary: Elect a cluster's pillar content
description: Promote a content row to be the cluster's pillar. The content must already be a member of the cluster (`not_a_member` otherwise) and must be an article, not a brief (`brief_not_allowed`). Electing a new pillar displaces the previous one, returned as `displaced_content_id`.
tags:
- Clusters
security:
- ApiKeyAuth: []
parameters:
- name: id
in: path
required: true
description: Cluster ID
schema:
type: string
format: uuid
requestBody:
required: true
content:
application/json:
schema:
type: object
required:
- content_id
properties:
content_id:
type: string
format: uuid
description: Required. The cluster member to elect as pillar.
responses:
'200':
description: Pillar elected
content:
application/json:
schema:
type: object
properties:
data:
type: object
properties:
cluster_id:
type: string
format: uuid
pillar_content_id:
type: string
format: uuid
pillar_title:
type: string
nullable: true
displaced_content_id:
type: string
format: uuid
nullable: true
description: The content that was pillar before this call, or null if there was none.
request_id:
type: string
'400':
description: The content is not a cluster member (not_a_member) or is a brief (brief_not_allowed)
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
'401':
$ref: '#/components/responses/Unauthorized'
'404':
$ref: '#/components/responses/NotFound'
'429':
description: Rate limited, or the org's monthly brief limit blocked minting the refreshed brief (only the FIRST supersession of a brief is billing-exempt; repeats meter normally)
components:
responses:
NotFound:
description: Resource not found
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
example:
error:
type: invalid_request_error
code: resource_not_found
message: The requested resource was not found.
doc_url: https://docs.frase.io/api/errors#resource_not_found
request_id: req_abc123
Unauthorized:
description: Authentication failed
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
example:
error:
type: authentication_error
code: invalid_api_key
message: Invalid API key. Check that you are using the correct key.
doc_url: https://docs.frase.io/api/errors#invalid_api_key
request_id: req_abc123
ValidationError:
description: Validation failed
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
example:
error:
type: invalid_request_error
code: validation_error
message: The request body is invalid.
param: prompt_text
doc_url: https://docs.frase.io/api/errors#validation_error
request_id: req_abc123
schemas:
Error:
type: object
properties:
error:
type: object
properties:
type:
type: string
code:
type: string
message:
type: string
param:
type: string
doc_url:
type: string
request_id:
type: string
Pagination:
type: object
properties:
page:
type: integer
page_size:
type: integer
total:
type: integer
has_more:
type: boolean
securitySchemes:
ApiKeyAuth:
type: apiKey
in: header
name: X-API-KEY
description: 'API key for authentication. Get your key from Settings > API Keys. You may also send the same key as `Authorization: Bearer <key>` — see BearerAuth.'
BearerAuth:
type: http
scheme: bearer
bearerFormat: Frase API key (sk_live_* / sk_test_*) or MCP access token (mcp_at_*)
description: 'Send either your API key or an MCP access token as `Authorization: Bearer <token>`. An API key sent this way is exactly equivalent to sending it in X-API-KEY — same identity, same scopes, same rate limits — so use whichever your HTTP client makes natural. X-API-KEY takes precedence if you somehow send both. Cookie/session auth is intentionally NOT supported on /api/v1/* endpoints.'