BuiltWith Tags API
The Tags API from BuiltWith — 1 operation(s) for tags.
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OpenAPI Specification
openapi: 3.2.0
info:
title: BuiltWith API (from llms.txt + samples) Tags API
version: '2026-05-08'
description: OpenAPI spec generated from https://api.builtwith.com/llms.txt and sample payloads under https://api.builtwith.com/samples/*.json (where available). Endpoints not covered by a sample file use a generic JSON schema.
servers:
- url: https://api.builtwith.com
security:
- ApiKeyQuery: []
tags:
- name: Tags
paths:
/tag1/api.json:
get:
operationId: tags_v1
tags:
- Tags
summary: Tags API
description: Domains related to IPs and site attributes. (Schema not provided by samples; generic JSON returned.)
parameters:
- $ref: '#/components/parameters/lookup'
responses:
'200':
description: OK
content:
application/json:
schema:
$ref: '#/components/schemas/AnyJson'
components:
schemas:
AnyJson:
description: A generic JSON payload.
oneOf:
- type: object
additionalProperties: true
- type: array
items: {}
- type: string
- type: number
- type: boolean
- type: 'null'
parameters:
lookup:
name: LOOKUP
in: query
required: true
schema:
type: string
description: Primary lookup value, typically a root domain (e.g. example.com).
securitySchemes:
ApiKeyQuery:
type: apiKey
in: query
name: KEY
description: BuiltWith API key (KEY).
BearerAuth:
type: http
scheme: bearer
description: BuiltWith API key or temporary bw- agent token in the Authorization header.
externalDocs:
description: 'Source: BuiltWith llms.txt'
url: https://api.builtwith.com/llms.txt
x-mcp:
endpoint: https://api.builtwith.com/mcp
server: builtwith
version: 1.3.0
transport: streamable-http
tools:
- domain-lookup
- domain-api
- domain-api-json
- change-api
- relationships-api
- free-api
- company-to-url
- tags-api
- recommendations-api
- redirects-api
- keywords-api
- keywords-search-api
- trends-api
- product-api
- trust-api
- financial-api
- social-api
- payment-balance
- payment-config
- payment-purchase
- vector-api
- ask-api
- ask-api-json
resources:
- ui://widget/domain-technologies.html
- ui://widget/ask-sites.html
prompts:
- analyze-tech-stack
- find-related-websites
- get-technology-recommendations
- research-company
- check-domain-trust
- discover-technologies-by-concept
x-live-feed-websocket:
tag: LiveFeed
servers:
- url: wss://sync.builtwith.com
connection_endpoints:
- wss://sync.builtwith.com/wss/new?KEY=YOUR_KEY
- wss://sync.builtwith.com/wss/channel/{TECH}?KEY=YOUR_KEY
commands:
- action: subscribe
payload:
action: subscribe
channel: Shopify
- action: unsubscribe
payload:
action: unsubscribe
channel: Shopify
- action: list_subscriptions
payload:
action: list_subscriptions