BuiltWith

aid: builtwith
name: BuiltWith
description: Technology profiling and lead generation platform with a REST API for detecting technologies used by websites,
  tracking technology trends, and identifying technology adoption across 491.9 million domains and 115,907 tracked web technologies.
type: Index
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/builtwith.png
url: https://raw.githubusercontent.com/api-evangelist/builtwith/refs/heads/main/apis.yml
created: 2026-06-13
modified: 2026-08-14
specificationVersion: '0.23'
tags:
- Technology Profiling
- Lead Generation
- Web Intelligence
- Technology Detection
- Website Analysis
- Market Research
- Technographics
- Sales Intelligence
- AI Agents
- MCP
- Agentic Commerce
- Real-Time Data
tags_raw:
- Technology Profiling
- Lead Generation
- Web Intelligence
- Technology Detection
- Website Analysis
- Market Research
- Technographics
- Sales Intelligence
- AI Agents
- Model Context Protocol
- Agentic Commerce
- Real-time Data
apis:
- name: BuiltWith Domain API
  description: Current and historical website technology information for single or multiple domains with support for JSON,
    XML, and CSV formats.
  humanURL: https://api.builtwith.com/domain-api
  baseURL: https://api.builtwith.com/v22
  tags:
  - Domain Lookup
  - Technology Detection
  - Historical Data
  properties:
  - type: Documentation
    url: https://api.builtwith.com/domain-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Lists API
  description: Retrieve lists of websites using specific web technologies in XML, JSON, TXT, CSV, and TSV formats.
  humanURL: https://api.builtwith.com/lists-api
  baseURL: https://api.builtwith.com/lists12
  tags:
  - Technology Lists
  - Lead Generation
  - Website Lists
  properties:
  - type: Documentation
    url: https://api.builtwith.com/lists-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Trends API
  description: Access technology trend data showing adoption and growth of web technologies over time.
  humanURL: https://api.builtwith.com/trends-api
  baseURL: https://api.builtwith.com/trends/v6
  tags:
  - Technology Trends
  - Market Intelligence
  - Adoption Data
  properties:
  - type: Documentation
    url: https://api.builtwith.com/trends-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Change API
  description: Track technology additions and removals on websites with business context in JSON format.
  humanURL: https://api.builtwith.com/change-api
  baseURL: https://api.builtwith.com/change1
  tags:
  - Technology Changes
  - Business Intelligence
  - Signals
  properties:
  - type: Documentation
    url: https://api.builtwith.com/change-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Relationships API
  description: Website interconnection data revealing domain relationships via shared IPs, analytics, and other attributes.
  humanURL: https://api.builtwith.com/relationships-api
  baseURL: https://api.builtwith.com/rv4
  tags:
  - Domain Relationships
  - Web Graph
  - Interconnections
  properties:
  - type: Documentation
    url: https://api.builtwith.com/relationships-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Free API
  description: Free tier API providing technology group counts and last-updated timestamps for website domains.
  humanURL: https://api.builtwith.com/free-api
  baseURL: https://api.builtwith.com/free1
  tags:
  - Free Tier
  - Technology Counts
  - Domain Lookup
  properties:
  - type: Documentation
    url: https://api.builtwith.com/free-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Ask API
  description: Natural language website lookups returning technology profile data in JSON and CSV formats.
  humanURL: https://api.builtwith.com/ask-api
  baseURL: https://api.builtwith.com/ask1
  tags:
  - Natural-Language
  - Artificial Intelligence
  - Domain Lookup
  tags_raw:
  - Natural Language
  - AI
  - Domain Lookup
  properties:
  - type: Documentation
    url: https://api.builtwith.com/ask-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Live Feed API
  description: Real-time WebSocket feed of technology detections as they happen across the web.
  humanURL: https://api.builtwith.com/live-feed-api
  baseURL: wss://sync.builtwith.com/wss/
  tags:
  - Real-Time
  - WebSocket
  - Streaming
  tags_raw:
  - Real-time
  - WebSocket
  - Streaming
  properties:
  - type: Documentation
    url: https://api.builtwith.com/live-feed-api
  - type: AsyncAPI
    url: asyncapi/builtwith-live-feed-asyncapi.yml
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Company to URL API
  description: Resolve company names to their associated domain names in JSON and XML formats.
  humanURL: https://api.builtwith.com/company-to-url
  baseURL: https://api.builtwith.com/ctu3
  tags:
  - Company Lookup
  - Domain Resolution
  - Lead Generation
  properties:
  - type: Documentation
    url: https://api.builtwith.com/company-to-url
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Tags API
  description: Retrieve related domains associated with IPs and other website attributes.
  humanURL: https://api.builtwith.com/tags-api
  baseURL: https://api.builtwith.com/tag1
  tags:
  - IP Lookup
  - Domain Tags
  - Attribution
  properties:
  - type: Documentation
    url: https://api.builtwith.com/tags-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Recommendations API
  description: Get technology suggestions based on a website's existing technology profile.
  humanURL: https://api.builtwith.com/recommendations-api
  baseURL: https://api.builtwith.com/rec1
  tags:
  - Recommendations
  - Technology Suggestions
  - Intelligence
  properties:
  - type: Documentation
    url: https://api.builtwith.com/recommendations-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Keywords API
  description: Find websites that use specific keywords in their content.
  humanURL: https://api.builtwith.com/keywords-api
  baseURL: https://api.builtwith.com/kw2
  tags:
  - Keyword Search
  - Content Intelligence
  - Lead Generation
  properties:
  - type: Documentation
    url: https://api.builtwith.com/keywords-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Keyword Search API
  description: Search websites by keyword content returning results in JSON and CSV formats.
  humanURL: https://api.builtwith.com/keyword-search-api
  baseURL: https://api.builtwith.com/kws1
  tags:
  - Keyword Search
  - Content Discovery
  - Lead Generation
  properties:
  - type: Documentation
    url: https://api.builtwith.com/keyword-search-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Vector Search API
  description: Text-based technology searches using vector embeddings for semantic similarity matching.
  humanURL: https://api.builtwith.com/vector-search-api
  baseURL: https://api.builtwith.com/vector/v1
  tags:
  - Vector Search
  - Artificial Intelligence
  - Semantic Search
  tags_raw:
  - Vector Search
  - AI
  - Semantic Search
  properties:
  - type: Documentation
    url: https://api.builtwith.com/vector-search-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Redirects API
  description: Access website redirect chain data to understand domain redirect patterns.
  humanURL: https://api.builtwith.com/redirects-api
  baseURL: https://api.builtwith.com/redirect1
  tags:
  - Redirects
  - Domain Intelligence
  - Website Data
  properties:
  - type: Documentation
    url: https://api.builtwith.com/redirects-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Product API
  description: eCommerce product lookup for identifying products and merchants across the web.
  humanURL: https://api.builtwith.com/product-api
  baseURL: https://api.builtwith.com/productv1
  tags:
  - E-Commerce
  - Product Intelligence
  - Retail
  tags_raw:
  - eCommerce
  - Product Intelligence
  - Retail
  properties:
  - type: Documentation
    url: https://api.builtwith.com/product-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Trust API
  description: Website trustworthiness assessment providing reliability and safety scores for domains.
  humanURL: https://api.builtwith.com/trust-api
  baseURL: https://api.builtwith.com/trustv1
  tags:
  - Trust Score
  - Safety
  - Domain Intelligence
  properties:
  - type: Documentation
    url: https://api.builtwith.com/trust-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Financial API
  description: Access financial data from SEC Edgar and UK Companies House filings for domains, including revenue, assets,
    and equity data.
  humanURL: https://api.builtwith.com/financial-api
  baseURL: https://api.builtwith.com/financial1
  tags:
  - Financial Data
  - SEC Filings
  - Companies House
  - Business Intelligence
  properties:
  - type: Documentation
    url: https://api.builtwith.com/financial-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Bulk Domain API
  description: Batch domain processing for high-volume technology lookups across large domain lists.
  humanURL: https://api.builtwith.com/bulk-domain-api
  baseURL: https://api.builtwith.com/v22/domain
  tags:
  - Bulk Processing
  - Batch API
  - High Volume
  properties:
  - type: Documentation
    url: https://api.builtwith.com/bulk-domain-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith MCP API
  description: Model Context Protocol server integration enabling AI assistants to query BuiltWith technology detection data
    natively.
  humanURL: https://api.builtwith.com/mcp-api
  baseURL: https://api.builtwith.com/mcp
  tags:
  - MCP
  - AI Integration
  tags_raw:
  - MCP
  - AI Integration
  - Model Context Protocol
  properties:
  - type: Documentation
    url: https://api.builtwith.com/mcp-api
  - type: GitHubRepository
    url: https://github.com/builtwith/builtwith-mcp
  - type: MCPServer
    url: mcp/builtwith-mcp.yml
  - type: ToolCrosswalk
    url: mcp/builtwith-tool-crosswalk.yml
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith Agent Payment API
  description: Autonomous credit management API enabling AI agents to manage and replenish API credits programmatically. Charges
    an existing account's saved Stripe payment method against a separately scoped Agent Billing Key, with a required Idempotency-Key
    on every purchase.
  humanURL: https://api.builtwith.com/agent-payment-api
  baseURL: https://payments.builtwith.com
  tags:
  - AI Agents
  - Payments
  - Credits
  - Autonomous
  properties:
  - type: Documentation
    url: https://api.builtwith.com/agent-payment-api
  - type: OpenAPI
    url: openapi/builtwith-agent-stripe-topup-openapi.json
  - type: Idempotency
    url: conventions/builtwith-conventions.yml
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith REST API
  description: The provider-published OpenAPI 3.0.3 document covering the whole BuiltWith REST surface - WhoAmI, Usage, Domain,
    Change, Lists, Relationships, Free, Company to URL, Tags, Recommendations, Redirects, Keywords, Keyword Search, Trends,
    Product, Trust, Financial, Social, Vector Search, Ask, agent device-code authorization and agent billing - served by BuiltWith
    at /.well-known/openai.json.
  humanURL: https://api.builtwith.com/
  baseURL: https://api.builtwith.com
  tags:
  - REST
  - Technology Detection
  - Web Intelligence
  properties:
  - type: OpenAPI
    url: openapi/builtwith-rest-api-openapi.json
  - type: Documentation
    url: https://api.builtwith.com/
  - type: APIReference
    url: https://api.builtwith.com/domain-api
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- name: BuiltWith x402 Pay-per-Call API
  description: Accountless pay-per-call access to BuiltWith intelligence over the x402 v2 payment protocol on Base mainnet.
    Twelve fixed-price /agent/* routes answer 402 with a PAYMENT-REQUIRED challenge, settle in USDC on retry with PAYMENT-SIGNATURE,
    and require no API key, account or prepaid balance.
  humanURL: https://api.builtwith.com/x402-api
  baseURL: https://api.builtwith.com
  tags:
  - x402
  - Agentic Commerce
  - pay-per-call
  - AI Agents
  tags_raw:
  - x402
  - Agentic Commerce
  - Pay Per Call
  - AI Agents
  properties:
  - type: OpenAPI
    url: openapi/builtwith-x402-pay-per-call-openapi.json
  - type: Documentation
    url: https://api.builtwith.com/x402-api
  - type: AgentSkill
    url: skills/builtwith-pay-per-call-with-x402.md
  contact:
  - FN: BuiltWith Support
    url: https://builtwith.com/contact
- aid: builtwith:builtwith-bulk-processing-api
  name: BuiltWith Bulk Processing API
  description: Asynchronous batch domain processing
  humanURL: https://api.builtwith.com/domain-api
  baseURL: https://api.builtwith.com/v22
  tags:
  - Bulk Processing
  properties:
  - type: OpenAPI
    url: openapi/builtwith-bulk-processing-api-openapi.yml
- aid: builtwith:builtwith-domain-lookup-api
  name: BuiltWith Domain Lookup API
  description: Single or multi-domain technology detection endpoints
  humanURL: https://api.builtwith.com/domain-api
  baseURL: https://api.builtwith.com/v22
  tags:
  - Domain Lookup
  properties:
  - type: OpenAPI
    url: openapi/builtwith-domain-lookup-api-openapi.yml
- aid: builtwith:builtwith-domain-relationships-api
  name: BuiltWith Domain Relationships API
  description: Identify domain interconnections via shared identifiers
  humanURL: https://api.builtwith.com/domain-api
  baseURL: https://api.builtwith.com/v22
  tags:
  - Domain Relationships
  properties:
  - type: OpenAPI
    url: openapi/builtwith-domain-relationships-api-openapi.yml
- aid: builtwith:builtwith-free-lookup-api
  name: BuiltWith Free Lookup API
  description: Technology count lookups for free tier
  humanURL: https://api.builtwith.com/domain-api
  baseURL: https://api.builtwith.com/v22
  tags:
  - Free Lookup
  properties:
  - type: OpenAPI
    url: openapi/builtwith-free-lookup-api-openapi.yml
- aid: builtwith:builtwith-tag-lookup-api
  name: BuiltWith Tag Lookup API
  description: Lookup domains by IP or attribute identifier
  humanURL: https://api.builtwith.com/domain-api
  baseURL: https://api.builtwith.com/v22
  tags:
  - Tag Lookup
  properties:
  - type: OpenAPI
    url: openapi/builtwith-tag-lookup-api-openapi.yml
- aid: builtwith:builtwith-technology-changes-api
  name: BuiltWith Technology Changes API
  description: Track technology additions and removals on websites
  humanURL: https://api.builtwith.com/domain-api
  baseURL: https://api.builtwith.com/v22
  tags:
  - Technology Changes
  properties:
  - type: OpenAPI
    url: openapi/builtwith-technology-changes-api-openapi.yml
- aid: builtwith:builtwith-technology-lists-api
  name: BuiltWith Technology Lists API
  description: Retrieve websites using specific technologies
  humanURL: https://api.builtwith.com/domain-api
  baseURL: https://api.builtwith.com/v22
  tags:
  - Technology Lists
  properties:
  - type: OpenAPI
    url: openapi/builtwith-technology-lists-api-openapi.yml
- aid: builtwith:builtwith-technology-trends-api
  name: BuiltWith Technology Trends API
  description: Technology adoption trends and market share data
  humanURL: https://api.builtwith.com/domain-api
  baseURL: https://api.builtwith.com/v22
  tags:
  - Technology Trends
  properties:
  - type: OpenAPI
    url: openapi/builtwith-technology-trends-api-openapi.yml
common:
- type: IssueTracker
  url: https://github.com/builtwith/builtwith-mcp/issues
- type: Releases
  url: https://github.com/builtwith/builtwith-mcp/releases
- type: License
  name: MIT
  url: https://github.com/builtwith/builtwith-mcp/blob/main/LICENSE
- type: AgenticAccess
  url: agentic-access/builtwith-agentic-access.yml
- type: VulnerabilityDisclosure
  url: security/builtwith-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/builtwith-domain-security.yml
- type: Authentication
  url: authentication/builtwith-authentication.yml
- type: Website
  url: https://builtwith.com/
- type: Documentation
  url: https://api.builtwith.com/
- type: LinkedIn
  url: https://www.linkedin.com/company/builtwith
- type: Blog
  url: https://blog.builtwith.com/
- type: Pricing
  url: https://builtwith.com/plans
- type: X
  url: https://x.com/builtwith
- type: KnowledgeBase
  url: https://kb.builtwith.com/
- type: PostmanWorkspace
  url: https://www.postman.com/builtwithcom/builtwith/overview
- type: Plans
  url: plans/builtwith-plans-pricing.yml
- type: RateLimits
  url: rate-limits/builtwith-rate-limits.yml
- type: FinOps
  url: finops/builtwith-finops.yml
- type: AgentCard
  name: BuiltWith A2A Agent Card (conformant, A2A 0.3.0)
  url: a2a/builtwith-a2a.yml
- type: MCPServer
  name: BuiltWith hosted MCP server (48 tools, streamable HTTP)
  url: mcp/builtwith-mcp.yml
- type: ToolCrosswalk
  url: mcp/builtwith-tool-crosswalk.yml
- type: LLMsTxt
  url: llms/builtwith-llms.txt
- type: WellKnown
  url: well-known/builtwith-well-known.yml
- type: APICatalog
  name: RFC 9727 api-catalog linkset
  url: well-known/builtwith-api-catalog.json
- type: SecurityTxt
  url: well-known/builtwith-security.txt
- type: Security
  name: RFC 9116 security contact and PGP key
  url: https://builtwith.com/.well-known/security.txt
- type: OAuthScopes
  url: scopes/builtwith-scopes.yml
- type: Packages
  url: packages/builtwith-packages.yml
- type: SDKs
  name: First-party client libraries and CLI
  url: packages/builtwith-packages.yml
- type: CLI
  url: cli/builtwith-cli.yml
- type: Conventions
  url: conventions/builtwith-conventions.yml
- type: Idempotency
  name: Idempotency-Key on account credit purchases
  url: conventions/builtwith-conventions.yml
- type: ErrorCatalog
  name: BuiltWith API error-code registry
  url: errors/builtwith-error-codes.yml
- type: ErrorCodes
  url: errors/builtwith-problem-types.yml
- type: Lifecycle
  url: lifecycle/builtwith-lifecycle.yml
- type: Conformance
  url: conformance/builtwith-conformance.yml
- type: DataModel
  url: data-model/builtwith-data-model.yml
- type: Components
  url: components/builtwith-components.yml
- type: AgentSkill
  name: BuiltWith agent skills
  url: skills/_index.yml
- type: AsyncAPI
  name: BuiltWith Live Feed API events
  url: asyncapi/builtwith-live-feed-asyncapi.yml
- type: Vocabulary
  url: vocabulary/builtwith-vocabulary.yml
- type: JSONSchema
  name: Domain lookup schema
  url: json-schema/builtwith-domain-schema.json
- type: JSONSchema
  name: Technology change schema
  url: json-schema/builtwith-change-schema.json
- type: JSONSchema
  name: Technology lists schema
  url: json-schema/builtwith-lists-schema.json
- type: JSONLDContext
  url: json-ld/builtwith-context.jsonld
- type: SpectralRules
  url: rules/builtwith-jsonschema-spectral-rules.yml
- type: Examples
  name: Domain lookup example
  url: examples/builtwith-domain-example.json
- type: Examples
  name: Technology lists example
  url: examples/builtwith-lists-example.json
- type: Examples
  name: Technology trends example
  url: examples/builtwith-trends-example.json
- type: Examples
  name: Technology change example
  url: examples/builtwith-change-example.json
- type: Overlay
  name: API Evangelist overlay for the published REST OpenAPI
  url: overlays/builtwith-rest-api-overlay.yaml
- type: Overlay
  name: API Evangelist overlay for the x402 pay-per-call OpenAPI
  url: overlays/builtwith-x402-pay-per-call-overlay.yaml
- type: DeveloperPortal
  url: https://api.builtwith.com/
- type: APIReference
  url: https://api.builtwith.com/domain-api
- type: Support
  url: https://builtwith.com/contact
- type: SupportFAQs
  url: https://builtwith.com/faq
- type: TermsOfService
  url: https://builtwith.com/terms
- type: PrivacyPolicy
  url: https://builtwith.com/privacy
- type: SignUp
  url: https://builtwith.com/signup
- type: Login
  url: https://builtwith.com/login
- type: GitHubOrganization
  url: https://github.com/builtwith
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
x-enrichment:
  date: '2026-08-14'
  status: enriched
  artifacts_added: 45
  pass: local-v1