BuiltWith

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.

BuiltWith publishes 8 APIs on the APIs.io network, including Bulk Processing API, Domain Lookup API, Domain Relationships API, and 5 more. Tagged areas include Technology Profiling, Lead Generation, Web Intelligence, Technology Detection, and Website Analysis.

The BuiltWith catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

BuiltWith’s developer surface includes authentication, documentation, engineering blog, pricing, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

47.3/100 developing ▬ flat Agent 37/100 agent ready Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessFreemiumSelf serve⚡ Free to try

29 APIs

Technology ProfilingLead GenerationWeb IntelligenceTechnology DetectionWebsite AnalysisMarket Research

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 47.3/100 · developing

Contract Quality 17.0 / 25

Developer Ergonomics 5.2 / 20

Commercial Clarity 10.0 / 20

Operational Transparency 0.7 / 13

Governance 7.0 / 12

Discoverability 7.4 / 10

Agent readiness — 37/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/builtwith: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 29

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Builtwith Rate Limits

0 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

JSON Schema 3

Standalone JSON Schema definitions for this provider's data models.

Examples 4

Example request and response payloads for these APIs.

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrg

GitHubOrg

PostmanWorkspace

PostmanWorkspace

Access & Security 3

Authentication, authorization, and security posture

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

Website

Website

LinkedIn

Blog

Blog

Other 2

Properties that don't map to a standard resource type

KnowledgeBase

KnowledgeBase

Source (apis.yml)

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: 2026-06-13
specificationVersion: '0.19'
tags:
- Technology Profiling
- Lead Generation
- Web Intelligence
- Technology Detection
- Website Analysis
- Market Research
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
  - 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
  properties:
  - type: Documentation
    url: https://api.builtwith.com/live-feed-api
  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
  - 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:
  - 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
  tags:
  - MCP
  - AI Integration
  - Model Context Protocol
  properties:
  - type: Documentation
    url: https://api.builtwith.com/mcp-api
  - type: GitHubRepository
    url: https://github.com/builtwith/mcp
  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.
  humanURL: https://api.builtwith.com/agent-payment-api
  baseURL: https://api.builtwith.com
  tags:
  - AI Agents
  - Payments
  - Credits
  - Autonomous
  properties:
  - type: Documentation
    url: https://api.builtwith.com/agent-payment-api
  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: 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: GitHubOrg
  url: https://github.com/builtwith
- 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
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com