# BuiltWith

**Canonical:** https://apis.io/providers/builtwith/  
**Website:** https://builtwith.com/  
**APIs profiled:** 31

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.

## Kin Score — 59.6 / 100 (strong)

Scored 2026-08-20 under rubric 0.12.0. Trend: flat (+0.0 from 59.6).

| Facet | Score |
|---|---|
| Discoverability | 81.5 |
| Contract Quality | 69.2 |
| Governance | 55.3 |
| Contract Governance | 55.3 |
| Operational Transparency | 28.9 |
| Developer Ergonomics | 66.1 |
| Commercial Clarity | 52.6 |
| Access Clarity | 52.6 |

## Agent readiness — 59.0 (agent-native)

| Dimension | Value |
|---|---|
| Spec Presence | yes |
| Agentic Access | derived |
| Reversibility Documented | no |
| MCP Server | documented |
| Auth Clarity | yes |
| Idempotency | verified |
| Error Semantics | documented |
| OpenAPI Examples | partial |
| Rate Limit Signal | documented |
| Event Surface Described | derived |
| Agent Skills | derived |
| Well Known Catalog | no |
| Consent Identity | yes |
| Agent Card | conformant |
| Dry Run Mode | no |

## Access

Freemium · Self-serve signup — onboarding: self-serve, pricing: freemium, trial: no (confidence: high).

## APIs (31)

- **BuiltWith Domain API** — Current and historical website technology information for single or multiple domains with support for JSON, XML, and CSV formats.
- **BuiltWith Lists API** — Retrieve lists of websites using specific web technologies in XML, JSON, TXT, CSV, and TSV formats.
- **BuiltWith Trends API** — Access technology trend data showing adoption and growth of web technologies over time.
- **BuiltWith Change API** — Track technology additions and removals on websites with business context in JSON format.
- **BuiltWith Relationships API** — Website interconnection data revealing domain relationships via shared IPs, analytics, and other attributes.
- **BuiltWith Free API** — Free tier API providing technology group counts and last-updated timestamps for website domains.
- **BuiltWith Ask API** — Natural language website lookups returning technology profile data in JSON and CSV formats.
- **BuiltWith Live Feed API** — Real-time WebSocket feed of technology detections as they happen across the web.
- **BuiltWith Company to URL API** — Resolve company names to their associated domain names in JSON and XML formats.
- **BuiltWith Tags API** — Retrieve related domains associated with IPs and other website attributes.
- **BuiltWith Recommendations API** — Get technology suggestions based on a website's existing technology profile.
- **BuiltWith Keywords API** — Find websites that use specific keywords in their content.
- **BuiltWith Keyword Search API** — Search websites by keyword content returning results in JSON and CSV formats.
- **BuiltWith Vector Search API** — Text-based technology searches using vector embeddings for semantic similarity matching.
- **BuiltWith Redirects API** — Access website redirect chain data to understand domain redirect patterns.
- **BuiltWith Product API** — eCommerce product lookup for identifying products and merchants across the web.
- **BuiltWith Trust API** — Website trustworthiness assessment providing reliability and safety scores for domains.
- **BuiltWith Financial API** — Access financial data from SEC Edgar and UK Companies House filings for domains, including revenue, assets, and equity data.
- **BuiltWith Bulk Domain API** — Batch domain processing for high-volume technology lookups across large domain lists.
- **BuiltWith MCP API** — Model Context Protocol server integration enabling AI assistants to query BuiltWith technology detection data natively.
- **BuiltWith Agent Payment API** — 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 sep...
- **BuiltWith REST API** — 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, Recomm...
- **BuiltWith x402 Pay-per-Call API** — 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-REQUIRE...
- **BuiltWith Bulk Processing API** — Asynchronous batch domain processing
- **BuiltWith Domain Lookup API** — Single or multi-domain technology detection endpoints
- **BuiltWith Domain Relationships API** — Identify domain interconnections via shared identifiers
- **BuiltWith Free Lookup API** — Technology count lookups for free tier
- **BuiltWith Tag Lookup API** — Lookup domains by IP or attribute identifier
- **BuiltWith Technology Changes API** — Track technology additions and removals on websites
- **BuiltWith Technology Lists API** — Retrieve websites using specific technologies
- **BuiltWith Technology Trends API** — Technology adoption trends and market share data

## MCP servers (1)

- **BuiltWith MCP Server**

## Agentic access (1)

- **Builtwith Agentic Access** — 20 operations · 1 acting

## Security (3)

- **Builtwith Authentication** — apiKey/http/oauth2 · 5 schemes
- **Builtwith Domain Security** — TLSv1.2 · HSTS · DNSSEC · DMARC
- **Builtwith Vulnerability Disclosure** — Hackerone · security.txt · contact published

## Plans (1)

- **Builtwith Plans Pricing**

## Tags

Technology Profiling, Lead Generation, Web Intelligence, Technology Detection, Website Analysis, Market Research, Technographics, Sales Intelligence, AI Agents, MCP, Agentic Commerce, Real-Time Data

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/builtwith/). Scores are computed from the provider's own public artifacts under a published rubric.