BuiltWith
BuiltWith is a website technology intelligence agent. It identifies the technology stack, relationships, trends, products, traffic, trust signals, financial and social profiles, keywords, and metadata for any website, and can list and rank the websites that use a given technology.
AgentCard object — a capabilities object, a declared protocolVersion, and a well-formed skills array.
An A2A client finds this agent by fetching the well-known path on the provider's own host. That is what makes an agent card different from every other agent artifact in this catalog: it is provider-published by construction — it cannot be derived, generated, or reconstructed on a provider's behalf.
https://api.builtwith.com/mcp
· transport HTTP+JSON
· protocol Domain technology profile domain-technology-profile
Look up the full technology stack detected on a website, including current and historical technologies, first/last detected dates, categories, and metadata.
technology-lookuptech-stackdomainmetadataTechnology change tracking technology-changes
Report technologies added, dropped, or changed on a website over time, and the redirects associated with a domain.
change-trackingaddeddroppedredirectsWebsite relationships website-relationships
Discover relationships between websites — shared analytics, advertising, hosting, and tracking identifiers that link domains to the same owner or network.
relationshipsownershipconnected-sitesTechnology lists and trends technology-lists-and-trends
List and rank the websites using a specific technology, with adoption trends over time, market share, and tag-based segmentation.
liststrendsmarket-shareadoptionCompany and firmographics company-and-firmographics
Resolve a company name to its primary website, and retrieve firmographic, financial, social, traffic, and trust signals for a domain.
companyfirmographicsfinancialsocialtrusttrafficKeywords and recommendations keywords-and-recommendations
Retrieve the keywords a website ranks for, search websites by keyword, and get technology recommendations for a domain.
keywordssearchrecommendationsNatural-language site discovery natural-language-site-discovery
Answer free-form questions that find and rank lists of websites by technology, concept, or attribute, returning structured results.
askdiscoverysemantic-searchvector2026-08-14 from https://api.builtwith.com/.well-known/agent-card.json,
HTTP 200. The body was saved verbatim and is the sole source for
everything on this page — no field is inferred.
View the captured card.
Providers change what they serve; if this card has moved or changed shape,
the provider profile carries the
current state as of the last build.
Work with this as data
Every agent card here is available over the APIs.io API and to AI agents over MCP. A2A Agent Cards is not yet its own endpoint on the v1 API. Reach it through catalog search and the tag graph, or the MCP server.