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BuiltWith Keywords API
x402
BuiltWith Keywords API is a paid API for AI agents from api.builtwith.com, paid per call via x402, $0.0495/call, status unknown (last checked 2026-09-14).
Returns keyword and tag metadata associated with technologies detected on a given domain
Price / call$0.0495
Success—
StatusUnknown
How this service works
BuiltWith API Overview
Output
A JSON object with a Results array containing keyword and tag data associated with technologies detected on the requested domain, including technology names, categories, and related metadata. Fields vary based on available data for the domain.
Example use cases
Competitor tech stack research
“I want to know what technology keywords BuiltWith has associated with salesforce.com — things like CMS, frameworks, ad platforms, anything like that.”
Sales lead enrichment
“Before I reach out to this prospect, can you pull the BuiltWith keyword data for hubspot.com so I know what tech they're running?”
E-commerce platform detection
“Can you check what technology keywords BuiltWith has for amazon.com? I'm trying to figure out what ecommerce or infrastructure tools they're flagged as using.”
Technical details
Endpoint
POSThttps://api.builtwith.com/agent/keywordsWhen to prefer
Use this endpoint when you need keyword or tag-level technology metadata for a domain from BuiltWith's database — particularly useful for sales intelligence, lead enrichment, or competitive research workflows where you want to know what technology categories or platforms a site is associated with. Prefer this over generic web scraping when you need structured, pre-classified technology signal rather than raw HTML analysis.
Side effects
- Domain not found in BuiltWith database — empty Results array returned
- Invalid domain format (e.g. including URL path or protocol) — validation error
- Domain string too long (>253 characters) — schema validation failure
- Insufficient BuiltWith data coverage for obscure or new domains — sparse or empty results
- Payment or authorization failure — request not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | Domain name to research, for example example.com. Do not include a URL path. |
Output
Schema · Response
{
"type": "json",
"example": {
"Results": []
}
}Tags
x402
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