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BuiltWith Tags Lookup API
x402
BuiltWith Tags Lookup 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).
Looks up websites or IPs associated with a specific BuiltWith tag or technology attribute
Price / call$0.0495
Success—
StatusUnknown
How this service works
BuiltWith API Overview
Output
A JSON object with a 'Results' array containing websites and associated metadata linked to the queried BuiltWith tag or attribute. The number and detail of results vary based on the tag and available data in the BuiltWith database.
Example use cases
Technology adoption competitive research
“I want to find all the websites tagged with the BuiltWith attribute 'Shopify' so I can see who my e-commerce competitors are using that platform.”
IP address website association lookup
“Can you look up the BuiltWith tag 'IP-75.126.76.154' and tell me which websites are associated with that IP address?”
Lead generation by technology tag
“Search BuiltWith for all sites tagged with 'Marketo' so I can build a list of potential leads that use marketing automation.”
Technical details
Endpoint
POSThttps://api.builtwith.com/agent/tagsWhen to prefer
Use this endpoint when you need to discover which websites are associated with a specific BuiltWith technology tag or IP attribute. Prefer this over general web scraping when you need structured, pre-indexed technology adoption data from BuiltWith's database. Best suited for competitive intelligence, lead generation by technology stack, or mapping IP addresses to hosted websites.
Side effects
- Empty Results array if no websites are associated with the given tag
- Invalid or unrecognized tag format returns empty or error response
- Tag string exceeds 300 characters or is empty — validation error
- Payment failure via x402 protocol prevents API access
- Rate limiting or authentication issues returning HTTP error codes
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| lookup | string | BuiltWith tag or attribute, for example IP-75.126.76.154. |
Output
Schema · Response
{
"type": "json",
"example": {
"Results": []
}
}Tags
x402
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