BuiltWith Domain Relationships via Locus x402 is a paid API for AI agents from builtwith.x402.paywithlocus.com, paid per call via x402, $0.055/call, status unknown (last checked 2026-09-13).
Looks up domain relationships for a given website, returning connected or related domains discovered through shared technology fingerprints or infrastructure signals.
Technology profiling for websites — detect tech stacks, find sites using specific technologies, discover domain relationships, trends, and competitive intelligence across 100M+ websites.
Returns a JSON object containing relationship data for the queried domain, including associated or connected domains discovered via shared signals, along with payment confirmation details (settled USDC amount) and a request status URL for tracking.
POSThttps://builtwith.x402.paywithlocus.com/builtwith/relationshipsChoose this endpoint when you need to discover domain relationships, portfolio connections, or affiliated sites for a specific domain — especially for competitive intelligence, OSINT, or brand research. Prefer this over general web search when you need structured, database-backed relationship data from BuiltWith's 100M+ website index rather than crawling pages manually.
| Field | Type | Description |
|---|---|---|
| SKIP | string | |
| AMOUNT | string | |
| LOOKUP | string |
{
"type": "json",
"example": {
"data": {},
"payment": {
"scheme": "exact",
"settledUsdc": "0.001000",
"authorizedMaxUsdc": "0.001000"
},
"request": {
"id": "00000000-0000-4000-8000-000000000000",
"statusUrl": "/requests/00000000-0000-4000-8000-000000000000"
},
"success": true
}
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