{"uid":"cap_esjVZqPnymGnnrziT352I","slug":"builtwith-domain-relationships-via-locus-x402-236ba619","name":"BuiltWith Domain Relationships via Locus x402","description":"Technology profiling for websites — detect tech stacks, find sites using specific technologies, discover domain relationships, trends, and competitive intelligence across 100M+ websites.","url":"https://builtwith.x402.paywithlocus.com/builtwith/relationships","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"SKIP":{"type":"string"},"AMOUNT":{"type":"string"},"LOOKUP":{"type":"string"}}},"responseSchema":{"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}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.055","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.055/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.055","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.055","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_1_NuvwJj4-3fRcHWSqSqU","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.055","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Looks up domain relationships for a given website, returning connected or related domains discovered through shared technology fingerprints or infrastructure signals.","exampleAgentPrompt":"Can you find all the domains related to shopify.com using BuiltWith? Show me the first 50 results.","exampleUseCases":[{"title":"Competitive domain portfolio mapping","prompt":"Find all the domains connected to or related to salesforce.com — I want to understand their full web property portfolio. Give me the first 100 results."},{"title":"OSINT investigation on a brand","prompt":"I'm researching a company at acmecorp.com — can you pull up all related domains BuiltWith has on file for them? Start from the beginning and return up to 200 results."},{"title":"Affiliate and subsidiary site discovery","prompt":"What domains are related to nike.com according to BuiltWith? I want to see if they have any regional or subsidiary sites I'm not aware of — get me the first 50."}],"resultDescription":"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.","failureModes":["Invalid or malformed domain in LOOKUP field returns empty or error data","AMOUNT exceeding 500 results per page may be rejected or capped","Missing LOOKUP parameter causes request failure","Payment failure via x402 protocol results in no data returned","Obscure or newly registered domains may return no relationship data"],"whenToPreferThis":"Choose 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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T18:31:57.744Z","isFirstParty":false}