{"uid":"cap_ZCxINylhgMAQwgf3BU7lY","slug":"builtwith-relationships-api-d800be30","name":"BuiltWith Relationships API","description":"BuiltWith API Overview","url":"https://api.builtwith.com/agent/relationships","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"domain":{"type":"string","maxLength":253,"minLength":1,"description":"Domain name to research, for example example.com. Do not include a URL path."}}},"responseSchema":{"type":"json","example":{"Results":[]}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.0495","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":"$0.0495/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0495","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.0495","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_T77xD1nGSBDkb7GOTx9bK","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.0495","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns relationship and network data for a given domain, revealing connected domains and technology ownership patterns","exampleAgentPrompt":"Can you use BuiltWith to pull the domain relationships for shopify.com — I want to see what other domains or properties are connected to it?","exampleUseCases":[{"title":"Competitive domain footprint mapping","prompt":"I'm doing competitive research on stripe.com — can you find all the related or connected domains associated with it using BuiltWith's relationships data?"},{"title":"M&A digital due diligence","prompt":"We're evaluating an acquisition target — can you pull the BuiltWith relationship graph for acmecorp.com to see what other domains they own or are linked to?"},{"title":"Brand protection and impersonation check","prompt":"I need to know if there are other domains out there connected to nike.com — can you run a relationships lookup on it to spot any affiliated or potentially impersonating properties?"}],"resultDescription":"A JSON object with a Results array containing relationship and network data associated with the queried domain, including connected domains and ownership linkage signals as available in the BuiltWith dataset.","failureModes":["Empty Results array if no relationship data exists for the domain","Invalid domain format returns a validation error","Obscure or brand-new domains may return sparse or no data","Network timeouts on large relationship graphs","Malformed domain input (e.g., including URL path) causes errors"],"whenToPreferThis":"Choose this endpoint when you need to discover the network of domains related to a given site — such as finding sister properties, uncovering hidden corporate digital footprints, or doing competitive/M&A due diligence. Prefer this over a general technology lookup when the goal is mapping domain-to-domain relationships rather than just identifying technologies on a single site.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:32:03.576Z","isFirstParty":false}