{"id":"b86af9fa-62d7-40ea-bcd4-62e8b1e24148","shortId":"PeuFbu","kind":"mpp","title":"Discover domain relationships and connected sites via BuiltWith's relationship data, paid per call on Tempo L2.","tagline":"Discover domain relationships and connected sites via BuiltWith's relationship data, paid per call on Tempo L2.","description":"The BuiltWith Relationships endpoint exposes BuiltWith's domain relationship discovery API through the Locus MPP (Micropayment Protocol). Given a domain, it returns related domains that share infrastructure, tracking codes, analytics IDs, or other technical fingerprints — useful for mapping corporate structures, affiliate networks, and shared ownership across websites.\n\nThis endpoint is part of a broader BuiltWith suite available via Locus MPP that includes domain tech profiling, technology lists, company-to-URL lookup, trends, trust signals, and more. The Relationships endpoint specifically accepts a domain lookup parameter with optional pagination (SKIP and AMOUNT, max 500 results per page). Each call costs 55,000 base units of pathUSD on Tempo L2, which equals $0.055 per request.\n\nPayment is settled via the Tempo method (pathUSD on Tempo L2). The endpoint uses a POST method with a JSON body. Note that the probe returned 404 on HEAD/GET — this is expected since the endpoint only accepts POST requests as documented in the OpenAPI spec. The OpenAPI schema is well-defined with clear parameter descriptions, though response schemas are not documented beyond status codes.","tags":["technology-profiling","tech-stack","competitive-intel","domains"],"capabilities":["domain-relationship-discovery","website-ownership-mapping","shared-infrastructure-detection","pagination-support","per-call-micropayment","tempo-l2-settlement"],"categories":["data","search"],"synonyms":["domain relationships","connected domains","related websites","site ownership lookup","BuiltWith relationships API","domain fingerprinting","shared tracking codes","affiliate network discovery"],"warnings":["Endpoint returned 404 on HEAD and GET probes; it only accepts POST per the OpenAPI spec — likely live but unconfirmed with a POST probe","Response schema is not documented — consumers cannot predict the shape of successful responses","Currency address 0x20c000000000000000000000b9537d11c60e8b50 assumed to be pathUSD (6 decimals) based on Tempo method context"],"endpointUrl":"https://builtwith.mpp.paywithlocus.com/builtwith/relationships","protocol":"mpp","transport":"http","auth":{"type":"mpp","details":{"realm":"builtwith.mpp.paywithlocus.com","intent":"charge","method":"tempo","service_methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}}}},"qualityScore":"0.550","qualityRationale":"OpenAPI spec is present with clear request schema and pricing, but the endpoint returned 404 on HEAD/GET (expected for POST-only). No response schema or example responses are documented. No crawled docs beyond the OpenAPI were 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'000':136 '404':175 '500':128 '55':135 'BuiltWith relationships API' 'accept':116,185 'across':80 'affili':75 'affiliate network discovery' 'amount':126 'analyt':64 'api':45 'avail':91 'base':137 'beyond':211 'bodi':169 'broader':88 'builtwith':8,25,36,40,89 'call':14,31,133 'clear':202 'code':63,213 'compani':103 'company-to-url':102 'connect':5,22 'connected domains' 'corpor':73 'cost':134 'data':11,28 'defin':200 'descript':204 'discov':1,18 'discoveri':44 'document':189,210 'domain':2,19,42,54,58,97,118 'domain fingerprinting' 'domain relationships' 'domain-relationship-discovery' 'endpoint':38,83,114,161,183 'equal':145 'expect':180 'expos':39 'fingerprint':69 'given':52 'head/get':177 'id':65 'includ':96 'infrastructur':61 'json':168 'l2':17,34,143,159 'list':101 'locus':48,93 'lookup':106,119 'map':72 'max':127 'method':155,165 'micropay':50 'mpp':49,94 'network':76 'note':170 'openapi':192,195 'option':122 'ownership':79 'page':131 'pagin':123 'pagination-support' 'paid':12,29 'paramet':120,203 'part':85 'pathusd':140,156 'payment':149 'per':13,30,130,147 'per-call-micropayment' 'post':164,186 'probe':173 'profil':99 'protocol':51 'relat':57 'related websites' 'relationship':3,10,20,27,37,43,113 'request':148,187 'respons':206 'result':129 'return':56,174 'schema':196,207 'settl':151 'share':60,78 'shared tracking codes' 'shared-infrastructure-detection' 'signal':109 'sinc':181 'site':6,23 'site ownership lookup' 'skip':124 'spec':193 'specif':115 'status':212 'structur':74 'suit':90 'tech':98 'technic':68 'technolog':100 'tempo':16,33,142,154,158 'tempo-l2-settlement' 'though':205 'track':62 'trend':107 'trust':108 'unit':138 'url':105 'use':70,162 'via':7,24,92,152 'websit':81 'website-ownership-mapping' 'well':199 'well-defin':198","prices":[{"id":"42278001-eeff-487f-a236-2b0cf506f2fc","listingId":"b86af9fa-62d7-40ea-bcd4-62e8b1e24148","amountUsd":"0.055","unit":"per_call","nativeCurrency":"pathUSD","nativeAmount":"55000","chain":"tempo","payTo":null,"paymentMethod":"mpp-tempo","isPrimary":true,"details":{"realm":"builtwith.mpp.paywithlocus.com","intent":"charge","method":"tempo","dynamic":false,"decimals":6,"unit_type":"request","amount_hint":null,"raw_payment":{"amount":"55000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"unitType":"request","description":"Relationships"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T20:00:50.462Z"}],"sources":[{"listingId":"b86af9fa-62d7-40ea-bcd4-62e8b1e24148","source":"mpp_dev","sourceId":"builtwith:POST:/builtwith/relationships","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T20:00:50.462Z","lastSeenAt":"2026-04-22T07:15:19.506Z"}],"details":{"listingId":"b86af9fa-62d7-40ea-bcd4-62e8b1e24148","quickStartSnippet":"curl -X POST https://builtwith.mpp.paywithlocus.com/builtwith/relationships \\\n  -H \"Content-Type: application/json\" \\\n  -H \"Authorization: <tempo-payment-token>\" \\\n  -d '{\"LOOKUP\": \"example.com\", \"AMOUNT\": \"50\"}'","exampleRequest":{"SKIP":"0","AMOUNT":"100","LOOKUP":"shopify.com"},"exampleResponse":null,"schema":{"path":"/builtwith/relationships","method":"POST","payment":{"amount":"55000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"unitType":"request","description":"Relationships"},"description":"Relationships"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The Relationships endpoint costs 55,000 base units via Tempo method","source_url":"https://builtwith.mpp.paywithlocus.com"},{"claim":"BuiltWith provides technology profiling across 100M+ websites","source_url":"https://builtwith.mpp.paywithlocus.com"},{"claim":"Additional documentation available at https://beta.paywithlocus.com/mpp/builtwith.md","source_url":"https://builtwith.mpp.paywithlocus.com"}],"useCases":["Mapping all domains owned by a single entity through shared analytics or tracking IDs","Discovering affiliate networks and partner sites connected to a target domain","Competitive intelligence — finding related properties of a competitor","Due diligence research to identify all web properties associated with a company","Fraud detection by linking suspicious domains through shared infrastructure"],"bestFor":["Agents needing programmatic domain relationship data without API key management","Pay-per-call access to BuiltWith relationship intelligence","Mapping corporate web property portfolios","Identifying hidden connections between domains"],"notFor":["Bulk relationship scanning at high volume (per-call pricing adds up)","Real-time monitoring of domain changes (point-in-time lookups only)","Users who need response schema guarantees (response format undocumented)"],"kindDetails":{"docs":{"llmsTxt":"https://paywithlocus.com/mpp/builtwith.md","homepage":"https://api.builtwith.com"},"tags":["technology-profiling","tech-stack","competitive-intel","domains"],"realm":"builtwith.mpp.paywithlocus.com","status":"active","methods":{"tempo":{"assets":["0x20c000000000000000000000b9537d11c60e8b50"],"intents":["charge"]}},"provider":{"url":"https://builtwith.com","name":"BuiltWith"},"categories":["data"],"service_id":"builtwith","integration":"third-party","service_name":"BuiltWith","service_description":"Technology profiling for websites — detect tech stacks, find sites using specific technologies, discover domain relationships, trends, and competitive intelligence across 100M+ websites."},"updatedAt":"2026-04-22T07:15:19.506Z"}}