{"uid":"cap_vl1fM6911cvWVKqr04A-k","slug":"builtwith-tags-lookup-via-locus-x402-598f89e9","name":"BuiltWith Tags Lookup 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/tags","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"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_oFiVpLJxdnKzaCvbddPTz","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":"Look up which websites use a specific technology tag or attribute, returning adoption data across 100M+ websites via the BuiltWith API.","exampleAgentPrompt":"Using BuiltWith, find all websites that use the 'Shopify' technology tag so I can build a list of ecommerce competitors running that platform.","exampleUseCases":[{"title":"Competitor tech stack discovery","prompt":"Can you look up which major websites are using the Klaviyo email marketing tag? I want to find ecommerce brands to target for our competing email tool."},{"title":"IP-based site attribution","prompt":"Find all websites associated with the IP prefix IP-104.21.0.0 using BuiltWith — I need to know what domains are hosted on that network."},{"title":"Sales prospecting by technology","prompt":"Pull a list of websites that have the HubSpot CRM tag installed — I'm building a prospect list for our sales team to reach out to HubSpot customers."}],"resultDescription":"Returns a JSON data object containing the list of websites or domains associated with the queried technology tag or IP attribute, including adoption counts and related metadata, along with payment settlement details confirming the USDC microtransaction.","failureModes":["Invalid or unrecognized LOOKUP value returns empty data object","Missing LOOKUP field causes request error","IP address not prefixed with 'IP-' may not return IP-based results","Payment failure or insufficient USDC balance blocks the request","Rate limiting or quota exceeded on the BuiltWith API side","Rare tags with no known adopters return empty results"],"whenToPreferThis":"Choose this endpoint when you need to discover which websites use a specific technology, plugin, tag, or attribute at scale across 100M+ websites. It is ideal for sales prospecting, competitive intelligence, and technology adoption research. Prefer this over manual web scraping or smaller tech-detection tools when breadth of coverage and structured attribute-based lookup are required. The x402 micropayment model makes it accessible per-call without subscription overhead.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:35:14.280Z","isFirstParty":false}