{"uid":"cap_WPDYAspzlXfdBmLYBtk6N","slug":"builtwith-tags-lookup-api-30d818d6","name":"BuiltWith Tags Lookup API","description":"BuiltWith API Overview","url":"https://api.builtwith.com/agent/tags","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"lookup":{"type":"string","maxLength":300,"minLength":1,"description":"BuiltWith tag or attribute, for example IP-75.126.76.154."}}},"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_L4rlFUBUcXUQH9w7cQ10i","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":"Looks up websites or IPs associated with a specific BuiltWith tag or technology attribute","exampleAgentPrompt":"Use BuiltWith to look up which websites are associated with the tag 'IP-75.126.76.154' and show me the results.","exampleUseCases":[{"title":"Technology adoption competitive research","prompt":"I want to find all the websites tagged with the BuiltWith attribute 'Shopify' so I can see who my e-commerce competitors are using that platform."},{"title":"IP address website association lookup","prompt":"Can you look up the BuiltWith tag 'IP-75.126.76.154' and tell me which websites are associated with that IP address?"},{"title":"Lead generation by technology tag","prompt":"Search BuiltWith for all sites tagged with 'Marketo' so I can build a list of potential leads that use marketing automation."}],"resultDescription":"A JSON object with a 'Results' array containing websites and associated metadata linked to the queried BuiltWith tag or attribute. The number and detail of results vary based on the tag and available data in the BuiltWith database.","failureModes":["Empty Results array if no websites are associated with the given tag","Invalid or unrecognized tag format returns empty or error response","Tag string exceeds 300 characters or is empty — validation error","Payment failure via x402 protocol prevents API access","Rate limiting or authentication issues returning HTTP error codes"],"whenToPreferThis":"Use this endpoint when you need to discover which websites are associated with a specific BuiltWith technology tag or IP attribute. Prefer this over general web scraping when you need structured, pre-indexed technology adoption data from BuiltWith's database. Best suited for competitive intelligence, lead generation by technology stack, or mapping IP addresses to hosted websites.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:30:51.232Z","isFirstParty":false}