{"id":"994c40f3-758d-4f89-8415-ead8d4c7e955","shortId":"Ev6zXA","kind":"mpp","title":"Look up domains associated with an IP address or attribute tag via BuiltWith's Tags API.","tagline":"Look up domains associated with an IP address or attribute tag via BuiltWith's Tags API.","description":"The BuiltWith Tags endpoint (`/builtwith/tags`) lets you query BuiltWith's technology profiling database by IP address or attribute identifier. You supply a LOOKUP value — either an IP address (prefixed with \"IP-\") or an attribute string — and receive back the associated domain and technology tag data. This is useful for reverse-IP lookups, discovering which websites share hosting infrastructure, or finding domains linked by a common attribute across BuiltWith's index of 100M+ websites.\n\nThis endpoint is part of a broader BuiltWith suite exposed through the Locus MPP (Micropayment Protocol) gateway. Each call costs 55,000 base units of pathUSD (6 decimals), which works out to $0.055 per request, settled on Tempo L2. The payment intent is \"charge\", meaning each request is a one-shot micropayment. The endpoint accepts POST requests with a JSON body containing a required `LOOKUP` field.\n\nOther endpoints in the same BuiltWith suite include domain tech-stack lookup, technology lists, domain relationships, company-to-URL resolution, product search, trends, trust signals, keywords, redirects, recommendations, and a cheaper free-summary tier. All are accessible at the same `builtwith.mpp.paywithlocus.com` host under different paths.","tags":["technology-profiling","tech-stack","competitive-intel","domains"],"capabilities":["reverse-ip-lookup","attribute-tag-lookup","technology-profiling","domain-discovery","micropayment-per-call","tempo-l2-settlement"],"categories":["data","search"],"synonyms":["BuiltWith tags","reverse IP lookup","IP to domain","attribute lookup","technology tags","BuiltWith API","website profiling","domain intelligence","IP domain mapping"],"warnings":["Probe used HEAD/GET which returned 404; the endpoint is POST-only per the OpenAPI spec, so liveness could not be confirmed via the probe.","No response schema or example response is provided in the OpenAPI spec.","Currency address 0x20c000000000000000000000b9537d11c60e8b50 is assumed to be pathUSD with 6 decimals based on the Tempo/Locus convention; if decimals differ, the stated price of $0.055 would be incorrect."],"endpointUrl":"https://builtwith.mpp.paywithlocus.com/builtwith/tags","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":"0.520","qualityRationale":"The OpenAPI spec provides a clear request schema and pricing, but the probe did not capture a live 402 challenge on HEAD/GET (the endpoint requires POST). No response schema or example response is documented. Crawled pages all return 404 since only path-specific POST routes are 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'0.055':139 '000':128 '100m':105 '55':127 '6':133 'BuiltWith API' 'BuiltWith tags' 'IP domain mapping' 'IP to domain' 'accept':162 'access':213 'across':100 'address':8,24,48,60 'api':16,32 'associ':4,20,72 'attribut':10,26,50,66,99 'attribute lookup' 'attribute-tag-lookup' 'back':70 'base':129 'bodi':168 'broader':113 'builtwith':13,29,34,41,101,114,179 'builtwith.mpp.paywithlocus.com':217 'call':125 'charg':150 'cheaper':206 'common':98 'compani':192 'company-to-url':191 'contain':169 'cost':126 'data':77 'databas':45 'decim':134 'differ':220 'discov':86 'domain':3,19,73,94,182,189 'domain intelligence' 'domain-discovery' 'either':57 'endpoint':36,108,161,175 'expos':116 'field':173 'find':93 'free':208 'free-summari':207 'gateway':123 'host':90,218 'identifi':51 'includ':181 'index':103 'infrastructur':91 'intent':148 'ip':7,23,47,59,63,84 'json':167 'keyword':201 'l2':145 'let':38 'link':95 'list':188 'locus':119 'look':1,17 'lookup':55,85,172,186 'mean':151 'micropay':121,159 'micropayment-per-call' 'mpp':120 'one':157 'one-shot':156 'part':110 'path':221 'pathusd':132 'payment':147 'per':140 'post':163 'prefix':61 'product':196 'profil':44 'protocol':122 'queri':40 'receiv':69 'recommend':203 'redirect':202 'relationship':190 'request':141,153,164 'requir':171 'resolut':195 'revers':83 'reverse IP lookup' 'reverse-ip':82 'reverse-ip-lookup' 'search':197 'settl':142 'share':89 'shot':158 'signal':200 'stack':185 'string':67 'suit':115,180 'summari':209 'suppli':53 'tag':11,15,27,31,35,76 'tech':184 'tech-stack':183 'technolog':43,75,187 'technology tags' 'technology-profiling' 'tempo':144 'tempo-l2-settlement' 'tier':210 'trend':198 'trust':199 'unit':130 'url':194 'use':80 'valu':56 'via':12,28 'websit':88,106 'website profiling' 'work':136","prices":[{"id":"dfeb5487-9e99-412b-a664-93f146f12c36","listingId":"994c40f3-758d-4f89-8415-ead8d4c7e955","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":"Tags"},"asset_contract":"0x20c000000000000000000000b9537d11c60e8b50"},"createdAt":"2026-04-18T20:00:51.079Z"}],"sources":[{"listingId":"994c40f3-758d-4f89-8415-ead8d4c7e955","source":"mpp_dev","sourceId":"builtwith:POST:/builtwith/tags","sourceUrl":"https://mpp.dev/api/services","isPrimary":true,"firstSeenAt":"2026-04-18T20:00:51.079Z","lastSeenAt":"2026-04-22T04:15:12.530Z"}],"details":{"listingId":"994c40f3-758d-4f89-8415-ead8d4c7e955","quickStartSnippet":"curl -X POST https://builtwith.mpp.paywithlocus.com/builtwith/tags \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"LOOKUP\": \"IP-93.184.216.34\"}'","exampleRequest":{"LOOKUP":"IP-93.184.216.34"},"exampleResponse":null,"schema":{"path":"/builtwith/tags","method":"POST","payment":{"amount":"55000","intent":"charge","method":"tempo","currency":"0x20c000000000000000000000b9537d11c60e8b50","decimals":6,"unitType":"request","description":"Tags"},"description":"Tags"},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The /builtwith/tags endpoint accepts POST with a required LOOKUP field (IP address prefixed with 'IP-' or attribute).","source_url":"https://builtwith.mpp.paywithlocus.com"},{"claim":"Each call costs 55,000 base units settled via Tempo L2 with intent 'charge'.","source_url":"https://builtwith.mpp.paywithlocus.com"},{"claim":"BuiltWith covers 100M+ websites for technology profiling.","source_url":"https://builtwith.mpp.paywithlocus.com"},{"claim":"API reference available at https://api.builtwith.com and LLM docs at https://beta.paywithlocus.com/mpp/builtwith.md","source_url":"https://builtwith.mpp.paywithlocus.com"}],"useCases":["Reverse-IP lookup to find all domains hosted on a given IP address","Discover domains sharing a common BuiltWith attribute or tag","Enrich threat-intelligence or security workflows with hosting infrastructure data","Competitive analysis by identifying co-hosted or related websites","Automated infrastructure mapping for sales prospecting"],"bestFor":["Security researchers performing reverse-IP reconnaissance","Sales and marketing teams mapping competitor infrastructure","Data enrichment pipelines needing IP-to-domain resolution","Agents that need per-call pay-as-you-go access to BuiltWith without a subscription"],"notFor":["Full tech-stack profiling of a single domain (use the /builtwith/domain endpoint instead)","Bulk technology adoption trend analysis (use /builtwith/trends instead)","Users who need free access — every call costs $0.055"],"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":"2026-04-22T04:15:12.530Z"}}