BuiltWith Domain API
Agent-ready OpenAPI document · curated by JenticData EnrichmentCompany DataapiKey11 EndpointsREST
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For Agents
Look up the technology stack, social profiles, redirects, and trust score for any domain across 11 BuiltWith endpoints.
Use for: I need to look up the tech stack of example.com, Find every domain currently running Shopify, Resolve the company name Acme Inc to its primary domain, Check whether a target uses Google Analytics 4
Not supported: Does not handle email enrichment, contact data, or company financials - use for domain technology profiles, technographic lists, trends, and trust scores only.
Jentic maintains a curated, agent-optimized OpenAPI specification for BuiltWith Domain API, validated against the live API and kept agent-ready. The OpenAPI document BuiltWith publishes itself describes a different BuiltWith API, not these domain lookup operations, so this page is built from the Jentic specification. BuiltWith maintains one of the largest technographic datasets on the web - every detected analytics, ad, framework, hosting, and ecommerce technology powering a domain. The Domain API exposes the same lookup surface as the public site plus relationships, technology trends, keyword detection, redirects, social profiles, and a trust score. Use it to enrich CRM records with tech stack data, build account scoring for outbound, monitor competitor tech changes, or qualify leads by what they currently run.
Install Jentic One Beta
Connect the BuiltWith Domain API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the BuiltWith Domain API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fbuiltwith.com%2Fbuiltwith" | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2Fbuiltwith.com%2Fbuiltwith" | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with BuiltWith Domain API.
Pull the full technology profile detected on a target domain
Run a lightweight free lookup that returns just core technology categories
Discover the domain relationships graph linking related and reseller sites
List every domain that uses a specific technology with the technology list endpoint
Trace a company name to its primary website with the company-to-URL lookup
Read trend data showing technology adoption and decline over time
Fetch the keywords, social media handles, redirects, and trust score for a domain
Use Cases
Patterns agents use BuiltWith Domain API for, with concrete tasks.
★ Outbound Lead Qualification
Enrich every inbound lead with the tech stack of their company website. The agent calls GET /v22/api.json with the lead's domain and parses the technology categories to flag whether the prospect is on a competing platform, a complementary tool, or runs nothing relevant. This routes the lead to the right rep with the right talk track.
For domain example.com, fetch the BuiltWith profile and tag the lead with categories analytics, e-commerce, and marketing-automation tech detected.
Account Scoring by Tech Fit
Score target accounts based on the technologies they already run. GET /lists8/api.json returns every domain using a specific technology, letting you build a scoring model that boosts accounts already running a complementary stack. Combine it with /trust2/api.json to filter out low-trust domains automatically.
List domains using Salesforce, score each by trust, and post the top 50 to a Salesforce campaign as target accounts.
Competitive Tech Monitoring
Track when competitors add or remove a technology. Run a daily script that compares today's GET /v22/api.json snapshot for a watchlist of competitor domains against yesterday's, and alert on any changes. The trends endpoint provides longitudinal data so the same workflow can show category-level adoption over months.
Compare today's BuiltWith profile for competitor.com against yesterday's stored snapshot and alert Slack on any added or removed technologies.
AI Agent Account Researcher via Jentic
An SDR agent connected via Jentic can answer the question what does this prospect run before drafting an outbound email. The agent searches Jentic for tech stack lookup, loads the GET /v22/api.json schema, and executes against the operator's vault-stored BuiltWith key, returning a structured tech list ready for prompt context.
Search Jentic for tech stack lookup, load the GET /v22/api.json schema, and return the full technology profile for the domain in the user's prompt.
Key Endpoints
11 endpoints — jentic maintains a curated, agent-optimized openapi specification for builtwith domain api, validated against the live api and kept agent-ready.
METHOD
PATH
DESCRIPTION
GET
/v22/api.json
Get full technology profile for a domain
GET
/free1/api.json
Free-tier lightweight technology lookup
GET
/lists8/api.json
List domains using a specific technology
GET
/ctu2/api.json
Company name to URL lookup
GET
/trends3/api.json
Technology adoption trends
GET
/social2/api.json
Social media profiles for a domain
GET
/trust2/api.json
Trust score for a domain
GET
/v22/api.json
Get full technology profile for a domain
GET
/free1/api.json
Free-tier lightweight technology lookup
GET
/lists8/api.json
List domains using a specific technology
GET
/ctu2/api.json
Company name to URL lookup
GET
/trends3/api.json
Technology adoption trends
GET
/social2/api.json
Social media profiles for a domain
GET
/trust2/api.json
Trust score for a domain
Why Jentic?
What agents get from Jentic-routed access to this vendor.
Setup
Wiring BuiltWith by hand means learning its KEY query-parameter auth against api.builtwith.com and picking the right versioned path for lookups, lists, trends, and trust yourself. Through Jentic you install once, import BuiltWith from the API Directory, store the key once, and your agent calls it.
Permission scoping
BuiltWith takes the target domain as a query parameter rather than a URL path segment, so scope the agent by the operations it needs, such as looking up a domain's tech stack or reading trends. Because you choose the allowed operations, it can run domain profiles without being able to pull technology lists unless you add that.
Credential isolation
Your BuiltWith API key is stored once, encrypted, by your own Jentic One instance and appended as the KEY query parameter at execution time. It never enters the agent's prompt, logs, or context.
Intent-based discovery
Agents search Jentic by intent such as 'look up a domain tech stack' or 'list domains using a technology', and Jentic returns the matching BuiltWith operation with its input schema so the agent calls the right endpoint without browsing the reference docs.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using BuiltWith Domain API through Jentic.
Which OpenAPI specification does this BuiltWith Domain API page describe?
A curated, agent-optimized Jentic specification covering 11 BuiltWith Domain API operations, validated against the live API and kept up to date. BuiltWith does publish an official OpenAPI 3.1.0 document at https://api.builtwith.com/mppx/openapi.json, but it describes the separate BuiltWith Agent Stripe Credit Top-Up API and its three mppx endpoints, not the domain lookup endpoints on this page. The Jentic variant covers the domain profile, technology list, company-to-URL, trends, social, redirect, and trust operations with agent-ready input schemas. Get started with Jentic One, the self-hosted execution layer.
What authentication does the BuiltWith Domain API use?
BuiltWith uses an API key passed as the KEY query parameter, or alternatively as Authorization: API {key} in the header. Through Jentic, the key is stored encrypted in the vault and attached to each request at execution time, never exposed to the agent.
Can I list every domain that uses a specific technology?
Yes. GET /lists8/api.json takes a technology name and returns the set of domains BuiltWith has detected running it. Use it to seed account lists for outbound or to size the addressable market for a category.
Can the BuiltWith API resolve a company name to a website?
Yes. GET /ctu2/api.json takes a company name and returns the most likely primary website plus any matched aliases. Pair it with /v22/api.json to immediately enrich the resolved domain with its tech stack.
What are the rate limits for the BuiltWith Domain API?
BuiltWith rate-limits per plan tier and per endpoint, with stricter limits on the free lookup. The OpenAPI spec does not encode the exact quotas - add retry-with-backoff for HTTP 429 responses and prefer the paid /v22/api.json for production volume.
How do I look up a tech stack from an AI agent through Jentic?
Run pip install jentic and authenticate with your ak_* key. Search Jentic with tech stack lookup, load the GET /v22/api.json operation, and execute it with the LOOKUP query parameter set to the target domain. Jentic injects the BuiltWith API key automatically.
Can I limit what my agent is allowed to do with the BuiltWith Domain API?
Yes. Jentic One runs self-hosted, so your own rules decide which BuiltWith operations and credentials the agent may use. Because BuiltWith takes the target domain as a query parameter, you scope the agent by the operations it needs, such as letting it fetch a domain's full technology profile with GET /v22/api.json while withholding the technology-list lookup at GET /lists8/api.json. You can also allow the company-to-URL and trust-score endpoints selectively, and your BuiltWith key is only attached to the calls you have permitted.
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