--- title: "BuiltWith API: pricing, rate limits & MCP | ONEGTMLAB" description: "BuiltWith API: Website technology-detection database and API: what a domain runs (127,960 tracked technologies) with history and spend estimates, plus…" canonical: https://www.onegtmlab.dev/tool-directory/enrichment/builtwith --- # BuiltWith API: pricing, rate limits & MCP | ONEGTMLAB [](/) [ Book a call ](/book) ![](/_astro/builtwith.BMJrfeKy_2nt0nU.webp) API review # BuiltWith API review Website technology-detection database and API: what a domain runs (127,960 tracked technologies) with history and spend estimates, plus lists of every site using a technology. Best for front-end / web technographics per domain with first/last detected dates. Verified 25 Oct 2026 · 45 endpoints listed · Official MCP server [ See pricing ](#pricing)[ BuiltWith API docs ](https://api.builtwith.com/llms-full.txt) At a glance Category Enrichment, Sourcing, Signals Pricing model Per seat Free tier Free individual site lookups on the website forever Entry price $245.83/mo, billed annually Basic Auth API key Official MCP Yes Best for Front-end / web technographics per domain with first/last detected dates [builtwith.com ↗](https://builtwith.com)[Pricing page ↗](https://builtwith.com/plans) ## What a call costs The actions you pay for, as BuiltWith prices them. Action Cost Per Domain/Bulk/Relationships/Company-to-URL/Tags/Recommendations/Redirects/Keywords/Product/Trust/Vector/Ask lookup 1 credit VAT lookup that returns data 1 credit (0 if no data) Free, Trends, WhoAmI, Usage, MCP registry 0 credit X402 pay-per-call /agent/\* 0.0495 USD (USDC) per call ## Pricing, plan by plan US dollars, as BuiltWith's pricing page shows them on 25 Oct 2026. Monthly and annual billing are shown apart. Free tier Free individual site lookups on the website forever; API free endpoints: WhoAmI, Usage, Free API, Trends, MCP registry ### Basic $295/mo billed monthly $245.83/mo billed annually ($2,950 a year) 2 technologies, 2 keywords, 2 retail reports, 1 login, CRM integration ### Pro $495/mo billed monthly $412.50/mo billed annually ($4,950 a year) unlimited technologies, keywords, retail reports; 1 login ### Team $995/mo billed monthly $829.17/mo billed annually ($9,950 a year) unlimited; unlimited Pro logins (Team Ultra also available) ### API credits (account) [Price not verified](https://payments.builtwith.com/v1/mpp/catalog) minimum 2,000 credits, bought in 2,000 increments; exact tier price returned at checkout API included ### API credits (guest via Stripe MPP) [Price not verified](https://api.builtwith.com/llms-full.txt) 10+ credits at $0.0495 each up to 1,999 ($0.50 minimum); token valid 1-720 h API included ### x402 prepaid lookup units (Base USDC) One-off pack min 2,000 units; 2,000 = $99, 10,000 = $259; units never expire; tiers: 1-2000: $0.0495; 2001-10000: $0.0200; 10001-50000: $0.0100; 50001-150000: $0.0065; 150001-500000: $0.0045; 500001-1000000: $0.00710; 1000001-2000000: $0.00195; 2000001-5000000: $0.00190; 5000001-10000000: $0.00150; 10000001-+: $0.00100 API included Plans are monthly (min term 1 month) or yearly (min 1 year). Yearly USD prices (plans page price-toggle script): Basic $2,950/yr, Pro $4,950/yr, Team $9,950/yr, i.e. 10x the monthly price. The page also shows an INR approximation (₹28,009/mo Basic) because of our Indian IP; ignore it. Plans bought via MPP are non-recurring and last one calendar month. ## Rate limits Maximum 8 concurrent requests and 10 requests per second per key; HTTP 429 beyond. More on limitsLess The free 0-credit endpoints (Free API, Trends, WhoAmI, Usage, MCP registry) are rate limited to 1 request/sec per key instead. Dedicated endpoints by arrangement. ## How to get an API key BuiltWith uses API key. The steps below follow BuiltWith's own docs. 1. Create a BuiltWith account. API access starts on the API credits (account) plan. 2. BuiltWith account; or agent device-code flow (POST /agent-auth/start, user approves in browser) 3. Make a first call: Account limits, per-endpoint credit costs, batch sizes, privacy flags. Keep the key in an environment variable, never in the command. ``` curl -X GET "https://api.builtwith.com/whoamiv1/api.json" \ -H "Authorization: API $BUILTWITH_API_KEY" ``` ## Where the docs live What Where Documentation [api.builtwith.com](https://api.builtwith.com/) API reference [api.builtwith.com/llms-full.txt](https://api.builtwith.com/llms-full.txt) OpenAPI spec [api.builtwith.com/openapi.json](https://api.builtwith.com/openapi.json) llms.txt [api.builtwith.com/llms.txt](https://api.builtwith.com/llms.txt) Base URL `https://api.builtwith.com` MCP server `https://api.builtwith.com/mcp` SDKs builtwith-official-cli (npm, includes MCP stdio server) ## Strengths and limits ### Where it fits - Front-end / web technographics per domain with first/last detected dates - Prospect lists of sites using technology X with spend, revenue and employee filters - Ecommerce research (product, SKU, sales revenue) - Tech adds/removals (Change API) and a WebSocket live feed of new detections ### Where it falls short - Back-end or internal tools that leave no web footprint (use job-post technographics: TheirStack, PredictLeads) - Contact data - Cheap self-serve list pulls: Lists and Keyword Search need a $295+/month plan ### Worth knowing - Lists API and Keyword Search API require a subscription; buying lookup credits does not unlock Lists. - Bulk job results are deleted after the first successful read: store them immediately. - Relationships API charges again if the 10-minute cache expires or the request hits another server. - Only 10 req/s and 8 concurrent per key. - Validate TECH names for free with the Trends API before paying for Lists calls. 5 moreShow fewer - Account credit purchases have a 2,000-credit minimum; tier prices for accounts are not published, only returned at checkout. - x402 descriptor lists the 500,001-1,000,000 tier at $0.00710/unit, higher than the 150,001-500,000 tier ($0.0045): looks like a vendor typo, confirm via x402-pricing before buying. - No sandbox: testing hits production with a real key. - Terms: API access restricted to licensed Customers; internal business use only; no resale, no providing BuiltWith data to third-party data providers or analytics platforms, no bulk extraction beyond licensed datasets, no training competing AI. - Minimum term 1 month (monthly) or 1 year (yearly); cancellation keeps the plan active to the end of the term. ## Who should use it Use BuiltWith for Front-end / web technographics per domain with first/last detected dates Look elsewhere for Back-end or internal tools that leave no web footprint (use job-post technographics: TheirStack, PredictLeads) ## If BuiltWith is not the answer Other Enrichment tools in this directory, each with its own review. [ ![](/_astro/bettercontact.DR_th9s7_1Gi35o.webp) BetterContact Enrichment From $15/mo Best for one-bill access to 20+ email/phone providers without holding their keys. BetterContact API review →](/tool-directory/enrichment/bettercontact)[ ![](/_astro/clearbit.7WpkIFNS.svg) Clearbit Enrichment Best for existing Clearbit API customers maintaining legacy integrations. Clearbit API review →](/tool-directory/enrichment/clearbit-hubspot)[ ![](/_astro/findymail.BKowYsnX_Zgvyr9.webp) Findymail Enrichment From $41/moOfficial MCP Best for high-value contacts where a contractual <5% bounce guarantee matters. Findymail API review →](/tool-directory/enrichment/findymail) ## Before you build Four things to settle first, each read off BuiltWith's own pages. - **Confirm the API is on your plan**API access starts on the API credits (account) plan. Free tier: Free individual site lookups on the website forever. - **Keep the key out of your code**API key. - **Design around the rate limit**Maximum 8 concurrent requests and 10 requests per second per key; HTTP 429 beyond. - **Know the catch before you scale**Lists API and Keyword Search API require a subscription; buying lookup credits does not unlock Lists. ## Want us to build it for you? Tell us what you want BuiltWith to do in your stack. We will show you how we would wire it into your data, outbound or CRM, and what we would check first. [ Book a call ](/book)[ See case studies ](/case-studies) Read from [builtwith.com/plans](https://builtwith.com/plans) and [api.builtwith.com/llms-full.txt](https://api.builtwith.com/llms-full.txt). Verified 25 Oct 2026. All 45 endpointsFor developers: method, path, what it does and what it costs. **Base URL:** [api.builtwith.com](https://api.builtwith.com) **Bulk and async:** Bulk Domain API up to 5,000 domains per job (async 202 + polling); results deleted after first read. Datasets sold separately. **Webhooks:** No webhooks documented; Live Feed is a WebSocket (wss://sync.builtwith.com) requiring an active plan Filter endpoints 45 endpoints Method Path What it does Cost GET `/whoamiv1/api.json` Account limits, per-endpoint credit costs, batch sizes, privacy flags 0 GET `/usagev2/api.{json|xml}` Credit balance 0 GET `/v26/api.{json|xml|csv|xlsx}` Domain API: technologies (with confidence 0-1), first/last detected, spend history, company meta 1 credit per domain; TRUST=yes adds 1 POSTasync `/v23/domain/bulk` Bulk Domain submit 1 credit per domain GETasync `/v23/domain/bulk/{job_id}` Bulk job status 0 GETasync `/v23/domain/bulk/{job_id}/result` Bulk job result (deleted after first successful read) Not stated GET `/change1/api.json` Technology additions/removals Not stated GET `/lists13/api.{json|xml|txt|csv|tsv}` Sites using a technology (prospect lists) requires a subscription (see WhoAmI credits.costs.lists\_api) GET `/ask1/api.{json|xml|txt|csv|tsv}` Natural-language website list lookups 1 credit per query GET `/rv5/api.{json|xml|csv|tsv}` Relationships between sites (shared analytics IDs, hosting, ownership) 1 credit per key/domain across pages while 10-minute cache is active GET `/free1/api.{json|xml}` Summary counts and update ranges by technology group 0 GET `/ctu3/api.{json|xml}` Company name to domains 1 per lookup GET `/tag1/api.{json|xml}` Domains related to IPs and attributes 1 per lookup GET `/rec1/api.{json|xml}` Technology recommendations for a domain 1 per lookup GET `/redirect1/api.{json|xml}` Live and historical redirects 1 per lookup GET `/kw2/api.{json|xml}` Keywords for a domain 1 per lookup GET `/kws1/api.{json|csv}` Websites containing a keyword requires a subscription (see WhoAmI credits.costs.keyword\_search\_api) GET `/trends/v6/api.{json|xml}` Technology trend metadata; validates TECH names 0 GET `/productv1/api.json` Websites selling a product 1 per lookup GET `/trustv2/api.{json|xml}` Trust/fraud signals and content-safety flags 1 per lookup (+1 for LIVE) GET `/vector/v1/api.{json|xml|csv}` Semantic search over technologies/categories 1 per search GET `/vat1/api.{json|xml|csv}` VAT/GSTIN/CNPJ and other registration numbers 1 per domain that returns data; 0 otherwise GET `/mcp2/api.{json|xml|csv|txt}` Search BuiltWith's registry of remote MCP servers 0 WSS `wss: //sync.builtwith.com/wss/new` Live Feed of new detections (or /wss/channel/) requires active plan; trial users get redacted domains POST `https://api.builtwith.com/agent-auth/start` Agent device-code auth start 0 POST `https://api.builtwith.com/agent-auth/token` Poll for temporary bw- token (24h) 0 GET `https://payments.builtwith.com/v1/billing/api-discovery` Credit totals (Agent Billing Key) 0 GET `https://payments.builtwith.com/v1/billing/api-configuration` Spending limits 0 POST `https://payments.builtwith.com/v1/billing/api-purchase` Buy account credits on saved Stripe card charges card GET `https://payments.builtwith.com/v1/mpp/catalog` Stripe MPP catalog (guest purchase) 0 POST `https://payments.builtwith.com/v1/mpp/purchase` Stripe MPP purchase guest: $0.0495 per credit, $0.50 minimum GET `/agent/domain` x402 pay-per-call: Look up a domain's technologies and metadata $0.0495 USDC per call (x402, no account) POST `/agent/relationships` x402 pay-per-call: Find websites related to a domain $0.0495 USDC per call (x402, no account) POST `/agent/changes` x402 pay-per-call: Get technology additions and removals for a domain $0.0495 USDC per call (x402, no account) POST `/agent/company-domains` x402 pay-per-call: Find domains associated with a company name $0.0495 USDC per call (x402, no account) POST `/agent/tags` x402 pay-per-call: Find related domains from an IP address or attribute $0.0495 USDC per call (x402, no account) POST `/agent/recommendations` x402 pay-per-call: Recommend technologies for a domain $0.0495 USDC per call (x402, no account) POST `/agent/redirects` x402 pay-per-call: Get live and historical redirects for a domain $0.0495 USDC per call (x402, no account) POST `/agent/keywords` x402 pay-per-call: Get keyword data for a domain $0.0495 USDC per call (x402, no account) POST `/agent/trust` x402 pay-per-call: Get trust and risk signals for a domain $0.0495 USDC per call (x402, no account) [](/) © 2026 ONEGTMLAB Private Limited. 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