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BuiltWith

by io.github.builtwith
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Official BuiltWith tools for website technologies, company research, relationships, and trends.

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Status
Healthy
Uptime
100.0% over the last 24 hours
Last Tested
Transport
Streamable HTTP · MCP 2025-11-25
URL
Repository
builtwith/builtwith-mcp
GitHub Stars
43
Server Listing
BuiltWith MCP
ChatGPT
–
Claude
–

TDQS

C2.9/5.0

Scored across 51 tools

Disambiguation2/5

Many tools are near-duplicates of the same lookup under different billing/auth modes: domain-api, domain-api-json, domain-lookup, x402-domain-api, x402-domain-api-json, and x402-domain-lookup all overlap heavily, as do the ask, list, keywords, and other API families. Descriptions add context, but choosing the right tool depends on payment/account state rather than a clearly distinct purpose, creating high misselection risk.

Naming Consistency3/5

Most names follow a kebab-case resource/API pattern, which is readable and predictable at a high level. However, the set mixes prefixes such as x402-, mpp-, payment-, free-, and mcp-, plus redundant suffixes like -json and -lookup, so the convention is not fully consistent.

Tool Count2/5

With 51 tools, the surface is very large for an agent-facing server and is inflated by duplicate variants for different payment/auth paths. While BuiltWith has broad API coverage, many tools do not earn a distinct place when the same underlying operation appears in standard, raw JSON, lookup, and x402 forms.

Completeness5/5

The tool set comprehensively covers BuiltWith's domain: technology lookups, lists, keywords, redirects, relationships, trust, tags, recommendations, trends, products, VAT, vector search, MCP registry browsing, account introspection, and multiple payment/credit flows. There are no obvious missing lifecycle operations for this lookup-and-billing domain.

Available Tools

51 tools
ask-apiAsk APICInspect

Ask API lookup for natural language website list queries. OpenAI requests are served as preview results and do not commit full reports.

Inputs: query (required), meta, commit, nextOffset. Returns: count, query, sites, committed, +3 more

ask-api-jsonRaw Ask API JSONCInspect

Raw Ask API JSON lookup for app/internal use. OpenAI requests never send COMMIT=true.

Inputs: query (required), meta, commit, nextOffset.

change-apiBInspect

Change API JSON lookup for technology additions and removals by domain. Supports one or more comma-separated domains and optional natural language SINCE values such as 'last month'.

Inputs: lookup (required), since.

company-to-urlCInspect

Company to URL API JSON lookup for domains from a company name.

Inputs: company (required).

domain-apiDomain APICInspect

Domain API JSON lookup for technology and metadata by domain.

Inputs: lookup (required). Returns: count, domain, profile, technologies

domain-api-jsonCInspect

Raw Domain API JSON lookup for technology and metadata by domain.

Inputs: lookup (required).

domain-lookupDomain TechnologiesCInspect

Returns the live web technologies used on the root domain name.

Inputs: domain (required), liveOnly. Returns: count, domain, profile, technologies

free-apiCInspect

Free API JSON lookup for category/group counts by domain.

Inputs: lookup (required).

keywords-apiCInspect

Keywords API JSON lookup for keyword data by domain.

Inputs: lookup (required).

keywords-search-apiAInspect

Keyword Search API — find websites containing a specific keyword. Returns a list of matching domains and a NextOffset value for pagination. Costs API credits per query.

Inputs: keyword (required), limit, offset.

list-apiBInspect

List API JSON lookup for websites using a primary technology. Requires an active BuiltWith plan. OTHERTECHS are subordinate filters and do not consume additional primary technology report slots.

Inputs: tech (required), all, bws, sku, +19 more.

mcp-list-apiAInspect

Search and browse remote MCP servers in the BuiltWith MCP registry (v2). Requires a BuiltWith API key supplied as a bearer token. Provide search, category, or both. Returns up to 100 results per page as a JSON array of {Domain, Category, Description, Endpoints: [{Endpoint, AuthRequired, Tools: [{Name, Description}]}], first_detected, last_detected}, and preserves the complete API response including any fields added in the future. Uses no API credits.

Inputs: offset, search, category.

mcp-list-categoriesAInspect

List valid BuiltWith MCP registry category slugs, labels, and entry counts (v2). This public endpoint requires no API key and uses no API credits.

Inputs: no named parameters.

mpp-catalogC
Read-only
Inspect

Discover Stripe card MPP payments without an existing BuiltWith account or API key. The smallest purchase is $0.50 for 10 API lookups. Guest access tokens default to 24 hours; request up to 720 hours before paying. Lists require a plan.

Inputs: no named parameters.

mpp-dataBInspect

Use the temporary access_token returned by mpp-purchase without configuring an API key. Domain and change lookups spend one purchased API credit per domain. Lists require a purchased basic/pro/team plan, not lookup credits. Reuse the token for further calls until expiry or credit exhaustion.

Inputs: operation (required), accessToken (required), since, domain, +5 more.

mpp-purchaseA
Destructive
Inspect

Buy API lookup credits or a one-off plan with Stripe MPP card payment. No BuiltWith API key required. Start without paymentCredential to get a 402 challenge; use an MPP-compatible Stripe wallet to authorize it, then retry the IDENTICAL purchase with paymentCredential. Keep the random UUID idempotencyKey secret and reuse it for retries/status, never for a different purchase. Success returns access_token for mpp-data or Bearer authentication on this MCP connection. This charges only the supplied SPT, never a saved card.

Inputs: product (required), idempotencyKey (required), credits, tokenHours, +1 more.

payment-balanceAInspect

Check an existing account's API-credit balance through the saved-Stripe-method top-up service. This is not x402.

Inputs: billingKey.

payment-configBInspect

Retrieve saved-Stripe-method account top-up limits, UTC monthly period, purchase increment, and idempotency rules. This is not x402.

Inputs: billingKey.

payment-purchaseA
Destructive
Inspect

Charge an existing account's saved Stripe payment method and add account API credits. This is not x402. Requires the separately scoped Agent Billing Key, fixed 2,000-credit increments, and an idempotency key.

Inputs: credits (required), billingKey (required), idempotencyKey (required).

product-apiCInspect

Product API JSON lookup for ecommerce product searches.

Inputs: query (required).

recommendations-apiCInspect

Recommendations API JSON lookup for technology recommendations by domain.

Inputs: lookup (required).

redirects-apiAInspect

Redirects API JSON lookup for live and historical redirects by domain.

Inputs: lookup (required).

relationships-apiCInspect

Relationships API JSON lookup for related websites by domain.

Inputs: lookup (required).

tags-apiCInspect

Tags API JSON lookup for related domains from IP or attributes.

Inputs: lookup (required).

trends-apiCInspect

Trends API JSON lookup for technology trend data.

Inputs: tech (required).

trust-apiCInspect

Trust API JSON lookup for trust scoring by domain.

Inputs: lookup (required).

usage-apiBInspect

Usage API JSON lookup for current credit balance (used, purchased, remaining). Uses no API credits.

Inputs: no named parameters.

vat-apiAInspect

VAT API JSON lookup for VAT, GST, CNPJ, ABN, and other publicly displayed company registration numbers associated with websites. Accepts 1–16 comma-separated domains. Uses 1 API credit only for each domain that returns registration data; domains with no results use no credits. Returned identifiers are found on public websites and are not verified or validated by BuiltWith.

Inputs: lookup (required).

vat-types-apiAInspect

List every company registration type that the VAT API may return, including its code, friendly name, and description. This public endpoint requires no API key and uses no API credits.

Inputs: no named parameters.

vector-apiAInspect

Search BuiltWith technologies and categories by text query using vector similarity. Returns ranked results with similarity scores (0–1), descriptions, and category info. Useful for discovering what technologies match a concept or description (e.g. 'react framework', 'payment gateway', 'live chat'). Costs 1 API credit per query.

Inputs: query (required), limit.

whoami-apiAInspect

WhoAmI API JSON lookup for account limits, credit costs, privacy flags, max batch sizes, and endpoint inventory. Uses no API credits. Call this first to make account-aware decisions.

Inputs: no named parameters.

x402-ask-apiAInspect

Natural-language website query using one prepaid credit. Committed reports and pagination also require a Basic or Pro List pass.

Inputs: payer (required), query (required), creditKey (required), meta, +3 more.

x402-change-apiBInspect

Technology additions and removals for one or more comma-separated domains. Deducts prepaid credits from a reusable key.

Inputs: lookup (required), creditKey (required), since.

x402-company-to-urlBInspect

Domains associated with a company name. Deducts prepaid credits from a reusable key.

Inputs: company (required), creditKey (required).

x402-credit-balanceBInspect

Check purchased, used, pending, and available credits for a reusable prepaid key. Uses no payment and consumes no credits.

Inputs: creditKey (required).

x402-credit-purchaseA
Destructive
Inspect

Purchase a batch of at least 2,000 non-expiring BuiltWith API credits with one x402 payment. Returns a reusable secret credit key; provide an existing key to top it up.

Inputs: payer (required), credits (required), creditKey.

x402-domain-apiCInspect

Domain API technology and metadata lookup for one domain using one prepaid credit.

Inputs: lookup (required), creditKey (required).

x402-domain-api-jsonCInspect

Raw Domain API JSON lookup for one or more comma-separated domains. Deducts prepaid credits from a reusable key.

Inputs: lookup (required), creditKey (required).

x402-domain-lookupBInspect

Returns live web technologies for one domain using one prepaid credit.

Inputs: domain (required), creditKey (required), liveOnly.

x402-keywords-apiCInspect

Keyword data for a domain. Deducts prepaid credits from a reusable key.

Inputs: lookup (required), creditKey (required).

x402-keywords-search-apiBInspect

Search websites containing a keyword with a valid x402 List pass.

Inputs: payer (required), keyword (required), passToken (required), limit, +1 more.

x402-list-apiBInspect

List websites using a primary technology with a valid x402 List pass. OTHERTECHS are subordinate filters and never consume additional technology report slots.

Inputs: tech (required), payer (required), passToken (required), all, +21 more.

x402-list-pass-purchaseA
Destructive
Inspect

Purchase a 30-day Basic ($295, 2 technology and 2 keyword reports) or Pro ($495, 50 and 50) List API pass with Base USDC.

Inputs: tier (required), payer (required).

x402-pricingCInspect

Show prepaid batch-credit pricing, x402 configuration, and List pass tiers. Optionally quote a credit quantity. Uses no payment.

Inputs: credits.

x402-recommendations-apiCInspect

Technology recommendations for a domain. Deducts prepaid credits from a reusable key.

Inputs: lookup (required), creditKey (required).

x402-redirects-apiCInspect

Live and historical redirects for a domain. Deducts prepaid credits from a reusable key.

Inputs: lookup (required), creditKey (required).

x402-relationships-apiAInspect

Related websites for a domain. Deducts prepaid credits from a reusable key.

Inputs: lookup (required), creditKey (required).

x402-tags-apiCInspect

Related domains from an IP address or attributes. Deducts prepaid credits from a reusable key.

Inputs: lookup (required), creditKey (required).

x402-trust-apiCInspect

Trust score for a domain. Deducts prepaid credits from a reusable key.

Inputs: lookup (required), creditKey (required).

x402-vat-apiAInspect

Public company registration identifiers for one to sixteen domains. Deducts prepaid credits from a reusable key.

Inputs: lookup (required), creditKey (required).

x402-vector-apiBInspect

Vector similarity search across BuiltWith technologies and categories. Deducts prepaid credits from a reusable key.

Inputs: query (required), creditKey (required), limit.

Tool Schema Changelog

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