Look up the technologies behind any website, discover its subdomains, verify an email address, and build technographic lead lists.
Wappalyzer ships in the w6w first-party pack. It declares 9 actions, 2 health checks, and the host runs its code in a sandbox that never sees the credential.
io.w6w.wappalyzerWappalyzer identifies the technologies used on public websites — CMSs, ecommerce platforms, analytics tools, web frameworks, CRMs, CDNs and more — and packages that data into lookup, technographic prospecting, enrichment and monitoring workflows.
The core of this app is the Lookup API: point it at up to ten URLs and get back the detected technology stack for each, either from Wappalyzer’s own dataset (fast, cached) or from a fresh live crawl. Around that sit three more real, documented endpoints — subdomain discovery for mapping a company’s web footprint, email verification for keeping bad addresses out of an outreach workflow, and lead lists for turning “which companies use Shopify” into a downloadable prospect set.
Every endpoint, field and header here — including the exact 403 behaviour, the credit-accounting headers on every response, and the async crawl/callback lifecycle — was verified against Wappalyzer’s own published OpenAPI 3.1 contract and live probes against api.wappalyzer.com, not a third-party integration directory.
Three routes to the same 9 actions. The Workflow tab is generated from Wappalyzer's own manifest and carries its real ids, so it is copy-pasteable; the Code and CLI examples are the same call for any action on any app, so every app-specific value in them is a blank you fill in.
credits-balance-get Check the account's remaining credit balance without spending any credits.
lists-create Create a lead list from technology, keyword and company filters. Free to create; the result is priced and generated asynchronously (poll Get Lead List or use a callback URL).
lists-finalize Spend credits to finalize a Ready lead list and unlock its full download URL.
lists-get Fetch a lead list's full detail by ID — filters, status, pricing, and download URLs once ready.
lists-list List the lead lists this account has created, with status, pricing and size.
lookup Look up the technologies detected on up to ten websites, from Wappalyzer's own dataset or a live scan.
verify-email Check an email address's deliverability — reachability, disposable/role-account/catch-all detection, MX and SMTP-connection validity.
A workflow step names the app and the action, and the editor fills in the
connection when you pick one. This is the Step shape from the
workflow spec, carrying Wappalyzer's real ids.
{
"manifestVersion": "2",
"name": "wappalyzer-example",
"steps": [
{
"id": "lists-finalize",
"uses": {
"app": "io.w6w.wappalyzer",
"action": "lists-finalize",
"connection": "conn_YOUR_CONNECTION_ID"
},
"with": {
"id": "<id>",
"spendCredits": "<spendCredits>"
}
}
]
}lists-finalize credits-balance-get lists-create lists-get lists-list +4 more actions available
Every app-specific value here is a blank you have to fill in. An
app action is reached through the connection that authenticates it, so the
address is a connection id, not the app id — and connections belong to your account,
so a public page cannot know yours. Create one for Wappalyzer, then fill in
the three blanks: conn_YOUR_CONNECTION_ID, the action key, and the
parameters that action declares. The call itself is real — the shape is transcribed
from the studio's own snippet builder, which prints the same kind of blanks — but
nothing in it is specific to Wappalyzer. The Workflow tab is where this app's
real ids are.
npm install @w6w/sdkyarn add @w6w/sdkpnpm add @w6w/sdkdeno add npm:@w6w/sdkimport { W6wClient, isActionRun } from "@w6w/sdk";
// Reads W6W_BASE_URL and W6W_TOKEN from the environment when omitted.
const client = new W6wClient();
const envelope = await client.run({
urn: "conn_YOUR_CONNECTION_ID",
action: "lists-finalize",
payload: {
id: "<value>",
spendCredits: "<value>",
},
});
if (isActionRun(envelope)) console.log(envelope.value); npm install -g @w6w/cli w6w run conn_YOUR_CONNECTION_ID --action lists-finalize --payload '{"id":"<value>","spendCredits":"<value>"}' Give an AI agent Wappalyzer — without giving it Wappalyzer's credentials. One MCP endpoint exposes every app, function and workflow the caller is entitled to, as tools it can discover and run. Access is granted per team while we onboard.
One tool call{
"name": "w6w_invoke",
"arguments": {
"ref": "app:io.w6w.wappalyzer#lists-finalize",
"input": {
"id": "<id>",
"spendCredits": "<spendCredits>"
}
}
}
Every tool names its target with a single ref. The
app: form above doesn't name a connection at all — the
host resolves which of the caller's Wappalyzer connections to sign
with, and refuses rather than guesses when the answer is ambiguous.
The token is attached host-side, at the moment of the call. It is never a tool argument, never in the model's context, and never in a transcript — so a prompt injection has nothing to exfiltrate.
Tools are derived per end user from what that person has actually connected and is entitled to — not one shared bot identity carrying the union of everyone's access.
Multi-step work runs on the workflow engine and returns a run handle the agent can poll — retries, branching and state survive the conversation that started them.
Wappalyzer's declared health checks are on the surface too, so an agent can tell "the vendor is down" from "your credential expired" before it burns a retry on either.
The MCP surface is part of the hosted platform. Wappalyzer itself is MIT, and the runtime that executes it is source-available (FSL).
Wappalyzer declares its own checks, so its health is a property of the app rather than something the host guesses at.
Remaining credit balance, read from the free GET /v2/credits/balance/ endpoint — no vendor-stated ceiling exists, so only the remaining count is reported.