diff --git a/jsr.json b/jsr.json
index c25079c..a75650a 100644
--- a/jsr.json
+++ b/jsr.json
@@ -1,6 +1,6 @@
 {
   "name": "@nostr/tools",
-  "version": "2.24.2",
+  "version": "2.24.3",
   "exports": {
     ".": "./index.ts",
     "./core": "./core.ts",
diff --git a/nipad.ts b/nipad.ts
new file mode 100644
index 0000000..fdacf9c
--- /dev/null
+++ b/nipad.ts
@@ -0,0 +1,47 @@
+import { Filter } from './filter.ts'
+
+export type WebAddressPointer = {
+  filter: Filter
+  relays?: string[]
+}
+
+/**
+ * NIP-AD regex. Matches a web URL with a path that may have a Nostr counterpart.
+ *
+ * - 0: full match
+ * - 1: domain
+ * - 2: path
+ */
+export const AD_REGEX = /^(?:https?:\/\/)?((?:[\w-]+\.)+[\w-]+)(\/[^\s]*)?$/
+export const isWebAddress = (value?: string | null): value is string => AD_REGEX.test(value || '')
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+let _fetch: any
+
+try {
+  _fetch = fetch
+} catch (_) {
+  null
+}
+
+export function useFetchImplementation(fetchImplementation: unknown) {
+  _fetch = fetchImplementation
+}
+
+export async function queryWebAddress(url: string): Promise<WebAddressPointer | null> {
+  const match = url.match(AD_REGEX)
+  if (!match) return null
+
+  const [, domain, path = '/'] = match
+
+  try {
+    const res = await _fetch(`https://${domain}/.well-known/nostr.json?path=${path}`)
+    if (res.status !== 200) {
+      throw Error('Wrong response code')
+    }
+    const json = await res.json()
+    return json[path] || null
+  } catch (_) {
+    return null
+  }
+}
diff --git a/package.json b/package.json
index cf5add1..3afe344 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "type": "module",
   "name": "nostr-tools",
-  "version": "2.24.2",
+  "version": "2.24.3",
   "description": "Tools for making a Nostr client.",
   "repository": {
     "type": "git",
@@ -258,6 +258,12 @@
       "require": "./lib/cjs/nip98.js",
       "types": "./lib/types/nip98.d.ts"
     },
+    "./nipad": {
+      "source": "./nipad.ts",
+      "import": "./lib/esm/nipad.js",
+      "require": "./lib/cjs/nipad.js",
+      "types": "./lib/types/nipad.d.ts"
+    },
     "./nip99": {
       "source": "./nip99.ts",
       "import": "./lib/esm/nip99.js",