diff --git a/lib/use-hash-param.js b/lib/use-hash-param.js
new file mode 100644
index 0000000..013cc52
--- /dev/null
+++ b/lib/use-hash-param.js
@@ -0,0 +1,45 @@
+import { useState, useEffect, useMemo } from 'haunted';
+
+const hashUrl = () =>
+		new URL(
+			location.hash.replace(/^#!?/iu, '').replace('%23', '#'),
+			location.origin
+		),
+	parameterize = (hashParam) =>
+		hashParam
+			? () =>
+					new URLSearchParams(hashUrl().hash.replace('#', '')).get(hashParam)
+			: undefined;
+
+export const link = (hashParam, value) => {
+		if (!hashParam) {
+			return;
+		}
+		const url = hashUrl(),
+			sp = new URLSearchParams(url.hash.replace('#', ''));
+		sp.set(hashParam, value);
+		return (
+			'#!' + Object.assign(url, { hash: sp }).href.replace(location.origin, '')
+		);
+	},
+	useHashParam = (hashParam) => {
+		const parameterized = useMemo(() => parameterize(hashParam), [hashParam]),
+			[param, setParam] = useState(parameterized);
+
+		useEffect(() => {
+			if (parameterized == null) {
+				return;
+			}
+			const readParam = () =>
+				requestAnimationFrame(() => setParam(parameterized));
+			readParam();
+			window.addEventListener('popstate', readParam);
+			window.addEventListener('hash-changed', readParam);
+			return () => {
+				window.removeEventListener('popstate', readParam);
+				window.removeEventListener('hash-changed', readParam);
+			};
+		}, [parameterized]);
+
+		return param;
+	};