diff --git a/src/js/components/info-links.js b/src/js/components/info-links.js
index 330d55ac..93af98da 100644
--- a/src/js/components/info-links.js
+++ b/src/js/components/info-links.js
@@ -11,6 +11,8 @@ module.exports = {
 			' — ',
 			m('a[href=/about]', {oncreate: m.route.link}, 'About'),
 			' — ',
+			m('a[href=/specdb-query]', {oncreate: m.route.link}, 'API'),
+			' — ',
 			m('a', { href: 'https://github.com/markasoftware/SpecDB', target: '_blank', rel: 'noopener' }, 'GitHub'),
 		]),
 };
diff --git a/src/js/entry.js b/src/js/entry.js
index dd02e36c..b2e4cfba 100644
--- a/src/js/entry.js
+++ b/src/js/entry.js
@@ -5,8 +5,9 @@ hash.redirectHashBangs();
 
 m.route.prefix(location.protocol === 'file:' ? '#!' : '');
 m.route(document.getElementById('spec-viewer'), '/', {
-	'/about': require('./about'),
-	'/:parts...': require('./spec-viewer'),
+		'/about': require('./about'),
+		'/specdb-query': require('./specdb_query'),
+		'/:parts...': require('./spec-viewer'),
 });
 m.mount(document.getElementById('part-selector'), require('./part-selector'));
 
diff --git a/src/js/specdb_query.js b/src/js/specdb_query.js
new file mode 100644
index 00000000..dcfb8991
--- /dev/null
+++ b/src/js/specdb_query.js
@@ -0,0 +1,48 @@
+const m = require('mithril');
+
+module.exports = {
+  oncreate: () =>
+    require('./seo').innerUpdate({
+      title: 'SpecDB — API: specdb-query',
+      description: 'Documentation for the SpecDB Query service (api.specdb.info): JSON and Protobuf endpoints, quickstart, and configuration.',
+    }),
+  view: () => m('#about-wrapper', [
+    m('h1', 'SpecDB Query (api.specdb.info)'),
+    m('p', 'SpecDB Query exposes a searchable database of CPU, GPU, and APU specifications. It provides both JSON and Protobuf endpoints for fast programmatic access.'),
+
+    m('h2', 'JSON Endpoints'),
+    m('ul', [
+      m('li', m('code', 'GET /v1/search/{query}'), ' — Search specs (JSON).'),
+      m('li', m('code', 'GET /v1/spec/{name}'), ' — Full spec for a named component (JSON).'),
+    ]),
+
+    m('h2', 'Protobuf Endpoints'),
+    m('ul', [
+      m('li', m('code', 'GET /v1/protobuf/search/{query}'), ' — Protobuf search response.'),
+      m('li', m('code', 'GET /v1/protobuf/search_full_specs/{query}'), ' — Full specs in Protobuf.'),
+      m('li', m('code', 'GET /v1/protobuf/cpu/{query}'), ' — CPU Protobuf resource.'),
+      m('li', m('code', 'GET /v1/protobuf/graphics_card/{query}'), ' — Graphics card Protobuf resource.'),
+      m('li', m('code', 'GET /v1/protobuf/apu/{query}'), ' — APU Protobuf resource.'),
+    ]),
+
+    m('h2', 'Extras (local use)'),
+    m('p', 'The service also supports transient "extras" endpoints for importing/exporting per-spec additional data. These are disabled on the public API and intended for local use only.'),
+
+    m('h2', 'Quickstart — Build & Run (Rust)'),
+    m('p', 'Prerequisites: Rust toolchain. The server reads a `config.yaml` from the OS project config directory.'),
+    m('pre', 'cargo build\ncargo run --release'),
+    m('p', 'Example search:'),
+    m('pre', 'curl "http://localhost:8082/v1/search/ryzen"'),
+
+    m('h2', 'Configuration'),
+    m('p', '`config.yaml` must contain at least `spec_db_path`. Optional: `allow_extras: true` to enable extras endpoints.'),
+
+    m('h2', 'Protobufs'),
+    m('p', 'Protobuf definitions are included with the project. Use `protoc` to generate bindings for your language; client requests should set `Accept: application/x-protobuf` when using Protobuf endpoints.'),
+
+    m('p', [ m('a[href=https://api.specdb.info]','Visit api.specdb.info'), ' — public service (read-only).' ]),
+    m('p', [ m('a[href=https://github.com/Sam-Mear/specdb-query]','GitHub repository'), ' — source code and documentation.' ]),
+
+    m('a[href=/]', {oncreate: m.route.link}, 'Back to SpecDB Home'),
+  ]),
+}