diff --git a/readme.md b/readme.md
index 5eed7d1..84ae1ec 100644
--- a/readme.md
+++ b/readme.md
@@ -1 +1,53 @@
-## Start Api: node src/index.js
+# YuGiOh Collection Manager — API
+
+Node.js/Express API for the YuGiOh collection manager. Handles card data, set browsing, image serving, and DB imports from YGOPRODeck.
+
+## Tech Stack
+
+- **Node.js** + **Express 5**
+- **MySQL2** (connection pool)
+- **Axios** — YGOPRODeck API requests + card image fetching
+
+## Endpoints
+
+| Method | Path | Description |
+|---|---|---|
+| GET | `/health` | Health check |
+| GET | `/exportCards` | All cards with printings and owned counts |
+| GET | `/cardImage/:cardId` | Card image (fetches + caches blob on first request) |
+| GET | `/sets` | All sets with owned card counts |
+| GET | `/sets/:setId/cards` | Cards in a specific set |
+| PUT | `/collection/amount` | Update owned count for a printing |
+| POST | `/import/full-import` | Full DB import from YGOPRODeck |
+| POST | `/import/sets` | Import sets only |
+| POST | `/import/cards` | Import cards only |
+| GET | `/db-version` | Current local DB version |
+
+## Development
+
+```bash
+npm install
+cp .env.example .env  # fill in DB credentials
+node src/index.js
+```
+
+## Deployment
+
+Built as a Docker image. CI/CD via Woodpecker on push to `main`.
+
+```bash
+docker build -t yugioh-api .
+docker run -d --name yugioh-api --network yugioh --env-file .env yugioh-api
+```
+
+## Environment
+
+| Variable | Description |
+|---|---|
+| `DB_HOST` | MySQL host |
+| `DB_PORT` | MySQL port (default 3306) |
+| `DB_USER` | MySQL user |
+| `DB_PASSWORD` | MySQL password |
+| `DB_NAME` | Database name |
+| `YGOPRO_API_BASE` | YGOPRODeck API base URL |
+| `PORT` | Server port (default 3000) |
diff --git a/src/controllers/setsController.js b/src/controllers/setsController.js
new file mode 100644
index 0000000..19bcd77
--- /dev/null
+++ b/src/controllers/setsController.js
@@ -0,0 +1,44 @@
+const db = require('../config/db');
+
+async function getSets(req, res) {
+  try {
+    const [rows] = await db.execute(`
+      SELECT
+        s.id, s.set_name, s.set_code, s.num_of_cards, s.tcg_date,
+        COUNT(DISTINCT csr.card_id) AS total_in_db,
+        COUNT(DISTINCT CASE WHEN csr.amount_owned > 0 THEN csr.card_id END) AS owned_count
+      FROM sets s
+      LEFT JOIN card_sets_rarity csr ON s.id = csr.set_id
+      GROUP BY s.id
+      ORDER BY s.tcg_date DESC, s.set_name ASC
+    `);
+    res.json(rows);
+  } catch (err) {
+    console.error('Error fetching sets:', err);
+    res.status(500).json({ error: 'Failed to fetch sets' });
+  }
+}
+
+async function getSetCards(req, res) {
+  const { setId } = req.params;
+  try {
+    const [rows] = await db.execute(`
+      SELECT
+        c.id, c.name, c.card_type AS type, c.frame_type,
+        csr.card_set_code AS set_code,
+        r.id AS rarity_id, r.rarity_name, r.rarity_code,
+        csr.amount_owned
+      FROM card_sets_rarity csr
+      JOIN cards c ON csr.card_id = c.id
+      JOIN rarities r ON csr.rarity_id = r.id
+      WHERE csr.set_id = ?
+      ORDER BY c.name ASC
+    `, [setId]);
+    res.json(rows);
+  } catch (err) {
+    console.error('Error fetching set cards:', err);
+    res.status(500).json({ error: 'Failed to fetch set cards' });
+  }
+}
+
+module.exports = { getSets, getSetCards };
diff --git a/src/index.js b/src/index.js
index 378291a..ab4759f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -7,6 +7,7 @@ const collectionRoutes = require('./routes/collectionRoutes');
 const exportCardsRoutes = require('./routes/exportCardsRoutes');
 const cardImageRoutes = require('./routes/cardImageRoutes');
 const versionRoutes = require('./routes/versionRoutes');
+const setsRoutes = require('./routes/setsRoutes');
 
 const app = express();
 app.use(cors());
@@ -19,6 +20,7 @@ app.use('/collection', collectionRoutes);
 app.use('/exportCards', exportCardsRoutes);
 app.use('/cardImage', cardImageRoutes);
 app.use('/db-version', versionRoutes);
+app.use('/sets', setsRoutes);
 
 const PORT = process.env.PORT || 3000;
 app.listen(PORT, () => {
diff --git a/src/routes/setsRoutes.js b/src/routes/setsRoutes.js
new file mode 100644
index 0000000..7a84951
--- /dev/null
+++ b/src/routes/setsRoutes.js
@@ -0,0 +1,8 @@
+const express = require('express');
+const router = express.Router();
+const { getSets, getSetCards } = require('../controllers/setsController');
+
+router.get('/', getSets);
+router.get('/:setId/cards', getSetCards);
+
+module.exports = router;