diff --git a/src/models/prediction.ts b/src/models/prediction.ts
index 50cad46..dfd2b07 100644
--- a/src/models/prediction.ts
+++ b/src/models/prediction.ts
@@ -2,7 +2,10 @@ import mongoose from 'mongoose';
 
 
 const PredictionSchema = new mongoose.Schema({
-	name: String,
+	name: {
+		type: String,
+		unique: true
+	},
 	value: Number
 });
 
diff --git a/src/routes/prediction.ts b/src/routes/prediction.ts
index c45db7c..fc50d04 100644
--- a/src/routes/prediction.ts
+++ b/src/routes/prediction.ts
@@ -16,5 +16,11 @@ router.post('/prediction/new', (req, res, next) => {
 	});
 });
 
+router.post('/prediction/compare', async (req, res, next) => {
+	const valA = (await PredictionModel.findOne({ name: req.body.nameA })).value;
+	const valB = (await PredictionModel.findOne({ name: req.body.nameB })).value;
+	res.json(valB - valA);
+});
+
 
 module.exports = router;