Setting Custom price while adding a product to cart

[sanjeevbelagali]

This is my code
magento.checkoutCartProduct.add({sessionId: sessionId, quoteId:req.params.id, products:product, storeView:1}, function(err, docs){
if(err) { res.json(err);
} else { res.json(docs);}
});

This is the way i am sending data.
"product_id": "1320",
"sku": "SJINPDCLDR0000012",
"name": "Bunting Studio Tea Set",
"qty": 1