Server expect process env variable PORT or if unpresent it will run on 3000 port by default
There is available only one single endpoint /api/metalCosts
It can be tested in any browser
fetch('http://localhost:3000/api/metalCosts').then(res=>res.json()).then(console.log)And also I deployed 1 instance on heroku (it free and will disable if too much queries will be sent) You can check it by
fetch('https://metals-service.onrender.com/api/metalCosts').then(res=>res.json()).then(console.log)