Authentication — Zero Setup

Nucleus is a public API. No API keys, no tokens, no OAuth, no sign-up.

curl "https://apiw.proxynex.pro/fuel?fuel=diesel&city=mumbai"

What you get

Feature	Value
Authentication	❌ None required
CORS	Access-Control-Allow-Origin: *
Transport	HTTPS only
Rate limits	Generous (see Rate limits)

CORS

All responses include CORS headers, so you can call Nucleus directly from browser JavaScript:

const res = await fetch("https://apiw.proxynex.pro/crypto?coin=bitcoin");
const data = await res.json();
console.log(data.data.bitcoin.inr);