{ truly (random); }

curl -d length=32 https://rdrand.com/API/GenerateKey
curl -d length=16 https://rdrand.com/API/GenerateBytes | base64 --decode > random.bin
curl -d "" https://rdrand.com/API/GenerateUInt

const res = await fetch("https://rdrand.com/API/GenerateKey", {
  method: "POST",
  body: new URLSearchParams({ length: 32 }),   // form data: no CORS preflight
});
const key = await res.text();                  // 32 chars from 0-9 A-Z _ a-z

// jQuery
$.post("https://rdrand.com/API/GenerateBytes", { length: 16 }, (base64) => { /* ... */ });
$.post("https://rdrand.com/API/GenerateUInt", (n) => { /* 0 to 2147483647 */ });

import base64
import requests

API = "https://rdrand.com/API/"
key = requests.post(API + "GenerateKey", data={"length": 32}).text
raw = base64.b64decode(requests.post(API + "GenerateBytes", data={"length": 16}).text)
n = int(requests.post(API + "GenerateUInt").text)

// npm install https://rdrand.com/Downloads/jebtek-rdrand-2.0.0.tgz
const { RdRand } = require("@jebtek/rdrand");

const rng = new RdRand();                  // CPU's RDRAND/RNDR, else the API
const key = await rng.generateKey(32);
const bytes = await rng.generateBytes(16); // Buffer
const n = await rng.generateUInt();
console.log(rng.source);                   // "rdrand", "rndr" or "service"

// implementation(files("libs/rdrand-kotlin-2.0.0.jar"))
import com.jebtek.rdrand.RdRand

val rng = RdRand()                         // CPU's RDRAND/RNDR, else the API
val key = rng.generateKey(32)
val bytes = rng.generateBytes(16)
val n = rng.generateUInt()
println(rng.source)                        // RDRAND, RNDR or SERVICE

// rdrand-client = { path = "rdrand-client-2.0.0" }
use rdrand_client::Client;

let rng = Client::new();                   // CPU's RDRAND/RNDR, else the API
let key = rng.generate_key(32)?;
let bytes = rng.generate_bytes(16)?;
let n = rng.generate_uint()?;
println!("{}", rng.source().as_str());     // "rdrand", "rndr" or "service"

// dotnet add package JebteK.RdRand --source <folder with the .nupkg>
using JebteK.RdRand;

using var rng = new RdRandClient();        // CPU's RDRAND/RNDR, else the API
string key = await rng.GenerateKeyAsync(32);
byte[] bytes = await rng.GenerateBytesAsync(16);
uint n = await rng.GenerateUIntAsync();
Console.WriteLine(rng.Source);             // Rdrand, Rndr or Service

// RdRandom-v1_1.zip: .NET Framework, requires RestSharp, API only
string key = RdRandom.Randomizer.GenerateKey(32);
byte[] bytes = RdRandom.Randomizer.GenerateBytes(16);
uint n = RdRandom.Randomizer.GenerateUInt();