> ## Documentation Index
> Fetch the complete documentation index at: https://docs.utexo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Quickstart Overview

> Choose your platform and send your first USDT on Bitcoin transfer in minutes.

The Utexo SDK is available across three platform targets, each sharing the same `@utexo/rgb-sdk-core` foundation. Choose the guide that matches your environment to get started.

<CardGroup cols={3}>
  <Card title="Node.js" icon="node-js" href="/getting-started/quickstart/node-js">
    Server-side applications and backend services. Uses `@utexo/rgb-sdk`.
  </Card>

  <Card title="React Native" icon="mobile" href="/getting-started/quickstart/react-native">
    iOS and Android mobile applications. Uses `@utexo/rgb-sdk-rn`.
  </Card>

  <Card title="Web" icon="browser" href="/getting-started/quickstart/web">
    Browser-based applications. Uses `@utexo/rgb-sdk-web`.
  </Card>
</CardGroup>

## How RGB Transfers Work

Before writing any code, it helps to understand the transfer flow. This applies to all platform guides.

1. The **receiver** generates a blinded invoice tied to one of their UTXOs.
2. The **sender** calls `.send()` with that invoice — the RGB state transition is constructed and broadcast.
3. Both wallets call `.refreshWallet()` to sync the latest on-chain state.
4. The receiver's balance updates to reflect the new asset allocation.

All asset state is validated client-side. Neither party needs to trust a third party — the Bitcoin UTXO provides the settlement anchor.

<Info>
  New to RGB or UTXOs? See the [Glossary](/getting-started/glossary) for definitions, and [Architecture](/getting-started/architecture) for how Bitcoin, Lightning, and RGB fit together.
</Info>

## Network Endpoints

All SDK platforms connect to the same underlying network infrastructure. No endpoint configuration is needed to follow any of the Quickstart guides — the defaults below are used automatically on testnet.

| Service         | Testnet Endpoint                               |
| --------------- | ---------------------------------------------- |
| RGB Transport   | `rpcs://rgb-proxy-testnet3.utexo.com/json-rpc` |
| Bitcoin Indexer | `ssl://electrum.iriswallet.com:50013`          |

For the full list of network identifiers and mainnet endpoints, see the [Utexo SDK Reference](/sdk/utexo-sdk#networks).

## Common Prerequisites

All platform guides share these requirements:

* **A testnet BTC balance** for transaction fees. Get testnet BTC from the Utexo Telegram faucet bot \[@Utexo\_RLN\_bot]\([https://t.me/Utexo\_RLN\_bot](https://t.me/Utexo_RLN_bot)) — send `/getbtc` followed by your Bitcoin address.

<Warning>
  All guides use **testnet**. Never use mainnet keys or real funds while following a Quickstart. Testnet assets have no monetary value.
</Warning>

## What You Will Have After Any Guide

* A working `UTEXOWallet` instance connected to testnet
* A funded wallet with UTXOs ready to receive RGB assets
* A completed and verified USDT on Bitcoin transfer

**Estimated time:** 15 minutes per guide, not counting testnet faucet confirmation time (usually 1–5 minutes, but can vary).

## SDK Package Summary

| Package              | Target                       | Install                          |
| -------------------- | ---------------------------- | -------------------------------- |
| `@utexo/rgb-sdk`     | Node.js (server)             | `npm install @utexo/rgb-sdk`     |
| `@utexo/rgb-sdk-rn`  | React Native (iOS & Android) | `npm install @utexo/rgb-sdk-rn`  |
| `@utexo/rgb-sdk-web` | Browser (Web)                | `npm install @utexo/rgb-sdk-web` |

All three packages expose the same `UTEXOWallet` class and method API. The differences are in installation, initialisation config, and storage model — each guide covers these specifics for its platform.