> ## Documentation Index
> Fetch the complete documentation index at: https://api-docs.sw4p.io/llms.txt
> Use this file to discover all available pages before exploring further.

# sw4p

> Gasless cross-chain transfers for stablecoins and native tokens

<img className="block dark:hidden rounded-xl" src="https://mintcdn.com/rendernetwork-0c7a6ca5/EitjxuFRnzWskehB/images/hero-light.png?fit=max&auto=format&n=EitjxuFRnzWskehB&q=85&s=3f92216853694d15d833b097593c9219" alt="sw4p Hero Light" width="1200" height="630" data-path="images/hero-light.png" />

<img className="hidden dark:block rounded-xl" src="https://mintcdn.com/rendernetwork-0c7a6ca5/EitjxuFRnzWskehB/images/hero-dark.png?fit=max&auto=format&n=EitjxuFRnzWskehB&q=85&s=4d563db0b6bb837fa4cd10203a748362" alt="sw4p Hero Dark" width="1200" height="630" data-path="images/hero-dark.png" />

## Welcome to sw4p

sw4p enables **gasless cross-chain transfers** across any blockchain. Users sign permits or transactions with their wallet, and sw4p handles all bridging infrastructure.

<CardGroup cols={2}>
  <Card title="Quick Start" icon="rocket" href="/quickstart">
    Get started in under 5 minutes
  </Card>

  <Card title="TypeScript SDK" icon="js" href="/sdks/typescript">
    npm install @sw4p/bridge
  </Card>

  <Card title="Rust SDK" icon="rust" href="/sdks/rust">
    cargo add sw4p-bridge
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference/introduction">
    REST API documentation
  </Card>
</CardGroup>

## Vision

**Support every blockchain, every stablecoin, and every native token.**

Current MVP supports:

* **EVM Chains**: Ethereum, Base, Arbitrum, Polygon
* **Non-EVM**: Solana
* **Tokens**: USDC (more coming soon)

## Key Features

<AccordionGroup>
  <Accordion title="Gasless Transfers" icon="gas-pump">
    Users don't need native tokens for gas. sw4p sponsors gas costs through permit-based approvals.
  </Accordion>

  <Accordion title="Non-Custodial" icon="lock">
    SDKs never handle private keys. All signing happens in the user's wallet.
  </Accordion>

  <Accordion title="Fast" icon="bolt">
    Transfers complete in approximately 60 seconds across all supported routes.
  </Accordion>

  <Accordion title="Transparent Fees" icon="receipt">
    Know the exact cost before confirming. Fee estimates include all gas and bridge costs.
  </Accordion>
</AccordionGroup>

## How It Works

```mermaid theme={null}
sequenceDiagram
    participant User
    participant SDK
    participant sw4p API
    participant Source Chain
    participant Destination Chain

    User->>SDK: Sign permit/transaction
    SDK->>sw4p API: POST /transfer
    sw4p API->>Source Chain: Execute burn
    Source Chain-->>sw4p API: Confirm
    sw4p API->>Destination Chain: Execute mint
    Destination Chain-->>User: Receive tokens
```