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

# Introduction

> Build with Zet — the smart on/off ramp and cross-chain infrastructure for businesses

# Welcome to Zet API

Zet provides a unified API for businesses to integrate **fiat on/off ramp**, **token swap**, and **cross-chain transfer** capabilities into their applications.

<CardGroup cols={2}>
  <Card title="Quickstart" icon="rocket" href="/quickstart">
    Get your API keys and make your first call in minutes.
  </Card>

  <Card title="API Reference" icon="code" href="/api-reference/overview">
    Explore all endpoints with request/response examples.
  </Card>

  <Card title="Guides" icon="book" href="/guides/onramp">
    Step-by-step integration guides for each product.
  </Card>

  <Card title="Supported Assets" icon="coins" href="/supported-assets">
    View all supported chains, tokens, and currencies.
  </Card>
</CardGroup>

## What you can build

| Use Case                                    | Zet Products             |
| ------------------------------------------- | ------------------------ |
| **Accept NGN payments, deliver crypto**     | On-Ramp API              |
| **Let users cash out crypto to their bank** | Off-Ramp API             |
| **In-app token exchange**                   | Swap API                 |
| **Multi-chain portfolio management**        | Cross-Chain Transfer API |
| **Custodial wallets for your users**        | Wallets API              |

## How it works

Zet abstracts the complexity of blockchain interactions behind a simple REST API:

<Steps>
  <Step title="Create a wallet">
    Create a Zet-managed smart wallet for each of your users — or bring your own wallet addresses.
  </Step>

  <Step title="Quote a transaction">
    Get a real-time price quote with all fees broken down transparently.
  </Step>

  <Step title="Execute">
    Initiate the transaction. For custodial wallets, Zet handles signing, gas, and execution automatically.
  </Step>

  <Step title="Get notified">
    Receive webhook events when the transaction completes (or fails).
  </Step>
</Steps>

## Key features

* **ERC-4337 Smart Accounts** — Every wallet is a smart contract account with gasless transactions sponsored by Zet.
* **Deterministic addresses** — The same wallet address works across all supported EVM chains. No separate deployment needed.
* **Multi-chain** — Primary support for Base and BSC, with cross-chain transfers to Ethereum, Polygon, Arbitrum, Avalanche, and Solana.
* **Optimized routing** — Swaps and bridges are routed through Zet's aggregation engine for the best rates across multiple DEXs and bridges.
* **Nigerian Naira (NGN) ramp** — Direct fiat on/off ramp with Nigerian bank transfers.
* **Transparent fees** — All fees are broken down in quotes before execution. No hidden charges.
* **Webhooks** — Real-time event notifications with HMAC-SHA256 signature verification.

## Base URL

```
https://api.zet.money/v1
```

## Support

Have questions or need help? Reach out:

* **Email**: [zetdotmoney@gmail.com](mailto:zetdotmoney@gmail.com)
* **Twitter/X**: [@zetdotmoney](https://x.com/zetdotmoney)