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

# Welcome to Bridge by LINK

> Let your customers swap fiat for stablecoins, and stablecoins back to fiat.

Bridge is an API that moves money between **fiat currencies** (such as Nigerian naira, Ghanaian cedi and more) and **stablecoins** (such as USDC, USDT).

You connect your app to Bridge once. After that, your customers can:

* **Buy stablecoins** with fiat. Known as **onramp**.
* **Sell stablecoins** for fiat paid to a bank account or mobile money wallet. Known as **offramp**.

You don't need to hold stablecoins, talk to banks, or manage liquidity. Bridge handles that, and tells you what is happening at every step.

## What you can build

> [card] [Onramp](https://docs.bridge.linkio.world/flows/onramp.md)
>
> A customer pays in fiat and receives USDC in their wallet.

> [card] [Offramp](https://docs.bridge.linkio.world/flows/offramp.md)
>
> A customer sends USDC and receives fiat in their bank or mobile money wallet.

## How to read these docs

The pages are in the order you'll need them. If you're new, read from top to bottom:

**1. Understand the journey**

[How it works](https://docs.bridge.linkio.world/how-it-works.md) explains the steps every payment goes through.

**2. Make your first payment**

The [Quickstart](https://docs.bridge.linkio.world/quickstart.md) takes you from zero to a test payment in a few minutes.

**3. Set up your account**

[Set up your account](https://docs.bridge.linkio.world/control-app/overview.md) shows you how to create API keys, allow your servers, and add webhooks in the Bridge app.

**4. Know the rules**

[Before you build](https://docs.bridge.linkio.world/before-you-build/currencies.md) lists the currencies, limits, time limits, and versions you need to know about.

**5. Build the full flow**

[Core flows](https://docs.bridge.linkio.world/flows/onboard-customer.md), [Webhooks](https://docs.bridge.linkio.world/webhooks/overview.md), and [Errors](https://docs.bridge.linkio.world/errors/overview.md) cover everything your integration needs to handle.

> [!TIP]
>
> Looking for a step-by-step example for a specific currency? See [Recipes](https://docs.bridge.linkio.world/recipes/overview.md).

## Two environments

Each environment has its own API and its own Bridge app.

| Environment | API base URL | Bridge app | Use it for |
| - | - | - | - |
| Sandbox | `https://sandbox.core.linkio.world/api` | [sandbox.bridge.linkio.world](https://sandbox.bridge.linkio.world) | Building and testing. No real money moves. |
| Live | `https://core.linkio.world/api` | [bridge.linkio.world](https://bridge.linkio.world) | Real payments with real money. |

Read [Sandbox and live](https://docs.bridge.linkio.world/sandbox.md) to learn how they differ.


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.