> For the complete documentation index, see [llms.txt](https://docs.fonbnk.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.fonbnk.com/about.md).
# About
Welcome to the Fonbnk documentation.
Fonbnk moves money between local currency and crypto in [20 countries](/supported-countries-and-cryptocurrencies.md). A user pays with a bank transfer, mobile money, a digital wallet or airtime, and receives crypto — or the other way round. We find the counterparty, hold the rate, run KYC, and settle.
### Pick your integration
| | [Pay Widget](/widget-integration/getting-started.md) | [Server to server](/server-to-server/getting-started.md) |
| --------------- | ---------------------------------------------------- | -------------------------------------------------------------- |
| What it is | Our hosted checkout, opened at a URL you build | Our REST API, called from your backend |
| You build | A link or an iframe | The whole user journey |
| Who owns the UI | Fonbnk | You |
| KYC screens | Handled for you | You collect and submit the documents |
| Good for | Getting live in a day, or embedding a checkout | Full control of the experience, aggregators, automated payouts |
The two are not exclusive. A common shape is the API for pricing and the widget for the payment itself — create a quote server-side, then hand the `quoteId` to the widget so the price you advertised is the price the user gets.
### What you can build
* **On-ramp** — a user pays local currency, crypto lands in their wallet. [How it works](/how-it-works.md)
* **Off-ramp** — a user sends crypto, local currency lands in their bank or mobile money account.
* **Collections** — a user pays local currency and **your** USD merchant balance is credited.
* **Payouts** — you spend your USD balance to pay users in their local currency.
The five order shapes and how to call them are on [Flow examples](/server-to-server/integration-guide/flow-examples.md).
### Start here
1. Register on the [sandbox dashboard](https://sandbox-dashboard.fonbnk.com/login) and get your keys.
2. Read [How it works](/how-it-works.md) for the end-user journey.
3. Follow [Widget integration](/widget-integration/getting-started.md) or [Server to server](/server-to-server/getting-started.md).
{% hint style="info" %}
Everything works in sandbox with simulated money, including forced failures, underpayments and overpayments. Build there first — moving to production is a change of base URL and keys. See [Servers](/server-to-server/servers.md).
{% endhint %}
---
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