> ## Documentation Index
> Fetch the complete documentation index at: https://docs.b3.fun/llms.txt
> Use this file to discover all available pages before exploring further.

# Fiat onramp

> Let users pay with a credit card or bank transfer and execute onchain actions in one step

## What it does

Users pay with a card or bank transfer. AnySpend converts the fiat to crypto and executes the onchain transaction in a single flow. The user never has to buy crypto separately.

## How it works

1. **User starts an action** -- minting, staking, a contract call, whatever.
2. **Fiat payment** -- they pay with Stripe or Coinbase Pay.
3. **Conversion + execution** -- AnySpend converts fiat to the right token and executes the transaction.
4. **Delivery** -- tokens land in the user's wallet. Done.

## Payment providers

**Stripe**

* Credit/debit cards worldwide
* 3D Secure authentication
* Automatic currency conversion for non-USD
* Localized payment methods by region

**Coinbase Pay**

* Pay from Coinbase account balance or debit card
* Familiar UX for Coinbase users
* No additional AnySpend fees

New providers can be added through a modular architecture. Routing between providers is automatic based on the user's region.

## Fraud prevention

Each transaction goes through a real-time risk engine:

* **Allow** -- transaction proceeds
* **Verify** -- additional user verification required
* **Block** -- suspicious activity stopped

The engine checks behavioral signals, device fingerprints, and network intelligence.

## Regional support

* Automatic location detection
* Local payment methods and currencies
* Provider selection based on geography
* Regional compliance handled for you

## Fees

| Provider     | Fee                           |
| ------------ | ----------------------------- |
| Stripe       | 5.4% + \$0.30 per transaction |
| Coinbase Pay | No AnySpend fee               |

Users see a fee breakdown during checkout before they pay.

## Common use cases

* Mint NFTs with a credit card
* Stake or vote from fiat
* Onboard non-crypto users to games and dApps