# BlankFX

> Stablecoin FX infrastructure for businesses that need fast settlement, tight pricing, and a clean audit trail.

BlankFX is a stablecoin FX layer for business flows. It combines routing, pricing, compliance controls, and liquidity into one settlement system.

## Key concepts

- Oracle-anchored pricing: Swap rates are derived from on-chain oracle feeds, not AMM pool ratios.
- Gasless swaps: Users sign an off-chain message. A relay service submits the transaction and pays gas.
- Single-sided liquidity: Deposit one stablecoin to earn yield. No token pairing required.
- USD Hub model: USD stablecoins can share liquidity while cross-currency swaps route through the relevant pools.

## Architecture

- BlankFXRouterV3: Entry point for all swaps. Routes to the correct pool based on token pair.
- BlankFXUSDHub: Holds USD stablecoin liquidity (USDC, USDT, RLUSD).
- BlankFXFXPool: Foreign currency pools (e.g. EUR). Each currency gets its own pool.
- BlankFXAccess: Tiered permission system. Users must be registered to trade.

## Swap types

- USD-USD: Direct swap within the USD Hub (e.g. USDC to USDT). Near 1:1 rate.
- Cross-currency: Routes through USD Hub and foreign pool via oracle rate (e.g. USDC to EURC).
- Intra-pool: Swap between tokens in the same foreign pool.

## Earning yield

Deposit stablecoins into a pool to receive receipt tokens (e.g. `bUSDx`). Trading fees accrue to the pool, increasing the exchange rate between receipt tokens and the underlying stablecoin. No claiming required.

## Current status

Live on Ethereum Sepolia (testnet). Mainnet and additional network deployments are planned.

## Machine-readable reference

- Token list: /reference/tokens.json
- Contract addresses: /reference/contracts.json

## Documentation

- Getting started: /getting-started
- Swaps: /swaps
- Earn: /earn
- Fees: /fees
- Contracts: /contracts
- FAQ: /faq
- Compliance & KYC: /compliance
- Stablecoin Listing Requirements: /listing-requirements
- Broker & Market-Maker Onboarding: /broker-mm-onboarding