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

# Contracts

> Deployed contract addresses and verification status.

# Contracts

## Deployed contracts (Sepolia testnet)

| Contract                     | Address                                      | Purpose                                           |
| ---------------------------- | -------------------------------------------- | ------------------------------------------------- |
| BlankFXAccess                | `0xc3e9A233861a5f5E606aF61fEa5907a0776aA411` | Access control and user permissions               |
| BlankFXUSDHub                | `0xC081279f1B241f2530bde7bF46430A4e108C4FfF` | USD liquidity pool (USDC, USDT, RLUSD)            |
| BlankFXFXPool (EUR)          | `0xd73C964F0cEb9eA46973292383306c21bd53B23C` | EUR liquidity pool (EURC)                         |
| BlankFXRouterV3              | `0x171bB65D294ae2F9fC10e77A6AC35141baDd4bD9` | Swap router — routes trades through hub and pools |
| BlankFXRelayRouter (Gasless) | `0x0C092B9D0D4E34FCd64e518AE8F58ccfC9fD4Ed4` | Gasless relay router via Permit2                  |
| Permit2                      | `0x000000000022D473030F116dDEE9F6B43aC78BA3` | Uniswap Permit2 — used for gasless approvals      |

<Info>
  All contracts are deployed on **Sepolia testnet**. Mainnet deployment is pending audit completion.
</Info>

## Architecture

```
User Wallet
    │
    ▼
BlankFXRouterV3 (swap entry point)
    │           BlankFXRelayRouter (gasless path via Permit2)
    │
    ├── BlankFXUSDHub (USD stablecoin pool)
    │
    └── BlankFXFXPool (foreign currency pools, e.g. EUR)
    
BlankFXAccess (permission checks on every trade)
```

All swaps go through the Router. The Router checks access permissions, then routes the trade to the appropriate pool(s) based on the token pair.

For gasless swaps, users sign an off-chain Permit2 message and the BlankFXRelayRouter submits the transaction on their behalf.

## Access control

BlankFX uses a tiered access system. Users must be registered to trade. Access tiers determine maximum trade sizes and available features.

## Audit status

Contracts have not yet been formally audited. A third-party audit is planned before mainnet deployment.

<Warning>
  BlankFX is currently deployed on Sepolia testnet only. Do not send real funds to these addresses.
</Warning>