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

# Corridors

> Available currency corridors and supported stablecoins on Ratio

Ratio launches with three APAC corridors covering high-volume cross-border payment routes in Southeast Asia. The architecture is corridor-agnostic — new currency pairs can be added by onboarding the relevant stablecoins, configuring oracle sources, and establishing on/off-ramp partnerships.

## Phase 1 corridors

| Corridor      | Direction         | Stablecoins  | Status |
| ------------- | ----------------- | ------------ | ------ |
| **USD ↔ IDR** | G10 → Asia EM     | USDT ↔ IDRX  | Live   |
| **USD ↔ SGD** | G10 → G10         | USDT ↔ tnSGD | Live   |
| **MYR ↔ IDR** | Asia EM → Asia EM | MYRC ↔ IDRX  | Live   |

<Tabs>
  <Tab title="USD ↔ IDR">
    The primary remittance corridor. Captures the largest cross-border flow volume in Indonesia, driven by worker remittances and e-commerce payouts. Indonesia has more crypto users than stock traders, making stablecoin rails a natural fit for this corridor.
  </Tab>

  <Tab title="USD ↔ SGD">
    The deepest and most liquid corridor. Singapore is a G10-equivalent market with tight institutional FX spreads, mature payment infrastructure, and clear regulatory guidance from MAS.
  </Tab>

  <Tab title="MYR ↔ IDR">
    A cross-emerging-market corridor connecting Malaysia and Indonesia. The swap executes directly between MYRC and IDRX. When a native MYR/IDR oracle feed is unavailable, the system derives the rate from USD/IDR and USD/MYR feeds — USD is used only as a pricing reference, not as an actual conversion step.
  </Tab>
</Tabs>

## Supported stablecoins

| Token     | Currency                | Description                                                     |
| --------- | ----------------------- | --------------------------------------------------------------- |
| **USDT**  | US Dollar (USD)         | Global reference stablecoin with the deepest on-chain liquidity |
| **IDRX**  | Indonesian Rupiah (IDR) | Regulated IDR stablecoin; anchor for the Indonesia corridor     |
| **tnSGD** | Singapore Dollar (SGD)  | SGD stablecoin for the Singapore corridor                       |
| **MYRC**  | Malaysian Ringgit (MYR) | MYR stablecoin serving both USD-MYR and MYR-IDR corridors       |

<Note>
  Ratio's pools are single-sided and per-currency — each stablecoin has its own dedicated liquidity pool. This ensures that liquidity for one corridor does not interfere with another.
</Note>

## Pricing

Ratio uses oracle-based pricing from institutional-grade feeds (Pyth Network), delivering near real-world FX rates. The pricing model mirrors how institutional FX desks operate — using real market data and controlled spreads rather than AMM bonding curves.

| Characteristic         | Detail                                                                          |
| ---------------------- | ------------------------------------------------------------------------------- |
| **No AMM slippage**    | Execution quality does not degrade with transaction size                        |
| **Volume-tiered fees** | Larger transactions receive better rates; each corridor has multiple size tiers |
| **Dynamic spread**     | Spreads adjust automatically based on market conditions to protect liquidity    |
| **Transparent**        | All fee components are visible and configurable; no hidden markups              |

For detailed fee schedules and tier structures, see the [Fee Structure](/features/fee-and-revenue) page.

## Future corridors

<img src="https://mintcdn.com/ratiolabs/_WZ1jJo-JiN7xW7b/images/apac-corridor-map.svg?fit=max&auto=format&n=_WZ1jJo-JiN7xW7b&q=85&s=2cb2b315a4c9691d32d7b9f134845389" alt="APAC Corridor Map" width="740" height="380" data-path="images/apac-corridor-map.svg" />

Ratio's architecture supports any fiat-backed stablecoin. Planned expansion includes corridors for:

| Currency | Region           | Status        |
| -------- | ---------------- | ------------- |
| **JPY**  | Japan            | Confirmed     |
| **KRW**  | South Korea      | Confirmed     |
| **CNH**  | China (offshore) | In discussion |
| **PHP**  | Philippines      | In discussion |
| **THB**  | Thailand         | In discussion |

<Info>
  Adding a new corridor requires no protocol changes — only configuration of oracle feeds, pool parameters, and partner integrations.
</Info>