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

# Supported Rails and Currencies

> Stablecoin and blockchain network pairs, fiat rails and currencies, and the supported combinations for on-ramp (Payin) and off-ramp (Payout) transfers.

Fin.com routes stablecoin transfers across multiple blockchain networks and settles fiat through a range of payment rails. A transfer is only valid when the token and network you specify form a supported pair, and when the rail you use supports that pair in the direction you need.

## Stablecoins by network

| Stablecoins | Ethereum | Polygon | Solana | Base |
| :- | :- | :- | - | - |
| **USDC** | ✅ | ✅ | ✅ | ✅ |
| **USDT** | ✅ | ✅ | ✅ | ✅ |

## Fiat currencies and rails

| Rail | Currency | Coverage | Payin | Payout |
| :- | :- | :- | :- | :- |
| ACH | USD | US Domestic | ✅ | Coming soon |
| Fedwire | USD | US Domestic | ✅ | ✅ |
| SWIFT | USD | International | ✅ | ✅ |
| SPEI | MXN | MX Domestic | ✅ | ✅ |
| Local | BDT | BD Domestic | | ✅ |
| Local | PKR | PK Domestic | | ✅ |

## Supported combinations

### Payin: fiat to crypto

| Rail | Currency | USDC | USDT |
| :- | :- | :- | :- |
| ACH | USD | Ethereum, Polygon, Solana, Base | Ethereum, Polygon, Solana, Base |
| Fedwire | USD | Ethereum, Polygon, Solana, Base | Ethereum, Polygon, Solana, Base |
| SWIFT | USD | Ethereum, Polygon, Solana, Base | Ethereum, Polygon, Solana, Base |
| SPEI | MXN | Solana, Polygon | Polygon |

### Payout: crypto to fiat

| Rail | Currency | USDC | USDT |
| :- | :- | :- | :- |
| ACH (Coming soon) | USD | - | - |
| Fedwire | USD | Ethereum, Polygon, Solana, Base | Ethereum, Polygon, Solana, Base |
| SWIFT | USD | Ethereum, Polygon, Solana, Base | Ethereum, Polygon, Solana, Base |
| SPEI | MXN | Solana, Polygon | Polygon |
| Local | BDT | Ethereum, Polygon | Ethereum, Polygon |
| Local | PKR | Ethereum, Polygon | Ethereum, Polygon |

<Note>
  **Notes on the combination tables**

  * **Local**: Payouts only. Minimums and settlement times vary by destination country.
  * For the **Local payout** rails listed above, we route each transfer to the most efficient rail available. The rail varies based on the destination bank.
</Note>

## Direction

Every token and network pair in the network matrix supports both directions:

* Fiat to crypto (Payin)
* Crypto to fiat (Payout)

Confirm the rail in the combination tables before building against a pair.

## Conversion rate

Fin.com applies a fixed **1:1 conversion rate** for **USDC/USDT-to-USD** or **EURC-to-EUR** transactions. For all other assets, conversion rates are variable and subject to real-time market fluctuations.

## Requesting additional coverage

For integration requirements involving tokens, networks, or rails not listed above, reach out to your account manager or contact our team in your dedicated Slack channel.


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