> ## 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     |
| :---------- | :---------- | :---------- |
| **USDC**    | ✅           | ✅           |
| **USDT**    | Coming soon | Coming soon |

## 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 (Coming soon) |
| :------ | :------- | :---------------- | :----------------- |
| ACH     | USD      | Ethereum, Polygon | Ethereum, Polygon  |
| Fedwire | USD      | Ethereum, Polygon | Ethereum, Polygon  |
| SWIFT   | USD      | Ethereum, Polygon | Ethereum, Polygon  |
| SPEI    | MXN      | Solana, Polygon   | Polygon            |

### Payout: crypto to fiat

| Rail              | Currency | USDC              | USDT (Coming soon) |
| :---------------- | :------- | :---------------- | :----------------- |
| ACH (Coming soon) | USD      | Ethereum, Polygon | Ethereum, Polygon  |
| Fedwire           | USD      | Ethereum, Polygon | Ethereum, Polygon  |
| SWIFT             | USD      | Ethereum, Polygon | Ethereum, Polygon  |
| 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.

## 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.