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

# Minimum order sizes

> This section details the minimum order sizes for all supported currencies on the Rio platform.

Minimums on Rio are always in the currency you are receiving. For a buy order, the minimum is in the crypto you are purchasing; for a sell order, it is in the fiat currency you’re selling your crypto for.

| Currency                | Crypto / Fiat code API     | Minimum order size     |
| :---------------------- | :------------------------- | :--------------------- |
| USDC (Ethereum)         | USDC                       | \$1.00 USDC (Ethereum) |
| USDC (Polygon)          | USDC\_POLYGON\_NXTB        | \$1.00 USDC (Polygon)  |
| USDC (Solana)           | SOL\_USDC\_PTHX            | \$1.00 USDC (Solana)   |
| USDC (Stellar)          | XLM\_USDC\_5F3T            | \$1.00 USDC (Stellar)  |
| USDC (Base)             | USDC\_BASECHAIN\_ETH\_5I5C | \$1.00 USDC (Base)     |
| USDT (Ethereum)         | USDT\_ERC20                | \$1.00 USDT (Ethereum) |
| USDT (Polygon)          | USDT\_POLYGON              | \$1.00 USDT (Polygon)  |
| USDT (Tron)             | TRX\_USDT\_S2UZ            | \$1.00 USDT (Tron)     |
| USDT (BSC)              | USDT\_BSC                  | \$1.00 USDT (BSC)      |
| Mexican Peso            | MXN                        | \$20.00 MXN            |
| Peruvian Sol            | PEN                        | \$4.00 PEN             |
| Colombian Peso          | COP                        | \$6,000.00 COP         |
| US Dollar (any country) | USD                        | \$10.00 USD            |

<Note>
  **Disclaimer**: All technical documentation is subject to the terms and
  conditions, which apply supplementarily and take precedence over the
  documentation.
</Note>