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

# Transaction Fees

> Learn how transaction fees work in Squads APIs and how to configure them

## Overview

Every transaction on the Solana blockchain requires a small network fee, similar to credit card processing fees but much smaller.

**Fee configuration is a required parameter for all transaction requests** in the Squads API - transactions will fail if fee configuration is not provided. On Squads APIs, you can:

* Pay fees in USDC, USDT, or SOL
* View exact fee amounts before confirming
* Configure which signer pays the fees or pay the fees from the Smart Account

## Fee Configuration

Fee configuration must be included in every transaction request. Here's how to specify it:

### USDC

The simplest way to pay fees. Most customers use USDC.

```json theme={null}
{
  "fee_config": {
    "currency": "usdc",
    "payer_address": "5iWt8..."
  }
  // ... other request parameters ...
}
```

### SOL

Solana's native currency.

```json theme={null}
{
  "fee_config": {
    "currency": "sol",
    "payer_address": "5iWt8..."
  }
  // ... other request parameters ...
}
```

## Fee Response

After processing a transaction request, you'll receive detailed fee information:

```json theme={null}
{
  "fee": {
    "amount": "1000000", // Base unit amount (e.g., USDC with 6 decimals)
    "amount_decimal": "1.0", // Human-readable amount
    "currency": "usdc", // The currency used for the fee
    "sol_equivalent": {
      "amount": "5000", // Amount in lamports (SOL's smallest unit)
      "amount_decimal": "0.000005" // Human-readable SOL amount
    }
  }
}
```

## Technical Details

For developers who need them, here are the full currency specifications:

### USDC

* **Currency Code:** usdc
* **Mint Address:** `EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v`
* **Decimals:** 6

### USDT

* **Currency Code:** usdt
* **Mint Address:** `Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB`
* **Decimals:** 6

### SOL

* **Currency Code:** sol
* **Mint Addresses:**
  * `11111111111111111111111111111111`
  * `So11111111111111111111111111111111111111112`
* **Decimals:** 9

## Common Questions

### Can I sponsor fees for users?

Yes, you can sponsor fees for users by setting the `payer_address` in the `fee_config` to your address.

### Which currency should I use?

Most customers use USDC for simplicity. However, both SOL and USDC options are fully supported and you can choose based on your needs.