# Paying with USDC

All purchases on Blocksmiths are made in USDC. You will need USDC in your wallet on the chain you want to pay with before checking out.

## Before You Pay

Make sure you have:

* A compatible wallet connected (RainbowKit for EVM chains, Phantom for Solana)
* Enough USDC on the chain you selected
* Enough native gas token to cover the transaction fee (ETH on Ethereum/Base, MATIC on Polygon, SOL on Solana)

## Choosing a Chain

At checkout, select which chain to pay on. Choose based on whichever has the lowest fees or where you already hold USDC.

| Chain    | Typical Fee | Speed        |
| -------- | ----------- | ------------ |
| Ethereum | Higher      | \~15 seconds |
| Base     | Very low    | \~2 seconds  |
| Polygon  | Very low    | \~2 seconds  |
| Solana   | Very low    | \~1 second   |

## Approving the Transaction

When you click **Pay**, your wallet opens a confirmation prompt showing:

* The recipient address (the platform contract)
* The USDC amount
* The estimated gas fee

Confirm the transaction in your wallet. Do not close the page while it is pending.

## Transaction Fails or Gets Stuck

If your transaction fails:

* Check that you have enough gas on the selected chain
* Check that your USDC balance covers the full order total
* Try again — failed transactions do not charge you (only gas may be consumed)

If a transaction went through on-chain but your order was not updated, contact support and provide the transaction hash.


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