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

# Fund a Card

> Load USD from your business wallet onto a virtual card

Move USD from your PayVessel **business USD wallet** onto a customer’s virtual card. Funding fees apply; PayVessel holds the spendable card balance.

## How it works

1. **Confirm wallet balance** can cover amount + funding fee ([Card Fee Quote](/virtual-cards/fee-quote)).
2. **POST the fund amount** with the target `card_id`.
3. **Card balance updates** on the card object; use [Get a Card](/virtual-cards/get-card) to read the current balance.

## When to use

* Top up a card after the initial prefund
* Replenish spend limits for recurring customers
* Move float from your business wallet to card programs

<Card title="API Reference" icon="code" href="/api-reference/virtual-cards/fund-card">
  Full request/response details and Try it
</Card>