---
title: "Fund cards"
---
You can fund customers' cards from either internal accounts or wallets using the [Transfer](/api-reference/transfer/post-v1-transfer) endpoint.

## Fund from an internal account

To fund a card from an internal account, include the source account id, destination card id, and customer id in your request.

The source object contains the funding account details, and the destination object contains the card details:

```bash title="fund from an internal account request"
curl --request POST \
     --url https://api.gravv.xyz/v1/transfer \
     --header 'Api-Key: <API_KEY>' \
     --header 'Idempotency-Key: 979879887678789_attempt_1' \
     --header 'content-type: application/json' \
     --data '
{
  "source": {
    "source_type": "internal_account",
    "id": "b9c2cb0d-e09a-496f-8655-d8c4b7aaf2f8"
  },
  "destination": {
    "destination_type": "card",
    "id": "3397bab8-0f2b-4721-b15b-8c71860f01f9"
  },
  "amount": 6,
  "description": "Testing Card Funding",
  "customer_id": "bb6c6022-f1d8-492f-80f0-7547134bb42f",
  "client_reference": "card_funding_001"
}
'
```

## Fund from a wallet

To fund a card from a wallet, use the Transfer endpoint with `internal_crypto_wallet` as the source type. Include the wallet id, crypto asset type, destination card id, and customer id in your request.

The source object contains the funding account details, and the destination object contains the card details:

```bash title="fund from a wallet request"
curl --request POST \
     --url https://api.gravv.xyz/v1/transfer \
     --header 'Api-Key: <API_KEY>' \
     --header 'Idempotency-Key: 979879887678789_attempt_1' \
     --header 'content-type: application/json' \
     --data '
{
  "source": {
    "source_type": "internal_crypto_wallet",
    "id": "67e169c0-547f-410d-8e18-f616b6822d70",
    "crypto_asset": "USDC"
  },
  "destination": {
    "destination_type": "card",
    "id": "3397bab8-0f2b-4721-b15b-8c71860f01f9"
  },
  "amount": 6,
  "description": "Testing Card Funding",
  "customer_id": "bb6c6022-f1d8-492f-80f0-7547134bb42f",
  "client_reference": "card_funding_002"
}
'
```