Converting funds in and out of wallets

Now that we've created our first wallet for an end-user, we want to add a crypto balance. To do this we will need fiat currency in our fiat wallets on the platform (details of the account numbers can be found in the BVNK portal) and, after ensuring there are funds available, we will use the Create quote endpoint to execute a trade.

curl --request POST \
     --url \
     --header 'Accept: application/json' \
     --header 'Authorization: Hawk id="B9jnE1U8eLblzHtNeJZRxfcq03CQKcmcP9FOrACMzXb1HfrxrePWsTfuP70JNns9", ts="1633010032", nonce="guGXrD", mac="uKeg+w1qXqzaF/8mOQGv8Y9IlRxyxTT+iINLe03EQ60="' \
     --header 'Content-Type: application/json' \
     --data '
     "merchantId": "93403",
     "from": "EUR",
     "to": "ETH",
     "payInMethod": "wallet",
     "payOutMethod": "crypto",
     "amountIn": 100,
     "payOutInstruction": {
          "code": "crypto",
          "currency": "ETH",
          "address": "0xEa61651823dEc1027565AFB908A0c5C06662cdBf"

Let's look at the inputs required to create a quote:

merchantIdstringYour Merchant ID. You can find it on the Merchant Details page in your account.

See this guide for creating one
fromstringThe originating currency you are holding on platform and will be trading from.
tostringThe end currency you are trading into.
payInMethodstringSet to wallet to ensure funds are moved on platform.
payOutMethodstringSet to crypto to ensure this crypto is sent on to your client based wallet, rather than just your own balance.
amountInbig decimalThe amount in originating currency you'd like to convert.
payOutInstruction.codestringSet to crypto.
payOutInstruction.currencystringThe currency code of the crypto asset you're sending. (this must be the same as the to value.
payOutInstruction.protocolstringIf you're sending an asset present on multiple protocols (like USDC) then you'll need to specify the protocol (e.g. ERC20 or TRC20 in the case of USDC)
payOutInstruction.addressstringThe crypto address of the wallet we created in the previous step for our customer.

You'll receive a response from the API:

  "id": 93403,
  "from": "EUR",
  "to": "ETH",
  "amountIn": 100.000000000000000000,
  "amountDue": 100.000000000000000000,
  "amountOut": 0.008933300000000000,
  "price": 3470.162202097800000000,
  "quoteStatus": "PENDING",
  "paymentStatus": "PENDING",
  "acceptanceExpiryDate": 1640875693683,
  "paymentExpiryDate": 1640876572459,
  "paymentReceiptDate": null,
  "payInLegs": [],
  "payInMethod": {
    "id": 5,
    "code": "wallet",
    "settlementCurrency": "EUR",
    "requestedCurrency": null,
    "estimatedExchangeRate": null,
    "accountMethods": []
  "payOutMethod": {
    "id": 3,
    "code": "wallet",
    "currency": "ETH",
    "accountMethods": [
        "id": 161,
        "display": null
  "uuid": "379a66e4-d402-48f4-a2a9-d4735ef2c79f",
  "payOutInstruction": null,
  "payInInstruction": null,
  "usePayInMethod": null,
  "usePayOutMethod": null,
  "fee": 0.310000000000000006,
  "processingFee": 0E-18,
  "type": "FIXED",
  "netPrice": 3470.162202097800000000,
  "grossPrice": 3470.162202097800000000,
  "amountInGross": 31,
  "amountInNet": 31.000000000000000000,
  "fees": {
    "percentage": {
      "service": 0.0100,
      "processing": 0.0000
    "value": {
      "service": 0.31,
      "processing": 0
  "dateCreated": 1640875673705,
  "lastUpdated": 1640875673705

Next, you simply accept the quote with the Accept quote endpoint and the transaction will execute into the wallet you specified.


To withdraw fiat, you will need to log in to the BVNK portal and perform a withdrawal.

What’s Next