Skip to main content
Internal accounts are Lightspark managed accounts that hold funds within the Grid platform. They allow you to receive deposits and send payments to external bank accounts or other payment destinations. They are useful for holding funds on behalf or the platform or customers which will be used for instant, 24/7 quotes and transfers out of the system. Internal accounts are created for both:
  • Platform-level accounts: Hold pooled funds for your platform operations (rewards distribution, reconciliation, etc.)
  • Customer accounts: Hold individual customer funds for their transactions
Internal accounts are automatically created when you onboard a customer, based on your platform’s currency configuration. Platform-level internal accounts are created when you configure your platform with supported currencies.

​
How internal accounts work

Internal accounts act as an intermediary holding account in the payment flow:
  1. Deposit funds: You or your customers deposit money into internal accounts using bank transfers (ACH, wire, PIX, etc.) or crypto transfers
  2. Hold balance: Funds are held securely in the internal account until needed
  3. Send payments: You initiate transfers from internal accounts to external destinations
Each internal account:
  • Is denominated in a single currency (USD, EUR, etc.)
  • Has a unique balance that you can query at any time
  • Includes unique payment instructions for depositing funds
  • Supports multiple funding methods depending on the currency

​
Retrieving internal accounts

​
List customer internal accounts

To retrieve all internal accounts for a specific customer, use the customer ID to filter the results:
Request internal accounts for a customer
curl -X GET 'https://api.lightspark.com/grid/2025-10-13/customers/internal-accounts?customerId=Customer:019542f5-b3e7-1d02-0000-000000000001' \
  -u "$GRID_CLIENT_ID:$GRID_CLIENT_SECRET"

{
  "data": [
    {
      "id": "InternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965",
      "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
      "balance": {
        "amount": 50000,
        "currency": {
          "code": "USD",
          "name": "United States Dollar",
          "symbol": "$",
          "decimals": 2
        }
      },
      "fundingPaymentInstructions": [
        {
          "reference": "FUND-ABC123",
          "instructionsNotes": "Include the reference code in your ACH transfer memo",
          "bankAccountInfo": {
            "accountType": "US_ACCOUNT",
            "accountNumber": "9876543210",
            "routingNumber": "021000021",
            "accountHolderName": "Lightspark Payments FBO John Doe",
            "bankName": "JP Morgan Chase"
          }
        }
      ],
      "createdAt": "2025-10-03T12:00:00Z",
      "updatedAt": "2025-10-03T14:30:00Z"
    }
  ],
  "hasMore": false,
  "totalCount": 1
}

​
Filter by currency

You can filter internal accounts by currency to find accounts for specific denominations: 
curl -X GET 'https://api.lightspark.com/grid/2025-10-13/customers/internal-accounts?customerId=Customer:019542f5-b3e7-1d02-0000-000000000001&currency=USD' \
  -u "$GRID_CLIENT_ID:$GRID_CLIENT_SECRET"

​
List platform internal accounts

To retrieve platform-level internal accounts (not tied to individual customers), use the platform internal accounts endpoint: 
curl -X GET 'https://api.lightspark.com/grid/2025-10-13/platform/internal-accounts' \
  -u "$GRID_CLIENT_ID:$GRID_CLIENT_SECRET"
Platform internal accounts are useful for managing pooled funds, distributing rewards, or handling platform-level operations.

​
Understanding funding payment instructions

Each internal account includes fundingPaymentInstructions that tell your customers how to deposit funds. The structure varies by payment rail and currency:
For USD accounts, instructions include routing and account numbers:
{
  "reference": "FUND-ABC123",
  "instructionsNotes": "Include the reference code in your ACH transfer memo",
  "bankAccountInfo": {
    "accountType": "US_ACCOUNT",
    "accountNumber": "9876543210",
    "routingNumber": "021000021",
    "accountHolderName": "Lightspark Payments FBO John Doe",
    "bankName": "JP Morgan Chase"
  }
}
Each internal account has unique banking details in the bankAccountInfo field, which ensures deposits are automatically credited to the correct account.
For EUR accounts, instructions use SEPA IBAN numbers:
{
  "reference": "FUND-EUR789",
  "instructionsNotes": "Include reference in SEPA transfer description",
  "bankAccountInfo": {
    "accountType": "IBAN",
    "iban": "DE89370400440532013000",
    "swiftBic": "DEUTDEFF",
    "accountHolderName": "Lightspark Payments FBO Maria Garcia",
    "bankName": "Banco de México"
  }
}
For stablecoin accounts, instructions use Spark wallet addresses:
{
  "invoice": "lnbc15u1p3xnhl2pp5jptserfk3zk4qy42tlucycrfwxhydvlemu9pqr93tuzlv9cc7g3sdqsvfhkcap3xyhx7un8cqzpgxqzjcsp5f8c52y2stc300gl6s4xswtjpc37hrnnr3c9wvtgjfuvqmpm35evq9qyyssqy4lgd8tj637qcjp05rdpxxykjenthxftej7a2zzmwrmrl70fyj9hvj0rewhzj7jfyuwkwcg9g2jpwtk3wkjtwnkdks84hsnu8xps5vsq4gj5hs",
  "instructionsNotes": "Use the invoice when making Spark payment",
  "bankAccountInfo": {
    "accountType": "SPARK_WALLET",
    "asset": "USDB",
    "address": "spark1pgssyuuuhnrrdjswal5c3s3rafw9w3y5dd4cjy3duxlf7hjzkp0rqx6dj6mrhu"
  }
}

​
Checking account balances

The internal account balance reflects all deposits and withdrawals. The balance includes:
  • amount: The balance amount in the smallest currency unit (cents for USD, centavos for MXN/BRL, etc.)
  • currency: Full currency details including code, name, symbol, and decimal places

​
Example balance check

Fetch the balance of an internal account
curl -X GET 'https://api.lightspark.com/grid/2025-10-13/customers/internal-accounts/InternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965' \
  -u "$GRID_CLIENT_ID:$GRID_CLIENT_SECRET"

{
  "data": {
    "id": "InternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965",
    "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
    "balance": {
      "amount": 50000,
      "currency": {
        "code": "USD",
        "name": "United States Dollar",
        "symbol": "$",
        "decimals": 2
      }
    }
  }
}
Always check the decimals field in the currency object to correctly convert between display amounts and API amounts. For example, USD has 2 decimals, so an amount of 50000 represents $500.00.

​
Displaying funding instructions to customers

When customers need to deposit funds themselves, display the funding payment instructions in your application:
1

Retrieve the internal account

Fetch the customer’s internal account for their desired currency using the API.
2

Extract payment instructions

Parse the fundingPaymentInstructions array and select the appropriate instructions based on your customer’s preferred payment method.
const instructions = account.fundingPaymentInstructions[0];
const bankInfo = instructions.bankAccountInfo;
3

Display instructions clearly

Show the payment details prominently in your UI:
  • Account holder name
  • Bank name and routing information (account/routing number, CLABE, PIX key, etc.)
  • Reference code (if provided)
  • Any additional notes from instructionsNotes
The unique banking details in each internal account automatically route deposits to the correct destination.
4

Monitor for deposits

Set up webhook listeners to receive notifications when deposits are credited to the internal account. The account balance will update automatically.
You’ll receive ACCOUNT_STATUS webhook events when the internal account balance changes.

​
Best practices

Ensure your customers have all the information needed to make deposits. Consider implementing:
  • Clear display of all banking details from fundingPaymentInstructions
  • Copy-to-clipboard functionality for account numbers and reference codes
  • Email/SMS confirmations with complete deposit instructions
Set up monitoring to alert customers when their balance is low:
if (account.balance.amount < minimumThreshold) {
  await notifyCustomer({
    type: 'LOW_BALANCE',
    account: account.id,
    instructions: account.fundingPaymentInstructions
  });
}
If your platform supports multiple currencies, organize internal accounts by currency in your UI:
const accountsByCurrency = accounts.data.reduce((acc, account) => {
  const code = account.balance.currency.code;
  acc[code] = account;
  return acc;
}, {});

// Quick lookup: accountsByCurrency['USD']
Internal account details (especially funding instructions) rarely change, so you can cache them safely. However, always fetch fresh balance data before initiating transfers.

​
Next steps

External accounts

Learn how to add customer wallets as reward destinations

Plaid integration

Simplify bank account verification with Plaid Link

Cross-currency transfers

Use internal account balances to send Bitcoin rewards

API Reference

View complete API documentation for internal accounts
⌘I