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External accounts are bank accounts, cryptocurrency wallets, or payment destinations outside Grid where you can send funds. Grid supports two types:
  • Customer external accounts - Scoped to individual customers, used for withdrawals and customer-specific payouts
  • Platform external accounts - Scoped to your platform, used for platform-wide operations like receiving funds from external sources
Customer external accounts often require some basic beneficiary information for compliance. Platform accounts are managed at the organization level.

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Create external accounts by region or wallet

  • United States
  • Mexico
  • Brazil
  • Europe
  • India
  • Cryptocurrency
ACH, Wire, RTP
cURL
curl -X POST 'https://api.lightspark.com/grid/2025-10-13/customers/external-accounts' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET' \
  -H 'Content-Type: application/json' \
  -d '{
    "currency": "USD",
    "platformAccountId": "user_123_primary_bank",
    "accountInfo": {
      "accountType": "US_ACCOUNT",
      "accountNumber": "123456789",
      "routingNumber": "021000021",
      "accountCategory": "CHECKING",
      "bankName": "Chase Bank",
      "beneficiary": {
        "beneficiaryType": "INDIVIDUAL",
        "fullName": "John Doe",
        "birthDate": "1990-01-15",
        "nationality": "US",
        "address": {
          "line1": "123 Main Street",
          "city": "San Francisco",
          "state": "CA",
          "postalCode": "94105",
          "country": "US"
        }
      }
    }
  }'
Category must be CHECKING or SAVINGS. Routing number must be 9 digits.
Use platformAccountId to tie your internal id with the external account.
Sample Response: 
{
  "id": "ExternalAccount:e85dcbd6-dced-4ec4-b756-3c3a9ea3d965",
  "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
  "status": "ACTIVE",
  "currency": "USD",
  "platformAccountId": "user_123_primary_bank",
  "accountInfo": {
    "accountType": "US_ACCOUNT",
    "accountNumber": "123456789",
    "routingNumber": "021000021",
    "accountCategory": "CHECKING",
    "bankName": "Chase Bank",
    "beneficiary": {
      "beneficiaryType": "INDIVIDUAL",
      "fullName": "John Doe",
      "birthDate": "1990-01-15",
      "nationality": "US",
      "address": {
        "line1": "123 Main Street",
        "city": "San Francisco",
        "state": "CA",
        "postalCode": "94105",
        "country": "US"
      }
    }
  }
}

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Business beneficiaries

For business accounts, include business information: 
{
  "currency": "USD",
  "platformAccountId": "acme_corp_account",
  "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
  "accountInfo": {
    "accountType": "US_ACCOUNT",
    "accountNumber": "987654321",
    "routingNumber": "021000021",
    "accountCategory": "CHECKING",
    "bankName": "Chase Bank",
    "beneficiary": {
      "beneficiaryType": "BUSINESS",
      "businessInfo": {
        "legalName": "Acme Corporation, Inc.",
        "taxId": "EIN-987654321"
      },
      "address": {
        "line1": "456 Business Ave",
        "city": "New York",
        "state": "NY",
        "postalCode": "10001",
        "country": "US"
      }
    }
  }
}

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Account status

Beneficiary data may be reviewed for risk and compliance. Only ACTIVE accounts can receive payments. Updates to account data may trigger account re-review.
StatusDescription
PENDINGCreated, awaiting verification
ACTIVEVerified and ready for transactions
UNDER_REVIEWAdditional review required
INACTIVEDisabled, cannot be used

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Listing external accounts

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List customer accounts

curl -X GET 'https://api.lightspark.com/grid/2025-10-13/customers/external-accounts?customerId=Customer:019542f5-b3e7-1d02-0000-000000000001' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET'

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List platform accounts

For platform-wide operations, list all platform-level external accounts: 
curl -X GET 'https://api.lightspark.com/grid/2025-10-13/platform/external-accounts' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET'
Platform external accounts are used for platform-wide operations like depositing funds from external sources.

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Best practices

Validate account details before submission:
// US accounts: 9-digit routing, 4-17 digit account number
if (!/^\d{9}$/.test(routingNumber)) {
  throw new Error("Invalid routing number");
}

// CLABE: exactly 18 digits
if (!/^\d{18}$/.test(clabeNumber)) {
  throw new Error("Invalid CLABE number");
}
Verify status before sending payments:
if (account.status !== "ACTIVE") {
  throw new Error(`Account is ${account.status}, cannot process payment`);
}
Never expose full account numbers. Display only masked info:
function displaySafely(account) {
  return {
    id: account.id,
    bankName: account.accountInfo.bankName,
    lastFour: account.accountInfo.accountNumber.slice(-4),
    status: account.status,
  };
}

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Using external accounts for ramps

External accounts serve as destinations for ramp conversions:

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For on-ramps (Fiat → Crypto)

External accounts represent crypto wallet destinations:
  • Spark wallets: Lightning Network wallets for instant Bitcoin delivery
  • Self-custody: User-controlled wallets for full ownership
  • No beneficiary required: Crypto wallets don’t need compliance information
Spark wallets are the recommended destination for on-ramps due to instant settlement and minimal fees.

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For off-ramps (Crypto → Fiat)

External accounts represent bank account destinations:
  • Traditional bank accounts: ACH, wire, SEPA, CLABE, PIX, UPI, etc.
  • Beneficiary required: Full compliance information needed for fiat destinations
  • Multiple currencies: Support for USD, EUR, MXN, BRL, INR, and more
Off-ramp destinations require complete beneficiary information for compliance. Ensure all required fields are provided.

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Crypto wallet destinations

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Spark wallet addresses

The primary destination type for on-ramps: 
curl -X POST 'https://api.lightspark.com/grid/2025-10-13/customers/external-accounts' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET' \
  -H 'Content-Type: application/json' \
  -d '{
    "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
    "currency": "BTC",
    "platformAccountId": "user_wallet_001",
    "accountInfo": {
      "accountType": "SPARK_WALLET",
      "address": "spark1pgssyuuuhnrrdjswal5c3s3rafw9w3y5dd4cjy3duxlf7hjzkp0rqx6dj6mrhu"
    }
  }'
Response: 
{
  "id": "ExternalAccount:wallet001",
  "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
  "status": "ACTIVE",
  "currency": "BTC",
  "platformAccountId": "user_wallet_001",
  "accountInfo": {
    "accountType": "SPARK_WALLET",
    "address": "spark1pgssyuuuhnrrdjswal5c3s3rafw9w3y5dd4cjy3duxlf7hjzkp0rqx6dj6mrhu"
  },
  "createdAt": "2025-10-03T14:00:00Z"
}
Spark wallet external accounts are immediately ACTIVE and ready for on-ramp conversions.

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Validate Spark addresses

Before creating external accounts, validate Spark wallet addresses: 
function isValidSparkAddress(address) {
  // Spark addresses start with 'spark1' and are 87 characters
  return address.startsWith("spark1") && address.length === 87;
}

const walletAddress =
  "spark1pgssyuuuhnrrdjswal5c3s3rafw9w3y5dd4cjy3duxlf7hjzkp0rqx6dj6mrhu";

if (!isValidSparkAddress(walletAddress)) {
  throw new Error("Invalid Spark wallet address format");
}

// Create external account
await createExternalAccount({
  customerId,
  currency: "BTC",
  accountInfo: {
    accountType: "SPARK_WALLET",
    address: walletAddress,
  },
});
Spark addresses are case-insensitive and follow the bech32 format starting with spark1.

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Bank account destinations

For off-ramp flows, create external bank accounts with full beneficiary information:

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Example: US bank account for off-ramp

curl -X POST 'https://api.lightspark.com/grid/2025-10-13/customers/external-accounts' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET' \
  -H 'Content-Type: application/json' \
  -d '{
    "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
    "currency": "USD",
    "platformAccountId": "user_bank_usd_001",
    "accountInfo": {
      "accountType": "US_ACCOUNT",
      "accountNumber": "123456789",
      "routingNumber": "021000021",
      "accountCategory": "CHECKING",
      "bankName": "Chase Bank",
      "beneficiary": {
        "beneficiaryType": "INDIVIDUAL",
        "fullName": "John Doe",
        "birthDate": "1990-01-15",
        "nationality": "US",
        "address": {
          "line1": "123 Main Street",
          "city": "San Francisco",
          "state": "CA",
          "postalCode": "94105",
          "country": "US"
        }
      }
    }
  }'

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Creating accounts inline with quotes

For one-time conversions, create external accounts inline using externalAccountDetails: 
curl -X POST 'https://api.lightspark.com/grid/2025-10-13/quotes' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET' \
  -H 'Content-Type: application/json' \
  -d '{
    "source": {
      "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
      "currency": "USD"
    },
    "destination": {
      "externalAccountDetails": {
        "customerId": "Customer:019542f5-b3e7-1d02-0000-000000000001",
        "currency": "BTC",
        "accountInfo": {
          "accountType": "SPARK_WALLET",
          "address": "spark1pgssyuuuhnrrdjswal5c3s3rafw9w3y5dd4cjy3duxlf7hjzkp0rqx6dj6mrhu"
        }
      }
    },
    "lockedCurrencySide": "SENDING",
    "lockedCurrencyAmount": 10000
  }'
Use externalAccountDetails for one-time destinations. The external account will be automatically created and can be reused for future quotes using its returned ID.

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Listing external accounts

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List customer external accounts

curl -X GET 'https://api.lightspark.com/grid/2025-10-13/customers/external-accounts?customerId=Customer:019542f5-b3e7-1d02-0000-000000000001' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET'

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Filter by currency

curl -X GET 'https://api.lightspark.com/grid/2025-10-13/customers/external-accounts?customerId=Customer:019542f5-b3e7-1d02-0000-000000000001&currency=BTC' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET'

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Filter by account type

curl -X GET 'https://api.lightspark.com/grid/2025-10-13/customers/external-accounts?customerId=Customer:019542f5-b3e7-1d02-0000-000000000001&accountType=SPARK_WALLET' \
  -H 'Authorization: Basic $GRID_CLIENT_ID:$GRID_CLIENT_SECRET'

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Account status and verification

External accounts move through verification states:
StatusDescriptionCan Use for Conversions
PENDINGVerification in progress❌
ACTIVEVerified and ready✅
FAILEDVerification failed❌
DISABLEDManually disabled❌
Spark wallet accounts are immediately ACTIVE. Bank accounts may require verification (typically instant to a few hours).

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Best practices for ramps

Always validate wallet addresses and bank account details before creating external accounts:
// Validate Spark address format
function validateSparkAddress(address) {
  if (!address.startsWith("spark1")) {
    throw new Error("Spark address must start with spark1");
  }
  if (address.length !== 87) {
    throw new Error("Spark address must be 87 characters");
  }
  // Additional validation logic
  return true;
}
Map external accounts to your internal system using platformAccountId:
const externalAccount = await createExternalAccount({
  customerId,
  currency: "BTC",
  platformAccountId: `${userId}_spark_primary`, // Your internal ID
  accountInfo: {
    accountType: "SPARK_WALLET",
    address: sparkAddress,
  },
});

// Store mapping in your database
await db.userWallets.create({
  userId,
  gridAccountId: externalAccount.id,
  internalId: `${userId}_spark_primary`,
});
Support multiple wallets or bank accounts for flexibility:
// Primary Spark wallet for on-ramps
await createExternalAccount({
  customerId,
  currency: "BTC",
  platformAccountId: `${userId}_spark_primary`,
  accountInfo: { accountType: "SPARK_WALLET", address: primaryWallet },
});

// Secondary wallet for larger amounts
await createExternalAccount({
  customerId,
  currency: "BTC",
  platformAccountId: `${userId}_spark_savings`,
  accountInfo: { accountType: "SPARK_WALLET", address: savingsWallet },
});
For crypto destinations, implement additional verification:
// Verify Spark wallet is reachable (optional)
async function verifySparkWallet(address) {
  try {
    // Use Lightning Network tools to verify wallet exists
    const probe = await lightningClient.probeWallet(address);
    return probe.reachable;
  } catch (error) {
    console.error("Wallet verification failed:", error);
    return false;
  }
}

// Only create external account after verification
if (await verifySparkWallet(sparkAddress)) {
  await createExternalAccount({
    /* ... */
  });
}

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Ramp-specific considerations

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On-ramp destinations

  • Instant delivery: Spark wallets receive Bitcoin within seconds
  • No KYC required: Self-custody wallets don’t need beneficiary info
  • Reusable addresses: Store and reuse Spark addresses for multiple conversions
  • No minimum: Send any amount supported by Lightning Network

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Off-ramp destinations

  • Full compliance: Bank accounts require complete beneficiary information
  • Verification delays: Bank account verification may take a few hours
  • Settlement times: Vary by destination (instant for RTP/PIX, 1-3 days for ACH)
  • Amount limits: Check minimum and maximum amounts per destination currency
Always verify account details before initiating large off-ramp conversions. Test with small amounts first.

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Next steps

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