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Prerequisites

Before you begin, make sure you have:
  1. A source User with sufficient USDC balance
  2. A destination User or Wallet address

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Step 1: Check Source Wallet Balance

First, verify that the source wallet has sufficient USDC balance: GET /v2/users/{userId}/wallets/balance 
curl -X GET "https://sandbox.hifibridge.com/v2/users/{userId}/wallets/balance" \
  -H "Authorization: Bearer YOUR_API_KEY"
Response: 
{
  "balances": [
    {
      "currency": "usdc",
      "chain": "POLYGON",
      "balance": "1000.00",
      "availableBalance": "1000.00"
    }
  ]
}

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Step 2: Create Transfer

Send USDC from one wallet to another: POST /v2/wallets/transfers 
curl --request POST \
     --url https://sandbox.hifibridge.com/v2/wallets/transfers \
     --header 'Authorization: Bearer YOUR_API_KEY' \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '{
  "requestId": "transfer-001",
  "currency": "usdc",
  "amount": "100.00",
  "chain": "POLYGON",
  "source": {
    "userId": "source-user-id"
  },
  "destination": {
    "userId": "destination-user-id"
  },
  "requireApproval": false
}'

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Step 3: Monitor Transfer Status

Check the status of your transfer: GET /v2/wallets/transfers/{transferId} 
curl -X GET "https://sandbox.hifibridge.com/v2/wallets/transfers/{transferId}" \
  -H "Authorization: Bearer YOUR_API_KEY"
Response: 
{
  "transferType": "WALLET.TRANSFER",
  "transferDetails": {
    "id": "transfer-abc123",
    "requestId": "transfer-001",
    "status": "COMPLETED",
    "chain": "POLYGON",
    "currency": "usdc",
    "amount": "100.00",
    "source": {
      "userId": "source-user-id",
      "walletAddress": "0x1234...5678"
    },
    "destination": {
      "userId": "destination-user-id",
      "walletAddress": "0x8765...4321"
    },
    "receipt": {
      "transactionHash": "0x57f0cd3429ea425d982882243428ef4a1eda5f1be2157c1b34ea48b49b24fe7f"
    }
  }
}

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Transfer Statuses

Transfers progress through several statuses:
  • CREATED: Transfer has been created and is awaiting processing
  • PROCESSING: Transfer is being executed on the blockchain
  • COMPLETED: Transfer has been successfully completed
  • FAILED: Transfer failed (check failedReason for details)

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Advanced Options

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Transfer with Approval

Require admin approval before execution: 
curl --request POST \
     --url https://sandbox.hifibridge.com/v2/wallets/transfers \
     --header 'Authorization: Bearer YOUR_API_KEY' \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '{
  "requestId": "transfer-002",
  "currency": "usdc",
  "amount": "500.00",
  "chain": "POLYGON",
  "source": {
    "userId": "source-user-id"
  },
  "destination": {
    "userId": "destination-user-id"
  },
  "requireApproval": true
}'

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Transfer to External Wallet

Send to a specific wallet address: 
curl --request POST \
     --url https://sandbox.hifibridge.com/v2/wallets/transfers \
     --header 'Authorization: Bearer YOUR_API_KEY' \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '{
  "requestId": "transfer-003",
  "currency": "usdc",
  "amount": "50.00",
  "chain": "POLYGON",
  "source": {
    "userId": "source-user-id"
  },
  "destination": {
    "walletAddress": "0x742d35Cc6634C0532925a3b844Bc454e4438f44e"
  },
  "requireApproval": false
}'

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Error Handling

Common errors and how to handle them:
  • Insufficient funds: Check wallet balance before transfer
  • Invalid user: Verify destination user exists
  • Network issues: Retry with exponential backoff
  • Rate limits: Implement proper rate limiting
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