Integrating a reliable and efficient USDT recharge interface is essential for modern digital asset platforms, payment gateways, and blockchain-based services. This comprehensive guide walks you through the updated USDT recharge API offered by CrossingPay, now upgraded to a high-performance V2 version optimized for seamless global transactions.
👉 Discover how to integrate fast, secure USDT deposits with advanced merchant tools.
Whether you're building a cryptocurrency exchange, wallet service, or fintech application, understanding this API's structure, parameters, and response logic ensures smooth integration and real-time transaction processing.
Overview of the USDT Recharge Interface
The USDT recharge API allows merchants to initiate and track user deposits in a secure, automated manner. It supports stablecoin transactions (primarily USDT) across blockchain networks, enabling businesses to accept digital payments with precision and speed.
Note: The original API has been deprecated. A more robust V2 version is now available—optimized for network stability and higher throughput. For full details, refer to the updated documentation.
Core Endpoint
- API Endpoint:
/api/merchant/TraderRechargeorder - Request Method:
POST - Function: Initiate a user recharge order
This endpoint serves as the foundation for creating deposit records, linking them to merchant systems via unique identifiers, and enabling asynchronous confirmation through callback notifications.
Required Request Parameters
To successfully create a recharge order, your system must submit the following parameters in the POST request body. All data should be sent in standard JSON format unless otherwise specified.
| Parameter | Required | Description |
|---|---|---|
username | Yes | End-user identifier on your platform (e.g., a123456) |
appid | Yes | Your assigned API key for authentication |
localusermark | Yes | Internal user tag used during callback processing |
address | Yes | Unique deposit address generated for the user; required for blockchain monitoring |
orderid | Yes | Merchant-side order ID; used to reconcile transactions |
amount | Yes | Expected deposit amount in USDT; if actual differs, system accepts actual unless strict validation is enabled |
notify_url | No | Custom callback URL; if omitted, defaults to the one configured in your merchant dashboard |
sign | Yes | HMAC-SHA256 signature for request integrity verification |
Ensure all fields are correctly formatted and signed before submission to prevent processing failures.
Response Structure and Interpretation
After submitting a recharge request, the API returns a structured JSON response indicating success or failure. Understanding this format helps in debugging and confirming order creation status.
Key Response Fields
status:1= Success- Any other value = Failure
err: Present only whenstatus ≠ 1; contains error messagedata: Returned on success; includes:msg: Human-readable result (e.g.,"Operation successful")ordersn: System-generated UUID (up to 50 characters), used for tracking
Sample Success Response
{
"status": 1,
"data": {
"msg": "Operation successful",
"ordersn": "cz-7773c1e0*****fc698d2"
}
}Upon receiving this response, your system should store the ordersn locally and await confirmation via the callback mechanism.
👉 Learn how top platforms handle real-time deposit tracking and reconciliation.
Asynchronous Callback Notification
Once a user’s transaction is confirmed on-chain, the system triggers an asynchronous HTTP POST request to your designated notify_url (or default from settings). This ensures your backend receives timely updates without polling.
Callback Parameters
array (
'orderid' => 'sh-56073d***8a2ff5521a', // Merchant order ID
'localusermark' => '1', // User identifier
'amount' => '30000', // Amount received (divide by 10000 for decimal)
'appid' => 'VunT***h1l8', // Merchant app ID
't' => '1662299838', // Unix timestamp
'sign' => '237A3D3EEFE6***F408EA7EFFB1F2' // Signature for verification
)Important Notes on Callback Handling
- Amount Precision: The
amountfield uses integer representation with four decimal places (e.g., 30000 = 3.0000 USDT). Always divide by 10000 to get the true value. - Timestamp Validation: Use the
tparameter to verify message freshness and prevent replay attacks. - Signature Verification: Recompute the signature using your secret key and compare it with the received
signvalue. Refer to official signing guidelines for algorithm specifics.
Your server must respond with success (plain text) upon successful receipt. Any other response may trigger retry mechanisms.
Security Best Practices
Secure integration is critical when handling financial transactions. Follow these recommendations:
- Validate Signatures: Never trust incoming data without verifying the HMAC signature.
- Use HTTPS: Ensure your
notify_urluses TLS encryption. - Rate Limiting: Implement safeguards against excessive callback requests.
- Input Sanitization: Clean and validate all incoming parameters to prevent injection attacks.
- Log Transactions: Maintain detailed logs for auditing and dispute resolution.
Core Keywords for SEO Optimization
To align with search intent and improve visibility, the following keywords have been naturally integrated throughout this guide:
- USDT recharge API
- cryptocurrency deposit integration
- merchant payment gateway
- blockchain transaction callback
- digital asset payment processing
- stablecoin payment solution
- API integration for developers
- secure crypto deposit system
These terms reflect common queries from developers and fintech teams implementing crypto payment flows.
Frequently Asked Questions (FAQ)
Q: Is the original API still functional?
A: No. The legacy version has been discontinued. All users must migrate to the V2 version, which offers improved performance, better uptime, and enhanced security features.
Q: How do I verify the callback signature?
A: Use your private API secret to generate an HMAC-SHA256 hash of the sorted parameter string (excluding sign) and compare it with the received signature. Detailed steps are available in the developer documentation.
Q: What happens if a user sends more or less than the expected amount?
A: By default, the system credits whatever amount is received. However, you can enable strict mode during configuration to reject mismatches and require exact amounts.
Q: Can I change the callback URL per transaction?
A: Yes. Include the notify_url parameter in your request. If omitted, the system uses the global callback URL set in your merchant panel.
Q: How long does it take for a deposit to be confirmed?
A: Confirmation time depends on blockchain network congestion. Typically, USDT transfers on TRON or Ethereum settle within 1–3 minutes under normal conditions.
Q: Where can I find the V2 API documentation?
A: Visit the official development portal for complete technical specs, code samples, and migration guides.
👉 Access advanced tools for managing crypto deposits at scale.
This guide provides everything needed to implement a secure and scalable USDT recharge system using CrossingPay’s upgraded API. With proper integration, businesses can offer fast, reliable digital asset deposits while maintaining full control over transaction lifecycle management.