How to Query the Latest USDT Transactions on the Tron Network

Tracking payments on the blockchain is essential for many applications, especially when handling user deposits or payment confirmations. This guide explains how to use the TronGrid API to query the latest USDT (TRC-20) transactions for a specific wallet address.

Understanding Payment Monitoring

When a user makes a deposit to a designated wallet address, the system must verify whether the transaction has been successfully confirmed on the blockchain. By querying the recent transaction history of that wallet, you can identify new incoming transfers and update the user’s balance accordingly.

This process is similar to checking a verification code: the user triggers a query, and the system scans for new transactions. If a valid transaction is found, the system marks it as completed and credits the user’s account.

Official TronGrid API Endpoint

To retrieve the latest USDT transactions for a Tron wallet, you can use the following official API:

Request URL
https://api.trongrid.io/v1/accounts/{address}/transactions/trc20?limit=100&contract_address=TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t

Request Method
GET

Replace {address} with the actual wallet address you want to monitor.

How the Payment Monitoring System Works

Here are two common approaches to implementing a USDT deposit system using Tron wallet addresses:

Approach 1: Dedicated Wallet per User

Generate a unique wallet address for each user.
When a user initiates a deposit, assign them one of these addresses.
Periodically query the transaction history of that address using the TronGrid API.
If a new transaction is found, record its transaction_id as a unique order ID in your database.
Credit the user’s account and optionally consolidate the funds.

This method allows precise tracking per user and simplifies deposit management.

Approach 2: Pool of Shared Wallets

Pre-generate a pool of wallet addresses.
When a user wants to deposit, assign them an available address from the pool.
The user sends USDT to that address from their external wallet.
The system periodically scans all addresses in the pool for new transactions.
Upon detecting a successful transfer, the system updates the user’s balance and marks the transaction as processed.

Since blockchain confirmations take time, you can implement a cooldown period between user queries to avoid excessive API calls.

API Response Format

The API returns a JSON response containing an array of transaction objects. Here’s an example:

{
  "data": [
    {
      "transaction_id": "d52cd9079cf82595dd507640b7b09e34d2dbb63a56b555355f5ef8984f1eb668",
      "token_info": {
        "symbol": "USDT",
        "address": "TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t",
        "decimals": 6,
        "name": "Tether USD"
      },
      "block_timestamp": 1651903617000,
      "from": "TYPrKF2sevXuE86Xo3Y2mhFnjseiUcybny",
      "to": "TTRmEA73gpoxK2KRmhL7GtcYLh88VefYss",
      "type": "Transfer",
      "value": "15500000"
    }
  ],
  "success": true,
  "meta": {
    "at": 1652928398011,
    "page_size": 3
  }
}

Key fields:

transaction_id: The unique hash of the transaction.
from and to: Wallet addresses involved in the transfer.
value: The amount transferred (in the smallest unit, considering decimals).
block_timestamp: The time when the transaction was confirmed.

Implementing Query Logic

To integrate this into your system:

Store wallet addresses and associated user IDs in your database.
Schedule periodic checks or trigger queries when the user clicks a “Check Deposit” button.
Parse the API response and look for transactions where the to field matches your wallet address.
Verify the transaction ID hasn’t been processed already.
Convert the value based on the token’s decimals (e.g., divide by 1,000,000 for USDT).
Update the user’s balance and record the transaction as completed.

For larger systems, consider using webhooks or subscribing to blockchain events for real-time updates.

👉 Explore real-time transaction monitoring tools

Frequently Asked Questions

How often should I query the API?

It depends on your needs. For user-triggered checks, you can query immediately. For automated systems, polling every 30–60 seconds is reasonable. Avoid excessive requests to respect API rate limits.

What does the “value” field represent?

The “value” is the amount in the smallest unit of the token. For USDT (which has 6 decimals), you must divide the value by 1,000,000 to get the actual amount.

How can I avoid processing duplicate transactions?

Always store the transaction_id of processed transfers in your database. Before crediting a user, check if that ID already exists in your records.

What if the API doesn’t return new transactions?

Blockchain confirmations can take time. If a transaction is recent, it might not yet be reflected in the API response. Implement retry logic or wait for several confirmations.

Can I use this for other TRC-20 tokens?

Yes. Replace the contract_address parameter with the token’s contract address. The same logic applies.

Is this method secure?

Yes, as long as you rely on the official TronGrid API. However, implement additional checks like validating confirmations and amounts to prevent errors or fraud.

By using the TronGrid API, you can build a reliable system to monitor USDT transactions on the Tron blockchain. Whether you choose dedicated wallets or a pool-based approach, ensure you handle transaction idempotency and user feedback appropriately.