The TRON Developer Hub

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Integrating Blockchain APIs

Blockchain Data Polling

Tron Grid allows four methods for blockchain data polling:

  • By Contract Address:

// By default, the above line returns most recent 50 events. If you wish to return the most recent event:


// To return the second most recent event, execute:

  • By Contract Address and Event Name:

// To retrieve the most recent contract event:


// To retrieve the second most recent event, execute:

  • By Contract Address, Event Name, and Block Height:
  • By Transaction ID:

Request Parameters

// The parameter `since` sets a default time stamp of 0, and returns all events after that timestamp:


// The parameter `size` returns the number of results. Default is 20 results, and maximum is 200:


// The parameter `page` returns the page number. The below example returns latest 11 - 20th results:


// The parameter `sort` can take values of `block_timestamp`(Ascending order) or `-block_timestamp`(Descending order). Sorts results by block_timestamp. 

Example Contract

pragma solidity ^0.4.23;

contract Fibonacci {

    event Notify(uint input, uint result);

    function fibonacci(uint number) public constant returns(uint result) {
        if (number == 0) return 0;
        else if (number == 1) return 1;
        else return Fibonacci.fibonacci(number - 1) + Fibonacci.fibonacci(number - 2);

    function fibonacciNotify(uint number) public returns(uint result) {
        result = fibonacci(number);
        emit Notify(number, result);

Deploy contract using TronWeb, TronBox, or directly using RPC or HTTP call:

deploycontract DataStore [{"constant":false,"inputs":[{"name":"number","type":"uint256"}],"name":"fibonacciNotify","outputs":[{"name":"result","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"number","type":"uint256"}],"name":"fibonacci","outputs":[{"name":"result","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"input","type":"uint256"},{"indexed":false,"name":"result","type":"uint256"}],"name":"Notify","type":"event"}] 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 1000000 30 0

After triggering fibonacciNotify and event notify:

triggersmartcontract 417C5D1624B699C425355B99D1C8D188D367FA232D fibonacciNotify(uint256) 7 false 1000000 0000000000000000000000000000000000000000000000000000000000000000

Return Value:

    "block_number": 88,
    "block_timestamp": 1534767012000,
    "contract_address": "TMJnJcHfdP5rhmXVkwRYb1a9A6gS46PUm6",
    "event_name": "Notify",
    "result": [
    "transaction_id": "5c3747ffa94fc87a2188708a9e0758cbd01f000d3d01f6589651921930183f6a"

Return Format:

block_number: block height
block_timestamp: event time stamp
contract_address: contract address
event_name: event name
result: event parameter
transaction_id: transcation id

Blockchain Interaction

Use Tron-Web & Tron-Grid to interact with the Blockchain:

import TronWeb from 'TronWeb'

const HttpProvider = TronWeb.providers.HttpProvider; // Optional provider, can just use a url for the nodes instead

const fullNode = new HttpProvider(''); // Full node http endpoint
const solidityNode = new HttpProvider(''); // Solidity node http endpoint
const eventServer = ''; // Contract events http endpoint
const privateKey = 'da146374a75310b9666e834ee4a...c76217c5a495fff9f0d0';

const tronWeb = new TronWeb(
// The majority of the function calls are asynchronus, 
// meaning that they cannot return the result instantly.
// These methods therefore return a promise, which you can await.
const balance = await tronWeb.trx.getBalance(address);
console.log({ balance });

// You can also bind a `then` and `catch` method.
tronWeb.trx.getBalance(address).then(balance => {
console.log({ balance });
}).catch(err => console.error(err));

// If you'd like to use a similar API to Web3, provide a callback function.
tronWeb.trx.getBalance(address, (err, balance) => {
    return console.error(err);
    console.log({ balance });