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How to get erc20 token approvals from time to time

Prerequisites​

Before getting started, make sure you have the following ready:

  • Node v.14+
  • NPM

Step 1: Setup Blocklens​

First register your Blocklens account and get your Blocklens API Key.

Once you have your Blocklens API Key, install the Blocklens SDK in your project.

npm i blocklens-sdk

Step 2: Get ERC20 token approvals from time to time​

In order to get erc20 token approvals from time to time, Blocklens provides you a getErc20ApprovalsByTimeRange endpoint to do so.

Here you'll need parameters: from_time, to_time.

Once you've obtained all the from_time, to_time, you can copy the following code:

import Blocklens from "blocklens-sdk";

const blocklens = new Blocklens();
blocklens.init({ apiKey: "YOUR_API_KEY" });

const runApis = async () => {
  const response = await blocklens.ETH_MAINNET.getErc20ApprovalsByTimeRange({"from_time":"1696048259","to_time":"1696048260"});
  console.log(response);
};

runApis();

Step 3: Run the script​

ts-node index.ts

In your terminal, you should see the following JSON response with the data: In your terminal, you should see the following JSON response with the data blocks:

{
  "cursor": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6MTgyNDYxNTAwMDA5MDAwMDYwLCJwYWdlIjoxLCJmcm9tVGltZSI6IjE2OTYwNDgyNTkiLCJ0b1RpbWUiOiIxNjk2MDQ4MjYwIiwiaWF0IjoxNjk3MDYzMjE3fQ.O2f1m6hf-tycWRgEyGuJnBNgf6u4p0vdtCRUceYyGJM",
  "page": 1,
  "limit": 20,
  "total_items": 1,
  "data": [
    {
      "token_name": "DXdao",
      "token_symbol": "DXD",
      "token_decimals": 18,
      "contract_address": "0xa1d65E8fB6e87b60FECCBc582F7f97804B725521",
      "transaction_hash": "0x69e0363e5b6276be1b56c2dbc9709ca6ae57e0779863ed03562728ba6015403b",
      "transaction_index": 121,
      "log_index": 325,
      "block_hash": "0x0517e1369f5159852973c47dc335d28b67ccffb238333542f880abc3fe3ab505",
      "block_number": 18246150,
      "from_wallet": "0x5554A279FF7A6313Dc686e1916B05Bd70e650D86",
      "to_wallet": "0xa7Ca2C8673bcFA5a26d8ceeC2887f2CC2b0Db22A",
      "value": "115792089237316195423570985008687907853269984665640564039457584007913129639935",
      "value_decimal": "115792089237316195423570985008687907853269984665640564039457.584007913129639935",
      "timestamp": 1696048259
    }
  ]
}

Congratulations 🥳 you just found the get erc20 token approvals from time to time on multiple chains with only a few lines of code using the Blocklens Wallet API!

API Reference​

If you want to know more details on the endpoint and optional parameters, check out:

Support​

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