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How to get erc20 token approvals

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​

In order to get erc20 token approvals, Blocklens provides you a getErc20Approvals endpoint to do so.

import Blocklens from "blocklens-sdk";

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

const runApis = async () => {
  const response = await blocklens.ETH_MAINNET.getErc20Approvals();
  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.eyJpZCI6MTgyODMyODYwMDE3MDAwMTMwLCJwYWdlIjoxLCJpYXQiOjE2OTcwNjMyNzZ9.Q0pUi8U_X7sO7q5A6Jtg7TiSuvkN2aZM9uZhza0oqM8",
  "page": 1,
  "limit": 20,
  "total_items": 1,
  "data": [
    {
      "token_name": "Liquid staked Ether 2.0",
      "token_symbol": "stETH",
      "token_decimals": 18,
      "contract_address": "0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84",
      "transaction_hash": "0x0ba709383fc1378e6a75101ff09e1a9bd3ee19eb3e448dfb457444eb4fe8d031",
      "transaction_index": 129,
      "log_index": 350,
      "block_hash": "0x9dce9c505115b31b6afcae07d5b3ddc2bdf4ca89469682cc79cbc64fe12bce7b",
      "block_number": 18283286,
      "from_wallet": "0xF0D98b95BBbE6e3007703C99A9FFC3D9f5b581E6",
      "to_wallet": "0x1111111254EEB25477B68fb85Ed929f73A960582",
      "value": "7044483623640093",
      "value_decimal": "0.007044483623640093",
      "timestamp": 1696496531
    }
  ]
}

Congratulations 🥳 you just found the get erc20 token approvals 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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