The aim of the research is to identify whether a user holds any balance for a specified Token. The research was done on Ethereum, Binance Smart Chain and Polygon network, and on the tokens ERC-20 and BEP-20.

About 2000 Blockchain Wallet addresses, downloaded from the above mentioned networks, were used as input.

• polkadot-token-2000-users.csv - List of 2000 users holding PolkaDot token (BEP-20)
• theta-token-2000-users.csv - List of 2000 users holding Theta Token (ERC-20)
• uniswap-token-2000-users.csv - List of 2000 users holding Uniswap token (ERC-20)

Following are the steps involved in the execution of the script app.js:

1. The necessary minimum ABI need and the required variables such as RPC endpoints and Contract Addresses are defined.

2. In order to process the requests in bulk, a instance of Web3.js Batch instance is defined

3. Iterating over User records, each request is added to the Batch Object for every wallet address.

4. Once added, batch.execute() runs the whole Batch to generate Token balance for every users.

• Ethereum RPC took about 20 seconds to retrieve all the balances.
• It took BSC (Binance Smart Chain) about 3 seconds to retrieve all the balances.
• Polygon Network, on it's free tier plan, had a 40 requests/sec limit on the public RPC endpoint, while the private RPC endpoint had a 100 requests/sec limit. Hence, batch execution for 2000 users was not possible