Here is an article on how to retrieve the USD value of ERC-20 tokens transferred via Etherscan API:

Retrieving the USD value of ERC-20 tokens transferred via Etherscan API

As a developer working on projects involving blockchain and cryptocurrency, you are probably familiar with the importance of accurately tracking the value of assets transferred between wallets. In this article, we will explore how to retrieve the USD value of ERC-20 tokens transferred via Etherscan API.

What is ERC-20?

ERC-20 (Ethereum Standard) is a token standard for building decentralized applications (dApps) on the Ethereum blockchain. It is one of the most widely used token standards and has gained immense popularity in recent years. ERC-20 tokens are typically used as store of value (SOV) assets, allowing users to hold, trade, and invest in them.

Etherscan API

Etherscan is a popular blockchain data provider that offers a robust set of APIs to access Ethereum related data. The Etherscan API provides a convenient way to retrieve information about ERC-20 tokens, including their balance, token ID, name, symbol, and more.

Retrieving USD value via Etherscan API

To retrieve the USD value of ERC-20 tokens transferred via the Etherscan API, you can follow these steps:

• Create an Etherscan account: If you haven’t already, create a free Etherscan account to access their API.

• Install the Etherscan Python library: You will need to install the etherscan Python library to interact with the API. You can do this by running pip install etherscan-api.

• API Authentication: Use your username and password to authenticate with the Etherscan API.

• Use ERC-20 Token Endpoint: The ERC-20 Token Endpoint provides information about a specific ERC-20 token, including its USD balance.

• Send a GET Request

  : Send a GET request to the ERC-20 Token Endpoint using your chosen programming language (e.g., Python).

• Parse and Format Response: Parse the JSON response from the API and extract the USD value.

Sample Code

Here is a sample code snippet in Python that shows how to retrieve the USD value of ERC-20 tokens transferred using the Etherscan API:

import requests

Set your username, password, and API endpoint URL
username = "your_username"
password = "your_password"
api_url = "

Authenticate with the API
response = requests.post(api_url + "/auth", auth=(username, password))

Extract the token ID from the response
token_id = None 
Replace it with the desired ERC-20 token

Set the search query for the ERC-20 token endpoint
query = f"token={token_id}&symbol={token_id}"

Send a request GET to ERC-20 Token Endpoint
response = requests.get(api_url + "/tokens", params={"q": query})

Parse and format the response
data = response.json()

Extract the USD value from the response
usd_value = data["result"][0]["amount"] / 10000000000
print(f"USD value of {token_id}: {usd_value}")

Best Practices

When using the Etherscan API, keep the following in mind:

• Make sure to replace your username and password with your actual credentials.

• Use a secure method to store your credentials, such as environment variables or a secrets manager.

• Be aware of rate and usage limits when sending multiple requests per second.

By following these steps and guidelines, you can effectively retrieve the USD value of transferred ERC-20 tokens using the Etherscan API. Happy coding!