notesbytom

Google Public NTP [AS15169]:

time.google.com

time1.google.com

time2.google.com

time3.google.com

How do I retrieve the "COMP earned" value?

With a Smart Contract or JSON RPC

Get the value of COMP earned for an address that uses the Compound protocol. This can be done using the Lens contract with JSON RPC or another Smart Contract. If you do an eth_call with JSON RPC, it is free (no gas costs).

Use the getCompBalanceMetadataExt method in the Lens contract https://etherscan.io/address/0xdCbDb7306c6Ff46f77B349188dC18cEd9DF30299#code
Lens address is posted here https://github.com/compound-finance/compound-protocol/blob/master/networks/mainnet.json#L31
Here is the definition https://github.com/compound-finance/compound-protocol/blob/master/contracts/Lens/CompoundLens.sol#L453

From Blockchain With JSON RPC and JavaScript

const Compound = require('@compound-finance/compound-js');

const provider = 'https://mainnet.infura.io/v3/' + process.env.infuraApiKey;

const cTokenToGetCompApy = Compound.cUSDC; // Pick an asset

const underlying = cTokenToGetCompApy.slice(1, 10);
const underlyingDecimals = Compound.decimals[underlying];

Net APY Calculation

Convert all supplied and borrowed asset amounts to a single asset (like USD or ETH).
Calculate the sum of (suppliedAmount * supplyApyAsDecimal - borrowedAmount * borrowApyAsDecimal) for all underlying assets.
If the calculated sum from the previous step is >0 then Net APY = 100 * (sum / totalSuppliedValue). If the calculation from the previous step is <0 then Net APY = 100 * (sum / totalBorrowedValue). If the calculation from the previous step is 0 then Net APY = 0.

Example

Net APY:

-7.29%

	# Loosely based on http://www.vistax64.com/powershell/202216-display-image-powershell.html

	[void][reflection.assembly]::LoadWithPartialName("System.Windows.Forms")

	$file = (get-item 'C:\Users\Public\Pictures\Sample Pictures\Chrysanthemum.jpg')
	#$file = (get-item "c:\image.jpg")

	$img = [System.Drawing.Image]::Fromfile($file);

	# This tip from http://stackoverflow.com/questions/3358372/windows-forms-look-different-in-powershell-and-powershell-ise-why/3359274#3359274

	#!/usr/bin/env ruby
	#
	# Mac OS X webarchive is a binary format of a plist file. You can extract the contents manually:
	# 1. convert the plist file into XML by "plutil -convert xml1 file.webarchive"
	# 2. parse the resulted XML file by some XML parser
	# 3. decode "WebResourceData" by Base64.decode64(data) in each key
	# 4. save the decoded content into a file indicated by "WebResourceData"
	# Thankfully, the plist library can take care of annoying steps 2 and 3.
	#
	# Preparation:

	const Compound = require('@compound-finance/compound-js');

	const provider = 'https://mainnet.infura.io/v3/' + process.env.infuraApiKey;

	// mainnet
	const CompoundLens = Compound.util.getAddress(Compound.CompoundLens);
	const LensAbi = Compound.util.getAbi(Compound.CompoundLens);
	const COMP = Compound.util.getAddress(Compound.COMP);
	const Comptroller = Compound.util.getAddress(Compound.Comptroller);
	const me = '0xa0df350d2637096571F7A701CBc1C5fdE30dF76A';