Compound USDT change proposal

_charts.ipynb

after.json

{"pct": [100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89, 88, 87, 86, 85, 84, 83, 82, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0], "supply": [147831050226, 139906249997, 132111681885, 124447345887, 116913242007, 109509370240, 102235730591, 95092323057, 88079147638, 81196204336, 74443493148, 67821014077, 61328767121, 54966752281, 48734969556, 42633418947, 36662100454, 30821014077, 25110159815, 19529537669, 14079147639, 13729368814, 13383989724, 13043010367, 12706430744, 12374250854, 12046470698, 11723090276, 11404109587, 11089528632, 10779347410, 10473565923, 10172184169, 9875202148, 9582619861, 9294437308, 9010654488, 8731271402, 8456288050, 8185704432, 7919520547, 7657736395, 7400351977, 7147367293, 6898782343, 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before.json

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new_rate.py

# 1. Set your WEB3_INFURA_PROJECT_ID and ETHERSCAN_TOKEN environment varibles
# 2. Save this as a brownie script named new_rate.py
# 3. brownie run new_rate main --network mainnet-fork

from brownie import *
import math
import json

cusdt = Contract.from_explorer("0xf650C3d88D12dB855b8bf7D11Be6C55A4e07dCC9")
rates = Contract.from_explorer("0xfb564da37b41b2f6b6edcc3e56fbf523bd9f2012")

blocksPerYear = rates.blocksPerYear()
baseRatePerBlock = rates.baseRatePerBlock()
multiplierPerBlock = rates.multiplierPerBlock()
kink = rates.kink()
jumpMultiplierPerBlock = rates.jumpMultiplierPerBlock()
reserveFactorMantissa = cusdt.reserveFactorMantissa()
owner = rates.owner()

def apy(r):
    n = blocksPerYear
    r = r * blocksPerYear / 1e18
    return math.pow((1 + r/n ),n) - 1

def write_usage_rates(name):
    pct = []
    borrow = []
    supply = []
    borrow_apy = []
    supply_apy = []
    for i in range(0,101):
        pct.append(100-i)
        br = rates.getBorrowRate(i*1e32, (100-i)*1e32, 0)
        sr = rates.getSupplyRate(i*1e32, (100-i)*1e32, 0, reserveFactorMantissa)
        borrow.append(br)
        supply.append(sr)
        borrow_apy.append(apy(br))
        supply_apy.append(apy(sr))
    
    with(open(name, "w") as f):
        j = json.dumps({
            "pct":pct,
            "supply":supply,
            "borrow":borrow,
            "borrow_apy":borrow_apy,
            "supply_apy":supply_apy
            })
        f.write(j)
        print("100%% utilization rate: %f" % borrow_apy[0])

def try_jump_rate(jumpMultiplierPerYear):
    """Use exsisting deployed parameters except for jumpMultiplierPerYear."""
    rates.updateJumpRateModel(
        0,
        "0x000000000000000000000000000000000000000000000000008e1bc9bf040000",
        jumpMultiplierPerYear,
        "0x0000000000000000000000000000000000000000000000000b1a2bc2ec500000",
        {"from":owner}
    )
    br = rates.getBorrowRate(0*1e32, 100*1e32, 0)
    return apy(br)


def main():
    print("Rate before")
    write_usage_rates("before.json")

    print("Change to new rate")
    # Old value: 1090000000000000000
    print(try_jump_rate(1480000000000000000))

    print("Rate after")
    write_usage_rates("after.json")