Python
使用 Python 腳本在 AAVE 上檢索 Matic 獎勵率
我正在嘗試建構一個 Python 腳本，以在 Polygon 區塊鏈上以程式方式檢索不同的 AAVE 費率（借款、貸款和獎勵）（對於乙太坊來說將非常相似）。我正在使用 Python。
到目前為止，我設法檢索了 AAVE 上可用貨幣（DAI、USDC、MATIC、WETH、WBTC、USDT）的借貸利率。請參閱下面的程式碼。我還想自動檢索 WMATIC APR 獎勵費率。我還沒有找到辦法做到這一點。有人知道該怎麼做嗎？
為了清楚起見，我的意思是檢索此處突出顯示的數字：
在以下連結https://docs.aave.com/developers/guides/apy-and-apr中，他們提供了一種計算“percentDepositAPR”和“percentBorrowAPR”的方法，但是當我實現它時它給出了明顯錯誤的值，並且所以我認為這與其他事情有關，而不是 MATIC 代幣獎勵分配。
這裡還有有趣的資訊：
Polygon 分兩個階段發放 MATIC 獎勵：從今天到 6 月 14 日，佔總供應量的 0.5%，在 2022 年 6 月 14 日至 4 月 13 日期間再發放 0.5%。
但這還不足以計算獎勵率。
提前致謝。
import json import requests import urllib3 from gql import gql, Client from gql.transport.requests import RequestsHTTPTransport token_ticker = 'USDC' reward_token_ticker = 'WMATIC' URL_API = 'https://api.thegraph.com/subgraphs/name/aave/aave-v2-matic' query = gql(''' query { reserves (where: { usageAsCollateralEnabled: true }) { id name price { id priceInEth } liquidityRate variableBorrowRate stableBorrowRate aEmissionPerSecond vEmissionPerSecond decimals totalATokenSupply totalCurrentVariableDebt symbol } } ''') sample_transport=RequestsHTTPTransport( url=URL_API, verify=True, retries=3, ) client = Client( transport=sample_transport ) response = client.execute(query) for token in response['reserves']: if token_ticker in token['symbol']: variableBorrowRate = float(token['variableBorrowRate']) liquidityRate = float(token['liquidityRate']) TOKEN_DECIMALS = float(token['decimals']) TOKEN_PRICE_ETH = float(token['price']['priceInEth'])/10.0**18 aEmissionPerSecond = float(token['aEmissionPerSecond']) vEmissionPerSecond = float(token['vEmissionPerSecond']) totalCurrentVariableDebt = float(token['totalCurrentVariableDebt']) totalATokenSupply = float(token['totalATokenSupply']) if reward_token_ticker in token['symbol']: REWARD_PRICE_ETH = float(token['price']['priceInEth'])/10.0**18 REWARD_DECIMALS = float(token['decimals']) RAY = 10.0**27 WAD = 10.0**18 SECONDS_PER_YEAR = 31556926.0 # deposit and borrow calculation percentDepositAPY = 100.0 * liquidityRate/RAY percentVariableBorrowAPY = 100.0 * variableBorrowRate/RAY percentStableBorrowAPY = 100.0 * variableBorrowRate/RAY print(f"{token_ticker} deposit APY: {percentDepositAPY:.2f}%") print(f"{token_ticker} borrow APY: {percentVariableBorrowAPY:.2f}%")**編輯：**下面是嘗試計算 WMATIC 獎勵 APR。但結果值與 AAVE 網站不一致，除了 WMATIC 作為 token_ticker。當我將 WMATIC 設置為主要代幣和獎勵時，我得到了我需要的值。但我仍然無法得到它的其餘部分：USDC、DAI 等……
percentDepositAPR = 100 * (aEmissionPerSecond*SECONDS_PER_YEAR * REWARD_PRICE_ETH * TOKEN_DECIMALS) / (totalATokenSupply * TOKEN_PRICE_ETH * REWARD_DECIMALS) print(f"{percentDepositAPR:.2f}") percentBorrowAPR = 100 * (vEmissionPerSecond*SECONDS_PER_YEAR * REWARD_PRICE_ETH * TOKEN_DECIMALS) / (totalCurrentVariableDebt * TOKEN_PRICE_ETH * REWARD_DECIMALS) print(f"{percentBorrowAPR:.2f}")
所以我解決了這個問題。有兩個錯誤：
- 對於“REWARD_DECIMAL”和“TOKEN_DECIMAL”，我應該使用 10 的數字次方，而不是數字本身。
- 由於某種原因，從呼叫 API api.thegraph.com 中檢索到的 ETH 價格是錯誤的。所以我通過呼叫 Binance API 來獲取 ETH 的價格。
Bellow 是給出正確結果的 Python 程式碼：
import json import requests import urllib3 from gql import gql, Client from gql.transport.requests import RequestsHTTPTransport token_ticker = 'USDC' reward_token_ticker = 'WMATIC' RAY = 10.0**27 WAD = 10.0**18 SECONDS_PER_YEAR = 31556926.0 ################################################# def get_token_price_in_eth(token_ticker): if token_ticker!='USDT': while True: r = requests.get( f'https://api.binance.com/api/v3/ticker/price?symbol={token_ticker}USDT') if r.status_code == 200: break data = r.json() token_in_usdt= float(data['price']) else: token_in_usdt = 1.0 while True: r = requests.get( 'https://api.binance.com/api/v3/ticker/price?symbol=ETHUSDT') if r.status_code == 200: break data = r.json() eth_in_usdt= float(data['price']) return token_in_usdt/eth_in_usdt ################################################# URL_API = 'https://api.thegraph.com/subgraphs/name/aave/aave-v2-matic' query = gql(''' query { reserves (where: { usageAsCollateralEnabled: true }) { id name price { id priceInEth } liquidityRate variableBorrowRate stableBorrowRate aEmissionPerSecond vEmissionPerSecond decimals totalATokenSupply totalCurrentVariableDebt symbol } } ''') sample_transport=RequestsHTTPTransport( url=URL_API, verify=True, retries=3, ) client = Client( transport=sample_transport ) response = client.execute(query) for token in response['reserves']: if token_ticker in token['symbol']: variableBorrowRate = float(token['variableBorrowRate']) liquidityRate = float(token['liquidityRate']) TOKEN_DECIMALS = 10**float(token['decimals']) aEmissionPerSecond = float(token['aEmissionPerSecond']) vEmissionPerSecond = float(token['vEmissionPerSecond']) totalCurrentVariableDebt = float(token['totalCurrentVariableDebt']) totalATokenSupply = float(token['totalATokenSupply']) if reward_token_ticker in token['symbol']: REWARD_DECIMALS = 10**float(token['decimals']) REWARD_PRICE_ETH = get_token_price_in_eth('MATIC') TOKEN_PRICE_ETH = get_token_price_in_eth(token_ticker.replace('W', '')) # deposit and borrow calculation percentDepositAPY = 100.0 * liquidityRate/RAY percentVariableBorrowAPY = 100.0 * variableBorrowRate/RAY percentStableBorrowAPY = 100.0 * variableBorrowRate/RAY print(f"{token_ticker} deposit APY: {percentDepositAPY:.2f}%") print(f"{token_ticker} borrow APY: {percentVariableBorrowAPY:.2f}%") percentDepositAPR = 100 * (aEmissionPerSecond*SECONDS_PER_YEAR * REWARD_PRICE_ETH * TOKEN_DECIMALS) / (totalATokenSupply * TOKEN_PRICE_ETH * REWARD_DECIMALS) percentBorrowAPR = 100 * (vEmissionPerSecond*SECONDS_PER_YEAR * REWARD_PRICE_ETH * TOKEN_DECIMALS) / (totalCurrentVariableDebt * TOKEN_PRICE_ETH * REWARD_DECIMALS) print(f"{token_ticker} WMATIC reward deposit APR: {percentDepositAPR:.2f}%") print(f"{token_ticker} WMATIC reward borrow APR: {percentBorrowAPR:.2f}%")它給出了以下結果（2021 年 9 月 12 日 @ 21:05 UTC）：
USDC deposit APY: 3.18% USDC borrow APY: 3.96% USDC WMATIC reward deposit APR: 1.60% USDC WMATIC reward borrow APR: 2.71%這與 AAVE 應用程序網站上給出的內容足夠接近：
