Aquarius Documentation
  • Aquarius Loan Documentation
  • Getting Started
    • Networks
    • Protocol Math
      • aToken and Underlying Decimals
      • Interpreting Exchange Rates
      • Calculating Accrued Interest
      • Calculating the APY Using Rate Per Block
    • Gas Costs
  • ATokens
    • Mint
    • Redeem
    • Redeem Underlying
    • Borrow
    • Repay Borrow
    • Repay Borrow Behalf
    • Transfer
    • Liquidate Borrow
    • Key Events
    • Error Codes
    • Failure Info
    • Exchange Rate
    • Get Cash
    • Total Borrow
    • Borrow Balance
    • Borrow Rate
    • Total Supply
    • Underlying Balance
    • Supply Rate
    • Total Reserves
    • Reserve Factor
  • Comptroller
    • Enter Markets
    • Exit Market
    • Get Assets In
    • Collateral Factor
    • Get Account Liquidity
    • Close Factor
    • Liquidation Incentive
    • Key Events
    • Error Codes
    • Failure Info
    • ARS Distribution Speeds
    • Claim ARS
    • Market Metadata
  • Governance
    • Delegate
    • Delegate By Signature
    • Get Current Votes
    • Get Prior Votes
    • Key Events
    • Governor Bravo
    • Quorum Votes
    • Proposal Threshold
    • Proposal Max Operations
    • Voting Delay
    • Voting Period
    • Propose
    • Queue
    • Execute
    • Cancel
    • Get Actions
    • Get Receipt
    • State
    • Cast Vote
    • Cast Vote With Reason
    • Cast Vote By Signature
    • Timelock
    • Pause Guardian
  • Reward Vesting and Staking
    • Reward Vesting
    • ARS Staking
    • Explainer Video
  • LP Staking
    • LP Utility
    • LP Staking Options
    • Zapping LP
    • Maintaining Eligibility Status
    • Explainer Video
  • API
    • ATokenService
      • GET: /atoken
    • MarketHistoryService
      • GET: /market_history/graph
    • ProposalService
      • GET: /proposals
      • GET: /proposals/:id
      • GET: /proposals/statistics
    • VoterService
      • GET: /voters/accounts
      • GET: /voters/accounts/:address
      • GET: /voters/history/:address
      • GET: /voters/:proposalId
    • GovernanceService
      • GET: /governance/aquarius
      • GET: /governance/proposals
      • GET: /governance/proposal_vote_receipts
      • GET: /governance/accounts
    • Shared Data Types
  • Aquarius.js
    • Aquarius Constructor
    • API Methods
      • Account
      • aToken
      • Market History
      • Governance
    • aToken Methods
      • Supply
      • Redeem
      • Borrow
      • Repay Borrow
    • ARS Methods
      • To Checksum Address
      • Get ARS Balance
      • Get ARS Accrued
      • Claim ARS
      • Delegate
      • Delegate By Sig
      • Create Delegate Signature
    • Comptroller Methods
      • Enter Markets
      • Exit Market
    • Ethereum Methods
      • Read
      • Trx
      • Get Balance
    • Governance Methods
      • Cast Vote
      • Cast Vote By Sig
      • Create Vote Signature
    • Price Feed Methods
      • Get Price
    • Utility Methods
      • Get Address
      • Get ABI
      • Get Network Name With Chain ID
  • Security
    • Formal Verification
    • Bug Bounty Program
  • Terms of Service
Powered by GitBook
On this page
  1. ATokens

Exchange Rate

Each aToken is convertible into an ever increasing quantity of the underlying asset, as interest accrues in the market. The exchange rate between a aToken and the underlying asset is equal to:

exchangeRate = (getCash() + totalBorrows() - totalReserves()) / totalSupply()

AErc20 / CEther

function exchangeRateCurrent() returns (uint)
  • RETURN: The current exchange rate as an unsigned integer, scaled by 1e18.

Solidity

AErc20 aToken = AToken(0x3FDA...);
uint exchangeRateMantissa = aToken.exchangeRateCurrent();

Web3 1.0

const aToken = CEther.at(0x3FDB...);
const exchangeRate = (await aToken.methods.exchangeRateCurrent().call()) / 1e18;

Tip: note the use of call vs. send to invoke the function from off-chain without incurring gas costs.

PreviousFailure InfoNextGet Cash

Last updated 1 year ago