Strike Docs
  • 📖Strike Documentation
  • ⭐Getting Started
    • 🧑‍🏫Guides
    • 🔬Networks
    • 📒Protocol Math
      • sToken and Underlying Decimals
      • Interpreting Exchange Rates
      • Calculating Accrued Interest
      • Calculating the APY Using Rate Per Block
    • 💹Gas Costs
  • 🎙️STokens
    • 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
    • STRK Distribution Speeds
    • Claim STRK
    • Market Metadata
  • 👨‍👩‍👦Governance
    • Delegate
    • Delegate By Signature
    • Get Current Votes
    • Get Prior Votes
    • Key Events
    • Governor Alpha
    • Quorum Votes
    • Proposal Threshold
    • Proposal Max Operations
    • Voting Delay
    • Voting Period
    • Propose
    • Queue
    • Execute
    • Cancel
    • Get Actions
    • Get Receipt
    • State
    • Cast Vote
    • Cast Vote By Signature
    • Timelock
    • Pause Guardian
  • 🔡API
    • STokenService
      • GET: /stoken
    • 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/strike
      • GET: /governance/proposals
      • GET: /governance/proposal_vote_receipts
      • GET: /governance/accounts
    • UserHistoryService
      • GET: /user/history
    • LiquidationService
      • GET: /get_liquidators
      • GET: /get_liquidator:account
      • GET: /get_liquidator_detail:account
      • GET: /liquidator
    • Shared Data Types
  • ⌛Strike.js
    • Strike Constructor
    • API Methods
      • Account
      • sToken
      • Market History
      • Governance
    • sToken Methods
      • Supply
      • Redeem
      • Borrow
      • Repay Borrow
    • STRK Methods
      • To Checksum Address
      • Get Strk Balance
      • Get Strk Accrued
      • Claim Strk
      • 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
  • 🤑DeFi 3.0 Vault
  • 🍍Revenue Share Staking
  • 🔒Security
    • Formal Verification
    • Bug Bounty Program
    • Immunefi
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  1. STokens

Exchange Rate

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

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

SErc20 / SEther

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

Solidity

SErc20 sToken = SToken(0x3FDA...);
uint exchangeRateMantissa = sToken.exchangeRateCurrent();

Web3 1.0

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

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

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Last updated 4 years ago

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