Carbon DeFi Dev
  • Carbon DeFi
    • Introducing Carbon DeFi
      • What Makes Carbon DeFi Unique?
      • Fees & Payments
      • Resources
    • Security & Audits
  • Contracts & Functions
    • Contracts
      • CarbonController
      • CarbonVortex
      • CarbonVortexBridge
      • Deployments
        • Mainnet Contracts
        • Testnet Contracts
    • CarbonController Functions
      • Write Functions
        • Transaction Prerequisites
          • approve() / allowance()
        • Trade
          • tradeBySourceAmount()
          • tradeByTargetAmount()
        • Strategy Management
          • createStrategy()
          • updateStrategy
          • deleteStrategy()
      • Read Functions
        • controllerType()
        • tradingFeePPM()
        • pairTradingFeePPM()
        • pair()
        • pairs()
        • strategy()
        • strategiesByPair()
        • strategiesByPairCount()
        • calculateTradeSourceAmount()
        • calculateTradeTargetAmount()
      • Data & Events
        • TradingFeePPMUpdated()
        • PairCreated()
        • StrategyCreated()
        • StrategyDeleted()
        • StrategyUpdated()
        • TokensTraded()
        • FeesWithdrawn()
    • CarbonVortex Functions
      • Write Functions
        • trade()
        • execute()
      • Read Functions
        • amountAvailableForTrading()
        • availableTokens()
        • expectedTradeInput()
        • expectedTradeReturn()
        • finalTargetToken()
        • minTargetTokenSaleAmount()
        • minTokenSaleAmount()
        • pairDisabled()
        • priceDecayHalfLife()
        • rewardsPPM()
        • targetToken()
        • targetTokenPriceDecayHalfLife()
        • targetTokenSaleAmount()
        • tokenPrice()
        • totalCollected()
        • tradingEnabled()
    • CarbonVortexBridge Functions
      • Write Functions
        • Bridge()
  • Rest API
    • Carbon DeFi Public REST API
  • Developer Guides
    • Carbon DeFi SDK
      • Getting started
      • Interacting with the SDK
        • Managing Strategies
        • Performing Trades
        • Getting User and Pair Data
        • Collecting Liquidity Data
      • SDK Functions
        • constructor
        • startDataSync
        • getCachedPairs
        • hasLiquidityByPair
        • getLiquidityByPair
        • getUserStrategies
        • getTradeData
        • composeTradeByTargetTransaction
        • composeTradeBySourceTransaction
        • createBuySellStrategy
        • updateStrategy
        • deleteStrategy
        • getMinRateByPair
        • getMaxRateByPair
        • getRateLiquidityDepthByPair
    • The Carbon DeFi versus Uniswap V3 Invariant Functions
    • Carbon DeFi Subgraph
      • Accessing the Subgraph
      • Creating Subgraph Queries
      • Subgraph Query in Python
      • Sample Subgraph Queries
    • Using CarbonVortex
      • CarbonVortex Dynamics
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  1. Contracts & Functions
  2. CarbonController Functions
  3. Write Functions

Transaction Prerequisites

Before interacting with any blockchain smart contract, approval must be granted by the user for use of their tokens.

The options to grant approval include:

  • approve()

  • allowance()

PreviousWrite FunctionsNextapprove() / allowance()

Last updated 6 months ago