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  • About Bancor Network
    • Bancor V3
    • Bancor Basics
      • About Bancor
      • What Can I Do With Bancor?
      • Liquidity Pools
      • Single-Side Liquidity
      • Why Use Bancor?
      • Resources
    • Resources for DAOs
      • Token Whitelisting Requirements
      • Liquidity Mining
        • Auto Compounding Rewards
          • How Auto Compounding Rewards work
          • How to Create an Auto Compounding Rewards Program
          • Custom Rewards Programs
        • Dual Liquidity Mining
        • Standard (External) Rewards
    • Security & Audits
      • Multisig Rights
      • Oracles
      • DAO MSIG Intervention Policy
  • Contracts & Functions
    • Contracts
    • Write Functions
      • Transaction Prerequisites
        • approve() / allowance()
      • Trading
        • tradeBySourceAmount()
        • tradeByTargetAmount()
        • Trading Troubleshooting
      • Adding Liquidity
        • deposit()
        • depositFor()
        • Deposit Troubleshooting
        • depositAndJoin()
      • Removing Liquidity
        • Initiating Cooldown
          • initWithdrawal()
        • withdraw()
        • cancelWithdrawal()
        • Withdraw Troubleshooting
      • Flashloan
        • flashLoan()
        • Flashloan Troubleshooting
      • Migrating Liquidity to v3
        • Migrating Bancor positions to v3
          • migratePositions()
          • migratePoolTokens()
          • Errors and Troubleshooting
        • Migrating from Uniswap v2
          • migrateUniswapV2Position()
        • Migrating from Sushiswap
          • migrateSushiSwapV1Position()
      • Rewards
        • join()
        • stakeRewards()
        • autoProcessRewards()
        • claimRewards()
        • leave()
      • Surplus migration
        • withdrawPOL()
      • Network Fees
        • burnNetworkFees()
    • Read Functions
      • Rewards
        • Standard rewards
          • Identify if a program exists
            • Auto Compounding
            • Standard Rewards
          • programIds()
          • programs()
          • providerProgramIds()
          • pendingRewards()
          • latestProgramId()
          • isProgramActive()
          • isProgramEnabled()
          • providerStake()
          • programStake()
          • providerRewards()
        • Auto compounding rewards
          • bnToken balance
          • isProgramActive()
          • isProgramPaused()
          • pools()
          • program()
          • programs()
      • Liquidity Pool Details
        • liquidityPools()
        • isPoolValid()
        • isPoolStable()
        • tradingLiquidity()
        • depositingEnabled()
        • poolFundingLimit()
      • Trades
        • tradeOutputBySourceAmount()
        • tradeInputByTargetAmount()
        • tradingEnabled()
        • tradingFeePMM()
      • Withdrawals
        • isReadyForWithdrawal()
        • withdrawalRequest()
        • withdrawalAmounts()
        • withdrawalRequestIds()
        • withdrawalRequestCount()
        • lockDuration()
      • Pool Token Information
        • poolToken()
        • collectionByPool()
        • poolTokenToUnderlying()
        • underlyingToPoolToken()
      • Vortex
        • pendingNetworkFeeAmount()
        • minNetworkFeeBurn()
      • Surplus whitelist
        • protectedTokenWhitelist()
    • Data & Events
      • General Data
        • contextId
      • Trading Data
        • event TokensTraded()
      • Liquidity Data
        • TotalLiquidityUpdated()
        • TradingLiquidityUpdated()
        • TokensDeposited()
        • TokensWithdrawn()
        • WithdrawalInitiated()
        • WithdrawalCancelled()
        • WithdrawalCompleted()
        • LockDurationUpdated()
        • Cross AMM Migration Data
          • UniswapV2PositionMigrated()
          • SushiswapV1PositionMigrated()
      • Flashloan Data
        • FlashLoanCompleted()
        • FlashLoanFeePPMUpdated()
      • Rewards
        • Staking and Unstaking
          • Event ProviderJoined()
          • Event ProviderLeft()
        • Claiming and Restaking Rewards
          • Event RewardsClaimed()
          • Event RewardsStaked()
  • Developer Guides
    • Bancor Vortex Burner
    • Bancor Etherscan Guide
      • Etherscan Basics
      • Deposit
      • Deposit and Join
      • Rewards: Joining Standard Rewards
      • Rewards: Stake & Claim
      • Rewards: Leaving the Rewards Contract
      • Withdrawing Tokens
        • Initiating the Withdrawal
        • Completing the Withdrawal
      • Migrating V2.1 Positions
      • Rewards: Auto Compounding Rewards Distribution
    • REST API
      • API Reference
      • DLT Identifier
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On this page
  1. Contracts & Functions
  2. Data & Events

General Data

Using data to trigger events from a smart contract

Events are triggered to communicate between smart contract transactions and user interfaces.

By connecting DApps to Ethereum JSON-RPC API, you can listen to events to trigger specific actions. Events can be used in different ways:

  1. Returning values for a user interface

  2. Asynchronous triggers with data

  3. A cheaper form of storage

The information is communicated from a smart contract event to a user interface via logs. Logs are helpful for debugging smart contracts and for making analytics dashboards.

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Last updated 3 years ago