Quipuswap
  • introduction
    • What is QuipuSwap?
    • Participants
    • QuipuSwap subprojects
      • QuipuSwap Farms
      • Quipuswap Stable DEX
      • Token to Token Swaps
      • Governance (text-only)
  • Get Started
    • Install Wallet
    • How to get TEZ
    • How to find my tokens
    • Connect wallet
    • FAQ
  • Dex Guides
    • Overview
    • Types of the exchange (Token/TEZ, Token/Token)
    • How to use the DEX
      • Trade
      • How to add liquidity to an existing liquidity pool
      • How to create a new liquidity pool
      • How to remove liquidity
      • How to vote for a baker
      • How to ban/veto a baker
  • Tezos Tokens
    • What is a Token?
    • What is the difference between FA1.2 and FA2 standards?
    • QUIPU Tokenomics
  • Smart Contracts
    • Dex token edition
      • Overview
      • Dex
      • Exceptions
    • QuipuSwap stable swap DEX
      • ๐Ÿ› ๏ธDeveloper module
        • ๐Ÿ“„Storage & action types
        • ๐Ÿ”ตDeveloper setter entrypoints
          • set_dev_address
          • set_dev_fee
      • ๐Ÿ Standalone DEX
        • ๐Ÿ“„Storage and types overview
        • ๐ŸŸกInitialization
          • set_admin_function
          • set_dev_function
          • set_dex_function
          • set_token_function
        • ๐ŸŸ Add new dex
          • add_pool
        • ๐Ÿ”ตDEX methods
          • invest
          • swap
          • ๐Ÿ“คDivesting
            • divest
            • divest_imbalanced
            • divest_one_coin
          • ๐Ÿค‘DEX rewards
            • claim_referral
            • stake
        • ๐Ÿ› ๏ธDeveloper methods
          • claim_developer
          • Dev module entrypoints
        • ๐Ÿ›‘Admin methods
          • add_rem_managers
          • ramp_A
          • set_admin
          • set_fees
          • stop_ramp_A
      • ๐ŸญFactory
        • ๐Ÿ“„Storage and types overview
        • ๐ŸŸกInitial setup
          • set_init_function
          • set_dev_function
          • DEX compiled codebase setup
            • set_admin_function
            • set_dex_function
            • set_token_function
        • ๐ŸŸ Initialize new DEX flow
          • add_pool
          • start_dex
        • ๐Ÿ’ฑDeployed from factory DEX
          • ๐Ÿ“„Storage and types overview
          • ๐ŸŸกInitialization
            • copy_dex_function
            • freeze
          • ๐Ÿ”ตDEX methods
          • ๐Ÿ› ๏ธClaim developer rewards
          • ๐Ÿ›‘Admin methods
        • ๐Ÿ›‘Developer methods
          • claim_rewards
          • ๐Ÿง‘โ€๐Ÿ’ปFactory management
            • ๐ŸŸขFactory params
              • set_burn_rate
              • set_price
              • set_whitelist
            • ๐Ÿ”ตDev module entrypoints
    • Dex 2.0
      • โ‰๏ธErrors overview
      • ๐ŸฅBakerRegistry contract
        • Storage and types overview
        • Entrypoints overview
          • validate
          • register
      • โš™๏ธFlashSwapsProxy contract
        • Storage and types overview
        • Entrypoints overview
          • default
      • ๐ŸงบBucket contract
        • Storage and types overview
        • Entrypoints overview
          • fill
          • pour_out
          • pour_over
          • withdraw_rewards
          • ban_baker
          • vote
          • default
        • On-chain views overview
          • is_banned_baker
          • get_tez_balance
          • get_user_candidate
      • โš–๏ธAuction contract
        • Storage and types overview
        • Entrypoints overview
          • Auction entrypoints
            • receive_fee
            • launch_auction
            • place_bid
            • claim
          • Admin entrypoints
            • set_admin
            • confirm_admin
            • set_baker
            • set_fees
            • set_auction_duration
            • set_min_bid
            • update_whitelist
            • withdraw_dev_fee
            • withdraw_public_fee
            • burn_bid_fee
      • ๐ŸฆDexCore contract
        • Storage and types overview
        • Entrypoints overview
          • DEX entrypoints
            • launch_exchange
            • invest_liquidity
            • divest_liquidity
            • swap
            • withdraw_profit
            • claim_interface_fee
            • claim_interface_tez_fee
            • withdraw_auction_fee
            • vote
          • Admin entrypoints
            • set_admin
            • confirm_admin
            • set_flash_swaps_proxy
            • set_auction
            • add_managers
            • set_fees
            • set_collecting_period
            • update_token_metadata
            • ban
          • Permits' entrypoints
            • permit
            • set_expiry
          • FA2 entrypoints
            • transfer
            • update_operators
            • balance_of
          • Callbacks
            • launch_callback
            • flash_swap_callback
            • close
        • On-chain views overview
          • check_is_banned_baker
          • get_reserves
          • get_total_supply
          • get_swap_min_res
          • get_toks_per_share
          • get_cumulative_prices
          • get_collecting_period
    • Trusted contracts
    • Farming
      • Referral system overview
      • Fees overview
      • Rewards precision overview
      • BakerRegistry contract
        • Storage and types overview
        • Entrypoints overview
          • validate
          • register
      • Burner contract
        • Storage and types overview
        • Entrypoints overview
          • default
          • burn_callback
      • ProxyMinter contract
        • Storage and types overview
        • Entrypoints overview
          • Admin entrypoints
            • add_minter
            • withdraw_tokens
            • set_admin
            • confirm_admin
          • Minter entrypoint
            • mint_tokens
      • QFarm contract
        • Storage and types overview
        • Entrypoints overview
          • Farming entrypoints
            • deposit
            • withdraw
            • harvest
          • FA2 entrypoints
            • transfer
            • update_operators
            • balance_of
          • Admin entrypoints
            • set_admin
            • confirm_admin
            • set_fees
            • set_reward_per_second
            • set_burner
            • set_proxy_minter
            • set_baker_registry
            • set_is_v1_lp
            • ban_bakers
            • add_new_farm
            • pause_farms
            • burn_tez_rewards
            • withdraw_farm_depo
            • update_token_metadata
          • Other entrypoints
            • burn_farm_rewards
            • default
      • TFarm contract
        • Storage and types overview
        • Entrypoints overview
          • Farming entrypoints
            • deposit
            • withdraw
            • harvest
          • FA2 entrypoints
            • transfer
            • update_operators
            • balance_of
          • Admin entrypoints
            • set_admin
            • confirm_admin
            • set_fees
            • set_reward_per_second
            • set_burner
            • set_baker_registry
            • set_is_v1_lp
            • ban_bakers
            • add_new_farm
            • pause_farms
            • burn_tez_rewards
            • claim_farm_rewards
            • withdraw_farm_depo
            • update_token_metadata
          • Other entrypoints
            • default
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On this page
  • Call parameters
  • Usage
  • Errors
  1. Smart Contracts
  2. Dex 2.0
  3. DexCore contract
  4. Entrypoints overview
  5. Callbacks

flash_swap_callback

Previouslaunch_callbackNextclose

Last updated 3 years ago

An entrypoint that executes after execution of user's lambda but only in case when user is trying to loan TEZ tokens. It checks the returns of TEZ tokens and it to the appropriative contract.

When user need to return TEZ tokens, he need to transfer correct amount of TEZ tokens to the contract at the end of his lambda execution.

Call parameters

type token_id_t         is nat

type flash_swap_1_t     is [@layout:comb] record [
  pair_id                 : token_id_t;
  prev_tez_balance        : nat;
  amount_in               : nat;
]
Field
Type
Description

pair_id

token_id_t (nat)

Identifier of the liquidity pool (pair)

prev_tez_balance

nat

amount_in

nat

The number of incoming tokens (amount that user must repay)

Usage

Only contract can call this entrypoint.

Errors

  • 108 - pair (pool) with the specified token_id not listed.

  • 113 - a contract not found (not TOK/TEZ LP pair).

  • 129 - wrong amount of flash swap returns.

  • 138 - only entered (transaction must be not the first transaction in the chain of calls).

  • 403 - sender of the transaction is not contract.

  • 412 - non payable entrypoint (can't accept TEZ tokens during call of an entrypoint).

TEZ balance of contract before execution of user's lambda

๐Ÿฆ
fills
Bucket
DexCore
DexCore
Bucket
DexCore
DexCore