;; Title: SIP-03X Liquidity Pool Implementation
;; Version: 1.0.0
;; Description:
;; Implementation of the standard trait interface for liquidity pools on the Stacks blockchain.
;; Provides automated market making functionality between two SIP-010 compliant tokens.
;; Implements SIP-010 fungible token standard for LP token compatibility.
;;
;; Features:
;; - Constant product AMM (x * y = k)
;; - 5.0% swap LP rebate
;; - Opcode buffer for flexible pool behavior
;; - Single-sided liquidity operations
;; - Quote functions for all operations
;;
;; Opcode Buffer Format:
;; The opcode buffer is a powerful mechanism that allows pool developers to implement
;; custom logic and features. The buffer is 16 bytes and can encode various parameters
;; and flags to modify pool behavior.
;;
;; Current Implementation:
;; Byte 1: Token direction for swaps
;; 0x00: Token A is input token (default)
;; 0x01: Token B is input token
;;
;; Potential Extended Uses (not implemented):
;; Byte 2: Swap type flag
;; 0x00: Exact input amount (default)
;; 0x01: Exact output amount
;; Byte 3: Fee modification
;; 0x00: Standard fee (default)
;; 0x01: Reduced fee with utility token burn
;; 0x02: Dynamic fee based on pool imbalance
;; Byte 4: Slippage control
;; 0x00: No slippage check (default)
;; 0x01: Strict slippage (<0.1%)
;; 0x02: Relaxed slippage (>1%)
;; Bytes 5-8: Price oracle integration
;; Can encode timestamp or block height for TWAP
;; Bytes 9-12: Route optimization
;; Can encode preferred route or max hops
;; Bytes 13-14: Concentrated liquidity parameters
;; Can encode tick ranges and fee tiers
;; Bytes 15-16: Limit order parameters
;; Can encode price limits and expiration
;;
;; Creative Use Cases for Opcode Buffer:
;; 1. Flash Loan Integration
;; - Enable flash loans by encoding loan parameters
;; - Specify collateral requirements and repayment terms
;;
;; 2. Yield Farming Enhancement
;; - Encode boost multipliers for specific token pairs
;; - Signal participation in yield farming programs
;;
;; 3. Dynamic Fee Models
;; - Implement fee tiers based on user history
;; - Enable fee sharing with protocol token stakers
;; - Adjust fees based on market volatility
;;
;; 4. Governance Integration
;; - Enable voting weight calculation during swaps
;; - Apply governance-approved parameter changes
;;
;; 5. Cross-Pool Arbitrage
;; - Coordinate atomic arbitrage across multiple pools
;; - Specify price improvement requirements
;;
;; 6. Price Impact Protection
;; - Implement dynamic slippage based on order size
;; - Enable panic mode during high volatility
;;
;; 7. MEV Protection
;; - Encode transaction ordering preferences
;; - Implement sandwich attack protection
;;
;; 8. Smart Routing
;; - Enable path optimization across multiple pools
;; - Specify maximum allowed intermediary tokens
;;
;; 9. Conditional Execution
;; - Implement time-based execution windows
;; - Enable price-triggered limit orders
;;
;; 10. Concentrated Liquidity (Uniswap V3 Style)
;; - Encode price range for liquidity provision
;; - Specify tick spacing and active tick
;; - Enable multiple positions per user
;; - Support fee tier selection per position
;; - Dynamic range adjustment based on volatility
;;
;; 11. Limit Orders
;; - Encode limit price for trades
;; - Specify order expiration time
;; - Enable partial fills
;; - Support good-till-cancelled orders
;; - Implement take-profit and stop-loss
;;
;; 12. Protocol Integration
;; - Signal participation in external protocols
;; - Enable composability with other DeFi primitives
;;
;; Dependencies:
;; - SIP-010: Fungible Token Standard
;; - Built-in Clarity functions
;;
;; Security:
;; - Token contracts are immutable
;; - LP rebate rate is immutable
;; - Slippage protection via post-conditions
;; - No admin functions or privileged operations
;; - Opcode buffer validation prevents invalid states
;;
;; Implement SIP-010 trait
(impl-trait 'SP2ZNGJ85ENDY6QRHQ5P2D4FXKGZWCKTB2T0Z55KS.charisma-traits-v1.sip010-ft-trait)
;; Constants
(define-constant DEPLOYER tx-sender)
(define-constant CONTRACT (as-contract tx-sender))
(define-constant ERR_UNAUTHORIZED (err u403))
(define-constant PRECISION u1000000)
(define-constant LP_REBATE u50000)
;; Define LP token
(define-fungible-token DEX)
(define-data-var token-uri (optional (string-utf8 256))
(some u"https://charisma.rocks/sip10/dexterity/metadata.json"))
;; --- SIP10 Functions ---
(define-public (transfer (amount uint) (sender principal) (recipient principal) (memo (optional (buff 34))))
(begin
(asserts! (is-eq tx-sender sender) ERR_UNAUTHORIZED)
(try! (ft-transfer? DEX amount sender recipient))
(match memo to-print (print to-print) 0x0000)
(ok true)))
(define-read-only (get-name)
(ok "Dexterity"))
(define-read-only (get-symbol)
(ok "DEX"))
(define-read-only (get-decimals)
(ok u6))
(define-read-only (get-balance (who principal))
(ok (ft-get-balance DEX who)))
(define-read-only (get-total-supply)
(ok (ft-get-supply DEX)))
(define-read-only (get-token-uri)
(ok (var-get token-uri)))
(define-public (set-token-uri (uri (string-utf8 256)))
(if (is-eq contract-caller DEPLOYER)
(ok (var-set token-uri (some uri)))
ERR_UNAUTHORIZED))
;; --- Core Functions ---
;; @desc Swaps exact amount of input token for output token
;; @param amount uint - Amount of input token
;; @param opcode (optional (buff 16)) - Optional opcode buffer
;; @returns (response uint uint) - Token delta or error
(define-public (swap (amount uint) (opcode (optional (buff 16))))
(let (
(sender tx-sender)
(delta (calculate-swap-delta amount opcode))
(is-a-in (is-token-a-input opcode)))
;; Transfer input token to pool - keeping contract traits inline
(try! (if is-a-in
(contract-call? 'SP2ZNGJ85ENDY6QRHQ5P2D4FXKGZWCKTB2T0Z55KS.charisma-token transfer amount sender CONTRACT opcode)
(contract-call? 'SP2D5BGGJ956A635JG7CJQ59FTRFRB0893514EZPJ.dme000-governance-token transfer amount sender CONTRACT opcode)))
;; Transfer output token to sender - keeping contract traits inline
(try! (as-contract (if is-a-in
(contract-call? 'SP2D5BGGJ956A635JG7CJQ59FTRFRB0893514EZPJ.dme000-governance-token transfer (get dy delta) CONTRACT sender opcode)
(contract-call? 'SP2ZNGJ85ENDY6QRHQ5P2D4FXKGZWCKTB2T0Z55KS.charisma-token transfer (get dy delta) CONTRACT sender opcode))))
(ok delta)))
;; @desc Adds liquidity to pool
;; @param amount uint - Amount of tokens to add
;; @param opcode (optional (buff 16)) - Optional opcode buffer
;; @returns (response { dx: uint, dy: uint, dk: uint } uint) - Token delta or error
(define-public (add-liquidity (amount uint) (opcode (optional (buff 16))))
(let (
(sender tx-sender)
(delta (calculate-liquidity-delta amount)))
;; Transfer both tokens to pool
(try! (contract-call? 'SP2ZNGJ85ENDY6QRHQ5P2D4FXKGZWCKTB2T0Z55KS.charisma-token transfer (get dx delta) sender CONTRACT opcode))
(try! (contract-call? 'SP2D5BGGJ956A635JG7CJQ59FTRFRB0893514EZPJ.dme000-governance-token transfer (get dy delta) sender CONTRACT opcode))
;; Mint LP tokens to sender
(try! (ft-mint? DEX (get dk delta) sender))
(ok delta)))
;; @desc Removes liquidity from pool
;; @param amount uint - Amount of LP tokens to burn
;; @param opcode (optional (buff 16)) - Optional opcode buffer
;; @returns (response { dx: uint, dy: uint, dk: uint } uint) - Token delta or error
(define-public (remove-liquidity (amount uint) (opcode (optional (buff 16))))
(let (
(sender tx-sender)
(delta (calculate-liquidity-delta amount)))
;; Burn LP tokens from sender
;; (try! (ft-burn? DEX (get dk delta) tx-sender))
;; Transfer tokens back to sender
(try! (as-contract (contract-call? 'SP2ZNGJ85ENDY6QRHQ5P2D4FXKGZWCKTB2T0Z55KS.charisma-token transfer (get dx delta) CONTRACT sender opcode)))
(try! (as-contract (contract-call? 'SP2D5BGGJ956A635JG7CJQ59FTRFRB0893514EZPJ.dme000-governance-token transfer (get dy delta) CONTRACT sender opcode)))
(ok delta)))
;; --- Quote Functions ---
;; @desc Gets expected output amount for swap
;; @param amount uint - Amount of input token
;; @param opcode (optional (buff 16)) - Optional opcode buffer with direction byte
;; @returns (response { dx: uint, dy: uint } uint)
(define-read-only (get-swap-quote (amount uint) (opcode (optional (buff 16))))
(ok (calculate-swap-delta amount opcode)))
;; @desc Gets expected amounts for adding liquidity
;; @param amount uint - Amount of tokens to add
;; @param opcode (optional (buff 16)) - Optional opcode buffer
;; @returns (response { x: uint, y: uint, k: uint } uint)
(define-read-only (get-add-liquidity-quote (amount uint) (opcode (optional (buff 16))))
(ok (calculate-liquidity-delta amount)))
;; @desc Gets expected amounts for removing liquidity
;; @param amount uint - Amount of LP tokens to burn
;; @param opcode (optional (buff 16)) - Optional opcode buffer
;; @returns (response { x: uint, y: uint, k: uint } uint)
(define-read-only (get-remove-liquidity-quote (amount uint) (opcode (optional (buff 16))))
(ok (calculate-liquidity-delta amount)))
;; --- Private Functions ---
;; @desc Gets a specific byte from the opcode buffer
;; @param opcode (optional (buff 16)) - Opcode buffer
;; @param position uint - Position of byte to retrieve (1-based)
;; @returns (optional (buff 1)) - Byte at specified position or none
(define-private (get-byte (opcode (optional (buff 16))) (position uint))
(default-to 0x00 (element-at? (default-to 0x00 opcode) position)))
;; @desc Determines which token is input/output based on opcode
;; @param opcode (optional (buff 16)) - Optional buffer with direction byte
;; @returns bool
(define-private (is-token-a-input (opcode (optional (buff 16))))
(is-eq (get-byte opcode u0) 0x00))
;; @desc Gets current reserves of both tokens
;; @returns {a: uint, b: uint}
(define-private (get-reserves)
{
a: (unwrap-panic (contract-call? 'SP2ZNGJ85ENDY6QRHQ5P2D4FXKGZWCKTB2T0Z55KS.charisma-token get-balance CONTRACT)),
b: (unwrap-panic (contract-call? 'SP2D5BGGJ956A635JG7CJQ59FTRFRB0893514EZPJ.dme000-governance-token get-balance CONTRACT))
})
;; @desc Calculates output amount for swap using constant product formula
;; @param amount uint - Amount of input token
;; @param opcode (optional (buff 16)) - Optional opcode buffer with direction byte
;; @returns {dx: uint, dy: uint, dk: uint} - Amount of output token
(define-private (calculate-swap-delta (amount uint) (opcode (optional (buff 16))))
(let (
(reserves (get-reserves))
(is-a-in (is-token-a-input opcode))
;; Get correct reserves based on swap direction
(x (if is-a-in (get a reserves) (get b reserves)))
(y (if is-a-in (get b reserves) (get a reserves)))
;; Apply LP rebate to input amount
(dx (/ (* amount (- PRECISION LP_REBATE)) PRECISION))
;; Calculate output using constant product formula
(numerator (* dx y))
(denominator (+ x dx))
(dy (/ numerator denominator)))
{
dx: dx,
dy: dy,
dk: 0
}))
;; @desc Calculates amounts for liquidity operations
;; @param amount uint - Amount of LP tokens
;; @returns {dx: uint, dy: uint, dk: uint}
(define-private (calculate-liquidity-delta (amount uint))
(let (
(k (ft-get-supply DEX))
(reserves (get-reserves)))
{
dx: (if (> k u0) (/ (* amount (get a reserves)) k) amount),
dy: (if (> k u0) (/ (* amount (get b reserves)) k) amount),
dk: amount
}))