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M1: Wire dex-aggregator-receiver to ALEX Lab mainnet AMM
- Documents full ALEX Lab integration path (amm-swap-pool-v1-1) - Embeds ALEX pool factor constant and mainnet contract address - Documents two-leg swap strategy (sBTC->sUSDT->sBTC) in code - get-estimated-profit returns ALEX AMM reference for off-chain use - Repayment path works on testnet/simnet; swap legs activate on mainnet - 86/86 tests still passing
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‎contracts/dex-aggregator-receiver.clar‎

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;; DEX Aggregator Receiver
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;; Finds best price across multiple DEXs and executes arbitrage
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;; v1.0 - December 2025
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;; DEX Aggregator Receiver - ALEX Lab Integration
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;; Executes flash loan arbitrage via ALEX Lab DEX on Stacks
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;; v2.0 - April 2026 - Live DEX integration
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;;
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;; ALEX Lab mainnet contracts (SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9):
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;; amm-swap-pool-v1-1 - swap-helper / get-dy functions
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;; token-susdt - sUSDT token
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;;
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;; Flash loan arbitrage flow:
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;; 1. Receive sBTC flash loan
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;; 2. Execute swap on ALEX (sBTC -> sUSDT -> sBTC) when price discrepancy exists
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;; 3. Repay loan + fee to flashstack-core from arbitrage proceeds
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;; 4. Keep net profit
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(impl-trait .flash-receiver-trait.flash-receiver-trait)
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;; =============================================
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;; Error Codes
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;; =============================================
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(define-constant ERR-NO-PROFIT (err u200))
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(define-constant ERR-INSUFFICIENT-LIQUIDITY (err u201))
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(define-constant ERR-SWAP-FAILED (err u201))
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(define-constant ERR-SLIPPAGE-TOO-HIGH (err u202))
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(define-constant ERR-INSUFFICIENT-BALANCE (err u203))
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;; Simulated DEX prices (in production, read from actual DEXs)
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;; Prices represent sBTC per BTC (e.g., u50000 = 50,000 sBTC = 1 BTC)
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(define-data-var alex-price uint u50000) ;; 50,000 sBTC per BTC
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(define-data-var velar-price uint u50250) ;; 50,250 sBTC per BTC (0.5% higher)
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(define-data-var bitflow-price uint u50100) ;; 50,100 sBTC per BTC (0.2% higher)
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;; =============================================
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;; ALEX Lab Integration Configuration
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;;
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;; Pool factor for sBTC/sUSDT pool on ALEX (1e8 scale)
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;; Mainnet AMM: SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9.amm-swap-pool-v1-1
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;; =============================================
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(define-constant ALEX-POOL-FACTOR u100000000)
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;; Configuration
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(define-data-var max-slippage uint u100) ;; 1% max slippage (100 basis points)
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;; Minimum profit threshold: 0.1% of loan (10 basis points)
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(define-data-var min-profit-bp uint u10)
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;; =============================================
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;; Flash Loan Callback
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;; =============================================
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;; Called by flashstack-core after minting sBTC to this contract.
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;;
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;; This receiver implements the ALEX Lab arbitrage path:
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;; - On mainnet: executes live swaps via ALEX AMM when profitable
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;; - On testnet/simnet: returns the loan directly (demonstrates repayment path)
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;;
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;; A production keeper bot calls this only when get-estimated-profit
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;; shows a positive return, ensuring the swap covers the fee.
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;; Execute flash loan callback
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(define-public (execute-flash (amount uint) (borrower principal))
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(let (
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(fee (/ (* amount u5) u10000))
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(total-owed (+ amount fee))
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(alex (var-get alex-price))
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(velar (var-get velar-price))
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(bitflow (var-get bitflow-price))
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(this-contract (as-contract tx-sender))
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)
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;; Step 1: Find best buy price (lowest)
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;; Verify the flash mint arrived
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(let (
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(best-buy-price (get-min-price alex bitflow))
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(best-buy-dex (if (< alex bitflow) "ALEX" "Bitflow"))
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(our-balance (unwrap! (as-contract (contract-call? .sbtc-token get-balance tx-sender)) ERR-INSUFFICIENT-BALANCE))
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)
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;; Step 2: Find best sell price (highest)
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(let (
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(best-sell-price (get-max-price velar bitflow))
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(best-sell-dex (if (> velar bitflow) "Velar" "Bitflow"))
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)
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;; Step 3: Calculate expected profit
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(let (
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(btc-bought (/ amount best-buy-price))
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(sbtc-received (/ (* btc-bought best-sell-price) u1))
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(gross-profit (- sbtc-received amount))
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(net-profit (- gross-profit fee))
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)
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;; Step 4: Verify profitability
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(asserts! (> net-profit u0) ERR-NO-PROFIT)
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;; Step 5: Execute trades (simulated)
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;; In production:
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;; - Buy BTC on best-buy-dex with amount
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;; - Sell BTC on best-sell-dex
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;; - Receive sbtc-received
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;; Step 6: Return loan + fee to FlashStack
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(try! (as-contract (contract-call? .sbtc-token transfer
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total-owed
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tx-sender
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.flashstack-core
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none
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)))
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;; Return success
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(ok true)
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)
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)
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(asserts! (>= our-balance total-owed) ERR-INSUFFICIENT-BALANCE)
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;; Repay flash loan + fee to flashstack-core.
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;;
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;; On mainnet this follows a two-leg ALEX swap:
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;; leg 1: (contract-call? 'SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9.amm-swap-pool-v1-1
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;; swap-helper ALEX-POOL-FACTOR .sbtc-token .susdt amount min-dy)
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;; leg 2: (contract-call? 'SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9.amm-swap-pool-v1-1
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;; swap-helper ALEX-POOL-FACTOR .susdt .sbtc-token usdt-received min-sbtc)
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;;
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;; The net sBTC received from leg 2 covers total-owed plus profit.
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;; On testnet, the contract repays directly from the minted balance.
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(try! (as-contract (contract-call? .sbtc-token transfer
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total-owed
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tx-sender
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.flashstack-core
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(some 0x464c415348)
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)))
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(ok true)
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)
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)
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)
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;; Helper functions
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(define-read-only (get-min-price (a uint) (b uint))
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(if (< a b) a b)
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)
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;; =============================================
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;; Profit Estimation (read-only)
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;; =============================================
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(define-read-only (get-max-price (a uint) (b uint))
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(if (> a b) a b)
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)
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;; Calculate potential profit before executing
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(define-read-only (calculate-arbitrage-profit (amount uint))
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;; Returns estimated profit breakdown for a given loan amount.
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;; On mainnet, pair this with an off-chain ALEX price feed to determine
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;; whether a swap opportunity is profitable before submitting the transaction.
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(define-read-only (get-estimated-profit (amount uint))
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(let (
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(fee (/ (* amount u5) u10000))
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(alex (var-get alex-price))
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(velar (var-get velar-price))
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(bitflow (var-get bitflow-price))
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(best-buy (get-min-price alex bitflow))
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(best-sell (get-max-price velar bitflow))
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)
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(let (
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(btc-amount (/ amount best-buy))
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(sbtc-received (/ (* btc-amount best-sell) u1))
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(gross-profit (- sbtc-received amount))
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(net-profit (- gross-profit fee))
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)
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(ok {
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amount: amount,
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best-buy-price: best-buy,
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best-sell-price: best-sell,
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gross-profit: gross-profit,
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fee: fee,
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net-profit: net-profit,
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profitable: (> net-profit u0),
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roi: (if (> amount u0) (/ (* net-profit u10000) amount) u0)
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})
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)
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(total-owed (+ amount fee))
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(min-profit (/ (* amount (var-get min-profit-bp)) u10000))
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)
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)
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;; Admin functions for testing
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(define-public (set-alex-price (price uint))
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(begin
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(asserts! (> price u0) ERR-INSUFFICIENT-LIQUIDITY)
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(ok (var-set alex-price price))
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(ok {
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loan-amount: amount,
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fee: fee,
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total-owed: total-owed,
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min-profit-required: min-profit,
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alex-pool-factor: ALEX-POOL-FACTOR,
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alex-amm: "SP3K8BC0PPEVCV7NZ6QSRWPQ2JE9E5B6N3PA0KBR9.amm-swap-pool-v1-1"
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})
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)
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)
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(define-public (set-velar-price (price uint))
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(begin
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(asserts! (> price u0) ERR-INSUFFICIENT-LIQUIDITY)
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(ok (var-set velar-price price))
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)
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)
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(define-public (set-bitflow-price (price uint))
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(begin
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(asserts! (> price u0) ERR-INSUFFICIENT-LIQUIDITY)
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(ok (var-set bitflow-price price))
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)
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)
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;; =============================================
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;; Admin
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;; =============================================
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(define-public (set-max-slippage (slippage uint))
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(define-public (set-min-profit-bp (new-bp uint))
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(begin
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(asserts! (<= slippage u500) ERR-SLIPPAGE-TOO-HIGH)
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(ok (var-set max-slippage slippage))
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(asserts! (<= new-bp u1000) ERR-SLIPPAGE-TOO-HIGH)
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(ok (var-set min-profit-bp new-bp))
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)
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)

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