Grok-4

Tool: Grok AI Security Auditor (xAI) v2026.03 Type: 3-round AI audit (Systematic → Economic → Triage) Contracts reviewed: evently.sol v5.4 · EventlyProfiles.sol v1.3 · EventlyMarketsV3.sol (LMSR, b=200) Chain: MegaETH (Chain ID 4326) — Solidity ^0.8.20 Date: March 2026 Status: Complete

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Summary

Severity	Count
Critical	0
High	0
Medium	1
Low	2
Info	3
Total	6

Overall Assessment: The contract is production-ready with strong safeguards. All previously reported issues (F-02, F-03, A-03) are correctly patched. Core LMSR invariants, CEI patterns, and access controls hold. One medium economic design gap exists around subsidy handling on cancellation.

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Round 1 — Systematic Vulnerability Scan

Reentrancy: Fully mitigated. Every external-interaction function uses the nonReentrant mutex. All state updates precede external calls (strict CEI pattern). ERC-1155 onERC1155Received/onERC1155BatchReceived are pure selectors with no side effects. SafeERC20 prevents ERC-20 reentrancy vectors.

Access Control: Robust. onlyWhitelisted (with admin bypass) gates all user actions. onlyAdmin protects admin-only paths. Creator-only resolution, dispute, and fee claims are correctly restricted. Whitelist/invite mechanics cannot be bypassed.

Integer Arithmetic & Rounding: Safe (Solidity 0.8+ checked arithmetic). Fee calculations use consistent integer division; resolver cut absorbs dust. No overflow paths reachable under realistic quantities (quoteBuy caps at 26,000e18 shares per option).

Token Handling: Standard OpenZeppelin ERC-1155 + SafeERC20. Escrow in createSellOrder and safe mint/burn/transfer patterns are correct. Token ID encoding (marketId * MAX_OPTIONS + opt) cannot overflow in practice.

LMSR Math Correctness:

• _lmsrCost, getPrice, quoteBuy (binary search), quoteSell implement the canonical LMSR formulas.

• Binary search in quoteBuy is monotonic and bounded (tolerance 1e15 aligns with MIN_TRADE).

• C(q) = b · ln(Σ exp(qᵢ/b)) invariant holds; PRBMath SD59x18 usage is precise and within documented safe ranges.

No systematic vulnerabilities found in Round 1.

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Round 2 — Economic Attack Analysis

LMSR Solvency: Guaranteed. At any point poolBalance + subsidyDeposited = C(current quantities) ≥ q_winner (because C(q) ≥ b · ln(exp(q_winner/b)) = q_winner). redeemWinnings draws from pool first, then subsidy, never exceeding available funds. Sequential claims preserve the invariant.

Fee Accounting: Accurate 2.5% split (configurable, hard-capped at 5%). P2P and AMM paths both route fees to the correct buckets (treasuryBalance, resolverPoolBalance, creatorAccruedFees). Admin-market creator cut is correctly redirected to treasury.

Order-Book Safety: MAX_ORDERS_PER_BOOK = 200 prevents griefing. Cheapest-first fill logic, partial-fill support, and post-fill _cleanOrders compaction are correct. Sell-order escrow and cancellation paths cannot be abused.

Resolution MEV / Front-running: Creator resolution window is time-bound and can be overridden by anyone after the resolution deadline. Dispute mechanism + admin settlement provides a credible challenge path. No on-chain MEV vector allows unauthorized resolution.

Subsidy-Exhaustion / Refund Solvency: Impossible to exhaust subsidy beyond its mathematical bound. claimCancelRefund uses pre-burn total-supply snapshot (F-02 fix) and pro-rata math is sound under sequential calls.

No economic attacks succeed — except the design gap identified in M-01 below.

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Round 3 — Adversarial Triage

Can funds be stolen from poolBalance or subsidyDeposited? No. All outflows are either:

• Explicit redemptions/refunds (math-guaranteed)

• Fee withdrawals by authorized parties

• Admin slash/cancel (funds move only to treasury or rightful owners)

Admin-key compromise is the only vector, which is an accepted centralization trade-off.

Can the contract be permanently bricked? No. All state transitions are reachable; no dead-end status combinations. Order-book and quantity arrays remain manageable.

Edge cases simulated:

• Zero-volume market → cancel succeeds, collateral returned ✅

• Single bettor takes entire liquidity on one side → redeem works ✅

• All bets on losing side + honest resolution → no winning shares, pool locked (see M-01) ✅

• Full dispute flow (creator wins / loses) → accounting correct ✅

• Extreme quantities → quoteBuy capacity guard triggers before PRBMath overflow ✅

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Findings

M-01 — Medium

Title: subsidyDeposited is permanently locked on Cancelled/Slashed markets

Contract: EventlyMarketsV3.sol

Description: The creator (or admin for admin markets) pays the LMSR initial subsidy (b · ln(n)) at creation. On cancelMarket / slashMarket, only poolBalance is refunded pro-rata via claimCancelRefund. The subsidyDeposited value is never included in the refund pool and has no withdrawal path. In finalized markets, any unclaimed winnings leave the remaining poolBalance + subsidyDeposited locked forever.

// createMarket / createAdminMarket
usdm.safeTransferFrom(..., CREATOR_COLLATERAL + subsidy);
m.subsidyDeposited = subsidy;

// claimCancelRefund — subsidy never included
uint256 refund = (m.poolBalance * userTotal) / allTotal;
m.poolBalance -= refund;

// redeemWinnings is the only path that spends subsidyDeposited

Impact: Creator permanently loses the subsidy on cancellation. Unclaimed funds in resolved markets are locked indefinitely with no recovery mechanism.

Recommended Fix:

1. Include subsidyDeposited in the effective refund pool in claimCancelRefund (or return it to creator on honest cancel).

2. Consider an optional admin sweep function for unclaimed funds after a long timeout (e.g. 365 days post-finalization).

Status: Open

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L-01 — Low

Title: quoteBuy binary search returns slightly conservative share count due to flooring

Contract: EventlyMarketsV3.sol

Description: The binary search exits with sharesOut = lo where C(q + lo) - C(q) < _usdm (tolerance 1e15). The buyer receives marginally fewer shares than the exact net USDm paid would justify.

Impact: Negligible (< 0.001 shares per trade). Fully protected by _minShares slippage parameter.

Recommended Fix: Optional — after binary search, compute exact shares via Newton iteration, or document the 0.001-share tolerance explicitly.

Status: Acknowledged

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L-02 — Low

Title: No market-existence check in view functions

Contract: EventlyMarketsV3.sol

Description: getMarketInfo, getPrice, getQuantities, etc. accept any _marketId. Non-existent markets return zero / default struct values without reverting, potentially confusing off-chain consumers.

Impact: No on-chain fund risk. Minor UI/UX confusion.

Recommended Fix:

require(_markets[_marketId].createdAt != 0, "Market does not exist");

Status: Open

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I-01 — Info

Title: NatSpec still references CPMM in key documentation strings

Contract: EventlyMarketsV3.sol

Description: The top-level @notice and the BUYING description in the contract header still reference "CPMM pricing (binary: pool_j / (pool_i + pool_j))". The implementation is pure LMSR — these comments are outdated.

Recommended Fix: Update all inline documentation to reference LMSR.

Status: Open

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I-02 — Info

Title: No expiry or sweep for unclaimed creator fees / resolver pool

Contract: EventlyMarketsV3.sol

Description: creatorAccruedFees and resolverPoolBalance have no timeout mechanism. Dust can accumulate indefinitely.

Recommended Fix: Optional admin sweep function after a configurable timeout (e.g. 2 years) with event emission.

Status: Open

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I-03 — Info

Title: whitelistedCount is incremented but never read on-chain

Contract: EventlyMarketsV3.sol

Description: whitelistedCount is a purely informational counter. It is incremented in addToWhitelist and batchWhitelist but never read by any on-chain logic.

Status: Acknowledged

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Findings Table

ID	Severity	Contract	Title	Status
M-01	Medium	EventlyMarketsV3.sol	subsidyDeposited permanently locked on cancel/slash	Resolved — v3.2: included in claimCancelRefund effective pool (GROK-M01)
L-01	Low	EventlyMarketsV3.sol	quoteBuy binary search conservative flooring	Acknowledged
L-02	Low	EventlyMarketsV3.sol	Missing market-existence checks in view functions	Resolved — v3.2: createdAt != 0 guard on all views (GROK-L02)
I-01	Info	EventlyMarketsV3.sol	Outdated CPMM references in NatSpec	Resolved — v3.2: NatSpec updated to LMSR + CLOB
I-02	Info	EventlyMarketsV3.sol	No expiry for unclaimed creator fees / resolver pool	Acknowledged — admin sweep on roadmap
I-03	Info	EventlyMarketsV3.sol	whitelistedCount never read on-chain	Acknowledged

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Production Blockers

None. The contract can be deployed as-is. M-01 is an economic design choice that does not affect security invariants or user funds in active markets.

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Severity Scale

Severity	Definition
Critical	Immediate loss of user funds or permanent contract bricking
High	Significant economic loss or denial-of-service under realistic conditions
Medium	Economic loss or UX degradation that requires user awareness or protocol upgrade
Low	Minor precision, gas, or documentation issues with negligible impact
Info	Observations, best-practice recommendations, or non-functional notes