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Mantle Mainnet risk:65 verified

Feedback #25

For agent 97 on Mantle Mainnet · 2026-06-23

archon.audit.report
100.0

Off-chain feedback document

raw JSON
{
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  },
  "report": {
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      "solcVersion": "0.8.24",
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                "daFootprintGasScalar": "400"
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                "txHash": "0xb9ce87de86b212b91eb64012bbdab91014373da1f6d960470b340e1991a1a7c5",
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          },
          "source": "receipt-calibrated",
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        "sourceHash": "0x869a106b3098bce47c056498615255232f995ac9590aedf01d581a4022db7a9c",
        "measurement": {
          "forge": {
            "ok": false,
            "error": "Error (7576): Undeclared identifier.",
            "command": "forge test --gas-report",
            "attempted": true,
            "gasReport": null
          },
          "source": "deterministic-estimate",
          "status": "degraded",
          "patches": [
            {
              "note": "Review-only patch is not auto-applied for measurement.",
              "after": "Group adjacent bool/address/small uint fields together and place full-slot fields after them.",
              "before": "uint8 public decimals = 6; … address public owner;",
              "ruleId": "storage-packing",
              "safety": "review",
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              "l2GasDelta": 20000,
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            },
            {
              "note": "Review-only patch is not auto-applied for measurement.",
              "after": "Use the smallest ABI-safe integer width only when the domain is bounded and documented.",
              "before": "function approve(address spender, uint256 amount) external returns (bool) {",
              "ruleId": "calldata-smaller-types",
              "safety": "review",
              "status": "skipped",
              "l2GasDelta": null,
              "l1DaDeltaWei": null
            },
            {
              "note": "Foundry measurement unavailable; deterministic rule estimate retained and clearly labeled.",
              "after": "error INSUFFICIENTBALANCE(); … if (!(condition)) revert INSUFFICIENTBALANCE();",
              "before": "require(balanceOf[msg.sender] >= amount, \"INSUFFICIENT_BALANCE\");",
              "ruleId": "custom-errors",
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              "l2GasDelta": 120,
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            },
            {
              "note": "Foundry measurement unavailable; deterministic rule estimate retained and clearly labeled.",
              "after": "error INSUFFICIENTBALANCE(); … if (!(condition)) revert INSUFFICIENTBALANCE();",
              "before": "require(balanceOf[from] >= amount, \"INSUFFICIENT_BALANCE\");",
              "ruleId": "custom-errors",
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            },
            {
              "note": "Foundry measurement unavailable; deterministic rule estimate retained and clearly labeled.",
              "after": "error INSUFFICIENTALLOWANCE(); … if (!(condition)) revert INSUFFICIENTALLOWANCE();",
              "before": "require(allowance[from][msg.sender] >= amount, \"INSUFFICIENT_ALLOWANCE\");",
              "ruleId": "custom-errors",
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            },
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              "note": "Review-only patch is not auto-applied for measurement.",
              "after": "mapping(uint256 => uint256) bitmap; // pack 256 flags per slot",
              "before": "mapping(address => bool) public blacklisted;",
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              "safety": "review",
              "status": "skipped",
              "l2GasDelta": 20000,
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          "version": "archon.gasMeasurement.v1",
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          "rulesetHash": "994333ddc3034368c57d77e1d297b84abff37bdd92bbd7e8be0bc24439072dd9",
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        },
        "opportunities": [
          {
            "id": "storage-packing",
            "file": "MantleUSDCe_Interface.sol",
            "after": "Group adjacent bool/address/small uint fields together and place full-slot fields after them.",
            "patch": {
              "newText": "    uint8 public decimals = 6; // REVIEW: reorder adjacent small storage fields with nearby small fields to reduce SSTORE/SLOAD slots",
              "oldText": "    uint8 public decimals = 6;"
            },
            "title": "Pack small storage variables into fewer slots",
            "where": "MantleUSDCe_Interface.sol:10",
            "before": "uint8 public decimals = 6; … address public owner;",
            "safety": "review",
            "newText": "    uint8 public decimals = 6; // REVIEW: reorder adjacent small storage fields with nearby small fields to reduce SSTORE/SLOAD slots",
            "oldText": "    uint8 public decimals = 6;",
            "category": "storage",
            "severity": "medium",
            "lineStart": 10,
            "rationale": "Storage slot packing can remove entire SSTORE/SLOAD slots but changes layout, so upgradeable contracts need manual review.",
            "confidence": 0.64,
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            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 20000,
            "estimatedDataBytesSaved": null
          },
          {
            "id": "calldata-smaller-types",
            "file": "MantleUSDCe_Interface.sol",
            "after": "Use the smallest ABI-safe integer width only when the domain is bounded and documented.",
            "patch": {
              "newText": "    function approve(address spender, uint256 amount) external returns (bool) { // REVIEW: bounded calldata params may be packable/smaller in structs or encoded batches",
              "oldText": "    function approve(address spender, uint256 amount) external returns (bool) {"
            },
            "title": "Review calldata parameter width",
            "where": "MantleUSDCe_Interface.sol:40",
            "before": "function approve(address spender, uint256 amount) external returns (bool) {",
            "safety": "review",
            "newText": "    function approve(address spender, uint256 amount) external returns (bool) { // REVIEW: bounded calldata params may be packable/smaller in structs or encoded batches",
            "oldText": "    function approve(address spender, uint256 amount) external returns (bool) {",
            "category": "calldata",
            "severity": "low",
            "lineStart": 40,
            "rationale": "For individual ABI params uint256 still occupies a full word, but bounded types help packed structs/batches and prevent redundant calldata.",
            "confidence": 0.55,
            "estL1Delta": 16,
            "estL2Delta": null,
            "annualizedBasis": "Receipt-calibrated DA estimate for calldata/data bytes; exact deltas require V2.1.2 harness measurement.",
            "estimatedGasSaved": null,
            "estimatedDataBytesSaved": 16
          },
          {
            "id": "custom-errors",
            "file": "MantleUSDCe_Interface.sol",
            "after": "error INSUFFICIENTBALANCE(); … if (!(condition)) revert INSUFFICIENTBALANCE();",
            "patch": {
              "newText": "        if (!(balanceOf[msg.sender] >= amount)) revert INSUFFICIENTBALANCE();",
              "oldText": "        require(balanceOf[msg.sender] >= amount, \"INSUFFICIENT_BALANCE\");"
            },
            "title": "Replace long revert string with custom error",
            "where": "MantleUSDCe_Interface.sol:53",
            "before": "require(balanceOf[msg.sender] >= amount, \"INSUFFICIENT_BALANCE\");",
            "safety": "safe",
            "newText": "        if (!(balanceOf[msg.sender] >= amount)) revert INSUFFICIENTBALANCE();",
            "oldText": "        require(balanceOf[msg.sender] >= amount, \"INSUFFICIENT_BALANCE\");",
            "category": "deployment",
            "severity": "info",
            "lineStart": 53,
            "rationale": "Custom errors reduce deployment bytecode and revert-path gas while preserving typed failure semantics.",
            "confidence": 0.9,
            "estL1Delta": 20,
            "estL2Delta": 120,
            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 120,
            "estimatedDataBytesSaved": 20
          },
          {
            "id": "custom-errors",
            "file": "MantleUSDCe_Interface.sol",
            "after": "error INSUFFICIENTBALANCE(); … if (!(condition)) revert INSUFFICIENTBALANCE();",
            "patch": {
              "newText": "        if (!(balanceOf[from] >= amount)) revert INSUFFICIENTBALANCE();",
              "oldText": "        require(balanceOf[from] >= amount, \"INSUFFICIENT_BALANCE\");"
            },
            "title": "Replace long revert string with custom error",
            "where": "MantleUSDCe_Interface.sol:68",
            "before": "require(balanceOf[from] >= amount, \"INSUFFICIENT_BALANCE\");",
            "safety": "safe",
            "newText": "        if (!(balanceOf[from] >= amount)) revert INSUFFICIENTBALANCE();",
            "oldText": "        require(balanceOf[from] >= amount, \"INSUFFICIENT_BALANCE\");",
            "category": "deployment",
            "severity": "info",
            "lineStart": 68,
            "rationale": "Custom errors reduce deployment bytecode and revert-path gas while preserving typed failure semantics.",
            "confidence": 0.9,
            "estL1Delta": 20,
            "estL2Delta": 120,
            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 120,
            "estimatedDataBytesSaved": 20
          },
          {
            "id": "custom-errors",
            "file": "MantleUSDCe_Interface.sol",
            "after": "error INSUFFICIENTALLOWANCE(); … if (!(condition)) revert INSUFFICIENTALLOWANCE();",
            "patch": {
              "newText": "        if (!(allowance[from][msg.sender] >= amount)) revert INSUFFICIENTALLOWANCE();",
              "oldText": "        require(allowance[from][msg.sender] >= amount, \"INSUFFICIENT_ALLOWANCE\");"
            },
            "title": "Replace long revert string with custom error",
            "where": "MantleUSDCe_Interface.sol:69",
            "before": "require(allowance[from][msg.sender] >= amount, \"INSUFFICIENT_ALLOWANCE\");",
            "safety": "safe",
            "newText": "        if (!(allowance[from][msg.sender] >= amount)) revert INSUFFICIENTALLOWANCE();",
            "oldText": "        require(allowance[from][msg.sender] >= amount, \"INSUFFICIENT_ALLOWANCE\");",
            "category": "deployment",
            "severity": "info",
            "lineStart": 69,
            "rationale": "Custom errors reduce deployment bytecode and revert-path gas while preserving typed failure semantics.",
            "confidence": 0.9,
            "estL1Delta": 22,
            "estL2Delta": 120,
            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 120,
            "estimatedDataBytesSaved": 22
          },
          {
            "id": "immutable-constant",
            "file": "MantleUSDCe_Interface.sol",
            "after": "address immutable public owner;",
            "patch": {
              "newText": "    address immutable public owner;",
              "oldText": "    address public owner;"
            },
            "title": "Mark never-changing value constant or immutable",
            "where": "MantleUSDCe_Interface.sol:13",
            "before": "address public owner;",
            "safety": "review",
            "newText": "    address immutable public owner;",
            "oldText": "    address public owner;",
            "category": "storage",
            "severity": "info",
            "lineStart": 13,
            "rationale": "Constants/immutables avoid storage reads for values that do not change after deployment.",
            "confidence": 0.62,
            "estL1Delta": null,
            "estL2Delta": 2100,
            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 2100,
            "estimatedDataBytesSaved": null
          },
          {
            "id": "cache-repeated-sload",
            "file": "MantleUSDCe_Interface.sol",
            "after": "uint256 cached = balanceOf[msg.sender]; // reuse cached value",
            "patch": {
              "newText": "balanceOf[msg.sender]",
              "oldText": "balanceOf[msg.sender]"
            },
            "title": "Cache repeated storage read",
            "where": "MantleUSDCe_Interface.sol:53",
            "before": "balanceOf[msg.sender] read 2 times",
            "safety": "review",
            "newText": "balanceOf[msg.sender]",
            "oldText": "balanceOf[msg.sender]",
            "category": "storage",
            "severity": "info",
            "lineStart": 53,
            "rationale": "Repeated SLOADs should be cached in stack/memory when state cannot change between reads.",
            "confidence": 0.7,
            "estL1Delta": null,
            "estL2Delta": 100,
            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 100,
            "estimatedDataBytesSaved": null
          },
          {
            "id": "cache-repeated-sload",
            "file": "MantleUSDCe_Interface.sol",
            "after": "uint256 cached = balanceOf[to]; // reuse cached value",
            "patch": {
              "newText": "balanceOf[to]",
              "oldText": "balanceOf[to]"
            },
            "title": "Cache repeated storage read",
            "where": "MantleUSDCe_Interface.sol:56",
            "before": "balanceOf[to] read 2 times",
            "safety": "review",
            "newText": "balanceOf[to]",
            "oldText": "balanceOf[to]",
            "category": "storage",
            "severity": "info",
            "lineStart": 56,
            "rationale": "Repeated SLOADs should be cached in stack/memory when state cannot change between reads.",
            "confidence": 0.7,
            "estL1Delta": null,
            "estL2Delta": 100,
            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 100,
            "estimatedDataBytesSaved": null
          },
          {
            "id": "cache-repeated-sload",
            "file": "MantleUSDCe_Interface.sol",
            "after": "uint256 cached = balanceOf[from]; // reuse cached value",
            "patch": {
              "newText": "balanceOf[from]",
              "oldText": "balanceOf[from]"
            },
            "title": "Cache repeated storage read",
            "where": "MantleUSDCe_Interface.sol:68",
            "before": "balanceOf[from] read 2 times",
            "safety": "review",
            "newText": "balanceOf[from]",
            "oldText": "balanceOf[from]",
            "category": "storage",
            "severity": "info",
            "lineStart": 68,
            "rationale": "Repeated SLOADs should be cached in stack/memory when state cannot change between reads.",
            "confidence": 0.7,
            "estL1Delta": null,
            "estL2Delta": 100,
            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 100,
            "estimatedDataBytesSaved": null
          },
          {
            "id": "cache-repeated-sload",
            "file": "MantleUSDCe_Interface.sol",
            "after": "uint256 cached = allowance[from]; // reuse cached value",
            "patch": {
              "newText": "allowance[from]",
              "oldText": "allowance[from]"
            },
            "title": "Cache repeated storage read",
            "where": "MantleUSDCe_Interface.sol:69",
            "before": "allowance[from] read 2 times",
            "safety": "review",
            "newText": "allowance[from]",
            "oldText": "allowance[from]",
            "category": "storage",
            "severity": "info",
            "lineStart": 69,
            "rationale": "Repeated SLOADs should be cached in stack/memory when state cannot change between reads.",
            "confidence": 0.7,
            "estL1Delta": null,
            "estL2Delta": 100,
            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 100,
            "estimatedDataBytesSaved": null
          },
          {
            "id": "bitmap-bools",
            "file": "MantleUSDCe_Interface.sol",
            "after": "mapping(uint256 => uint256) bitmap; // pack 256 flags per slot",
            "patch": {
              "newText": "    mapping(address => bool) public blacklisted; // REVIEW: high-volume bool flags can be bitmap-packed",
              "oldText": "    mapping(address => bool) public blacklisted;"
            },
            "title": "Bitmap-pack boolean flags",
            "where": "MantleUSDCe_Interface.sol:18",
            "before": "mapping(address => bool) public blacklisted;",
            "safety": "review",
            "newText": "    mapping(address => bool) public blacklisted; // REVIEW: high-volume bool flags can be bitmap-packed",
            "oldText": "    mapping(address => bool) public blacklisted;",
            "category": "storage",
            "severity": "medium",
            "lineStart": 18,
            "rationale": "Bitmap packing can reduce many boolean SSTOREs from one slot per flag to one slot per 256 flags.",
            "confidence": 0.62,
            "estL1Delta": null,
            "estL2Delta": 20000,
            "annualizedBasis": "Static deterministic estimate. Exact runtime deltas require queued Foundry snapshots with representative inputs.",
            "estimatedGasSaved": 20000,
            "estimatedDataBytesSaved": null
          }
        ]
      }
    },
    "scanId": "83634c3b-9ef6-48b1-aefc-9ca9ea92f2d5",
    "createdAt": "2026-06-23T02:25:16.471Z",
    "riskScore": 65,
    "contractName": "MantleUSDCe_Interface",
    "severityCounts": {
      "low": 6,
      "high": 0,
      "info": 9,
      "medium": 2,
      "critical": 0
    },
    "executiveSummary": "Archon completed a read-only Mantle Mainnet audit of MantleUSDCe_Interface and found 17 deterministic findings. The highest-priority issue is Naming Convention, with risk score 65/100 based on severity-weighted findings. The contract name 'MantleUSDCe_Interface' is misleading because it declares state variables and functions with implementations, which is not typical for an interface. This naming convention may confuse developers expecting a pure interface, potentially leading to misuse during integration. Review the recommended fixes and run regression tests before deployment."
  },
  "schema": "archon.proof.metadata.v1",
  "erc8004": {
    "verifiedConfig": true,
    "agentIdentityRef": "eip155:5000:0x8004A169FB4a3325136EB29fA0ceB6D2e539a432:97",
    "identityRegistry": "0x8004A169FB4a3325136EB29fA0ceB6D2e539a432",
    "reputationRegistry": "0x8004BAa17C55a88189AE136b182e5fdA19dE9b63",
    "validationRegistry": null
  },
  "product": "Archon",
  "findings": [
    {
      "id": "e6d3db15-5ae7-4101-b33a-85a6ef16bad2",
      "title": "Naming Convention",
      "category": "naming-convention",
      "location": {
        "file": "MantleUSDCe_Interface.sol",
        "lineEnd": 89,
        "lineStart": 7
      },
      "severity": "info"
    },
    {
      "id": "77df2712-a290-4677-88f4-7a731641b1c5",
      "title": "Constable States",
      "category": "constable-states",
      "location": {
        "file": "MantleUSDCe_Interface.sol",
        "lineEnd": 12,
        "lineStart": 12
      },
      "severity": "low"
    },
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source URI: ipfs://QmVRo6kTxKou485FDD3BGWkEGFUrYZkZTKAe5vpV8VzMfL