{
  "approach": "Reference-only static fee grid. Every strategy competes against fixed 30 bps; candidate-minus-starter differences pair equal simulation seeds. Winner selected only on seeds 0..499; holdout used for confirmation, not reselection.",
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          "diff": -90.40593635731273
        },
        {
          "seed": 179,
          "diff": -88.43382756115659
        },
        {
          "seed": 5,
          "diff": -82.36906419839124
        },
        {
          "seed": 76,
          "diff": -82.03876249621544
        },
        {
          "seed": 491,
          "diff": -81.67470680910384
        }
      ],
      "sha256": "dad63b0f71a8e276158b8f4f7c2057b9e40f6b0756b2402dbb897cb8150f3d5b"
    },
    {
      "bid": 20,
      "ask": 20,
      "n": 500,
      "mean_edge": 285.73809000962586,
      "mean_diff": -88.38670214486116,
      "se": 0.8085706970903129,
      "worst": [
        {
          "seed": 118,
          "diff": -146.3613169634446
        },
        {
          "seed": 179,
          "diff": -142.38817426630283
        },
        {
          "seed": 76,
          "diff": -136.66542717464125
        },
        {
          "seed": 491,
          "diff": -135.4595026331255
        },
        {
          "seed": 5,
          "diff": -134.85178036083613
        }
      ],
      "sha256": "be2f04e131a97ab23091cba0cd353f4decf36ee690fad923278e466650695128"
    },
    {
      "bid": 15,
      "ask": 15,
      "n": 500,
      "mean_edge": 229.94609460043574,
      "mean_diff": -144.17869755405135,
      "se": 1.1349700595825805,
      "worst": [
        {
          "seed": 118,
          "diff": -220.3356359264738
        },
        {
          "seed": 179,
          "diff": -213.62939081793814
        },
        {
          "seed": 76,
          "diff": -209.89827917634102
        },
        {
          "seed": 491,
          "diff": -206.51721332964496
        },
        {
          "seed": 5,
          "diff": -204.65422061088896
        }
      ],
      "sha256": "0b226bb0336eb54011e5c2f53e3c524b23776d221eee7e1992aad1b7c45372ac"
    },
    {
      "bid": 10,
      "ask": 10,
      "n": 500,
      "mean_edge": 161.0573209032394,
      "mean_diff": -213.06747125124772,
      "se": 1.5343364863369873,
      "worst": [
        {
          "seed": 118,
          "diff": -310.10153014925305
        },
        {
          "seed": 179,
          "diff": -300.3088475279828
        },
        {
          "seed": 76,
          "diff": -299.102756293513
        },
        {
          "seed": 491,
          "diff": -293.1759719467717
        },
        {
          "seed": 256,
          "diff": -291.261557293617
        }
      ],
      "sha256": "0b35c178cbce3fc8e845969e01fbbee831eb104456a4b74b3ebd2011f32f6bf8"
    }
  ],
  "next": [
    "Reconcile pinned-commit vanilla score with the public ~522 baseline before comparing to leaderboard.",
    "Measure a finer fixed-fee grid near the training winner on unused tuning seeds, with a new untouched holdout.",
    "Use these fixed-fee results as controls for fair-price and volatility estimation strategies in other items."
  ],
  "code": "// SPDX-License-Identifier: MIT\npragma solidity ^0.8.24;\n\nimport {AMMStrategyBase} from \"./AMMStrategyBase.sol\";\nimport {TradeInfo} from \"./IAMMStrategy.sol\";\n\n/// @notice Fixed fees selected by paired static-grid measurements.\ncontract Strategy is AMMStrategyBase {\n    uint256 public constant BID_FEE = 75 * BPS;\n    uint256 public constant ASK_FEE = 75 * BPS;\n\n    function afterInitialize(uint256, uint256) external pure override returns (uint256, uint256) {\n        return (BID_FEE, ASK_FEE);\n    }\n\n    function afterSwap(TradeInfo calldata) external pure override returns (uint256, uint256) {\n        return (BID_FEE, ASK_FEE);\n    }\n\n    function getName() external pure override returns (string memory) {\n        return \"Static Grid 75/75\";\n    }\n}\n",
  "code_sha256": "5837798b91013de606cce87771bc2f4d40d0ae43b7b75aeab9c7a55e2e18670c",
  "score": {
    "seed_start": 0,
    "n": 1000,
    "mean_edge": 380.14166842626247
  },
  "paired": {
    "reference": "contracts/src/StarterStrategy.sol (fixed 50 bps), pinned commit 6b6921f8d463314aa7c96234e1be25a25245f704",
    "seed_start": 100000,
    "n": 2000,
    "mean_diff": 10.609942906164084,
    "se": 0.16035915638608614,
    "worst": [
      {
        "seed": 101071,
        "diff": -8.316604182827973
      },
      {
        "seed": 101882,
        "diff": -6.313948816298279
      },
      {
        "seed": 100631,
        "diff": -5.873593780895021
      },
      {
        "seed": 100621,
        "diff": -5.851080135988013
      },
      {
        "seed": 100645,
        "diff": -5.656776966611545
      }
    ]
  },
  "seconds_per_simulation": 0.06393043716878469,
  "validate_ok": true,
  "citations": [
    {
      "url": "https://github.com/benedictbrady/amm-challenge/tree/6b6921f8d463314aa7c96234e1be25a25245f704",
      "use": "Pinned simulator, source, official compiler/validator and configuration. Its README quotes a typical normalizer edge of 250-350."
    },
    {
      "url": "https://www.paradigm.xyz/puzzles/amm",
      "use": "Challenge landing page; browser tool failed, curl succeeded."
    },
    {
      "url": "https://github.com/dipankar/amm-challenge/blob/main/ANALYSIS.md",
      "use": "Public first-person write-up discusses hidden-state estimation versus trade classification; contextual only, no mechanism adopted."
    },
    {
      "url": "https://github.com/jiayaoqijia/amm-challenge-yq",
      "use": "Public author reports cross-seed fixed-30 baseline 522.13; this is external context, not reproduced at pinned commit."
    }
  ],
  "best_fixed_pair": {
    "bid": 75,
    "ask": 75
  },
  "finalists": [
    {
      "bid": 75,
      "ask": 75,
      "n": 2000,
      "mean_edge": 380.1112443435281,
      "mean_diff": 10.609942906164084,
      "se": 0.16035915638608614,
      "worst": [
        {
          "seed": 101071,
          "diff": -8.316604182827973
        },
        {
          "seed": 101882,
          "diff": -6.313948816298279
        },
        {
          "seed": 100631,
          "diff": -5.873593780895021
        },
        {
          "seed": 100621,
          "diff": -5.851080135988013
        },
        {
          "seed": 100645,
          "diff": -5.656776966611545
        }
      ],
      "sha256": "5837798b91013de606cce87771bc2f4d40d0ae43b7b75aeab9c7a55e2e18670c"
    },
    {
      "bid": 80,
      "ask": 80,
      "n": 2000,
      "mean_edge": 380.00571138301086,
      "mean_diff": 10.504409945646923,
      "se": 0.18499916860250887,
      "worst": [
        {
          "seed": 101071,
          "diff": -11.688595834135867
        },
        {
          "seed": 100621,
          "diff": -9.355026444293571
        },
        {
          "seed": 100004,
          "diff": -8.844580465560341
        },
        {
          "seed": 101882,
          "diff": -8.764649280756345
        },
        {
          "seed": 100645,
          "diff": -8.391617066668033
        }
      ],
      "sha256": "6520f51b6731384562842a924284b66b18bf3689f908c86d16da046ff7ee6f76"
    }
  ],
  "vanilla_score": {
    "seed_start": 0,
    "n": 1000,
    "mean_edge": 343.601010706896
  },
  "promotion": {
    "promoted": true,
    "rule": "fresh paired mean_diff > 2*se",
    "previous_best": "starter; no other network-best contract supplied",
    "ranked": [
      {
        "rank": 1,
        "bid": 75,
        "ask": 75,
        "code_sha256": "5837798b91013de606cce87771bc2f4d40d0ae43b7b75aeab9c7a55e2e18670c",
        "mean_diff": 10.609942906164084,
        "se": 0.16035915638608614
      }
    ]
  },
  "measurement": {
    "commit": "6b6921f8d463314aa7c96234e1be25a25245f704",
    "workers": 8,
    "batch_size": 20,
    "unique_simulations": 23000,
    "batch_seconds": 1470.4000548820477,
    "timing_definition": "sum of timed run_batch calls / completed simulations; includes result and step allocation, excludes compilation and JSON writes",
    "se_definition": "sample standard deviation of paired per-seed differences divided by sqrt(n)",
    "selection": "31 distinct pairs: 19 symmetric from 10 through 100 in steps of 5, union 16 ordered pairs over {20,30,45,60}; four symmetric duplicates evaluated once",
    "pilot_seconds_per_simulation": 0.06472102614934556
  },
  "changed": [
    "candidates/static-grid/Strategy.sol",
    "candidates/static-grid/result.json",
    "candidates/static-grid/NOTES.md",
    "artifacts/goal/batches/r1/items/static-grid/result.json"
  ],
  "checks": [
    "Pinned commit checked out in test/scratch/static-grid/simulator; built release Rust wheel with maturin and installed Python dependencies in scratch venv.",
    "Custom seed configs equal official MatchRunner._build_configs on all 12 fields for seeds 0..19; actual VanillaStrategy bytecode edges exactly equal fixed 30/30 edges on all 20 seeds.",
    "All grid candidates compiled using official SolidityCompiler (Solidity 0.8.24, optimizer 200, viaIR, Paris), enforcing opcode and storage restrictions.",
    "Grid: 500 equal seeds per candidate and starter; finalists: 2000 fresh equal seeds each and starter.",
    "amm-match validate candidates/static-grid/Strategy.sol: Validating strategy... | Compiling strategy... | Strategy 'Static Grid 75/75' validated successfully!",
    "Source SHA-256 recomputed; JSON parsed and embedded source checked against Strategy.sol; bundle paths and size checked.",
    "Fixed 50/50 per-seed edges exactly equal the starter for all 500 grid seeds; all 31 requested pairs are present. CLI vanilla score agrees with the custom 1000-seed run within its printed precision.",
    "Independent CLI vanilla run: Validating strategy... | Compiling strategy... | Strategy: Vanilla_30bps |  | Running 1000 simulations... |  | Vanilla_30bps Edge: 343.60",
    "Independent Python statistics.mean/stdev recomputation passed for all 31 grid rows and both 2000-seed finalists, including all five worst per-seed differences. Identical JSON output copies, source content/SHA-256, required file existence, 64000-byte JSON cap, and 8 MiB bundle cap verified."
  ],
  "limitations": [
    "Local vanilla score differs materially from the externally reported ~522. The pinned README itself says 250-350 for the normalizer; the cause of the public-score difference is unverified. No claim of leaderboard parity or first place.",
    "No previous network-best source was provided, so the previous-best comparison is the supplied starter.",
    "No numbers or missing measurements fabricated."
  ],
  "failures": [
    "Initial `python -m venv` failed: python command not found; used python3.",
    "Initial maturin build failed: cargo not found; installed workspace-local Rust.",
    "Initial rustup installer failed because /tmp was absent; retried successfully with workspace TMPDIR."
  ],
  "starter": {
    "code_sha256": "8f2cea337f6736105f58c6758da6c3ebf002951d34492bcd5b7101bef2d1e7f3",
    "training_score": {
      "seed_start": 0,
      "n": 500,
      "mean_edge": 374.1247921544871
    },
    "holdout_score": {
      "seed_start": 100000,
      "n": 2000,
      "mean_edge": 369.50130143736396
    }
  },
  "finalist_head_to_head": {
    "reference": "80/80",
    "seed_start": 100000,
    "n": 2000,
    "mean_diff": 0.10553296051716252,
    "se": 0.026400103743076248,
    "worst": [
      {
        "seed": 101790,
        "diff": -4.735999849573261
      },
      {
        "seed": 100574,
        "diff": -4.732503655986534
      },
      {
        "seed": 101725,
        "diff": -4.360191540166568
      },
      {
        "seed": 100752,
        "diff": -4.3476699364308615
      },
      {
        "seed": 100358,
        "diff": -4.300975717160554
      }
    ]
  }
}