{
  "license": "CC-BY-4.0",
  "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "ChainChoice (https://chainchoice.io)",
  "url": "https://chainchoice.io/data/methodology/2026.09.1.json",
  "version": "2026.09.1",
  "status": "archived",
  "publishedAt": "2026-09-02",
  "title": "An empty string matched every market",
  "supersededBy": "2026.09.2",
  "previous": "2026.09.0",
  "changelog": {
    "url": "https://chainchoice.io/methodology/changelog/archive#v-2026.09.1",
    "entry": {
      "version": "2026.09.1",
      "publishedAt": "2026-09-02",
      "title": "An empty string matched every market",
      "summary": "scoreAvailability compared each of a product's markets against the visitor's country with String.includes. On the un-personalised path — every /best page, every prerendered route and the rankings.json feed itself — no country is stated, so the needle was the empty string and every market name matched. Two products were silently excluded from every published ranking, and a 20-versus-18 step became \"does this row have a non-empty primaryMarkets array\".",
      "rationale": "bill_pay/swapin, restricted in the United Kingdom and Hungary, and stablecoin_yield/ethena_susde, restricted in the United States and Germany, are available nearly everywhere else. Both vanished from a catalog whose first rule is that an exclusion is published with its reason. The scoring half awarded six of 106 published points for catalog field population rather than for anything about the product. The country match now requires a stated country.",
      "affectedCategories": [
        "all"
      ],
      "changes": [
        {
          "type": "fixed",
          "description": "Restored 2 products excluded from every published ranking by an always-true country match: bill_pay/swapin and stablecoin_yield/ethena_susde. The catalog publishes 934 scored products, up from 932."
        },
        {
          "type": "fixed",
          "description": "Availability no longer awards a primary-market bonus when no country is stated. Measured effect: 2 categories changed leader (tokenised_tbills, tokenised_funds) and 6 reordered below the top."
        },
        {
          "type": "added",
          "description": "Each category now publishes dimensionSpread in rankings.json — how far each dimension actually varied across its pool. A base weight is how much a dimension COULD move a score; the spread is how much it did."
        },
        {
          "type": "added",
          "description": "Measured and disclosed: profileFit takes two values across 934 rows and is constant in 114 of 114 categories, so its 20 of 106 points order nothing. frictionFit is constant in 98 categories, trustBonus in 99, quantitative in 103. objectiveFit alone reproduces the published leader in 103 of 114."
        },
        {
          "type": "changed",
          "description": "Corrected 2026-10-14: every published score in every category was recomputed under this version. The rows whose score or rank moved are summarised in the lines above, not each named."
        }
      ],
      "approvedBy": "mathias-siemonsmeier"
    }
  },
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      "src": "git:cd537763a277bcbbf61396369e199fd47f18a128",
      "at": "2026-09-02T22:34:50+02:00",
      "note": "The category specs as committed at the last commit before the next version was recorded."
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    },
    "formula": {
      "step1_weightedTotal": "weightedTotal = (SUM over dimensions of (breakdown[d] / baseWeight[d]) * weight[d]) / (SUM of weight[d]) * 106",
      "step2_absoluteScore": "absolute = weightedTotal <= 20 ? round(40 + weightedTotal) : round(60 + (weightedTotal / 106) * 38), clamped to [40, 99]",
      "step3_poolRelative": "score = round(min(min(99, max(41, leaderScore - (leaderWeighted - weightedTotal) * 2.6)), scoreOfRowAbove))",
      "note": "boundBy names which limit decided the number when one did: floor, ceiling, row-above, or none. Rows marked floor sit at 41 and the multiplication alone gives a lower figure.",
      "baseWeights": {
        "availability": 20,
        "objectiveFit": 30,
        "profileFit": 20,
        "frictionFit": 10,
        "trustBonus": 8,
        "quantitative": 18
      },
      "weightVersusInfluence": "A base weight is how much a dimension COULD move a score, not how much it did. Each category publishes dimensionSpread: the range that dimension actually covered across its pool. A spread of 0 means the dimension was constant there and decided nothing, however large its weight.",
      "totalBaseWeight": 106,
      "spreadPerWeightedPoint": 2.6,
      "scoreFloor": 41,
      "scoreCeiling": 99
    },
    "recipe": "sha256 is the SHA-256 of the category spec (the file's \"spec\" field) written as compact JSON: every object's keys sorted, no spaces or line breaks, non-ASCII characters as UTF-8 (not escaped), no trailing newline. That is the serialisation of the rankings digest."
  },
  "rankings": {
    "ledger": "https://chainchoice.io/data/rankings-ledger.jsonl",
    "produced": [
      {
        "seq": 1236,
        "rankingsDigest": "08ec41b26b7096d828662ee54e2db99b4b3df72115f2e182480c468755ba549e",
        "ob": "2026-09-02",
        "src": "git:cd537763a277bcbbf61396369e199fd47f18a128",
        "engine": "2026.09.1"
      }
    ],
    "whenIntroduced": "08ec41b26b7096d828662ee54e2db99b4b3df72115f2e182480c468755ba549e",
    "whenSuperseded": "08ec41b26b7096d828662ee54e2db99b4b3df72115f2e182480c468755ba549e",
    "newest": null,
    "note": "produced lists the ledger's digest entries whose rankings.json was generated while this version was the newest changelog entry (seq is the entry's place in the ledger). whenIntroduced and whenSuperseded are the digests of the rankings.json committed with the first and the last commit of this version."
  },
  "gaps": [],
  "notes": []
}