{
  "license": "CC-BY-4.0",
  "licenseUrl": "https://creativecommons.org/licenses/by/4.0/",
  "attribution": "ChainChoice (https://chainchoice.io)",
  "url": "https://chainchoice.io/data/methodology/2026.09.8.json",
  "version": "2026.09.8",
  "status": "archived",
  "publishedAt": "2026-09-13",
  "title": "dYdX is no longer shown as available where its own terms restrict it",
  "supersededBy": "2026.09.9",
  "previous": "2026.09.7",
  "changelog": {
    "url": "https://chainchoice.io/methodology/changelog/archive#v-2026.09.8",
    "entry": {
      "version": "2026.09.8",
      "publishedAt": "2026-09-13",
      "title": "dYdX is no longer shown as available where its own terms restrict it",
      "summary": "dYdX carried supportedRegions ['us', 'europe', 'global'] — a literal 92 catalog rows share — with no availability note, so a reader in the United States or the United Kingdom was told a leveraged derivatives venue was eligible for them. dYdX’s help centre (updated 23 April 2026) lists the United States, Canada and the United Kingdom as restricted jurisdictions for the frontends dYdX Operations Services Ltd. operates. The record now quotes that page, names those markets as restricted, and drops the US tag.",
      "rationale": "Only the restriction a source states was applied. Eleven other perp_dex rows and eight options_vaults rows carry region tags with no sourced note; their venues publish terms only inside JavaScript apps, and a restriction list typed from a search snippet would be the invented fact this catalog refuses. They are counted by a test that may only fall (19 today) and queued for re-reading.",
      "affectedCategories": [
        "perp_dex"
      ],
      "changes": [
        {
          "type": "fixed",
          "description": "dYdX: restrictedMarkets United States, Canada, United Kingdom, from help.dydx.trade (read 2026-09-13); supportedRegions [us, europe, global] → [europe, global]."
        },
        {
          "type": "changed",
          "description": "Personalised perp_dex runs for US, UK and Canadian readers no longer rank dYdX. The published ranking is unchanged in all 119 categories, and no golden case moves (the golden set has no US or UK perp_dex reader)."
        },
        {
          "type": "added",
          "description": "tests/leverage-availability.test.ts: dYdX is excluded for US, GB and CA and kept for DE; leverage rows with an unsourced region tag may only fall from 19."
        }
      ],
      "approvedBy": "mathias-siemonsmeier"
    }
  },
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      "at": "2026-09-13T20:57:34+02:00",
      "note": "The category specs as committed at the last commit before the next version was recorded."
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      "at": "2026-09-13T19:44:14+02:00"
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    "specCommitsAfterIntroduction": 0,
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      "stablecoin_settlement": {
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      "stablecoins": {
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        "sha256": "dd1fa4b50485f0d2524a01f61da473bb97027e2cd1b6f63ca01fa859cb4aff75",
        "url": "https://chainchoice.io/data/methodology/category/stablecoins.dd1fa4b50485f0d2.json"
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      "structured_products": {
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      "subscriptions": {
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      "tax_software": {
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      "tokenisation_platforms": {
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        "sha256": "2d08625c03372a57924a4188221c9cee49f087e391258f774b6b8bdd9c262b6a",
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      "tokenised_bonds": {
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        "sha256": "a75909802498788cf0df714c8faaea1af2f29a1f3442f46c829617026dd84ddb",
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      "tokenised_commodities": {
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      "tokenised_funds": {
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      "trading_bots": {
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        "url": "https://chainchoice.io/data/methodology/category/trading_bots.796dc798321fd46c.json"
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      "trading_tools": {
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        "url": "https://chainchoice.io/data/methodology/category/trading_tools.90723c470dd26c29.json"
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      "transaction_simulation": {
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        "url": "https://chainchoice.io/data/methodology/category/transaction_simulation.0c64054486715df9.json"
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      "travel_rule_compliance": {
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        "sha256": "d7847a6c8b3fb39947868fd2c31978af216898427127a7e07ae3d9091d9d6ebb",
        "url": "https://chainchoice.io/data/methodology/category/travel_rule_compliance.d7847a6c8b3fb399.json"
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        "specVersion": "2026.08",
        "sha256": "5d3c3db6fb31e9883ad3fb699ac70c5aac22eae3df009e3253da17242606ae01",
        "url": "https://chainchoice.io/data/methodology/category/wallet.5d3c3db6fb31e988.json"
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      "wallet_screening": {
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        "url": "https://chainchoice.io/data/methodology/category/wallet_screening.5127ae5ba6779ffb.json"
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        "sha256": "17c4b2ec1128628d7ac853b31206630e1e9e71d928342811fbc53e09418c53c7",
        "url": "https://chainchoice.io/data/methodology/category/web3_apps.17c4b2ec1128628d.json"
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        "sha256": "f3fad21723fd154b6c6762aa003c0e52809c8a3aa8c0678207ac33cd82549dd8",
        "url": "https://chainchoice.io/data/methodology/category/wrapped_assets.f3fad21723fd154b.json"
      },
      "yield_aggregators": {
        "specVersion": "2026.08",
        "sha256": "5f929dd0ebc40f84d17b6731550efcc10dbdae7cafd71ce0e8cd1abaea61d302",
        "url": "https://chainchoice.io/data/methodology/category/yield_aggregators.5f929dd0ebc40f84.json"
      },
      "yield_vaults": {
        "specVersion": "2026.08",
        "sha256": "14dc93f329c5af144155592d8ce86000140c5d7fea736e46b2345bae250a283a",
        "url": "https://chainchoice.io/data/methodology/category/yield_vaults.14dc93f329c5af14.json"
      }
    },
    "formula": {
      "step1_weightedTotal": "weightedTotal = (SUM over dimensions of (breakdown[d] / baseWeight[d]) * weight[d]) / (SUM of weight[d]) * 86",
      "step2_absoluteScore": "absolute = weightedTotal <= 20 ? round(40 + weightedTotal) : round(60 + (weightedTotal / 86) * 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,
        "frictionFit": 10,
        "trustBonus": 8,
        "quantitative": 18
      },
      "unweightedDimensions": [
        "profileFit"
      ],
      "unweightedNote": "These dimensions are computed and published in every breakdown but carry no weight in the total. profileFit left the composite in methodology 2026.09.2: it was constant inside all 114 categories, so its 20 points moved every product in a pool identically and ordered nothing. Sum the breakdown against baseWeights and the unweighted terms are simply absent from the arithmetic — that is the intended reading, not an omission.",
      "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.",
      "objectiveBasis": "Each product names where its objectiveFit points came from. \"criteria\": the block is the weighted sum of the published criterion cells, round(min(30, 0.75 × Σ weight × cell/10 × 32)), and a pairwise ledger can itemise it per criterion. \"whole\": the category scores the block from structural facts or capability flags rather than per-criterion cells, so it enters a ledger as one term. \"sunset\": the product no longer operates (sunsetAt gives the date) and the block is zeroed regardless of its cells.",
      "totalBaseWeight": 86,
      "spreadPerWeightedPoint": 2.6,
      "scoreFloor": 41,
      "scoreCeiling": 99,
      "leaderRobustnessNote": "leaderSurvivesOnePointChange: whether this category keeps its #1 when any single criterion score moves by one point on the 0-10 scale — the smallest difference two competent raters can hold. False in 39 of 118 categories. A false does not mean the ranking is wrong; it means the evidence separates the top two by less than the width of a judgement call, and the file says so rather than letting the displayed gap imply otherwise. null means the sweep could not run — too few criteria or too small a pool — and is deliberately not reported as robust."
    },
    "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": [],
    "whenIntroduced": "4cc01c5a73737e6327397cf9b9151e042678ecb3aff5eada6e08412b823db518",
    "whenSuperseded": "4cc01c5a73737e6327397cf9b9151e042678ecb3aff5eada6e08412b823db518",
    "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": [
    "No rankings.json with a digest of its own was recorded while this version was the newest entry: the published file did not change under it, so the order in force was the one recorded before it."
  ]
}