Evidence row 2202094

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://color-design.x402tookit.com/contrast-fix"
    ]
  ],
  "name": "Color and Design Tools",
  "owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
  "raw": {
    "accepts": [
      {
        "amount": "20000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
          "transactionVersions": [
            0
          ]
        },
        "maxTimeoutSeconds": 300,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:137",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:42161",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      }
    ],
    "description": "Adjust a text color's lightness just enough to reach a WCAG contrast target (4.5, 3 or 7) on a background, keeping its hue.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "background": "ffffff",
              "foreground": "ffcc00",
              "target": 4.5
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-11T04:02:41.011Z",
              "background": "#ffffff",
              "contrastAfter": 4.59,
              "contrastBefore": 1.512,
              "degraded": false,
              "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
              "fixed": "#8f7200",
              "lightnessShift": 22,
              "notChecked": [
                "brand guidelines",
                "non-text contrast",
                "…1 more"
              ],
              "original": "#ffcc00",
              "reasons": [
                "Same hue and saturation; only lightness changes, in the direction that increases contrast."
              ],
              "source": "computed locally",
              "summary": "Use #8f7200 instead of #ffcc00: contrast 1.51:1 becomes 4.59:1 (target 4.5:1), lightness moved 22 points.",
              "target": 4.5,
              "verdict": "FIXED"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "background": {
                      "description": "Background hex",
                      "type": "string"
                    },
                    "foreground": {
                      "description": "Text color hex",
                      "type": "string"
                    },
                    "target": {
                      "description": "Contrast target: 3, 4.5 (default) or 7",
                      "type": "number"
                    }
                  },
                  "required": [
                    "foreground",
                    "background"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "background": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "contrastAfter": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "contrastBefore": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "fixed": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "lightnessShift": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "original": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "target": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T22:42:51.309Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T22:42:51.146Z"
    },
    "resource": "https://color-design.x402tookit.com/contrast-fix",
    "serviceName": "Color and Design Tools",
    "tags": [
      "color",
      "accessibility",
      "contrast"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Adjust a text color's lightness just enough to reach a WCAG contrast target (4.5, 3 or 7) on a background, keeping its hue."
}

What the leaf hashes

{"body":"b34832eb852486e9db3273b051ddd884a3f39a3c760d60da748af10abcfb45a3","id":2202094,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646812469868,"prev":null,"subject":"x402_bazaar:https://color-design.x402tookit.com/contrast-fix","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-02 (444186 rows).

1. 0x56a230ae31dcb720371e73c42816799bc35bf0ee29bacc8812a939b1ba880fa4
2. 0xd4ec34678131d829cb898e91797fa245550ec4a2e744c6e2e994c24e9eb7e643
3. 0x4141ba520956f1407271dc6c1488ae13c72f3d1ba809df3b7b7470a34cba4c78
4. 0xf4535ab49a68a5edcf4972b722b4842049b68b385859858ea314848e4f861793
5. 0x1285b67b66b70fe7207bd8b710375a03e4f985e2971386f93eae08a466251399
6. 0xc975d38aac2876fba7a170f1652da077f291bf0da28481c83117fe6d059990bf
7. 0xffa4f0eae3669d5a796cb53f97f5f39812c745338b11d0977b72b7ea6ffb2beb
8. 0xbc9faef1b7f4f2069e81a7bb3d61585857f7620b375f2217f4890ba5dc031e21
9. 0xc1746368e03290d7f1a68573662f75b4e505ef592621229ac1ee1e97f295d366
10. 0x929aae4352713617339e1b0be3303bd4a528521a1eb34675022716ba5ec98145
11. 0xe95dfdaf0a3d21e6793524d1d8ed021601cde70c58ba543e75fede0fd55406af
12. 0x2727e7c2336a75a0876e84ae6f327ace6742a4c51a4090c4df7b9a7d293da742
13. 0xb5b32de12fac3b68a23088b6007f1052bd84011d7da80663c8664b4a4c7bcebf
14. 0xc73349c9955998a166e6e5920ac8ee0aa7bc6c9d66bace60f6dbd465dd9e0530
15. 0x52242d46cadab5f421a6f86c1edc6379b085ae98482fa80904e4a3028c1849a3
16. 0x1068659ec8f2bcf26e4ad39786557a8c45d60e5ebba4fce2fb9962b2c9c59920
17. 0xf9973981f80219d4f00fa9186b40a8144accc0c9875572fb79eaea312a21a187
18. 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af