Evidence row 2202099

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://color-design.x402tookit.com/accessible-text-color"
    ]
  ],
  "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": "Best text color (black or white) for a background hex color, with contrast ratios and WCAG AA/AAA results for both.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "background": "f4d03f"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-11T04:02:39.704Z",
              "background": "#f4d03f",
              "best": "#000000",
              "black": {
                "AA": true,
                "AAA": true,
                "AALarge": true,
                "ratio": 13.94
              },
              "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.",
              "notChecked": [
                "non-text elements",
                "a brand color that must stay as is (use /contrast-fix to adjust a text color instead)"
              ],
              "reasons": [
                "WCAG 2.x contrast: 4.5:1 for normal text (AA), 7:1 for AAA, 3:1 for large text."
              ],
              "source": "computed locally",
              "summary": "On #f4d03f use black text (13.94:1).",
              "verdict": "AAA_AVAILABLE",
              "white": {
                "AA": false,
                "AAA": false,
                "AALarge": false,
                "ratio": 1.51
              }
            },
            "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 color",
                      "type": "string"
                    }
                  },
                  "required": [
                    "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"
                      ]
                    },
                    "best": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "black": {
                      "properties": {
                        "AA": {
                          "type": [
                            "boolean",
                            "null"
                          ]
                        },
                        "AAA": {
                          "type": [
                            "boolean",
                            "null"
                          ]
                        },
                        "AALarge": {
                          "type": [
                            "boolean",
                            "null"
                          ]
                        },
                        "ratio": {
                          "type": [
                            "null",
                            "number"
                          ]
                        }
                      },
                      "type": [
                        "null",
                        "object"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "white": {
                      "properties": {
                        "AA": {
                          "type": [
                            "boolean",
                            "null"
                          ]
                        },
                        "AAA": {
                          "type": [
                            "boolean",
                            "null"
                          ]
                        },
                        "AALarge": {
                          "type": [
                            "boolean",
                            "null"
                          ]
                        },
                        "ratio": {
                          "type": [
                            "null",
                            "number"
                          ]
                        }
                      },
                      "type": [
                        "null",
                        "object"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T22:42:36.341Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T22:42:36.075Z"
    },
    "resource": "https://color-design.x402tookit.com/accessible-text-color",
    "serviceName": "Color and Design Tools",
    "tags": [
      "color",
      "accessibility",
      "wcag"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Best text color (black or white) for a background hex color, with contrast ratios and WCAG AA/AAA results for both."
}

What the leaf hashes

{"body":"5fa62f72c2fb4b5260c20aebdf30d612ca06b985c8660e1c0f47e2102821a19f","id":2202099,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646812490914,"prev":null,"subject":"x402_bazaar:https://color-design.x402tookit.com/accessible-text-color","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. 0x110ffb89ad51d6e0c3229f816ecfca80d8f4071ea7e14668821f0551dedb7925
2. 0x6263ecce94f77fa9f47148309c9cc5a551d8f6bd67aa55d8ebf062a2fa13cb58
3. 0x277586d173ce80b909d0697412c0fbf45853babbae51468295a8e4a47e70468e
4. 0x7290706465679dfca753c71baf9951158931311a10ed1844fb259413f3255aa7
5. 0xbcdfca5b1d207c952602dbcc9804f9ffbce033517e002013cc8241a009d6b8ff
6. 0x74c35148ec2b5eed1f63f4465ad9f6b8a9028cfbef11ade4646f21918799cab6
7. 0x9d337bacbce32b3c6d7bf0abd6564d8734d870929c23ece2058ad424c3c03a36
8. 0xc45ea48e8347ba1aa9f04aa5b86ba4ae9191e2148c50abd78133e95d64f724df
9. 0x9594712456fb0b88a06b1b8fe9b9ffe7da184b756efc1f6bb40e408a5d948a1d
10. 0xa0c98f8ad975f9a9f2feb429e8cd166af92707b7fb62211875e515efaa787e35
11. 0x53b5f0d40dcc042ae769956bb3fff7a7107519fd683ca90be375133b4b8417f3
12. 0x715a24b0f5dcc05977b0c3347c56e4c0b94bbc2f7d199d9d81cb44c4cf0d9324
13. 0x51686476d83f4be87192f4eeb7ac78473591bfaf5a92a1822648fcb019a95a83
14. 0x9914dfe331775bd1714304f757d2b6b43ba45167245d645ce50f54a3d8617c4d
15. 0xd82979c12a2aae44121bb6058b3364b3a3cbc9be411e35ab0208df5ed56f65d4
16. 0x7cb861d18f06406535ade133f716d897f27d257cf0121f99d94c78c713c4b54d
17. 0x53a741b69e9e51c4a288a74712aa6ac3fb28c8923cd3e6461d161c4f2d48b31a
18. 0x050f2978b537f7afb21ee1551577cdf146d1c56f4df12d24315ae5e69366b0a4
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af