Evidence row 64456

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://apexrunner.ai/signals/arb-spread"
    ]
  ],
  "name": "apexrunner.ai/signals/arb-spread",
  "owner_address": "0x8d0663bbb967ebf1c047405a888ddf865f3e8854",
  "raw": {
    "accepts": [
      {
        "amount": "7000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxAmountRequired": "7000",
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0x8D0663BBb967ebF1c047405A888DDf865f3E8854",
        "scheme": "exact"
      }
    ],
    "description": "APEX Runner: Arb Spread Signal",
    "extensions": {
      "bazaar": {
        "category": "trading-signals",
        "description": "Cross-exchange arbitrage spread between Kraken and Hyperliquid for BTC and ETH. Returns live price spread %, net spread after fees, and arb viability flag for cross-exchange arbitrage execution.",
        "example": {
          "hl_price": 62380,
          "kraken_price": 62450,
          "pair": "BTC/USDC",
          "spread_pct": 0.11,
          "viable": false
        },
        "info": {
          "input": {
            "method": "GET",
            "type": "http"
          },
          "output": {
            "example": {
              "hl_price": 62380,
              "kraken_price": 62450,
              "pair": "BTC/USDC",
              "spread_pct": 0.11,
              "viable": false
            },
            "hl_price": "float — mid-price on Hyperliquid at time of snapshot",
            "kraken_price": "float — mid-price on Kraken at time of snapshot",
            "pair": "string — asset pair being compared (e.g. BTC/USDC)",
            "spread_pct": "float — gross spread as a percentage of price",
            "type": "json",
            "viable": "boolean — true when net spread exceeds estimated round-trip fees"
          }
        },
        "name": "Arb Spread Signal",
        "outputSchema": {
          "hl_price": "float",
          "kraken_price": "float",
          "pair": "string",
          "spread_pct": "float",
          "viable": "boolean"
        },
        "schema": {
          "properties": {
            "input": {
              "properties": {
                "queryParams": {
                  "properties": {},
                  "type": "object"
                }
              },
              "required": [
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "_apex": {
                      "properties": {
                        "evolution_runs": {
                          "type": "integer"
                        },
                        "instance": {
                          "type": "string"
                        },
                        "live_capital_deployed": {
                          "type": "boolean"
                        },
                        "live_trading": {
                          "type": "boolean"
                        },
                        "signal": {
                          "type": "string"
                        },
                        "signal_hash": {
                          "type": "string"
                        },
                        "source": {
                          "type": "string"
                        },
                        "trades_backing_signal": {
                          "type": "integer"
                        },
                        "trades_backing_signal_as_of": {
                          "type": "string"
                        },
                        "trading_status": {
                          "type": "string"
                        },
                        "verify_at": {
                          "type": "string"
                        },
                        "version": {
                          "type": "string"
                        }
                      },
                      "type": "object"
                    },
                    "computed_at": {
                      "type": "string"
                    },
                    "data_age_seconds": {
                      "type": "integer"
                    },
                    "max_age_seconds": {
                      "type": "integer"
                    },
                    "pairs": {
                      "additionalProperties": {
                        "properties": {
                          "action": {
                            "type": "string"
                          },
                          "arb_viable": {
                            "type": "boolean"
                          },
                          "cex_price": {
                            "type": "integer"
                          },
                          "direction": {
                            "type": "string"
                          },
                          "gross_spread_pct": {
                            "type": "number"
                          },
                          "hl_price": {
                            "type": "number"
                          },
                          "threshold_pct": {
                            "type": "number"
                          }
                        },
                        "type": "object"
                      },
                      "type": "object"
                    },
                    "stale": {
                      "type": "boolean"
                    }
                  },
                  "type": "object"
                }
              },
              "type": "object"
            }
          },
          "type": "object"
        },
        "version": "1.0.0"
      }
    },
    "lastUpdated": "2026-10-23T02:09:23.666Z",
    "quality": {
      "l30DaysTotalCalls": 37,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-23T02:09:23.527Z"
    },
    "resource": "https://apexrunner.ai/signals/arb-spread",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "APEX Runner: Arb Spread Signal"
}

What the leaf hashes

{"body":"750d04a10e6e21a9b3db78d02c19078e9b2742d6d39123e0497b0b75fc20d335","id":64456,"kind":"listing","method":"baseline/1","observed_us":1793025456660958,"prev":null,"subject":"x402_bazaar:https://apexrunner.ai/signals/arb-spread","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0x5d311c71152b2134ddc84dc6b41c3039ebe0d8845987632fec4b5ca3cbf3f1fd
2. 0x121fc1bb50308aa60feb263e4eaa5da8acb416445099b68ba7c961f3de40b146
3. 0x8bef8f3d58123ca6df1221a6c5e1cbe2ab55aa3cab28b2c3c4085aa01188d7d9
4. 0xedaf6da84f95da529f093926f8b8bfdd9193fd8a767fd4f14544a588ee9191f4
5. 0x63b9c4d6f0fba84c00609ce520083ba63813dbc084bed3d4c9ba88f67337cd94
6. 0xa2cdc77c8ec2037a01e414d724884eb94a242d904e03bce56b1f3c4ec1832284
7. 0xa43f72ad748626b989e9ac431abccfce26ff4ac374654bb5723dd10c6e6f93d0
8. 0xf5c626e30e4ade9fc33b819ed022da91a7247d7a9ceef2ac7016e313ebdcf239
9. 0xe83b2a73139a45ac5e787f5f8d00e2fdb51ec0acd6751a60cbf0f65dfcfc455f
10. 0x71c75f9312be1c838a554f724b6fc57894e7c4486ab7e013b6a6a8d65cfaebea
11. 0xb91bf0ba3ebff769d1b88f93fcb076477149787a7e31c3c28ce4fe8823b7c144
12. 0x2121cc2dbcb8663af57743dc445c8a59e5bbfffe89703f0606c9843f0d35aff8
13. 0x66883b42f4167ade51c4909f050c5478524e23786fb0b5c48bd1a53580960a68
14. 0x216cebb9ae5414599109a02297c4817d7d1c6b1394afeb97efe38e32f0053974
15. 0x7726154b91b2ad65b13849ef6cb6443b1f0ff113a3089c9bd5f2bcfc16be099d
16. 0x47b89901b0f07938a6b9a66ddf35683903f79d756a7c7763665fd632758b08d0
17. 0x9a83be955a206deb65b995adfd92c58fa31c95fbbf926bd199d300e70b08b26d
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae