Evidence row 425319

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://ontarioprotocol.com/api/x402/base/gas"
    ]
  ],
  "name": "Ontario Protocol",
  "owner_address": "0xa2d72abf2c5e939fddca4156b74de482e03ca3ec",
  "raw": {
    "accepts": [
      {
        "amount": "1500",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "quote_expires_at": 1793071407,
          "quote_id": "23d9542a13d942a594b833999ab01975",
          "resourceUrl": "https://ontarioprotocol.com/api/x402/base/gas",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xa2d72aBF2C5e939fdDCA4156B74dE482e03CA3ec",
        "scheme": "exact"
      }
    ],
    "description": "What does a Base transaction cost right now? Base fee, priority-fee p25/p50/p90 over the last 20 blocks, suggested maxFeePerGas and maxPriorityFeePerGas for slow, normal and fast inclusion, an L1 data-fee upper bound, and estimated total cost in wei for an ETH transfer and an ERC-20 transfer, read live from Base RPC with the block number. $0.0015 USDC on Base. Failed read, no charge. No account, no API key. Estimates, not inclusion guarantees. By Ontario Protocol.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "blocks": 20
            },
            "type": "http"
          },
          "output": {
            "example": {
              "assumptions": {
                "base_fee": "base fee of the next block",
                "blocks_sampled": 20,
                "erc20_transfer_gas": 65000,
                "erc20_transfer_unsigned_tx_bytes": 175,
                "estimate_formula": "gas * (base_fee + p50 tip) + L1 data-fee upper bound",
                "eth_transfer_gas": 21000,
                "eth_transfer_unsigned_tx_bytes": 110,
                "max_fee_formula": "2 * base_fee + priority_fee",
                "priority_fee_method": "median across the sampled blocks of each block's gas-weighted 25th, 50th and 90th percentile tip (eth_feeHistory)"
              },
              "base_fee_wei": "5000000",
              "block": 53049909,
              "estimate_includes_l1_fee": true,
              "estimated_total_wei": {
                "erc20_transfer": "390565949161",
                "eth_transfer": "126389167165"
              },
              "l1_fee_upper_bound_wei": {
                "erc20_transfer": "565949161",
                "eth_transfer": "389167165"
              },
              "network": "eip155:8453",
              "note": "Estimates, not inclusion guarantees. Wei amounts are decimal strings.",
              "priority_fee_wei": {
                "p25": "1000000",
                "p50": "1000000",
                "p90": "5800000"
              },
              "read_at": "2026-10-25T00:46:05Z",
              "schema": "ontario.base_gas.v1",
              "source": "Base RPC",
              "suggested": {
                "fast": {
                  "max_fee_per_gas": "15800000",
                  "max_priority_fee_per_gas": "5800000"
                },
                "normal": {
                  "max_fee_per_gas": "11000000",
                  "max_priority_fee_per_gas": "1000000"
                },
                "slow": {
                  "max_fee_per_gas": "11000000",
                  "max_priority_fee_per_gas": "1000000"
                }
              }
            }
          }
        },
        "schema": {
          "properties": {
            "input": {
              "properties": {
                "queryParams": {
                  "additionalProperties": false,
                  "properties": {
                    "blocks": {
                      "default": 20,
                      "description": "Optional number of recent blocks the fee percentiles cover, 5 to 50. Default 20.",
                      "maximum": 50,
                      "minimum": 5,
                      "type": "integer"
                    }
                  },
                  "type": "object"
                }
              },
              "required": [
                "queryParams"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "additionalProperties": true,
                  "type": "object"
                }
              },
              "required": [
                "example"
              ],
              "type": "object"
            }
          },
          "required": [
            "input",
            "output"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1792947859/bazaar-icons/8374ff393e7c4b50.png",
    "lastUpdated": "2026-10-27T03:18:27.892Z",
    "quality": {
      "l30DaysTotalCalls": 3,
      "l30DaysUniquePayers": 3,
      "lastCalledAt": "2026-10-27T03:18:27.599Z"
    },
    "resource": "https://ontarioprotocol.com/api/x402/base/gas",
    "serviceName": "Ontario Protocol",
    "tags": [
      "base gas price",
      "gas fee estimate",
      "maxFeePerGas",
      "base"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "What does a Base transaction cost right now? Base fee, priority-fee p25/p50/p90 over the last 20 blocks, suggested maxFeePerGas and maxPriorityFeePerGas for slow, normal and fast inclusion, an L1 data-fee upper bound, and estimated total cost in wei for an ETH transfer and an ERC-20 transfer, read live from Base RPC with the block number. $0.0015 USDC on Base. Failed read, no charge. No account, no API key. Estimates, not inclusion guarantees. By Ontario Protocol."
}

What the leaf hashes

{"body":"514e802514c0295845fe081d76b423e13247a2f366eb3a2bebb8cf367360e493","id":425319,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793086109370581,"prev":407516,"subject":"x402_bazaar:https://ontarioprotocol.com/api/x402/base/gas","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-27 (273461 rows).

1. 0xda17fc2b1da2b80a07fec838c6edb4b2a833402f51c7a8a7520a8d60a12f13d8
2. 0x402488b1ab0a6f0aacaaa875a2345cdd235d2b6a083d580819f4794dbc08b517
3. 0x81299850fa3ec31fe5e04e3507c1d49e565de0ae4f9d5f5e7876d2e23353d721
4. 0xa7cbf10a4e410d5a5b3eac8b53e772819673fc63ee3838c5d0e94d66e9fcc92e
5. 0x14df08d5734a6de19aa762d884ff25a32fa47cb650f2cc7535f403fcc42951fd
6. 0x88e98c2f33416a6b90da5298c014d60528eaeabbe12c86f362ab67c0ce023953
7. 0xea56f169797a3e79292e0e1bc38be2d0e89c84efeeed8d5cc3efa8bf0c091cfa
8. 0x2d97b7dadc9ba90797f6aa0e57924fbf67330555c1bec52632ad4707ef4e512d
9. 0x6bf1b819294261191256e8c33bb5f79f956f417a16afbaf610af94f0fdf109d8
10. 0xdc65632ba8f717775d73727335b362506eea0dbb2f72c31e86c99a58a8007610
11. 0x51d2dfffae7b5a32ea0581772134c7771ab69d32e784a62f9ee589642395fc86
12. 0x29ce226640d83db3bc63fef23427a7af561200d30ffde9b1b7a61b814b844a39
13. 0x13692b463800846f580925c8ea49b43f92b7df3f9e8d32b8a18802640cca3780
14. 0xd59f3e577867f5105dd7f75598f16da8286185e426dfcdafb84e733fde2b2492
15. 0x24e3e2bb8ee1e8d20756de35f0e0c4ec8eb1f193bd2cf3f077ee1f92f211c34d
16. 0x8745bd887f5ce9f7a49558fd2b04cdcd97a05ea9f8a23f62d0e80cb13d328b0f
17. 0xdf1105afdc109de3c09a98fc8a3864159ad964e6f49b635c105a27a1e1f14310
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4