Evidence row 19873

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": 1792977591,
          "quote_id": "8b6df97975c44cceb7a0e8bea753cb86",
          "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": "2026-10-26T01:14:51.545Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-10-26T01:14:51.322Z"
    },
    "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":"f26a6e690fa56523582079a106639e6209a29851f80984cb2ee0ecf609511565","id":19873,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793025332196033,"prev":null,"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 2026-10-26 (296695 rows).

1. 0x264bb2a9dae7c762b4a7e35a1349ec5aa88fade66c76d101fad51cd0f4d2ae39
2. 0xea30260d2bf280db4ae9977cefd52223e67f13f502c330132039ef8eb9f27690
3. 0x10d501b4340635f3460d840913cae7cfe920d4721cd6684019198ded79671771
4. 0x14b2f177709d4a0a47d291a56990f86b601a4f90f4f9440de4dc168bcf319da1
5. 0x4a57954cc1955d2838b8acd56e6dbf9d2229701f063e9fcde132707bb94f089b
6. 0xa4f4f9720b443d647b665ce081baa57b75f59316e8212be104c6b63145bfc5d9
7. 0x1dca628a9a6964004485ff778a2d828dcbab4e43d8f68fcadf9fc98ed5f0f7d9
8. 0xf5b6ede652a764034fde0c7bd8154ab87f35e0d6e60b172059750d62af284f01
9. 0xeac39e1a0ebecf6a1aabde93560176deeaf9d6126348ff76ef10cd221e99e21c
10. 0x1dad1edcb2a79dd2d06559e438975ccfdf5ae3c94d461c1d78f86118f235991b
11. 0x90f2b3a28efa276421488834f526df2e5769ef8f14ee569439eea7b97f77a866
12. 0x266d991b0a994042474d2789bd5d3ba2433a122ae3c1027e2ccd7c0f4cf63071
13. 0x830b2c874449c7499489eba2baa67d49f991298225763c0161b471621038d0fb
14. 0xd843afcced75dedd39194ff9bd12326b88099e6112686db2299392d022dc3146
15. 0xc3a6a3ae44ec0da1848b16d40c45d7aac97a67352eea8df18e0f26edabea8a2f
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae