Evidence row 566449

What was observed

{
  "count": 6,
  "tools": [
    {
      "description": "Full paid due-diligence audit of an x402 merchant: live probe, price-drift detection between advertised and actual challenge price, settlement history, unique buyer count, and on-chain verification that USDC actually reaches the payTo address. Returns PASS/CAUTION/AVOID with evidence. Costs $0.01 USDC via x402 — returns payment instructions if called without payment.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "url": {
            "description": "Absolute https URL of the x402 resource to audit.",
            "type": "string"
          }
        },
        "required": [
          "url"
        ],
        "type": "object"
      },
      "name": "x402_audit_merchant"
    },
    {
      "description": "Check whether an x402 endpoint is alive and emits a valid HTTP 402 payment challenge, before you pay it. Free liveness check. Returns reachability, status code and whether a valid challenge was found.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "url": {
            "description": "Absolute https URL of the x402 resource to check.",
            "type": "string"
          }
        },
        "required": [
          "url"
        ],
        "type": "object"
      },
      "name": "x402_check_endpoint"
    },
    {
      "description": "Which x402 facilitators actually settle payments, measured by probing each with a real signed EIP-3009 payload. Tells you which are keyless, which need API keys, which are testnet-only and which are unreachable. Free. Use before choosing a facilitator.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "x402_facilitator_guide"
    },
    {
      "description": "Current gas price and estimated simple-transfer cost for an EVM chain. Free preview route. Supports base, polygon, arbitrum, optimism, ethereum.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "chain": {
            "description": "Which chain to query. Defaults to base.",
            "enum": [
              "base",
              "polygon",
              "arbitrum",
              "optimism",
              "ethereum"
            ],
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "x402_gas_price"
    },
    {
      "description": "Get measured statistics about the x402 ecosystem economy: total 30-day revenue across sampled resources, revenue concentration, revenue at a given rank, price distribution and payer concentration. Free. Use this to decide whether building or buying on x402 is worth it.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "x402_market_stats"
    },
    {
      "description": "List x402 merchants that have been VERIFIED to accept payment — each one actually paid with real USDC on Base, with the settlement transaction hash. This is different from a liveness probe: public censuses only check whether a 402 is emitted, not whether paying works. Use this to find endpoints that will actually serve you. Free.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "x402_verified_merchants"
    }
  ]
}

What the leaf hashes

{"body":"58b39b1fc65ca33192a7b9ba3108261022375b1b3f9c4684198cb973aad0a60f","id":566449,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793138445119138,"prev":null,"subject":"52557d79-272f-472d-b5cd-feba12803952","subject_kind":"endpoint"}

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. 0x058e6b505aeca7dbc106d32205be3e7c5f2699984e2995409e2f343df56b78ab
2. 0x69f127795c8a5f091516ff47a46f273694d4adb353ae8364d003b9fcbe98dcf6
3. 0x1176906c42b7c1a76b4d15ceaeaddd97c9766c42bd291f73456a1854ac39330b
4. 0xdbc4ce274510a9aafc76dbdec2e71c41dda14b6ec209b01b102abc81c1f9117f
5. 0x4a54d7aecd4d6de5c99b5e58ce37be4f2cc9fb2e0fb6e84080fef25b7e9789e2
6. 0x7c2ebcba5c9e8f55e226dded8160bed960464bdce5529a8f08c85cce01425049
7. 0x5292150b7c9a78a10f9f751e34e5536e647816eb517fb21c2ebafda52bdad6d2
8. 0x4e463efd4b44b459c04a1cc0573bdbf91461c8d2ac34f71398e86cb1db075960
9. 0x1b81879bd19f0a548b0712e40ae8bfdc26f0f190b97f7e3443d92baa47402191
10. 0xb27ac0d01327baad8d269ce2b075ef31dd979ff9449edcae844018feed87c9f6
11. 0xe9db0158b4c259b87fc427fe2d76b9a481e59053039dd07a06261cfea061d5f8
12. 0x6d7e35c9db9477d49c0dca0654b8a6378e19a394f96efba2061b6ef0ea5355fe
13. 0x7e8c79bd0dee073006d03de64eaf1047d3bfd30041ac4fc765479ffd5a092e62
14. 0x29e12cb67839430fa64ab8bd05d52bab606f2978d9e6d2fb094fece9438fd4de
15. 0x2cf27e8a181d60d0dd27c186c2eddfcbb4e8fa71cf66feeb55a4d730e15ee8c4
16. 0x518b93854db03dc9fc938883abf30da6eaae5ae0d4336903968fd32a7df8c71b
17. 0x22c1fb9487ee0b9732fa017a0cc321eb27a60c08450d112f755089796e12cb1c
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4