← The evidence ledger
Evidence row 67368
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://api.mekler.ai/v1/services/listings/list-grade-changes
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- e2175065501ae9017f1c014ca871ea62afa3400362046c5ca5769e066797d512
- Leaf
- 0xf873cd83d6d6701246b3cca6933f069ece4bb67cd82a8adc5772f216b60dd231
What was observed
{
"endpoints": [
[
"x402",
"https://api.mekler.ai/v1/services/listings/list-grade-changes"
]
],
"name": "Mekler AI",
"owner_address": "0xf6c6e2e530bb311c14a49c1a07c720fc232c07c5",
"raw": {
"accepts": [
{
"amount": "10000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
"meklerQuote": "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.1f8b0c71cad0089aeb8131dbdb5fdeab6460395590dbbe5423eddf2bb592ce05",
"memo": "m:H4sMccrQCJrrgTHb21_eqw"
},
"maxTimeoutSeconds": 60,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "9mMDrHabSf73MPn1ANdANSmsNw2wKiqE7JZ7eD6EUSRc",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"assetTransferMethod": "eip3009",
"meklerQuote": "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.2c28bc77882e8466fc3620d1c377ae47b88aeda4b339bc7ee94d852ca13e5497",
"name": "USD Coin",
"version": "2"
},
"maxTimeoutSeconds": 60,
"network": "eip155:8453",
"payTo": "0xF6c6E2e530bb311c14a49C1a07C720fc232c07c5",
"scheme": "exact"
}
],
"description": "Read ordered new, grade_changed and rescanned events with previous grades and scores. Default 200, maximum 1000; signed watermark cursors. History retains 30 days or 50000 events; expired cursors return 410. Costs 0.01 USDC per page on Base or Solana. Use a fresh idempotency key per page; retain the original body and proof for exact recovery.",
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"idempotency_key": "example-grade-request-0001",
"limit": 200
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"event_cap": 50000,
"events": [],
"has_more": false,
"history_floor": 0,
"next_cursor": "synthetic-cursor-replace-with-actual-response",
"retention_days": 30,
"status": "ok",
"watermark": 0
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"cursor": {
"maxLength": 2048,
"type": "string"
},
"idempotency_key": {
"maxLength": 128,
"minLength": 22,
"pattern": "^[A-Za-z0-9_-]{22,128}$",
"type": "string"
},
"limit": {
"default": 200,
"maximum": 1000,
"minimum": 1,
"type": "integer"
}
},
"required": [
"idempotency_key"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"event_cap": {
"const": 50000
},
"events": {
"items": {
"additionalProperties": false,
"properties": {
"at": {
"type": "integer"
},
"grade": {
"enum": [
"A",
"B",
"C",
"D",
"F",
null
],
"type": [
"string",
"null"
]
},
"listing_id": {
"pattern": "^[a-f0-9]{64}$",
"type": "string"
},
"previous_grade": {
"enum": [
"A",
"B",
"C",
"D",
"F",
null
],
"type": [
"string",
"null"
]
},
"previous_score": {
"maximum": 100,
"minimum": 0,
"type": [
"number",
"null"
]
},
"published_at": {
"type": "integer"
},
"report_id": {
"pattern": "^[a-f0-9]{64}$",
"type": "string"
},
"scan_observed_at": {
"type": "integer"
},
"score": {
"maximum": 100,
"minimum": 0,
"type": [
"number",
"null"
]
},
"sequence": {
"minimum": 1,
"type": "integer"
},
"type": {
"enum": [
"new",
"grade_changed",
"rescanned"
]
}
},
"required": [
"sequence",
"type",
"listing_id",
"at",
"published_at",
"scan_observed_at",
"report_id",
"grade",
"score",
"previous_grade",
"previous_score"
],
"type": "object"
},
"maxItems": 1000,
"type": "array"
},
"has_more": {
"type": "boolean"
},
"history_floor": {
"type": "integer"
},
"next_cursor": {
"type": "string"
},
"retention_days": {
"const": 30
},
"status": {
"const": "ok"
},
"watermark": {
"type": "integer"
}
},
"required": [
"status",
"events",
"has_more",
"next_cursor",
"watermark",
"retention_days",
"event_cap",
"history_floor"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-10-19T18:21:44.497Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-10-19T18:21:44.33Z"
},
"resource": "https://api.mekler.ai/v1/services/listings/list-grade-changes",
"serviceName": "Mekler AI",
"tags": [
"x402",
"catalog"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Read ordered new, grade_changed and rescanned events with previous grades and scores. Default 200, maximum 1000; signed watermark cursors. History retains 30 days or 50000 events; expired cursors return 410. Costs 0.01 USDC per page on Base or Solana. Use a fresh idempotency key per page; retain the original body and proof for exact recovery."
}What the leaf hashes
{"body":"e2175065501ae9017f1c014ca871ea62afa3400362046c5ca5769e066797d512","id":67368,"kind":"listing","method":"baseline/1","observed_us":1793025462663796,"prev":null,"subject":"x402_bazaar:https://api.mekler.ai/v1/services/listings/list-grade-changes","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).
- 0xf873744dee7dd80452603db06899ea3aec9e1da0bb8d9ad0fa095530d0864d8c
- 0x5541d444cac419afded9b9dcae7ceae606d34b0f37454d38299858b35e6653b8
- 0xaf10d342797e1c3db7dd9206f9979e4d2325abf97de4e90224cb86faa644a696
- 0xfa25be92a583a571fcb52beb599c0a3d6e680750a89c38b0e12ebd8dd4ece328
- 0xffee05988ab0851d3a6781fe06bc51d0b8e54cd4fbf317a1e96cdd612c992810
- 0x0e923b340259eae23deec8f0e69d25342a84933e866123dbd4dae343d0a128e9
- 0x3bb86c0efab6b6fd6946b2a3e2c0bb8db8e8e837da3f6aab2e030fa04f4079dc
- 0x5f885a026b10d7405bc704cb4bfe296049a874f07c38fd50a9a9cec2a0d84f00
- 0x60c913cb9f6ab365a73091fed8c4efa74ad0caddec29ccd05cb049370255c742
- 0xedbb756c6884e1e4b4d8aa27e3c5a9118300a1c763d183c08ab09c58ee11482f
- 0xe3be477672f672ad65922159dceef6444408759f2808a7a1e1ba87146cf5eee0
- 0xf7eba200f6f1012d700fcc53fc6d57dcafd1019c920b1030d42fa21d4af95d94
- 0x694eb701ea36a0e3dcde192253ab85a618738bdc1e3a6e582e6f8bf9647f7a6a
- 0x44945ea9ad8b24e723ad5a8fd6d014024a49531783f74ff9229c2ab6930e84c8
- 0x68d296b1e00b4899fb83c3fba36fffaefa311eac2903067dbebfe776a12b4a9a
- 0x5fb5dda563336cd1bc1b9f44c52b76237ae72ed2145cb9290f39f304ca7dd678
- 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae