Read ordered new, grade_changed and rescanned events with previous grades and sc
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.
Answeringour last check, 2026-10-20
1 of 1checks answered this week
753 msmedian answer time
$0.01listed price per call
$0.01price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.mekler.ai/v1/services/listings/list-grade-changes
| Category | Market data |
|---|---|
| Provider host | api.mekler.ai |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-20 | valid payment request | 402 | $0.01 | 753 ms |
Example input (from the provider)
{
"body": {
"idempotency_key": "example-grade-request-0001",
"limit": 200
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$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"
}