Probe a public endpoint without paying, grade its x402 v2 challenge, check exact
Probe a public endpoint without paying, grade its x402 v2 challenge, check exact-host x402-list presence and traction, and optionally rank licensed market matches with buyer-concentration caveats.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
340 msmedian answer time
$0.05listed price per call
$0.05price 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://apiacre.com/v1/developer/x402-preflight
| Category | Code and developer |
|---|---|
| Provider host | apiacre.com |
| 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 |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.05 | 340 ms |
Example input (from the provider)
{
"body": {
"body": {
"document": "{\"openapi\":\"3.1.0\",\"info\":{\"title\":\"Example\",\"version\":\"1...",
"format": "json"
},
"market_limit": 1,
"market_query": "audit",
"method": "POST",
"url": "https://apiacre.com/v1/developer/openapi-audit"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"body": {
"anyOf": [
{
"type": "object"
},
{
"type": "null"
}
]
},
"market_limit": {
"type": "integer"
},
"market_query": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
},
"url": {
"type": "string"
}
},
"required": [
"url"
],
"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": {
"properties": {
"data": {
"properties": {
"checkedAt": {
"type": "string"
},
"checks": {
"items": {},
"type": "array"
},
"compliant": {
"type": "boolean"
},
"directoryEvidence": {
"type": "object"
},
"elapsedMs": {
"type": "integer"
},
"finalUrl": {
"type": "string"
},
"grade": {
"type": "string"
},
"gradeVersion": {
"type": "string"
},
"limitations": {
"type": "string"
},
"method": {
"type": "string"
},
"payment": {
"type": "object"
},
"remediation": {
"items": {},
"type": "array"
},
"score": {
"type": "integer"
},
"statusCode": {
"type": "integer"
},
"url": {
"type": "string"
}
},
"type": "object"
},
"meta": {
"properties": {
"cached": {
"type": "boolean"
},
"duration_ms": {
"type": "integer"
},
"next_actions": {
"items": {
"type": "object"
},
"type": "array"
},
"sources": {
"items": {
"type": "string"
},
"type": "array"
},
"warnings": {
"items": {
"type": "string"
},
"type": "array"
}
},
"required": [
"duration_ms",
"cached",
"sources",
"warnings",
"next_actions"
],
"type": "object"
},
"request_id": {
"type": "string"
},
"service": {
"type": "string"
},
"version": {
"type": "string"
}
},
"required": [
"request_id",
"service",
"version",
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}