Check an x402 seller before you pay it
Check an x402 seller before you pay it: decode any public endpoint's 402 payment requirements without paying (v1 body or v2 header) into USD price for native USDC, network, asset, recipient, scheme and timeout, plus a listing-quality score for https resource URL, atomic amount, facilitator minimum, description, Bazaar metadata and output schema. Never signs. Use before buying from an unfamiliar seller or to audit your own x402 listing.
Answeringour last check, 2026-10-24
1 of 1checks answered this week
37 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
GET https://agent-data-tools.revmesh2074.workers.dev/x402/check
| Category | Code and developer |
|---|---|
| Provider host | agent-data-tools.revmesh2074.workers.dev |
| Networks | eip155:137, eip155:42161, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 3 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-24 | valid payment request | 402 | $0.01 | 37 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"url": "https://agent-data-tools.revmesh2074.workers.dev/btc-fees"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"url": {
"description": "Absolute public https URL of the paid endpoint, with any query it needs",
"examples": [
"https://agent-data-tools.revmesh2074.workers.dev/btc-fees"
],
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"accepts": {
"items": {
"properties": {
"amountAtomic": {
"type": "string"
},
"asset": {
"type": "string"
},
"assetIsNativeUsdc": {
"type": "boolean"
},
"maxTimeoutSeconds": {
"type": "number"
},
"network": {
"type": "string"
},
"payTo": {
"type": "string"
},
"priceUsd": {
"type": "number"
},
"scheme": {
"type": "string"
}
},
"type": "object"
},
"type": "array"
},
"checks": {
"items": {
"properties": {
"check": {
"type": "string"
},
"pass": {
"type": "boolean"
}
},
"type": "object"
},
"type": "array"
},
"paywalled": {
"type": "boolean"
},
"resource": {
"properties": {
"description": {
"type": "string"
},
"mimeType": {
"type": "string"
},
"url": {
"type": "string"
}
},
"type": "object"
},
"score": {
"type": "number"
},
"status": {
"type": "number"
},
"url": {
"type": "string"
},
"x402Version": {
"type": "number"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}