Use when you need an x402 endpoint test or validation of a paid API before integ
Use when you need an x402 endpoint test or validation of a paid API before integrating or listing it. Do not use for actually paying the endpoint, or endpoints behind authentication. Returns JSON checking an x402 endpoint without paying: whether it answers 402, the parsed payment options (scheme, network, asset, amount, payTo), Bazaar discovery metadata and problems found for 0.007 USDC per call. Typical response time 2500 ms (p95). Category: Infrastructure.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
1421 msmedian answer time
$0.007listed price per call
$0.007price 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://x402-gateway.blackwoodstate8.workers.dev/v1/x402-check
| Category | Everything else |
|---|---|
| Provider host | x402-gateway.blackwoodstate8.workers.dev |
| Networks | eip155:8453 |
| Payment schemes | exact, upto |
| Self-reported calls, 30 days | 4 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.007 | 1421 ms |
Example input (from the provider)
{
"body": {
"url": "https://x402.org/protected"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"body": {
"additionalProperties": {},
"description": "JSON body to send with POST, e.g. {\"url\": \"https://example.com\"} (no payment is ever attached)",
"propertyNames": {
"type": "string"
},
"type": "object"
},
"method": {
"description": "HTTP method of the endpoint (GET when omitted)",
"enum": [
"GET",
"POST"
],
"type": "string"
},
"url": {
"description": "Public http(s) URL of the x402 endpoint, e.g. https://x402.org/protected",
"maxLength": 2048,
"minLength": 8,
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"additionalProperties": false,
"properties": {
"accepts": {
"items": {
"additionalProperties": false,
"properties": {
"amount": {
"type": [
"string",
"null"
]
},
"amountUsd": {
"type": [
"number",
"null"
]
},
"asset": {
"type": [
"string",
"null"
]
},
"maxTimeoutSeconds": {
"type": [
"number",
"null"
]
},
"network": {
"type": [
"string",
"null"
]
},
"payTo": {
"type": [
"string",
"null"
]
},
"scheme": {
"type": [
"string",
"null"
]
}
},
"required": [
"scheme",
"network",
"asset",
"amount",
"amountUsd",
"payTo",
"maxTimeoutSeconds"
],
"type": "object"
},
"type": "array"
},
"bazaar": {
"additionalProperties": false,
"properties": {
"inputSchema": {
"type": "boolean"
},
"outputSchema": {
"type": "boolean"
},
"present": {
"type": "boolean"
}
},
"required": [
"present",
"inputSchema",
"outputSchema"
],
"type": "object"
},
"checkedAt": {
"type": "string"
},
"finalUrl": {
"type": "string"
},
"next": {
"additionalProperties": false,
"description": "Suggested next paid call in the same family (call it in a loop when the task continues)",
"properties": {
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
},
"sample": {
"description": "Free fixed sample of the whole family",
"type": "string"
},
"service": {
"description": "Service id of the suggested next paid call",
"type": "string"
},
"tool": {
"description": "MCP tool name of the same call",
"type": "string"
},
"url": {
"description": "Paid route of the next call",
"type": "string"
},
"useWhen": {
"description": "When the next call is the right one",
"type": "string"
}
},
"required": [
"service",
"tool",
"method",
"url",
"useWhen",
"sample"
],
"type": "object"
},
"problems": {
"items": {
"type": "string"
},
"type": "array"
},
"resource": {
"anyOf": [
{
"additionalProperties": false,
"properties": {
"description": {
"type": [
"string",
"null"
]
},
"mime