Check an x402 endpoint before paying it
Check an x402 endpoint before paying it: go / caution / no_go, the recommended payment option, and why (payment would fail, over your budget, price above advertised, not HTTPS, unknown token). Never pays the endpoint. Cached 10 min.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
238 msmedian answer time
$0.001listed price per call
$0.001price 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://x402-doctor.onrender.com/api/v1/preflight
| Category | Market data |
|---|---|
| Provider host | x402-doctor.onrender.com |
| Networks | eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.001 | 238 ms |
Example input (from the provider)
{
"method": "GET",
"queryParams": {
"max_usd": "0.05",
"url": "https://ichimoku-signal.onrender.com/signal/BTC-USDT"
},
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"max_usd": {
"description": "Your budget per call in USD; above it the verdict is no_go.",
"type": "string"
},
"method": {
"description": "HTTP method you will call it with. Default: try GET, then POST.",
"enum": [
"GET",
"POST"
],
"type": "string"
},
"network": {
"description": "CAIP-2 network you want to pay on, e.g. eip155:8453 or solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp.",
"type": "string"
},
"url": {
"description": "The x402 endpoint you are about to pay.",
"type": "string"
}
},
"required": [
"url"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"cached": {
"type": "boolean"
},
"checked_at": {
"type": "string"
},
"method": {
"type": [
"string",
"null"
]
},
"options": {
"items": {
"properties": {
"amount": {
"type": [
"string",
"null"
]
},
"asset_symbol": {
"type": [
"string",
"null"
]
},
"index": {
"type": "integer"
},
"network": {
"type": [
"string",
"null"
]
},
"network_name": {
"type": [
"string",
"null"
]
},
"pay_to": {
"type": [
"string",
"null"
]
},
"payable": {
"type": "boolean"
},
"problems": {
"items": {
"type": "string"
},
"type": "array"
},
"usd": {
"type": [
"number",
"null"
]
}
},
"required": [
"index",
"payable",
"problems"
],
"type": "object"
},
"type": "array"
},
"reasons": {
"items": {
"properties": {
"code": {
"type": "string"
},
"level": {
"enum": [
"no_go",
"caution",
"info"
],
"type": "string"
},
"message": {
"type": "string"
}
},
"required": [
"level",
"code",
"message"
],
"type": "object"
},
"type": "array"
},
"recommended_option": {
"type": [
"integer",
"null"
]
},
"safe_to_pay": {
"type": "boolean"
},
"signals": {
"type": "object"
},
"summary": {
"type": "string"
},
"url": {
"type": "string"
},
"verdict": {
"enum": [
"go",
"caution",
"no_go"
],
"type": "string"
}
},
"required": [
"url",
"verdict",
"safe_to_pay",
"summary",
"options",
"reasons"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}