Find out what an x402 endpoint will charge before you pay it
Find out what an x402 endpoint will charge before you pay it. Probes the endpoint, reads the challenge from the header or the body, and returns the decoded price, network, asset and payTo plus the declared input and output schemas. Never sends a payment. Only reviewed origins are reachable, and a redirect is refused rather than followed.
Not tested: has real-world effectsour last check, 2026-10-02
0 of 0checks answered this week
n/amedian answer time
$0.004listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://api.zfinia.com/x402/v1/x402-endpoint-preflight
| Category | Market data |
|---|---|
| Provider host | api.zfinia.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 1 from 1 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"body": {
"domain": "stripe.com"
},
"method": "POST",
"url": "https://api.zfinia.com/x402/v1/company-evidence-pack"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"body": {
"description": "Optional JSON body to send with a POST probe.",
"type": "object"
},
"method": {
"description": "Method to probe with. Defaults to GET.",
"enum": [
"GET",
"POST"
],
"type": "string"
},
"url": {
"description": "HTTPS URL of an x402 endpoint on a reviewed origin. Credentials, ports and fragments are refused.",
"maxLength": 2048,
"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": {
"challenge": {
"description": "The decoded payment challenge, or null when the endpoint served none.",
"type": [
"object",
"null"
]
},
"challenge_header_present": {
"type": "boolean"
},
"challenge_source": {
"description": "header or body, depending on where the endpoint put the challenge.",
"type": [
"string",
"null"
]
},
"method": {
"type": "string"
},
"observed_at": {
"type": "string"
},
"payment_sent": {
"const": false,
"description": "Always false. This service never pays the endpoint it probes."
},
"reachable": {
"type": "boolean"
},
"request_id": {
"description": "Delivery request identifier; also returned in x-foundry-request-id.",
"type": "string"
},
"service_id": {
"description": "Canonical service identifier.",
"type": "string"
},
"service_version": {
"description": "Version of the invoked service.",
"type": "string"
},
"status": {
"type": "integer"
},
"url": {
"type": "string"
}
},
"required": [
"request_id",
"service_id",
"service_version",
"url",
"method",
"observed_at",
"status",
"reachable",
"payment_sent",
"challenge",
"challenge_source",
"challenge_header_present"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}