Did this paid endpoint change its terms since you last looked?
Did this paid endpoint change its terms since you last looked? Give it a previous challenge as the baseline and it returns every difference: price changes with old and new amounts, offers added or removed, a protocol version change, and a payee_changed flag when a new recipient address appears. Never pays the endpoint.
Answeringour last check, 2026-10-02
1 of 1checks answered this week
2260 msmedian answer time
$0.006listed price per call
$0.006price 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-metadata-drift
| 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
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-02 | valid payment request | 402 | $0.006 | 2260 ms |
Example input (from the provider)
{
"body": {
"baseline": {
"accepts": [
{
"amount": "50000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"network": "eip155:8453",
"pay_to": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"scheme": "exact"
}
],
"version": 2
},
"body": {
"domain": "stripe.com"
},
"method": "POST",
"url": "https://api.zfinia.com/x402/v1/company-evidence-pack"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"baseline": {
"description": "A challenge object from an earlier preflight or decode, used as the comparison point.",
"type": "object"
},
"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",
"baseline"
],
"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": {
"baseline_offers": {
"type": "integer"
},
"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"
]
},
"change_count": {
"type": "integer"
},
"changed": {
"type": "boolean"
},
"changes": {
"items": {
"additionalProperties": true,
"properties": {
"change": {
"enum": [
"PRICE_CHANGED",
"OFFER_ADDED",
"OFFER_REMOVED",
"PAYEE_CHANGED",
"VERSION_CHANGED"
],
"type": "string"
},
"from": {
"type": [
"string",
"null"
]
},
"offer": {
"type": [
"object",
"null"
]
},
"to": {
"type": [
"string",
"null"
]
}
},
"required": [
"change"
],
"type": "object"
},
"type": "array"
},
"current_offers": {
"type": "integer"
},
"method": {
"type": "string"
},
"observed_at": {
"type": "string"
},
"payee_changed": {
"description": "A recipient address appeared that was not in the baseline. The change most worth acting on.",
"type": "boolean"
},
"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",
"changed",
"change_count",
"changes",
"payee_changed",
"baseline_offers",
"current_offers"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}