Decide whether a captured 402 challenge can actually be paid
Decide whether a captured 402 challenge can actually be paid. Separates defects that stop a payment being constructed from ones that merely make the call harder to get right, and checks the resource is bound to the endpoint that served it - a challenge naming a different resource would, if paid, satisfy a requirement for something else. Also names the price spread when several payments are accepted. Nothing is fetched and nothing is paid.
Answeringour last check, 2026-10-04
1 of 1checks answered this week
3134 msmedian answer time
$0.1listed price per call
$0.1price 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-payment-requirement-conformance
| 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 |
|---|---|---|---|---|
| 2026-10-04 | valid payment request | 402 | $0.1 | 3134 ms |
Example input (from the provider)
{
"body": {
"challenge": {
"accepts": [
{
"amount": "5000",
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"network": "eip155:8453",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact"
},
{
"amount": "25000",
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"network": "eip155:8453",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact"
}
],
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"type": "object"
}
}
}
}
},
"resource": {
"description": "Scoring",
"mimeType": "application/json",
"url": "https://api.merchant.test/v1/other"
},
"x402Version": 2
},
"expected_url": "https://api.merchant.test/v1/score"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"challenge": {},
"expected_url": {
"maxLength": 2048,
"type": "string"
},
"require_schemas": {
"type": "boolean"
}
},
"required": [
"challenge"
],
"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": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}