Compare two snapshots of captured challenges and report every price movement per
Compare two snapshots of captured challenges and report every price movement per resource. Amounts are compared as exact integers, so a large atomic amount is never collapsed by floating point. Reports a resource that was priced before and is absent after, a rise beyond a tolerance you set, and a new resource that appeared. Nothing is paid.
Answers HTTP 429 without x402 payment termsour last check, 2026-10-04
0 of 1checks answered this week
n/amedian answer time
$0.13listed 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-price-drift-report
| 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 | no x402 terms | 429 | 251 ms |
Example input (from the provider)
{
"body": {
"after": [
{
"challenge": {
"accepts": [
{
"amount": "5000",
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"network": "eip155:8453",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact"
}
],
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
}
}
},
"resource": {
"description": "Paid resource at https://api.merchant.test/v1/score",
"mimeType": "application/json",
"url": "https://api.merchant.test/v1/score"
},
"x402Version": 2
},
"url": "https://api.merchant.test/v1/score"
},
{
"challenge": {
"accepts": [
{
"amount": "30000",
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"network": "eip155:8453",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact"
}
],
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
}
}
},
"resource": {
"description": "Paid resource at https://api.merchant.test/v1/enrich",
"mimeType": "application/json",
"url": "https://api.merchant.test/v1/enrich"
},
"x402Version": 2
},
"url": "https://api.merchant.test/v1/enrich"
},
{
"challenge": {
"accepts": [
{
"amount": "8000",
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"network": "eip155:8453",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact"
}
],
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
}
}
},
"resource": {
"description": "Paid resource at https://api.merchant.test/v1/classify",
"mimeType": "application/json",
"url": "https://api.merchant.test/v1/classify"
},
"x402Version": 2
},
"url": "https://api.merchant.test/v1/classify"
}
],
"before": [
{
"challenge": {
"accepts": [
{
"amount": "5000",
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"network": "eip155:8453",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact"
}
],
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
}
}
},
"resource": {
"description": "Paid resource at https://api.merchant.test/v1/score",
"mimeType": "application/json",
"url": "https://api.merchant.test/v1/score"
},
"x402Version": 2
},
"url": "https://api.merchant.test/v1/score"
},
{
"challenge": {
"accepts": [
{
"amount": "12000",
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"network": "eip155:8453",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact"
}
],
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
}
}
},
"resource": {
"description": "Paid resource at https://api.merchant.test/v1/enrich",
"mimeType": "application/json",
"url": "https://api.merchant.test/v1/enrich"
},
"x402Version": 2
},
"url": "https://api.merchant.test/v1/enrich"
},
{
"challenge": {
"accepts": [
{
"amount": "2000",
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"network": "eip155:8453",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact"
}
],
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"type": "object"
},
"output": {
"type": "object"
}
}
}
}
},
"resource": {
"description": "Paid resource at https://api.merchant.test/v1/legacy",
"mimeType": "application/json",
"url": "https://api.merchant.test/v1/legacy"
},
"x402Version": 2
},
"url": "https://api.merchant.test/v1/legacy"
}
],
"max_increase_fraction": 0.25
},
"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": {
"after": {
"items": {},
"maxItems": 200,
"minItems": 1,
"type": "array"
},
"before": {
"items": {},
"maxItems": 200,
"minItems": 1,
"type": "array"
},
"max_increase_fraction": {
"minimum": 0,
"type": "number"
}
},
"required": [
"before",
"after"
],
"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"
}