x402 Requirement Audit
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.
Tradingofflineeip155:8453Exactvia cdp
x402Machine paymentsConformancePreflightAgent commerce
Settlements · 30d
218↓ 56%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$25.30
Verified settled volume
255 settlements proven x402 by their on-chain EIP-3009 marker.
$0.100
Listed price
As published in the catalog. Always read the live 402 before paying.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-10-04 08:05Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x25e8245f07d5e4873987293dad666afbe56a9608The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.1USDC≈ $0.1 USD
on Base · exact scheme
Pay 0.1 USDC on Base to 0x25e8…a9608. The signed payment is good for 1 minute.
- Paid to
- 0x25e8…a9608
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 100000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "100000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"challenge": {
"accepts": [
{
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453"
},
{
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"payTo": "0xa1b2c30000000000000000000000000000009f8e",
"amount": "25000",
"scheme": "exact",
"network": "eip155:8453"
}
],
"resource": {
"url": "https://api.merchant.test/v1/other",
"mimeType": "application/json",
"description": "Scoring"
},
"extensions": {
"bazaar": {
"schema": {
"properties": {
"input": {
"type": "object"
}
}
}
}
},
"x402Version": 2
},
"expected_url": "https://api.merchant.test/v1/score"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"limits": {
"maxAssets": 100,
"maxAccepts": 20,
"maxFindings": 500,
"maxNetworks": 50,
"maxResources": 500,
"maxChallenges": 200
},
"passed": false,
"accepts": [
{
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"amount": "5000",
"pay_to": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact",
"network": "eip155:8453"
},
{
"asset": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"amount": "25000",
"pay_to": "0xa1b2c30000000000000000000000000000009f8e",
"scheme": "exact",
"network": "eip155:8453"
}
],
"version": 2,
"complete": true,
"findings": [
{
"code": "OUTPUT_SCHEMA_MISSING",
"detail": "OUTPUT_SCHEMA_MISSING does not stop a payment but makes the call harder to construct correctly.",
"severity": "advisory"
},
{
"code": "RESOURCE_NOT_BOUND_TO_ENDPOINT",
"detail": "The challenge names https://api.merchant.test/v1/other and it was served from https://api.merchant.test/v1/score, so paying it would satisfy a requirement for a different resource.",
"severity": "blocking"
},
{
"code": "OUTPUT_SCHEMA_MISSING",
"detail": "No output schema is declared, so a caller cannot type the result.",
"severity": "advisory"
}
],
"request_id": "example-request",
"service_id": "x402_payment_requirement_conformance",
"assumptions": [
"Nothing is fetched and nothing is paid. payment_sent is false on every response and is a constant, not a measurement.",
"A blocking defect stops a payment being constructed at all; an advisory one makes the call harder to get right. Only the first kind means do not attempt this.",
"payable_now is a statement about the challenge, never a promise that a payment would succeed."
],
"limitations": [
"Conformance of the challenge supplied. Whether the endpoint honours it, whether the price is fair, and whether the payee is who they claim are all outside what a challenge can show.",
"Without expected_url the resource binding is not checked, and payable_now is false in that case because an unchecked binding cannot read as safe."
],
"observed_at": "2026-10-02T00:00:00.000Z",
"payable_now": false,
"not_examined": [],
"payment_sent": false,
"resource_url": "https://api.merchant.test/v1/other",
"finding_count": 4,
"declared_input": {
"type": "object"
},
"declared_output": null,
"service_version": "1.0.0",
"findings_by_code": {
"ACCEPTS_PRICE_SPREAD": 1,
"OUTPUT_SCHEMA_MISSING": 2,
"RESOURCE_NOT_BOUND_TO_ENDPOINT": 1
},
"advisory_warnings": [
"OUTPUT_SCHEMA_MISSING"
],
"blocking_warnings": [],
"resource_is_object": true
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"challenge"
],
"properties": {
"challenge": {},
"expected_url": {
"type": "string",
"maxLength": 2048
},
"require_schemas": {
"type": "boolean"
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-04 08:05Z
- Last indexed by Roundhouse
- 2026-10-05 00:20Z
- Last enriched (probe, favicon, geo)
- 2026-10-04 11:15Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 0
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service x402 Requirement Audit and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=x402%20Requirement%20Audit' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://api.zfinia.com/x402/v1/x402-payment-requirement-conformance, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.