x402 Challenge Decoder
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OtherLiveeip155:8453Exactvia cdp
x402Payment challengeAgent commerceMachine paymentsValidation
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 5 snapshots so far.
$25.35
Verified settled volume
256 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0020
Listed price
As published in the catalog. Always read the live 402 before paying.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
2
Unique payers · 30d
Last called 2026-10-05 08:51Z
—
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.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
],
"resource": {
"url": "https://api.zfinia.com/x402/v1/x402-challenge-decode",
"tags": [
"x402",
"payment challenge",
"agent commerce",
"machine payments",
"validation"
],
"mimeType": "application/json",
"description": "Decode an x402 payment challenge before paying: give it the raw 402 body or payment-required header, as JSON or base64, and get back the version, resource, and every accepted payment normalised to scheme, network, asset, amount and payTo. Names what is wrong with named warnings — bad amount, unrecognised network, invalid payTo, unsupported scheme, missing input or output schema — and returns the declared Bazaar schemas. No network call, no payment sent.",
"serviceName": "x402 Challenge Decoder"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"payload": {
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453"
}
],
"x402Version": 2
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "2000",
"pay_to": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"scheme": "exact",
"network": "eip155:8453"
}
],
"version": 2,
"resource": null,
"warnings": [
"INPUT_SCHEMA_MISSING",
"OUTPUT_SCHEMA_MISSING"
],
"request_id": "example-request",
"service_id": "x402_challenge_decode",
"payment_sent": false,
"declared_input": null,
"declared_output": null,
"service_version": "1.0.0"
}
}
},
"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": [
"payload"
],
"properties": {
"payload": {
"oneOf": [
{
"type": "object"
},
{
"type": "string",
"maxLength": 16384,
"minLength": 1
}
],
"description": "An x402 payment-required payload: the parsed JSON object, the raw JSON string, or the base64 value of a payment-required header."
}
},
"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",
"required": [
"request_id",
"service_id",
"service_version",
"version",
"resource",
"accepts",
"warnings",
"declared_input",
"declared_output",
"payment_sent"
],
"properties": {
"accepts": {
"type": "array",
"items": {
"type": "object",
"required": [
"scheme",
"network",
"asset",
"amount",
"pay_to"
],
"properties": {
"asset": {
"type": [
"string",
"null"
],
"description": "Asset contract address as declared."
},
"amount": {
"type": [
"string",
"null"
],
"description": "Price in atomic units of the asset, as declared."
},
"pay_to": {
"type": [
"string",
"null"
],
"description": "Recipient address as declared."
},
"scheme": {
"type": [
"string",
"null"
],
"description": "Payment scheme as declared, e.g. \"exact\"."
},
"network": {
"type": [
"string",
"null"
],
"description": "CAIP-2 network identifier as declared, e.g. \"eip155:8453\"."
}
},
"additionalProperties": false
},
"description": "Accepted payments, normalised. At most 20 are returned."
},
"version": {
"type": [
"integer",
"null"
],
"description": "Declared x402Version, or null when absent or not a number."
},
"resource": {
"description": "Declared resource, verbatim, or null."
},
"warnings": {
"type": "array",
"items": {
"type": "string"
},
"description": "Deduplicated warning codes describing what is wrong with the challenge."
},
"request_id": {
"type": "string",
"description": "Delivery request identifier; also returned in x-foundry-request-id."
},
"service_id": {
"type": "string",
"description": "Canonical service identifier."
},
"payment_sent": {
"const": false,
"description": "Always false. This service never pays anything."
},
"declared_input": {
"description": "Input schema declared under extensions.bazaar.schema.properties.input, or null."
},
"declared_output": {
"description": "Output schema declared under extensions.bazaar.schema.properties.output, or null."
},
"service_version": {
"type": "string",
"description": "Version of the invoked service."
}
},
"additionalProperties": false
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.002USDC≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0x25e8…a9608. The signed payment is good for 1 minute.
- Paid to
- 0x25e8…a9608
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"payload": {
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453"
}
],
"x402Version": 2
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "2000",
"pay_to": "0x25e8245f07d5e4873987293dad666afbe56a9608",
"scheme": "exact",
"network": "eip155:8453"
}
],
"version": 2,
"resource": null,
"warnings": [
"INPUT_SCHEMA_MISSING",
"OUTPUT_SCHEMA_MISSING"
],
"request_id": "example-request",
"service_id": "x402_challenge_decode",
"payment_sent": false,
"declared_input": null,
"declared_output": null,
"service_version": "1.0.0"
}
}
},
"schema": {
"type": "object",
"$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": [
"payload"
],
"properties": {
"payload": {
"oneOf": [
{
"type": "object"
},
{
"type": "string",
"maxLength": 16384,
"minLength": 1
}
]
}
},
"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
- 2026-10-05 08:51Z
- Last indexed by Roundhouse
- 2026-10-06 00:50Z
- Last enriched (probe, favicon, geo)
- 2026-10-02 10:15Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 402
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
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 5 snapshots so far. 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 Challenge Decoder 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%20Challenge%20Decoder' 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-challenge-decode, 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.