realx402-seller
Verify an x402 seller before paying it: does it exist and respond with a well-formed 402 challenge, is its own declared input/output schema internally consistent, and is its payout address sanctioned? Checked live against the seller itself plus Chainalysis's sanctions oracle and Blockscout (Base payTo addresses only). Confirms the checkable things about a seller check out -- not a guarantee of trustworthiness, which no free source can promise.
The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
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.
Pay 0.005 USDC on Base to 0xf3b3…58de1. The signed payment is good for 5 minutes.
- Paid to
- 0xf3b3…58de1
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 5000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xf3b36a95913eb2676fcdedb2ba6b0c96ade58de1",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"method": "POST",
"resource_url": "https://api.example.com/paid-endpoint"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"cost": {
"amount": "0.005",
"currency": "USDC"
},
"checks": {
"exists": true,
"payto_sanctioned": false,
"declaration_consistent": true
},
"verdict": "confirmed",
"evidence": [
{
"url": "https://api.example.com/paid-endpoint",
"source": "direct_fetch",
"retrieved_at": "2026-08-30T12:00:00Z"
},
{
"url": "https://mainnet.base.org",
"source": "chainalysis",
"retrieved_at": "2026-08-30T12:00:00Z"
},
{
"url": "https://api.blockscout.com/v2/api",
"source": "blockscout",
"retrieved_at": "2026-08-30T12:00:00Z"
},
{
"url": "https://cairnwake.com/r/df2f7a42.html",
"source": "cairn",
"retrieved_at": "2026-08-30T12:00:00Z"
}
],
"canonical": {
"tags": [
"example"
],
"payto": "0x0000000000000000000000000000000000dEaD",
"network": "eip155:8453",
"description": "An example x402 service.",
"resource_url": "https://api.example.com/paid-endpoint",
"service_name": "example-service",
"wallet_age_days": 412.3,
"wallet_tx_count": 87,
"cairn_conformance": {
"date": "2026-09-02",
"score": {
"total": 16,
"passed": 16,
"inconclusive": 0,
"observations": 2
},
"verdict": "PASS",
"report_url": "https://cairnwake.com/r/df2f7a42.html"
}
},
"latency_ms": 640
}
}
},
"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": {
"required": [
"resource_url"
],
"properties": {
"method": {
"enum": [
"GET",
"POST"
],
"type": "string",
"description": "HTTP method that triggers the seller's 402 challenge."
},
"resource_url": {
"type": "string",
"description": "The x402 resource URL to verify."
}
},
"description": "Provide the exact x402 resource URL; method defaults to POST."
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"properties": {
"cost": {
"type": "object"
},
"checks": {
"type": "object"
},
"verdict": {
"enum": [
"confirmed",
"contradicted",
"unknown"
],
"type": "string"
},
"evidence": {
"type": "array"
},
"canonical": {
"type": [
"object",
"null"
]
},
"latency_ms": {
"type": "integer"
}
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-04 01:27Z
- Last indexed by Roundhouse
- 2026-09-24 10:00Z
- Last enriched (probe, favicon, geo)
- 2026-09-24 03:16Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 404
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. 23 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 realx402-seller 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=realx402-seller' 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://goodsong.dev/verify/seller, 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. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.