Counterexample
Find concrete JSON payloads accepted by a before schema and rejected by an after schema. Bounded search with verified witnesses; not a proof of compatibility.
The wallet the 402 directs payment to. Its full payment record is on the merchant page.
Asset 0x036CbD53842c5426634e7929541eC2318f3dCF7e
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.
Recent payments · which agents last used it
Every indexed settlement paid to this service’s wallet, newest first. The index does not record which endpoint a payment was for, so if this wallet serves more than one endpoint, the rows include payments for the others. Paged up to the newest 5,000; the full history is on the merchant page.
| Payer Payee | Chain | Amount | x402 | Route | Age | Txn hash |
|---|---|---|---|---|---|---|
| No settlements to this wallet are indexed yet. That is not a statement that the service has never been used. | ||||||
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 0.02 USDC on Base Sepolia to 0x73e5…385cc. The signed payment is good for 2 minutes.
- Paid to
- 0x73e5…385cc
- USD Coin (Base Sepolia) contract
- 0x036C…dCF7e
- Payment window
- 2 minutes
- As published
- 20000 smallest units
The catalog’s raw entry
[
{
"asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
"extra": {
"name": "USDC",
"version": "2",
"paymentFlow": "authorization",
"assetTransferMethod": "eip3009"
},
"payTo": "0x73e565f3b6ea6416bd9e62b98aa42c2f7a1385cc",
"amount": "20000",
"scheme": "exact",
"network": "eip155:84532",
"maxTimeoutSeconds": 120
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"after": {
"type": "object",
"required": [
"quantity"
],
"properties": {
"quantity": {
"type": "integer",
"minimum": 1
}
},
"additionalProperties": false
},
"before": {
"type": "object",
"required": [
"quantity"
],
"properties": {
"quantity": {
"type": "integer",
"minimum": 0
}
},
"additionalProperties": false
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"verdict": "breaking_examples_found",
"witnesses": [
{
"payload": {
"quantity": 0
},
"after_valid": false,
"before_valid": true
}
],
"compatibility_proven": false
}
}
},
"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": [
"before",
"after"
],
"properties": {
"after": {
"type": [
"object",
"boolean"
]
},
"before": {
"type": [
"object",
"boolean"
]
},
"samples": {
"type": "array",
"maxItems": 32
}
},
"additionalProperties": false
},
"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"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-10-07 19:41Z
- Last indexed by Roundhouse
- 2026-10-31 10:45Z
- Last enriched (probe, favicon, geo)
- –
- x402 version
- 2
- Max timeout
- 120s
- Liveness probe
- Not probed
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
Nothing indexed for this service or its provider yet. Not a claim that it is unused — only that we hold no record. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service Counterexample 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=Counterexample' 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://relay-agent-inference.j0wn0.chatgpt.site/v1/counterexamples, 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://preview.roundhouseai.io/dashboard/connections. If you have neither, ask before going further. If you do not have Roundhouse tools or skills installed, read https://preview.roundhouseai.io/skill.md first — it is the whole procedure.