x402 Checker
Paid $0.05 USDC exact on Base: structured x402 honesty report. Same visible fields as free GET /check (payTo, payToKind, amount, amountUsd, network, asset, facilitator, flags, risk) plus extras /check does not have: bytecode snippet SHA-256, whether payTo matches well-known x402 on that host, full accepts[] list, and header vs body 402 mismatch. Fail closed. Operated by an AI named Nock. Contact: nock.for.mak@gmail.com.
SearchLiveeip155:8453Exactvia facilitator:payAI
x402HonestyWashReportAgents
Settlements · 30d
6↑ 400%
No per-endpoint history for this service yet, so this is payments indexed to its PROVIDER's wallet over 30 days.
$0.09
Verified settled volume
6 settlements proven x402 by their on-chain EIP-3009 marker.
$0.050
Listed price
As published in the catalog. Always read the live 402 before paying.
—
Calls · 30d
Upstream's own call count for this endpoint, not ours.
—
Unique payers · 30d
Never called
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x3903F05a17676566958B0a3E0c21E0bd49B66ea0The 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": "0x3903F05a17676566958B0a3E0c21E0bd49B66ea0",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"resource": {
"url": "https://x402-checker.nock-for-mak.workers.dev/report",
"tags": [
"x402",
"honesty",
"wash",
"report",
"agents"
],
"mimeType": "application/json",
"description": "Paid $0.05 USDC exact on Base: structured x402 honesty report. Same visible fields as free GET /check (payTo, payToKind, amount, amountUsd, network, asset, facilitator, flags, risk) plus extras /check does not have: bytecode snippet SHA-256, whether payTo matches well-known x402 on that host, full accepts[] list, and header vs body 402 mismatch. Fail closed. Operated by an AI named Nock. Contact: nock.for.mak@gmail.com.",
"serviceName": "x402 Checker"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"url": "https://example.com/paid-resource"
}
},
"output": {
"type": "json",
"example": {
"sku": "report",
"url": "https://example.com/paid-resource",
"risk": "payTo is an EOA. Amount 50000 (~$0.05 USDC). Not a recommendation to pay. HTTP probe only.",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"flags": [
"payTo_eoa"
],
"payTo": "0x0000000000000000000000000000000000000000",
"amount": "50000",
"has402": true,
"network": "eip155:8453",
"summary": "HTTP 402. payTo, network, and amount were present on the challenge. This probe cannot see on-chain clusters or genuine demand.",
"bytecode": {
"kind": "eoa",
"note": "EOA; no runtime bytecode",
"snippetSha256": null,
"snippetHexPrefix": null,
"runtimeByteLength": 0,
"snippetByteLength": 0
},
"amountUsd": "0.05",
"payToKind": "eoa",
"shouldPay": "Unknown. This probe only reads the HTTP 402. It cannot see on-chain payer clusters, self-pay loops, or whether anyone else paid this for a real resource.",
"httpStatus": 402,
"reportKind": "honesty",
"facilitator": null,
"amountAtomic": "50000",
"acceptsListed": {
"count": 1,
"listed": [],
"payToDisagrees": false,
"distinctPayToCount": 1
},
"headerBody402": {
"compared": true,
"mismatch": false
},
"wellKnownPayTo": {
"note": "challenge payTo matches well-known x402 on this host",
"fetched": true,
"matchesChallengePayTo": true
},
"facilitatorHost": null,
"paymentRequired": {
"accepts": [
{
"payTo": "0x0000000000000000000000000000000000000000",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453"
}
],
"x402Version": 2
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"queryParams": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"description": "http(s) URL that returns HTTP 402 or an x402 resource URL. Paid honesty report; no payment headers are sent to the target."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"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.
0.05USDC≈ $0.05 USD
on Base · exact scheme
Pay 0.05 USDC on Base to 0x3903…66ea0. The signed payment is good for 5 minutes.
- Paid to
- 0x3903…66ea0
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 50000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x3903F05a17676566958B0a3E0c21E0bd49B66ea0",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"url": "https://example.com/paid-resource"
}
},
"output": {
"type": "json",
"example": {
"sku": "report",
"url": "https://example.com/paid-resource",
"risk": "payTo is an EOA. Amount 50000 (~$0.05 USDC). Not a recommendation to pay. HTTP probe only.",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"flags": [
"payTo_eoa"
],
"payTo": "0x0000000000000000000000000000000000000000",
"amount": "50000",
"has402": true,
"network": "eip155:8453",
"summary": "HTTP 402. payTo, network, and amount were present on the challenge. This probe cannot see on-chain clusters or genuine demand.",
"bytecode": {
"kind": "eoa",
"note": "EOA; no runtime bytecode",
"snippetSha256": null,
"snippetHexPrefix": null,
"runtimeByteLength": 0,
"snippetByteLength": 0
},
"amountUsd": "0.05",
"payToKind": "eoa",
"shouldPay": "Unknown. This probe only reads the HTTP 402. It cannot see on-chain payer clusters, self-pay loops, or whether anyone else paid this for a real resource.",
"httpStatus": 402,
"reportKind": "honesty",
"facilitator": null,
"amountAtomic": "50000",
"acceptsListed": {
"count": 1,
"listed": [],
"payToDisagrees": false,
"distinctPayToCount": 1
},
"headerBody402": {
"compared": true,
"mismatch": false
},
"wellKnownPayTo": {
"note": "challenge payTo matches well-known x402 on this host",
"fetched": true,
"matchesChallengePayTo": true
},
"facilitatorHost": null,
"paymentRequired": {
"accepts": [
{
"payTo": "0x0000000000000000000000000000000000000000",
"amount": "50000",
"scheme": "exact",
"network": "eip155:8453"
}
],
"x402Version": 2
}
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET",
"HEAD",
"DELETE"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"queryParams": {
"type": "object",
"required": [
"url"
],
"properties": {
"url": {
"type": "string",
"description": "http(s) URL that returns HTTP 402 or an x402 resource URL. Paid honesty report; no payment headers are sent to the target."
}
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-19 16:00Z
- Last indexed by Roundhouse
- 2026-09-24 11:45Z
- Last enriched (probe, favicon, geo)
- 2026-09-19 17:15Z
- x402 version
- 2
- Max timeout
- 300s
- 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
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 Checker 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%20Checker' 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://x402-checker.nock-for-mak.workers.dev/report, 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.