HALOWERK x402werk
A stateful duplicate check for agents that settle x402 payments. Supply any of payment_id, payload_hash and nonce; each is hashed with SHA-256 before storage, so the service keeps fingerprints and timestamps and never the values themselves, never a payload, never an address. The answer states for every supplied identifier whether it was seen before, when it was first and last seen, how often, and whether the first sighting falls inside window_seconds. The recommendation is ablehnen only for a re
InfraLiveeip155:8453Exactvia cdp
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 16 snapshots so far.
$11.47
Verified settled volume
2,654 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.
1
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-09 10:30Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5EThe 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.
{
"docs": "https://x402.halowerk.com/llms.txt",
"name": "replay_guard",
"error": "payment_required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"pricing": "https://x402.halowerk.com/pricing",
"summary": "Remembers payment identifiers, payload hashes and nonces as one-way fingerprints and tells you whether this one has been seen before, when, how often, and whether that sighting lies inside your window.",
"resource": {
"url": "https://x402.halowerk.com/guard/replay",
"iconUrl": "https://x402.halowerk.com/favicon.svg",
"mimeType": "application/json",
"description": "A stateful duplicate check for agents that settle x402 payments. Supply any of payment_id, payload_hash and nonce; each is hashed with SHA-256 before storage, so the service keeps fingerprints and timestamps and never the values themselves, never a payload, never an address. The answer states for every supplied identifier whether it was seen before, when it was first and last seen, how often, and whether the first sighting falls inside window_seconds. The recommendation is ablehnen only for a re",
"serviceName": "HALOWERK x402werk"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"payment_id": "payment-20260809-001",
"payload_hash": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"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",
"anyOf": [
{
"required": [
"payment_id"
]
},
{
"required": [
"payload_hash"
]
},
{
"required": [
"nonce"
]
}
],
"properties": {
"nonce": {
"type": "string",
"maxLength": 512,
"minLength": 1,
"description": "Nonce of the signed payment authorisation. Stored only as a SHA-256 fingerprint."
},
"record": {
"type": "boolean",
"default": true,
"description": "Whether this call is remembered. Set to false to check without writing, so repeated checks of the same payment do not report themselves as duplicates."
},
"payment_id": {
"type": "string",
"maxLength": 512,
"minLength": 1,
"description": "Payment identifier of the x402 payment-identifier extension, or any identifier your client treats as unique per payment. Stored only as a SHA-256 fingerprint."
},
"payload_hash": {
"type": "string",
"maxLength": 512,
"minLength": 1,
"description": "Hash of the request payload that was paid for. Stored only as a SHA-256 fingerprint of the value you send."
},
"window_seconds": {
"type": "integer",
"default": 3600,
"maximum": 86400,
"minimum": 1,
"description": "How far back a sighting still counts as a duplicate for the recommendation. Fingerprints are kept for 24 hours regardless."
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
}
}
}
}
},
"price_usdc": "0.002",
"description": "A stateful duplicate check for agents that settle x402 payments. Supply any of payment_id, payload_hash and nonce; each is hashed with SHA-256 before storage, so the service keeps fingerprints and timestamps and never the values themselves, never a payload, never an address. The answer states for every supplied identifier whether it was seen before, when it was first and last seen, how often, and whether the first sighting falls inside window_seconds. The recommendation is ablehnen only for a repeated payment_id or nonce inside the window, since both are unique by definition; a repeated payload_hash alone yields pruefen, because buying the same query twice is legitimate. Every threshold behind the recommendation is stated in the answer. Fingerprints expire 24 hours after the last sighting. Set record to false to ask without writing, so a repeated check does not create the duplicate it reports. This endpoint does not verify payments, does not look at any chain and does not block anything by itself.",
"inputSchema": {
"type": "object",
"anyOf": [
{
"required": [
"payment_id"
]
},
{
"required": [
"payload_hash"
]
},
{
"required": [
"nonce"
]
}
],
"properties": {
"nonce": {
"type": "string",
"maxLength": 512,
"minLength": 1,
"description": "Nonce of the signed payment authorisation. Stored only as a SHA-256 fingerprint."
},
"record": {
"type": "boolean",
"default": true,
"description": "Whether this call is remembered. Set to false to check without writing, so repeated checks of the same payment do not report themselves as duplicates."
},
"payment_id": {
"type": "string",
"maxLength": 512,
"minLength": 1,
"description": "Payment identifier of the x402 payment-identifier extension, or any identifier your client treats as unique per payment. Stored only as a SHA-256 fingerprint."
},
"payload_hash": {
"type": "string",
"maxLength": 512,
"minLength": 1,
"description": "Hash of the request payload that was paid for. Stored only as a SHA-256 fingerprint of the value you send."
},
"window_seconds": {
"type": "integer",
"default": 3600,
"maximum": 86400,
"minimum": 1,
"description": "How far back a sighting still counts as a duplicate for the recommendation. Fingerprints are kept for 24 hours regardless."
}
},
"additionalProperties": false
},
"price_model": "per_call",
"x402Version": 2,
"instructions": "Sign the accepted terms with an x402 client and repeat the request with the payment header.",
"outputSchema": {
"type": "object",
"properties": {
"age_ms": {
"type": "integer"
},
"evidence": {
"type": "object"
},
"first_seen": {
"type": [
"string",
"null"
]
},
"seen_count": {
"type": "integer"
},
"ts_fetched": {
"type": "integer"
},
"duplicate_of": {
"type": [
"object",
"null"
]
},
"is_duplicate": {
"type": "boolean"
},
"nonce_reused": {
"type": [
"boolean",
"null"
]
},
"within_window": {
"type": "boolean"
},
"recommendation": {
"enum": [
"annehmen",
"ablehnen",
"pruefen"
],
"type": "string"
},
"thresholds_used": {
"type": "object"
},
"unavailable_fields": {
"type": "array",
"items": {
"type": "string"
}
}
}
},
"payment_header": "PAYMENT-SIGNATURE",
"capability_request": {
"url": "https://bedarf.halowerk.com/capabilities/request",
"cost": "free",
"method": "POST",
"description": "Missing a capability, or does the scope not fit? Report the need here - no payment required. Similar reports are bundled; the response returns an id you can check back on.",
"body_example": {
"max_price": 0.01,
"description": "what exactly is needed",
"requested_capability": "short label"
}
}
}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≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"payment_id": "beispiel",
"payload_hash": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"anyOf": [
{
"required": [
"payment_id"
]
},
{
"required": [
"payload_hash"
]
},
{
"required": [
"nonce"
]
}
],
"properties": {
"nonce": {
"type": "string",
"maxLength": 512,
"minLength": 1,
"description": "Nonce of the signed payment authorisation. Stored only as a SHA-256 fingerprint."
},
"record": {
"type": "boolean",
"default": true,
"description": "Whether this call is remembered. Set to false to check without writing, so repeated checks of the same payment do not report themselves as duplicates."
},
"payment_id": {
"type": "string",
"maxLength": 512,
"minLength": 1,
"description": "Payment identifier of the x402 payment-identifier extension, or any identifier your client treats as unique per payment. Stored only as a SHA-256 fingerprint."
},
"payload_hash": {
"type": "string",
"maxLength": 512,
"minLength": 1,
"description": "Hash of the request payload that was paid for. Stored only as a SHA-256 fingerprint of the value you send."
},
"window_seconds": {
"type": "integer",
"default": 3600,
"maximum": 86400,
"minimum": 1,
"description": "How far back a sighting still counts as a duplicate for the recommendation. Fingerprints are kept for 24 hours regardless."
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-08-09 10:30Z
- Last indexed by Roundhouse
- 2026-09-08 10:30Z
- Last enriched (probe, favicon, geo)
- 2026-09-20 19:15Z
- 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
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 16 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 HALOWERK x402werk 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=HALOWERK%20x402werk' 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.halowerk.com/guard/replay, 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.