HALOWERK x402werk
HALOWERK provides paid endpoints that AI agents call and pay for per request via x402 on Base. No account, no API key, no signup.
DataLiveeip155:8453Exactvia 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.
$0.0030
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 18:26Z
—
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": "verify_offer_receipt",
"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": "3000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"pricing": "https://x402.halowerk.com/pricing",
"summary": "Verifies the signature of a signed x402 offer and of an optional receipt, recovers the signer, and says whether that signer is actually the address the offer wants to be paid to.",
"resource": {
"url": "https://x402.halowerk.com/receipt/verify",
"iconUrl": "https://x402.halowerk.com/favicon.svg",
"mimeType": "application/json",
"description": "Cryptographic verification of the offer-receipt extension of x402. Accepts a signed offer in eip712, jws or eip191 form — either bundled as {format, payload, signature} or as payload plus a separate signature — and an optional signed receipt. Recovers the signer, compares it with the payTo of the offer, compares receipt and offer field by field and names every divergence with the value on each side, checks whether the offer has expired and whether the receipt timestamps are plausible against sta",
"serviceName": "HALOWERK x402werk"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"offer": {
"format": "eip191",
"payload": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x617DF6d675425ab4bc3A71e67d1915E026EDCC9f",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"version": 1,
"validUntil": 4102444800,
"resourceUrl": "https://fetch.halowerk.com/extract"
},
"signature": "0x6b2703e77345fc7dae18f74b8851c9c995ffe74005eab9b9a52f9e86743fac6b033d42ba6005714d00bc40a5624405ba478832ab52bc7159217fec09a383f5bc1b"
}
},
"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",
"required": [
"offer"
],
"properties": {
"offer": {
"type": "object",
"description": "The signed offer as {format, payload, signature}, or the bare offer payload with version, resourceUrl, scheme, network, asset, payTo, amount and validUntil — then pass signature and format separately."
},
"format": {
"enum": [
"eip712",
"jws",
"eip191"
],
"type": "string",
"description": "Signature method, if the offer object does not name it. eip712 is what the offer-receipt extension produces."
},
"receipt": {
"type": "object",
"description": "Optional signed receipt as {format, payload, signature}, or the bare receipt payload with version, network, resourceUrl, payer, issuedAt and transaction."
},
"signature": {
"type": "string",
"maxLength": 8192,
"description": "Signature of the offer, if it is not inside the offer object."
},
"public_key": {
"type": "object",
"description": "Public key as a JWK, required for jws signatures whose key identifier cannot be resolved from the token itself."
},
"expected_payer": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Address you expected to have paid. When given, the receipt payer is compared against it."
},
"receipt_format": {
"enum": [
"eip712",
"jws",
"eip191"
],
"type": "string",
"description": "Signature method of the receipt, if the receipt object does not name it."
},
"receipt_signature": {
"type": "string",
"maxLength": 8192,
"description": "Signature of the receipt, if it is not inside the receipt object."
},
"max_receipt_age_seconds": {
"type": "integer",
"default": 3600,
"maximum": 2592000,
"minimum": 1,
"description": "How old a receipt may be before its timestamps are called implausible."
}
},
"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": "0.003",
"description": "Cryptographic verification of the offer-receipt extension of x402. Accepts a signed offer in eip712, jws or eip191 form — either bundled as {format, payload, signature} or as payload plus a separate signature — and an optional signed receipt. Recovers the signer, compares it with the payTo of the offer, compares receipt and offer field by field and names every divergence with the value on each side, checks whether the offer has expired and whether the receipt timestamps are plausible against stated tolerances. The answer states plainly that recovering a signer proves nothing on its own: every well-formed ECDSA signature yields some address, so signer_matches_pay_to is the deciding field, and a valid signature from the wrong address is worthless. For jws the signer is a key identifier and not an EVM address, so signer_matches_pay_to is reported as null rather than guessed. If the verification method cannot be determined or a jws public key is missing, the call ends unverifiable with charged=false and nothing is billed. Nothing is fetched, nothing is paid, no chain is read — whether a settlement actually happened on chain is Nr. 86.",
"inputSchema": {
"type": "object",
"required": [
"offer"
],
"properties": {
"offer": {
"type": "object",
"description": "The signed offer as {format, payload, signature}, or the bare offer payload with version, resourceUrl, scheme, network, asset, payTo, amount and validUntil — then pass signature and format separately."
},
"format": {
"enum": [
"eip712",
"jws",
"eip191"
],
"type": "string",
"description": "Signature method, if the offer object does not name it. eip712 is what the offer-receipt extension produces."
},
"receipt": {
"type": "object",
"description": "Optional signed receipt as {format, payload, signature}, or the bare receipt payload with version, network, resourceUrl, payer, issuedAt and transaction."
},
"signature": {
"type": "string",
"maxLength": 8192,
"description": "Signature of the offer, if it is not inside the offer object."
},
"public_key": {
"type": "object",
"description": "Public key as a JWK, required for jws signatures whose key identifier cannot be resolved from the token itself."
},
"expected_payer": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Address you expected to have paid. When given, the receipt payer is compared against it."
},
"receipt_format": {
"enum": [
"eip712",
"jws",
"eip191"
],
"type": "string",
"description": "Signature method of the receipt, if the receipt object does not name it."
},
"receipt_signature": {
"type": "string",
"maxLength": 8192,
"description": "Signature of the receipt, if it is not inside the receipt object."
},
"max_receipt_age_seconds": {
"type": "integer",
"default": 3600,
"maximum": 2592000,
"minimum": 1,
"description": "How old a receipt may be before its timestamps are called implausible."
}
},
"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": {
"signer": {
"type": [
"string",
"null"
]
},
"expired": {
"type": [
"boolean",
"null"
]
},
"verdict": {
"enum": [
"gueltig",
"abweichung",
"ungueltig",
"nicht_pruefbar"
],
"type": "string"
},
"mismatches": {
"type": "array",
"items": {
"type": "object",
"properties": {
"feld": {
"type": "string"
},
"im_beleg": {
"type": [
"string",
"null"
]
},
"im_angebot": {
"type": [
"string",
"null"
]
}
}
}
},
"fields_compared": {
"type": "array",
"items": {
"type": "string"
}
},
"thresholds_used": {
"type": "object"
},
"verdict_reasons": {
"type": "array",
"items": {
"type": "string"
}
},
"unavailable_fields": {
"type": "array",
"items": {
"type": "string"
}
},
"timestamps_plausible": {
"type": [
"boolean",
"null"
]
},
"offer_signature_valid": {
"type": [
"boolean",
"null"
]
},
"receipt_matches_offer": {
"type": [
"boolean",
"null"
]
},
"signer_matches_pay_to": {
"type": [
"boolean",
"null"
]
},
"receipt_signature_valid": {
"type": [
"boolean",
"null"
]
}
}
},
"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.
0.003USDC≈ $0.003 USD
on Base · exact scheme
Pay 0.003 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 3000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"offer": {}
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"required": [
"offer"
],
"properties": {
"offer": {
"type": "object",
"description": "The signed offer as {format, payload, signature}, or the bare offer payload with version, resourceUrl, scheme, network, asset, payTo, amount and validUntil — then pass signature and format separately."
},
"format": {
"enum": [
"eip712",
"jws",
"eip191"
],
"type": "string",
"description": "Signature method, if the offer object does not name it. eip712 is what the offer-receipt extension produces."
},
"receipt": {
"type": "object",
"description": "Optional signed receipt as {format, payload, signature}, or the bare receipt payload with version, network, resourceUrl, payer, issuedAt and transaction."
},
"signature": {
"type": "string",
"maxLength": 8192,
"description": "Signature of the offer, if it is not inside the offer object."
},
"public_key": {
"type": "object",
"description": "Public key as a JWK, required for jws signatures whose key identifier cannot be resolved from the token itself."
},
"expected_payer": {
"type": "string",
"pattern": "^0x[0-9a-fA-F]{40}$",
"description": "Address you expected to have paid. When given, the receipt payer is compared against it."
},
"receipt_format": {
"enum": [
"eip712",
"jws",
"eip191"
],
"type": "string",
"description": "Signature method of the receipt, if the receipt object does not name it."
},
"receipt_signature": {
"type": "string",
"maxLength": 8192,
"description": "Signature of the receipt, if it is not inside the receipt object."
},
"max_receipt_age_seconds": {
"type": "integer",
"default": 3600,
"maximum": 2592000,
"minimum": 1,
"description": "How old a receipt may be before its timestamps are called implausible."
}
},
"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 18:26Z
- Last indexed by Roundhouse
- 2026-09-08 18:00Z
- Last enriched (probe, favicon, geo)
- 2026-09-20 18:45Z
- 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/receipt/verify, 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.