buero.halowerk.com
HALOWERK provides paid endpoints that AI agents call and pay for per request via x402 on Base. No account, no API key, no signup.
InferenceLiveeip155:8453Exactvia cdp
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 18 snapshots so far.
$11.47
Verified settled volume
2,654 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0040
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 2026-08-11 14:21Z
—
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://buero.halowerk.com/llms.txt",
"name": "terms_diff",
"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": "4000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"pricing": "https://buero.halowerk.com/pricing",
"resource": {
"url": "https://buero.halowerk.com/v1/terms-diff",
"mimeType": "application/json",
"description": "Takes two contract versions as text, public URLs or inline base64 — PDF, DOCX, ODT, HTML and Markdown are read — and reports what is different. Which passages changed is decided by a Myers shortest-edit-script over the paragraphs, not by a model: the deterministic comparison is the source of truth, and only afterwards is a model asked what changed in substance at those specific places. That order is the point."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"a": {
"text": "§ 2 Laufzeit\nDer Vertrag laeuft zwoelf Monate.\n\n§ 5 Haftung\nDie Haftung ist auf den Auftragswert begrenzt."
},
"b": {
"text": "§ 2 Laufzeit\nDer Vertrag laeuft vierundzwanzig Monate.\n\n§ 5 Haftung\nDie Haftung ist auf den Auftragswert begrenzt.\n\n§ 8 Gerichtsstand\nGerichtsstand ist Berlin."
}
},
"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": [
"a",
"b"
],
"properties": {
"a": {
"type": "object",
"properties": {
"url": {
"type": "string",
"maxLength": 2048,
"description": "Public http(s) URL of a PDF, DOCX, ODT, HTML or text file. Private and local addresses are refused."
},
"text": {
"type": "string",
"maxLength": 200000,
"description": "The text directly. Cheapest and clearest — its length is billed as counted here."
},
"format": {
"enum": [
"auto",
"pdf",
"docx",
"odt",
"html",
"markdown",
"rtf",
"text"
],
"type": "string",
"default": "auto",
"description": "Override the detected format. \"auto\" reads it from the bytes."
},
"filename": {
"type": "string",
"maxLength": 260,
"description": "Only consulted when the bytes carry no recognisable signature."
},
"content_base64": {
"type": "string",
"maxLength": 4000000,
"description": "The file inline, base64."
}
},
"description": "The earlier version. Exactly one of text, url or content_base64.",
"additionalProperties": false
},
"b": {
"type": "object",
"properties": {
"url": {
"type": "string",
"maxLength": 2048,
"description": "Public http(s) URL of a PDF, DOCX, ODT, HTML or text file. Private and local addresses are refused."
},
"text": {
"type": "string",
"maxLength": 200000,
"description": "The text directly. Cheapest and clearest — its length is billed as counted here."
},
"format": {
"enum": [
"auto",
"pdf",
"docx",
"odt",
"html",
"markdown",
"rtf",
"text"
],
"type": "string",
"default": "auto",
"description": "Override the detected format. \"auto\" reads it from the bytes."
},
"filename": {
"type": "string",
"maxLength": 260,
"description": "Only consulted when the bytes carry no recognisable signature."
},
"content_base64": {
"type": "string",
"maxLength": 4000000,
"description": "The file inline, base64."
}
},
"description": "The later version. Same shape as a.",
"additionalProperties": false
},
"document_chars": {
"type": "integer",
"maximum": 24000,
"minimum": 1,
"description": "Only needed when a version arrives by url or content_base64: the combined length of both versions in characters, which is what you are billed for. Longer text is refused with the real length and nothing is charged."
},
"ignore_whitespace": {
"type": "boolean",
"default": true,
"description": "Treat runs of spaces and tabs as one space before comparing."
},
"max_changes_described": {
"type": "integer",
"default": 25,
"maximum": 60,
"minimum": 1,
"description": "How many changed passages the model describes. Beyond this the passages still come back with their before and after text, only without a description — what is dropped is counted, never silently cut."
},
"include_unchanged_count": {
"type": "boolean",
"default": true,
"description": "Report how many paragraphs stayed identical."
}
},
"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": "0.004000",
"description": "Takes two contract versions as text, public URLs or inline base64 — PDF, DOCX, ODT, HTML and Markdown are read — and reports what is different. Which passages changed is decided by a Myers shortest-edit-script over the paragraphs, not by a model: the deterministic comparison is the source of truth, and only afterwards is a model asked what changed in substance at those specific places. That order is the point. A model handed two whole contracts returns a plausible list of changes whose completeness nobody can check, which on a contract is the most expensive mistake available; here every statement is anchored to a paragraph pair that both versions evidence, and any passage the model fails to describe is still returned with its before and after text, because the diff decides, not the model. Each change carries its old and new wording, a word-level diff of exactly which words went and came, a factual type — value changed, deadline changed, obligation added or removed, party, scope, reference, or wording only — and the concrete old and new values where there are any. Alongside comes a symmetric similarity figure and the counts of added, removed and reworded paragraphs. What this endpoint does not do is judge: it says what is different, never whether a change is favourable, material or enforceable, and it is not legal advice. The changed passages are processed by a third-party model — provider, what leaves this machine and what is retained there are named in every answer. Nothing is cached, nothing is written to a database, and no part of either contract appears in any log or error message.",
"inputSchema": {
"type": "object",
"required": [
"a",
"b"
],
"properties": {
"a": {
"type": "object",
"properties": {
"url": {
"type": "string",
"maxLength": 2048,
"description": "Public http(s) URL of a PDF, DOCX, ODT, HTML or text file. Private and local addresses are refused."
},
"text": {
"type": "string",
"maxLength": 200000,
"description": "The text directly. Cheapest and clearest — its length is billed as counted here."
},
"format": {
"enum": [
"auto",
"pdf",
"docx",
"odt",
"html",
"markdown",
"rtf",
"text"
],
"type": "string",
"default": "auto",
"description": "Override the detected format. \"auto\" reads it from the bytes."
},
"filename": {
"type": "string",
"maxLength": 260,
"description": "Only consulted when the bytes carry no recognisable signature."
},
"content_base64": {
"type": "string",
"maxLength": 4000000,
"description": "The file inline, base64."
}
},
"description": "The earlier version. Exactly one of text, url or content_base64.",
"additionalProperties": false
},
"b": {
"type": "object",
"properties": {
"url": {
"type": "string",
"maxLength": 2048,
"description": "Public http(s) URL of a PDF, DOCX, ODT, HTML or text file. Private and local addresses are refused."
},
"text": {
"type": "string",
"maxLength": 200000,
"description": "The text directly. Cheapest and clearest — its length is billed as counted here."
},
"format": {
"enum": [
"auto",
"pdf",
"docx",
"odt",
"html",
"markdown",
"rtf",
"text"
],
"type": "string",
"default": "auto",
"description": "Override the detected format. \"auto\" reads it from the bytes."
},
"filename": {
"type": "string",
"maxLength": 260,
"description": "Only consulted when the bytes carry no recognisable signature."
},
"content_base64": {
"type": "string",
"maxLength": 4000000,
"description": "The file inline, base64."
}
},
"description": "The later version. Same shape as a.",
"additionalProperties": false
},
"document_chars": {
"type": "integer",
"maximum": 24000,
"minimum": 1,
"description": "Only needed when a version arrives by url or content_base64: the combined length of both versions in characters, which is what you are billed for. Longer text is refused with the real length and nothing is charged."
},
"ignore_whitespace": {
"type": "boolean",
"default": true,
"description": "Treat runs of spaces and tabs as one space before comparing."
},
"max_changes_described": {
"type": "integer",
"default": 25,
"maximum": 60,
"minimum": 1,
"description": "How many changed passages the model describes. Beyond this the passages still come back with their before and after text, only without a description — what is dropped is counted, never silently cut."
},
"include_unchanged_count": {
"type": "boolean",
"default": true,
"description": "Report how many paragraphs stayed identical."
}
},
"additionalProperties": false
},
"price_basis": {
"unit": "1000 Zeichen",
"basis": "Zeichen des uebergebenen Textes, unmittelbar aus dem Rumpf gezaehlt.",
"units": 1,
"counted_chars": 0
},
"price_model": {
"kind": "per_unit",
"unit": "1000 Zeichen",
"max_usdc": "0.024",
"min_usdc": "0.004",
"max_units": 24,
"unit_price_usdc": "0.001"
},
"x402Version": 2,
"instructions": "Sign the accepted terms with an x402 client and repeat the request with the payment header.",
"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.
0.004USDC≈ $0.004 USD
on Base · exact scheme
Pay 0.004 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 4000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "4000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"a": {
"text": "§ 2 Laufzeit\nDer Vertrag laeuft zwoelf Monate.\n\n§ 5 Haftung\nDie Haftung ist auf den Auftragswert begrenzt."
},
"b": {
"text": "§ 2 Laufzeit\nDer Vertrag laeuft vierundzwanzig Monate.\n\n§ 5 Haftung\nDie Haftung ist auf den Auftragswert begrenzt.\n\n§ 8 Gerichtsstand\nGerichtsstand ist Berlin."
}
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$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": [
"a",
"b"
],
"properties": {
"a": {
"type": "object",
"properties": {
"url": {
"type": "string",
"maxLength": 2048,
"description": "Public http(s) URL of a PDF, DOCX, ODT, HTML or text file. Private and local addresses are refused."
},
"text": {
"type": "string",
"maxLength": 200000,
"description": "The text directly. Cheapest and clearest — its length is billed as counted here."
},
"format": {
"enum": [
"auto",
"pdf",
"docx",
"odt",
"html",
"markdown",
"rtf",
"text"
],
"type": "string",
"default": "auto",
"description": "Override the detected format. \"auto\" reads it from the bytes."
},
"filename": {
"type": "string",
"maxLength": 260,
"description": "Only consulted when the bytes carry no recognisable signature."
},
"content_base64": {
"type": "string",
"maxLength": 4000000,
"description": "The file inline, base64."
}
},
"description": "The earlier version. Exactly one of text, url or content_base64.",
"additionalProperties": false
},
"b": {
"type": "object",
"properties": {
"url": {
"type": "string",
"maxLength": 2048,
"description": "Public http(s) URL of a PDF, DOCX, ODT, HTML or text file. Private and local addresses are refused."
},
"text": {
"type": "string",
"maxLength": 200000,
"description": "The text directly. Cheapest and clearest — its length is billed as counted here."
},
"format": {
"enum": [
"auto",
"pdf",
"docx",
"odt",
"html",
"markdown",
"rtf",
"text"
],
"type": "string",
"default": "auto",
"description": "Override the detected format. \"auto\" reads it from the bytes."
},
"filename": {
"type": "string",
"maxLength": 260,
"description": "Only consulted when the bytes carry no recognisable signature."
},
"content_base64": {
"type": "string",
"maxLength": 4000000,
"description": "The file inline, base64."
}
},
"description": "The later version. Same shape as a.",
"additionalProperties": false
},
"document_chars": {
"type": "integer",
"maximum": 24000,
"minimum": 1,
"description": "Only needed when a version arrives by url or content_base64: the combined length of both versions in characters, which is what you are billed for. Longer text is refused with the real length and nothing is charged."
},
"ignore_whitespace": {
"type": "boolean",
"default": true,
"description": "Treat runs of spaces and tabs as one space before comparing."
},
"max_changes_described": {
"type": "integer",
"default": 25,
"maximum": 60,
"minimum": 1,
"description": "How many changed passages the model describes. Beyond this the passages still come back with their before and after text, only without a description — what is dropped is counted, never silently cut."
},
"include_unchanged_count": {
"type": "boolean",
"default": true,
"description": "Report how many paragraphs stayed identical."
}
},
"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
- 2026-08-11 14:21Z
- Last indexed by Roundhouse
- 2026-09-10 14:00Z
- Last enriched (probe, favicon, geo)
- 2026-09-21 05:15Z
- 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. 18 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 buero.halowerk.com 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=buero.halowerk.com' 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://buero.halowerk.com/v1/terms-diff, 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.