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.
SearchLiveeip155:8453Exactvia cdp
Calls · 30d
2→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 17 snapshots so far.
$11.50
Verified settled volume
2,672 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.
2
Calls · 30d
Upstream's own call count for this endpoint, not ours.
1
Unique payers · 30d
Last called 2026-08-11 16:32Z
—
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": "availability_resolve",
"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://buero.halowerk.com/pricing",
"resource": {
"url": "https://buero.halowerk.com/v1/availability-resolve",
"mimeType": "application/json",
"description": "Give it a search window, a meeting length, and for each participant a list of busy blocks — start and end, nothing else — and it returns the windows in which the meeting fits. Each participant carries their own IANA timezone and working hours, so nine-to-five means nine-to-five where they are, across daylight saving changes, and a meeting is only offered when it lies entirely inside one working-hours block for everyone counted as present."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"window": {
"end": "2026-08-19T00:00:00Z",
"start": "2026-08-17T00:00:00Z"
},
"participants": [
{
"id": "a",
"busy": [
{
"end": "2026-08-17T10:00:00Z",
"start": "2026-08-17T08:00:00Z"
}
],
"timezone": "Europe/Berlin"
},
{
"id": "b",
"busy": [],
"timezone": "America/New_York"
}
],
"working_hours": {
"end": "17:00",
"start": "09:00"
},
"output_timezone": "Europe/Berlin",
"duration_minutes": 60
},
"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": [
"participants",
"window",
"duration_minutes"
],
"properties": {
"window": {
"type": "object",
"required": [
"start",
"end"
],
"properties": {
"end": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601."
},
"start": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601."
}
},
"description": "The search window. Every load figure is measured over exactly this span for everyone.",
"additionalProperties": false
},
"max_results": {
"type": "integer",
"default": 20,
"maximum": 100,
"minimum": 1,
"description": "How many windows to return. What is dropped is counted."
},
"participants": {
"type": "array",
"items": {
"type": "object",
"required": [
"id"
],
"properties": {
"id": {
"type": "string",
"maxLength": 80,
"minLength": 1,
"description": "Any label, unique within the request. \"a\" is fine."
},
"busy": {
"type": "array",
"items": {
"type": "object",
"required": [
"start",
"end"
],
"properties": {
"end": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601 with offset or Z."
},
"start": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601 with offset or Z."
}
},
"additionalProperties": false
},
"maxItems": 300,
"description": "Busy blocks. Overlapping blocks are merged."
},
"optional": {
"type": "boolean",
"default": false,
"description": "Optional participants may be missing from a returned window."
},
"timezone": {
"type": "string",
"maxLength": 60,
"description": "IANA zone for this person, e.g. Europe/Berlin. Falls back to the request default."
},
"working_hours": {
"type": "object",
"properties": {
"end": {
"type": "string",
"maxLength": 5,
"description": "HH:MM. An end before the start means the block runs past midnight."
},
"days": {
"type": "array",
"items": {
"type": "integer",
"maximum": 6,
"minimum": 0
},
"maxItems": 7,
"description": "0 is Sunday, 6 is Saturday. Default Monday to Friday."
},
"start": {
"type": "string",
"maxLength": 5,
"description": "HH:MM, e.g. 09:00."
}
},
"description": "Working hours in this person local time. Omit to use the request default.",
"additionalProperties": false
}
},
"additionalProperties": false
},
"maxItems": 20,
"minItems": 1,
"description": "One entry per person. Identifiers are free text and need not be real names."
},
"min_attendees": {
"type": "integer",
"minimum": 1,
"description": "Also return windows where only this many can attend. Default: everyone who is not optional."
},
"working_hours": {
"type": "object",
"properties": {
"end": {
"type": "string",
"maxLength": 5
},
"days": {
"type": "array",
"items": {
"type": "integer",
"maximum": 6,
"minimum": 0
},
"maxItems": 7
},
"start": {
"type": "string",
"maxLength": 5
}
},
"description": "Default working hours for participants that do not name their own. Omit both this and per-participant hours to search around the clock.",
"additionalProperties": false
},
"output_timezone": {
"type": "string",
"maxLength": 60,
"description": "Additionally render every returned time in this zone. Defaults to default_timezone."
},
"default_timezone": {
"type": "string",
"default": "UTC",
"maxLength": 60,
"description": "Timezone for participants that do not name one."
},
"duration_minutes": {
"type": "integer",
"maximum": 1440,
"minimum": 5,
"description": "How long the meeting needs to be."
},
"granularity_minutes": {
"enum": [
5,
10,
15,
20,
30,
60
],
"type": "integer",
"default": 15,
"description": "Step of the candidate grid. Start times fall on this grid."
},
"ignore_working_hours": {
"type": "boolean",
"default": false,
"description": "Search the whole window regardless of working hours."
}
},
"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": "Give it a search window, a meeting length, and for each participant a list of busy blocks — start and end, nothing else — and it returns the windows in which the meeting fits. Each participant carries their own IANA timezone and working hours, so nine-to-five means nine-to-five where they are, across daylight saving changes, and a meeting is only offered when it lies entirely inside one working-hours block for everyone counted as present. Windows are returned with the participants who can attend, those who cannot, and a rank that puts full attendance first and the earliest slot next; setting min_attendees or marking participants as optional produces partial windows too, each labelled with exactly who is missing. Alongside the windows every participant gets a load figure — busy minutes, free minutes inside working hours, and a percentage — and all of them are measured over the identical search window, because a percentage from a two-week sample set beside one from three weeks compares nothing. The input is deliberately impoverished: it takes no calendar credentials, no event titles, no attendee names, no location, and an identifier may be a single letter. Nothing is stored beyond the response. What it does not do is decide: it will not rank by anyone seniority, guess which meeting may be moved, or read a busy block as tentative — a block is busy, and a slot that fits is offered without any claim that it is a good time.",
"inputSchema": {
"type": "object",
"required": [
"participants",
"window",
"duration_minutes"
],
"properties": {
"window": {
"type": "object",
"required": [
"start",
"end"
],
"properties": {
"end": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601."
},
"start": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601."
}
},
"description": "The search window. Every load figure is measured over exactly this span for everyone.",
"additionalProperties": false
},
"max_results": {
"type": "integer",
"default": 20,
"maximum": 100,
"minimum": 1,
"description": "How many windows to return. What is dropped is counted."
},
"participants": {
"type": "array",
"items": {
"type": "object",
"required": [
"id"
],
"properties": {
"id": {
"type": "string",
"maxLength": 80,
"minLength": 1,
"description": "Any label, unique within the request. \"a\" is fine."
},
"busy": {
"type": "array",
"items": {
"type": "object",
"required": [
"start",
"end"
],
"properties": {
"end": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601 with offset or Z."
},
"start": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601 with offset or Z."
}
},
"additionalProperties": false
},
"maxItems": 300,
"description": "Busy blocks. Overlapping blocks are merged."
},
"optional": {
"type": "boolean",
"default": false,
"description": "Optional participants may be missing from a returned window."
},
"timezone": {
"type": "string",
"maxLength": 60,
"description": "IANA zone for this person, e.g. Europe/Berlin. Falls back to the request default."
},
"working_hours": {
"type": "object",
"properties": {
"end": {
"type": "string",
"maxLength": 5,
"description": "HH:MM. An end before the start means the block runs past midnight."
},
"days": {
"type": "array",
"items": {
"type": "integer",
"maximum": 6,
"minimum": 0
},
"maxItems": 7,
"description": "0 is Sunday, 6 is Saturday. Default Monday to Friday."
},
"start": {
"type": "string",
"maxLength": 5,
"description": "HH:MM, e.g. 09:00."
}
},
"description": "Working hours in this person local time. Omit to use the request default.",
"additionalProperties": false
}
},
"additionalProperties": false
},
"maxItems": 20,
"minItems": 1,
"description": "One entry per person. Identifiers are free text and need not be real names."
},
"min_attendees": {
"type": "integer",
"minimum": 1,
"description": "Also return windows where only this many can attend. Default: everyone who is not optional."
},
"working_hours": {
"type": "object",
"properties": {
"end": {
"type": "string",
"maxLength": 5
},
"days": {
"type": "array",
"items": {
"type": "integer",
"maximum": 6,
"minimum": 0
},
"maxItems": 7
},
"start": {
"type": "string",
"maxLength": 5
}
},
"description": "Default working hours for participants that do not name their own. Omit both this and per-participant hours to search around the clock.",
"additionalProperties": false
},
"output_timezone": {
"type": "string",
"maxLength": 60,
"description": "Additionally render every returned time in this zone. Defaults to default_timezone."
},
"default_timezone": {
"type": "string",
"default": "UTC",
"maxLength": 60,
"description": "Timezone for participants that do not name one."
},
"duration_minutes": {
"type": "integer",
"maximum": 1440,
"minimum": 5,
"description": "How long the meeting needs to be."
},
"granularity_minutes": {
"enum": [
5,
10,
15,
20,
30,
60
],
"type": "integer",
"default": 15,
"description": "Step of the candidate grid. Start times fall on this grid."
},
"ignore_working_hours": {
"type": "boolean",
"default": false,
"description": "Search the whole window regardless of working hours."
}
},
"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.",
"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≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"window": {
"end": "2026-08-19T00:00:00Z",
"start": "2026-08-17T00:00:00Z"
},
"participants": [
{
"id": "a",
"busy": [
{
"end": "2026-08-17T10:00:00Z",
"start": "2026-08-17T08:00:00Z"
}
],
"timezone": "Europe/Berlin"
},
{
"id": "b",
"busy": [],
"timezone": "America/New_York"
}
],
"working_hours": {
"end": "17:00",
"start": "09:00"
},
"output_timezone": "Europe/Berlin",
"duration_minutes": 60
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$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": [
"participants",
"window",
"duration_minutes"
],
"properties": {
"window": {
"type": "object",
"required": [
"start",
"end"
],
"properties": {
"end": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601."
},
"start": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601."
}
},
"description": "The search window. Every load figure is measured over exactly this span for everyone.",
"additionalProperties": false
},
"max_results": {
"type": "integer",
"default": 20,
"maximum": 100,
"minimum": 1,
"description": "How many windows to return. What is dropped is counted."
},
"participants": {
"type": "array",
"items": {
"type": "object",
"required": [
"id"
],
"properties": {
"id": {
"type": "string",
"maxLength": 80,
"minLength": 1,
"description": "Any label, unique within the request. \"a\" is fine."
},
"busy": {
"type": "array",
"items": {
"type": "object",
"required": [
"start",
"end"
],
"properties": {
"end": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601 with offset or Z."
},
"start": {
"type": "string",
"maxLength": 40,
"description": "ISO 8601 with offset or Z."
}
},
"additionalProperties": false
},
"maxItems": 300,
"description": "Busy blocks. Overlapping blocks are merged."
},
"optional": {
"type": "boolean",
"default": false,
"description": "Optional participants may be missing from a returned window."
},
"timezone": {
"type": "string",
"maxLength": 60,
"description": "IANA zone for this person, e.g. Europe/Berlin. Falls back to the request default."
},
"working_hours": {
"type": "object",
"properties": {
"end": {
"type": "string",
"maxLength": 5,
"description": "HH:MM. An end before the start means the block runs past midnight."
},
"days": {
"type": "array",
"items": {
"type": "integer",
"maximum": 6,
"minimum": 0
},
"maxItems": 7,
"description": "0 is Sunday, 6 is Saturday. Default Monday to Friday."
},
"start": {
"type": "string",
"maxLength": 5,
"description": "HH:MM, e.g. 09:00."
}
},
"description": "Working hours in this person local time. Omit to use the request default.",
"additionalProperties": false
}
},
"additionalProperties": false
},
"maxItems": 20,
"minItems": 1,
"description": "One entry per person. Identifiers are free text and need not be real names."
},
"min_attendees": {
"type": "integer",
"minimum": 1,
"description": "Also return windows where only this many can attend. Default: everyone who is not optional."
},
"working_hours": {
"type": "object",
"properties": {
"end": {
"type": "string",
"maxLength": 5
},
"days": {
"type": "array",
"items": {
"type": "integer",
"maximum": 6,
"minimum": 0
},
"maxItems": 7
},
"start": {
"type": "string",
"maxLength": 5
}
},
"description": "Default working hours for participants that do not name their own. Omit both this and per-participant hours to search around the clock.",
"additionalProperties": false
},
"output_timezone": {
"type": "string",
"maxLength": 60,
"description": "Additionally render every returned time in this zone. Defaults to default_timezone."
},
"default_timezone": {
"type": "string",
"default": "UTC",
"maxLength": 60,
"description": "Timezone for participants that do not name one."
},
"duration_minutes": {
"type": "integer",
"maximum": 1440,
"minimum": 5,
"description": "How long the meeting needs to be."
},
"granularity_minutes": {
"enum": [
5,
10,
15,
20,
30,
60
],
"type": "integer",
"default": 15,
"description": "Step of the candidate grid. Start times fall on this grid."
},
"ignore_working_hours": {
"type": "boolean",
"default": false,
"description": "Search the whole window regardless of working hours."
}
},
"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 16:32Z
- Last indexed by Roundhouse
- 2026-09-10 16:30Z
- Last enriched (probe, favicon, geo)
- 2026-09-21 04:45Z
- 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. 17 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/availability-resolve, 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.