karte.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.
TradingLiveeip155:8453Exactvia cdp
Calls · 30d
1→ 0%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 26 snapshots so far.
$11.48
Verified settled volume
2,658 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0050
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 2026-08-20 06:44Z
—
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://karte.halowerk.com/llms.txt",
"name": "trip_metrics",
"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": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
],
"pricing": "https://karte.halowerk.com/pricing",
"resource": {
"url": "https://karte.halowerk.com/v1/trip-metrics",
"mimeType": "application/json",
"description": "Takes an ordered list of positions with timestamps, optionally carrying the battery state of charge at each fix, and returns what a fleet operator asks of a trace: total distance over ground, how much of the elapsed time the vehicle was moving and how much it stood, each individual stop with its position and duration, the mean and maximum speed, and — where a battery capacity is supplied — the energy drawn and the consumption per kilometre."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"points": [
{
"lat": 52.52,
"lon": 13.405,
"time": "2026-08-19T08:00:00Z",
"soc_percent": 82
},
{
"lat": 52.515,
"lon": 13.39,
"time": "2026-08-19T08:04:00Z",
"soc_percent": 81.4
},
{
"lat": 52.515,
"lon": 13.39,
"time": "2026-08-19T08:12:00Z",
"soc_percent": 81.3
},
{
"lat": 52.51,
"lon": 13.37,
"time": "2026-08-19T08:18:00Z",
"soc_percent": 80.5
}
],
"stop_min_s": 120,
"stop_speed_kmh": 2,
"battery_capacity_kwh": 58
},
"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": [
"points"
],
"properties": {
"points": {
"type": "array",
"items": {
"type": "object",
"required": [
"lat",
"lon",
"time"
],
"properties": {
"lat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Latitude, WGS 84."
},
"lon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Longitude, WGS 84."
},
"time": {
"type": "string",
"maxLength": 40,
"minLength": 4,
"description": "ISO 8601 timestamp of the fix. Must not go backwards from one fix to the next."
},
"soc_percent": {
"type": "number",
"maximum": 100,
"minimum": 0,
"description": "Battery state of charge at this fix, in percent. Optional, and may be present on only some fixes."
}
},
"additionalProperties": false
},
"maxItems": 5000,
"minItems": 2,
"description": "The trace, in chronological order. At least two fixes."
},
"stop_min_s": {
"type": "integer",
"default": 120,
"maximum": 86400,
"minimum": 10,
"description": "Minimum duration of standing time before it is reported as a stop."
},
"max_speed_kmh": {
"type": "number",
"default": 250,
"maximum": 400,
"minimum": 1,
"description": "Plausibility limit. A segment implying more than this is rejected instead of summed."
},
"stop_speed_kmh": {
"type": "number",
"default": 2,
"maximum": 30,
"minimum": 0,
"description": "At or below this speed a segment counts as standing."
},
"battery_capacity_kwh": {
"type": "number",
"maximum": 1000,
"minimum": 0.1,
"description": "Usable battery capacity. Without it, energy is reported in percent of charge only, never in kWh."
}
},
"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": "0.005",
"description": "Takes an ordered list of positions with timestamps, optionally carrying the battery state of charge at each fix, and returns what a fleet operator asks of a trace: total distance over ground, how much of the elapsed time the vehicle was moving and how much it stood, each individual stop with its position and duration, the mean and maximum speed, and — where a battery capacity is supplied — the energy drawn and the consumption per kilometre. Nothing is fetched: the endpoint queries no map, no road network and no external service, so the same payload always yields the same numbers and no third-party outage can affect the result. Segments are classified before they are summed. A segment whose implied speed exceeds the plausibility limit is rejected rather than averaged in, because one bad fix in a tunnel otherwise adds kilometres that were never driven, and each rejection is returned with its index and the reason so the caller can see what was dropped instead of guessing why the total looks short. A segment with a repeated timestamp is treated the same way. Idle time is time below the standing-speed threshold; a stop is a run of such time that lasts at least the minimum stop duration, which is what separates a traffic light from a delivery. Distance is great-circle distance between consecutive fixes and is therefore a lower bound on the driven distance: the trace is not matched to a road network, so a curve sampled every two minutes is cut across. Consumption is derived from the reported state of charge, not measured, so it carries every error the vehicle reporting carries, and where the state of charge rises the endpoint reports the recovered share separately rather than netting it off and calling the difference consumption. Diagnostic trouble codes are deliberately out of scope in both directions: the authoritative code list is licensed, and a home-made translation would be either wrong or a licence breach.",
"inputSchema": {
"type": "object",
"required": [
"points"
],
"properties": {
"points": {
"type": "array",
"items": {
"type": "object",
"required": [
"lat",
"lon",
"time"
],
"properties": {
"lat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Latitude, WGS 84."
},
"lon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Longitude, WGS 84."
},
"time": {
"type": "string",
"maxLength": 40,
"minLength": 4,
"description": "ISO 8601 timestamp of the fix. Must not go backwards from one fix to the next."
},
"soc_percent": {
"type": "number",
"maximum": 100,
"minimum": 0,
"description": "Battery state of charge at this fix, in percent. Optional, and may be present on only some fixes."
}
},
"additionalProperties": false
},
"maxItems": 5000,
"minItems": 2,
"description": "The trace, in chronological order. At least two fixes."
},
"stop_min_s": {
"type": "integer",
"default": 120,
"maximum": 86400,
"minimum": 10,
"description": "Minimum duration of standing time before it is reported as a stop."
},
"max_speed_kmh": {
"type": "number",
"default": 250,
"maximum": 400,
"minimum": 1,
"description": "Plausibility limit. A segment implying more than this is rejected instead of summed."
},
"stop_speed_kmh": {
"type": "number",
"default": 2,
"maximum": 30,
"minimum": 0,
"description": "At or below this speed a segment counts as standing."
},
"battery_capacity_kwh": {
"type": "number",
"maximum": 1000,
"minimum": 0.1,
"description": "Usable battery capacity. Without it, energy is reported in percent of charge only, never in kWh."
}
},
"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.
0.005USDC≈ $0.005 USD
on Base · exact scheme
Pay 0.005 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 5000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"points": [
{
"lat": 52.52,
"lon": 13.405,
"time": "2026-08-19T08:00:00Z",
"soc_percent": 82
},
{
"lat": 52.515,
"lon": 13.39,
"time": "2026-08-19T08:04:00Z",
"soc_percent": 81.4
},
{
"lat": 52.515,
"lon": 13.39,
"time": "2026-08-19T08:12:00Z",
"soc_percent": 81.3
},
{
"lat": 52.51,
"lon": 13.37,
"time": "2026-08-19T08:18:00Z",
"soc_percent": 80.5
}
],
"stop_min_s": 120,
"stop_speed_kmh": 2,
"battery_capacity_kwh": 58
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$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": [
"points"
],
"properties": {
"points": {
"type": "array",
"items": {
"type": "object",
"required": [
"lat",
"lon",
"time"
],
"properties": {
"lat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Latitude, WGS 84."
},
"lon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Longitude, WGS 84."
},
"time": {
"type": "string",
"maxLength": 40,
"minLength": 4,
"description": "ISO 8601 timestamp of the fix. Must not go backwards from one fix to the next."
},
"soc_percent": {
"type": "number",
"maximum": 100,
"minimum": 0,
"description": "Battery state of charge at this fix, in percent. Optional, and may be present on only some fixes."
}
},
"additionalProperties": false
},
"maxItems": 5000,
"minItems": 2,
"description": "The trace, in chronological order. At least two fixes."
},
"stop_min_s": {
"type": "integer",
"default": 120,
"maximum": 86400,
"minimum": 10,
"description": "Minimum duration of standing time before it is reported as a stop."
},
"max_speed_kmh": {
"type": "number",
"default": 250,
"maximum": 400,
"minimum": 1,
"description": "Plausibility limit. A segment implying more than this is rejected instead of summed."
},
"stop_speed_kmh": {
"type": "number",
"default": 2,
"maximum": 30,
"minimum": 0,
"description": "At or below this speed a segment counts as standing."
},
"battery_capacity_kwh": {
"type": "number",
"maximum": 1000,
"minimum": 0.1,
"description": "Usable battery capacity. Without it, energy is reported in percent of charge only, never in kWh."
}
},
"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
- 2026-08-20 06:44Z
- Last indexed by Roundhouse
- 2026-09-19 06:40Z
- Last enriched (probe, favicon, geo)
- 2026-09-23 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
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 26 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 karte.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=karte.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://karte.halowerk.com/v1/trip-metrics, 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.