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.
OtherLiveeip155:8453Exactvia 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.
$11.50
Verified settled volume
2,672 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 2026-08-12 10:44Z
—
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": "port_congestion",
"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/port-congestion",
"mimeType": "application/json",
"description": "Reports what actually moves through a European port and how that developed, from the quarterly Eurostat port statistics covering 837 ports, addressable by name or by UN/LOCODE. Throughput is given per quarter split into inbound and outbound, with the imbalance between the two, the change against the same quarter a year earlier, and the direction over the whole observed window."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"port": "Hamburg",
"quarters": 8
},
"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": [
"port"
],
"properties": {
"lat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Optional: adds the OpenStreetMap handling infrastructure around this point."
},
"lon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Belongs with lat."
},
"port": {
"type": "string",
"maxLength": 60,
"minLength": 3,
"description": "Port name or UN/LOCODE, for example Hamburg, Rotterdam or DEHAM."
},
"quarters": {
"type": "integer",
"default": 8,
"maximum": 20,
"minimum": 4,
"description": "How many quarters of history to return."
},
"radius_km": {
"type": "number",
"default": 6,
"maximum": 25,
"minimum": 0.5,
"description": "Radius for the infrastructure count."
}
},
"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": "Reports what actually moves through a European port and how that developed, from the quarterly Eurostat port statistics covering 837 ports, addressable by name or by UN/LOCODE. Throughput is given per quarter split into inbound and outbound, with the imbalance between the two, the change against the same quarter a year earlier, and the direction over the whole observed window. When coordinates are supplied, the berths, cranes, terminals and quays recorded in OpenStreetMap around that point are counted as an indication of the handling capacity behind those tonnes. The endpoint is explicit about what it is not, because its name promises otherwise: it measures no waiting times and no ships at anchor, since that requires AIS and AIS is not available without a paid feed. More importantly it states in every response how old the newest figure is, because these statistics lag by two to three quarters, so the answer describes the load a port carried last year and says nothing about the queue outside it today. Both limits are carried as fields rather than footnotes, and the congestion assessment names the basis it rests on instead of implying a live measurement.",
"inputSchema": {
"type": "object",
"required": [
"port"
],
"properties": {
"lat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Optional: adds the OpenStreetMap handling infrastructure around this point."
},
"lon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Belongs with lat."
},
"port": {
"type": "string",
"maxLength": 60,
"minLength": 3,
"description": "Port name or UN/LOCODE, for example Hamburg, Rotterdam or DEHAM."
},
"quarters": {
"type": "integer",
"default": 8,
"maximum": 20,
"minimum": 4,
"description": "How many quarters of history to return."
},
"radius_km": {
"type": "number",
"default": 6,
"maximum": 25,
"minimum": 0.5,
"description": "Radius for the infrastructure count."
}
},
"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≈ $0.005 USD
on Base · exact scheme
Pay 0.005 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 5000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "5000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"port": "Hamburg",
"quarters": 8
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$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": [
"port"
],
"properties": {
"lat": {
"type": "number",
"maximum": 90,
"minimum": -90,
"description": "Optional: adds the OpenStreetMap handling infrastructure around this point."
},
"lon": {
"type": "number",
"maximum": 180,
"minimum": -180,
"description": "Belongs with lat."
},
"port": {
"type": "string",
"maxLength": 60,
"minLength": 3,
"description": "Port name or UN/LOCODE, for example Hamburg, Rotterdam or DEHAM."
},
"quarters": {
"type": "integer",
"default": 8,
"maximum": 20,
"minimum": 4,
"description": "How many quarters of history to return."
},
"radius_km": {
"type": "number",
"default": 6,
"maximum": 25,
"minimum": 0.5,
"description": "Radius for the infrastructure count."
}
},
"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
- 2026-08-12 10:44Z
- Last indexed by Roundhouse
- 2026-09-11 10:31Z
- Last enriched (probe, favicon, geo)
- 2026-09-21 09:15Z
- 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 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/port-congestion, 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.