HALOWERK marktwerk
HALOWERK provides paid endpoints that AI agents call and pay for per request via x402 on Base. No account, no API key, no signup.
MediaLiveeip155:8453Exactvia 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
2,655 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 18:18Z
—
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://markt.halowerk.com/llms.txt",
"name": "volume_anomaly",
"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://markt.halowerk.com/pricing",
"summary": "Checks up to twenty pairs for unusual trading volume against this hub own minute by minute history, using median and median absolute deviation, and returns the baseline behind every finding.",
"resource": {
"url": "https://markt.halowerk.com/anomaly/volume",
"iconUrl": "https://markt.halowerk.com/favicon.svg",
"mimeType": "application/json",
"description": "Compares the volume of the most recent completed minute candle with the distribution of minute volumes over the chosen lookback, taken from the history this hub records itself every minute. Median and median absolute deviation are used instead of mean and standard deviation because volume is skewed. Every finding carries its z value, the baseline median, the baseline MAD and the number of samples behind it, so it can be recomputed rather than believed. Pairs without a finding are returned in qui",
"serviceName": "HALOWERK marktwerk"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"symbols": [
"BTC/USDT"
]
},
"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": [
"symbols"
],
"properties": {
"venue": {
"enum": [
"binance",
"coinbase",
"kraken",
"okx",
"bybit"
],
"type": "string",
"default": "binance",
"description": "Exchange whose recorded history is used."
},
"symbols": {
"type": "array",
"items": {
"type": "string",
"pattern": "^[A-Za-z0-9]{2,15}/[A-Za-z0-9]{2,15}$"
},
"maxItems": 20,
"minItems": 1,
"description": "Pairs as BASE/QUOTE. Only pairs the collector of this hub watches can be answered; watched_pairs in the answer lists them.",
"uniqueItems": true
},
"lookback": {
"enum": [
"1h",
"4h",
"24h",
"7d"
],
"type": "string",
"default": "24h",
"description": "Length of the baseline window."
},
"sensitivity": {
"enum": [
"streng",
"normal",
"weit"
],
"type": "string",
"default": "normal",
"description": "Threshold on the robust z value: streng 5, normal 3.5, weit 2.5."
}
},
"additionalProperties": false
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
}
}
}
}
},
"price_usdc": "0.003",
"description": "Compares the volume of the most recent completed minute candle with the distribution of minute volumes over the chosen lookback, taken from the history this hub records itself every minute. Median and median absolute deviation are used instead of mean and standard deviation because volume is skewed. Every finding carries its z value, the baseline median, the baseline MAD and the number of samples behind it, so it can be recomputed rather than believed. Pairs without a finding are returned in quiet with their z as well: no finding is a result and is charged in full. Fewer than two hundred samples set confidence to niedrig and say so explicitly. Where the own history does not yet cover the requested window at all, the call answers with charged=false and names the date from which it will.",
"inputSchema": {
"type": "object",
"required": [
"symbols"
],
"properties": {
"venue": {
"enum": [
"binance",
"coinbase",
"kraken",
"okx",
"bybit"
],
"type": "string",
"default": "binance",
"description": "Exchange whose recorded history is used."
},
"symbols": {
"type": "array",
"items": {
"type": "string",
"pattern": "^[A-Za-z0-9]{2,15}/[A-Za-z0-9]{2,15}$"
},
"maxItems": 20,
"minItems": 1,
"description": "Pairs as BASE/QUOTE. Only pairs the collector of this hub watches can be answered; watched_pairs in the answer lists them.",
"uniqueItems": true
},
"lookback": {
"enum": [
"1h",
"4h",
"24h",
"7d"
],
"type": "string",
"default": "24h",
"description": "Length of the baseline window."
},
"sensitivity": {
"enum": [
"streng",
"normal",
"weit"
],
"type": "string",
"default": "normal",
"description": "Threshold on the robust z value: streng 5, normal 3.5, weit 2.5."
}
},
"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": {
"quiet": {
"type": "array",
"items": {
"type": "object"
}
},
"venue": {
"type": "string"
},
"age_ms": {
"type": [
"integer",
"null"
]
},
"method": {
"type": "string"
},
"hinweis": {
"type": "string"
},
"baseline": {
"type": "object"
},
"findings": {
"type": "array",
"items": {
"type": "object"
}
},
"lookback": {
"type": "string"
},
"confidence": {
"type": "string"
},
"no_history": {
"type": "array",
"items": {
"type": "object"
}
},
"ts_fetched": {
"type": "integer"
},
"watched_pairs": {
"type": "array",
"items": {
"type": "string"
}
},
"thresholds_used": {
"type": "object"
},
"unavailable_fields": {
"type": "array",
"items": {
"type": "string"
}
}
}
},
"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≈ $0.003 USD
on Base · exact scheme
Pay 0.003 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 3000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"symbols": [
"BTC/USDT"
]
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$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": [
"symbols"
],
"properties": {
"venue": {
"enum": [
"binance",
"coinbase",
"kraken",
"okx",
"bybit"
],
"type": "string",
"default": "binance",
"description": "Exchange whose recorded history is used."
},
"symbols": {
"type": "array",
"items": {
"type": "string",
"pattern": "^[A-Za-z0-9]{2,15}/[A-Za-z0-9]{2,15}$"
},
"maxItems": 20,
"minItems": 1,
"description": "Pairs as BASE/QUOTE. Only pairs the collector of this hub watches can be answered; watched_pairs in the answer lists them.",
"uniqueItems": true
},
"lookback": {
"enum": [
"1h",
"4h",
"24h",
"7d"
],
"type": "string",
"default": "24h",
"description": "Length of the baseline window."
},
"sensitivity": {
"enum": [
"streng",
"normal",
"weit"
],
"type": "string",
"default": "normal",
"description": "Threshold on the robust z value: streng 5, normal 3.5, weit 2.5."
}
},
"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 18:18Z
- Last indexed by Roundhouse
- 2026-09-08 18:00Z
- Last enriched (probe, favicon, geo)
- 2026-09-20 19:15Z
- 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. 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 marktwerk 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%20marktwerk' 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://markt.halowerk.com/anomaly/volume, 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.