research.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
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.
$0.0020
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 07:49Z
—
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://research.halowerk.com/llms.txt",
"name": "grounding_score",
"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://research.halowerk.com/pricing",
"resource": {
"url": "https://research.halowerk.com/v1/grounding-score",
"mimeType": "application/json",
"description": "Splits the answer into sentences and measures, for each one, how much of it is covered by the supplied sources. Coverage is asymmetric on purpose: the question is what share of the statement appears in the source, so a long source can fully cover a short claim, and it combines single-word overlap with word-pair overlap because the same words in a different order can mean something else. Two checks override coverage and this is the point of the endpoint."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"answer": "Das Unternehmen wurde 1994 gegruendet. Der Umsatz lag zuletzt bei 12 Millionen Euro.",
"sources": [
{
"id": "q1",
"text": "Die Firma wurde im Jahr 1994 in Muenster gegruendet und beschaeftigt heute 80 Personen."
}
]
},
"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": [
"answer",
"sources"
],
"properties": {
"answer": {
"type": "string",
"maxLength": 40000,
"minLength": 10,
"description": "The answer or text to be checked against the sources."
},
"sources": {
"type": "array",
"items": {
"type": "object",
"required": [
"text"
],
"properties": {
"id": {
"type": "string",
"maxLength": 100,
"description": "Optional identifier, echoed back on every match."
},
"url": {
"type": "string",
"maxLength": 2000,
"description": "Optional origin, passed through unchanged."
},
"text": {
"type": "string",
"maxLength": 200000,
"minLength": 1,
"description": "Full text of the source."
}
},
"additionalProperties": false
},
"maxItems": 50,
"minItems": 1,
"description": "The sources the answer is supposed to rest on."
},
"min_coverage": {
"type": "number",
"default": 0.6,
"maximum": 1,
"minimum": 0.1,
"description": "Coverage from which a sentence counts as supported. Default 0.6."
}
},
"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": "Splits the answer into sentences and measures, for each one, how much of it is covered by the supplied sources. Coverage is asymmetric on purpose: the question is what share of the statement appears in the source, so a long source can fully cover a short claim, and it combines single-word overlap with word-pair overlap because the same words in a different order can mean something else. Two checks override coverage and this is the point of the endpoint. Negation is compared separately, so a sentence that matches its source almost perfectly but flips a not is reported as a possible contradiction rather than as supported, no matter how high the overlap. Numbers, years, percentages and amounts are extracted and looked for in the matched source, because an invented figure is the most expensive error in a generated answer and the one plain word overlap cannot see, since the sentence around it is correct. German and English decimal styles are folded together so the same number is not counted twice. Every claim carries its best source, its score, the matched phrase and a verdict; the overall grounding_score weights supported at one and weakly supported at one half. The endpoint measures textual coverage, not logical entailment, and supported here means the sentence stands in the source you provided, never that the source is right. No network access and no language model is involved.",
"inputSchema": {
"type": "object",
"required": [
"answer",
"sources"
],
"properties": {
"answer": {
"type": "string",
"maxLength": 40000,
"minLength": 10,
"description": "The answer or text to be checked against the sources."
},
"sources": {
"type": "array",
"items": {
"type": "object",
"required": [
"text"
],
"properties": {
"id": {
"type": "string",
"maxLength": 100,
"description": "Optional identifier, echoed back on every match."
},
"url": {
"type": "string",
"maxLength": 2000,
"description": "Optional origin, passed through unchanged."
},
"text": {
"type": "string",
"maxLength": 200000,
"minLength": 1,
"description": "Full text of the source."
}
},
"additionalProperties": false
},
"maxItems": 50,
"minItems": 1,
"description": "The sources the answer is supposed to rest on."
},
"min_coverage": {
"type": "number",
"default": 0.6,
"maximum": 1,
"minimum": 0.1,
"description": "Coverage from which a sentence counts as supported. Default 0.6."
}
},
"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≈ $0.002 USD
on Base · exact scheme
Pay 0.002 USDC on Base to 0x2880…C4E5E. The signed payment is good for 5 minutes.
- Paid to
- 0x2880…C4E5E
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 2000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"asset": "USDC",
"version": "2",
"eip712Domain": {
"name": "USD Coin",
"chainId": 8453,
"version": "2",
"verifyingContract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
},
"network_name": "Base Mainnet",
"assetTransferMethod": "eip3009"
},
"payTo": "0x2880EdfFF13100677Bf97A3CBdF3Bc34771C4E5E",
"amount": "2000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"answer": "Das Unternehmen wurde 1994 gegruendet. Der Umsatz lag zuletzt bei 12 Millionen Euro.",
"sources": [
{
"id": "q1",
"text": "Die Firma wurde im Jahr 1994 in Muenster gegruendet und beschaeftigt heute 80 Personen."
}
]
},
"type": "http",
"method": "POST",
"bodyType": "json"
}
},
"schema": {
"type": "object",
"$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": [
"answer",
"sources"
],
"properties": {
"answer": {
"type": "string",
"maxLength": 40000,
"minLength": 10,
"description": "The answer or text to be checked against the sources."
},
"sources": {
"type": "array",
"items": {
"type": "object",
"required": [
"text"
],
"properties": {
"id": {
"type": "string",
"maxLength": 100,
"description": "Optional identifier, echoed back on every match."
},
"url": {
"type": "string",
"maxLength": 2000,
"description": "Optional origin, passed through unchanged."
},
"text": {
"type": "string",
"maxLength": 200000,
"minLength": 1,
"description": "Full text of the source."
}
},
"additionalProperties": false
},
"maxItems": 50,
"minItems": 1,
"description": "The sources the answer is supposed to rest on."
},
"min_coverage": {
"type": "number",
"default": 0.6,
"maximum": 1,
"minimum": 0.1,
"description": "Coverage from which a sentence counts as supported. Default 0.6."
}
},
"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 07:49Z
- Last indexed by Roundhouse
- 2026-09-11 07:30Z
- Last enriched (probe, favicon, geo)
- 2026-09-21 08:45Z
- 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. 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 research.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=research.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://research.halowerk.com/v1/grounding-score, 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.