# Halowerk Onchain Collateral Attestation

> Halowerk Onchain Collateral Attestation is a paid API for AI agents from stable.halowerk.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-23).

Analyzes caller-supplied evidence metrics to produce a confidence-scored attestation of onchain collateral adequacy, explicitly listing missing signals and classification thresholds.

## Facts

- Endpoint: POST https://stable.halowerk.com/v1/onchain-collateral-attestation?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/halowerk-onchain-collateral-attestation-7515b559
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KApXPTqGj7JAn6O4ZUbwr

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability halowerk-onchain-collateral-attestation-7515b559 -d '<json body>'
```

Example prompt: Can you run a collateral attestation on the address 0xA0b8...1234 using the evidence I have — collateral gap is 3.2%, proof is 18 hours old, and there's no issuer mismatch — and tell me the confidence score and any missing signals?

## When to prefer this

Choose this endpoint when you need a structured, auditable, confidence-scored attestation of collateral adequacy based on evidence you already hold — particularly when you need explicit threshold disclosure and missing-signal reporting for compliance, governance, or risk documentation purposes. It is not a live onchain query tool; prefer it when your agent has already gathered collateral metrics and needs a formal classification layer with traceable thresholds.

## Known failure modes

- minItems violation: evidence array is empty — request rejected
- strict mode enabled but one or more documented metrics absent — request rejected with list of missing fields
- metric value out of expected range — may lower confidence or trigger explicit warning
- subject field missing or empty — validation error
- evidence array exceeds 50 items — request rejected
- malformed ISO-8601 timestamp — field rejected or ignored

## How this service works

Onchain Collateral Attestation analyses only the evidence supplied by the caller. It does not claim to query a chain, identify a legal status or replace an independent audit. Missing signals lower confidence and are listed explicitly; every classification includes the exact thresholds used.

## Output

Returns a confidence-scored collateral attestation classification for the supplied subject, including the exact thresholds applied to each metric, a list of any missing or omitted signals that reduced confidence, and the classification verdict — without making any independent onchain queries.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "strict": {
   "type": "boolean",
   "default": false,
   "description": "Reject unless all documented metrics are supplied."
  },
  "context": {
   "type": "object",
   "description": "Optional non-secret labels returned unchanged for correlation.",
   "maxProperties": 20,
   "additionalProperties": {
    "type": [
     "string",
     "number",
     "boolean",
     "null"
    ]
   }
  },
  "subject": {
   "type": "string",
   "maxLength": 256,
   "minLength": 1,
   "description": "Address, transaction, protocol, asset, proposal or other subject being assessed."
  },
  "evidence": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "metric",
     "value"
    ],
    "properties": {
     "note": {
      "type": "string",
      "maxLength": 500
     },
     "value": {
      "type": [
       "number",
       "boolean"
      ]
     },
     "metric": {
      "enum": [
       "collateral_gap_pct",
       "proof_age_hours",
       "issuer_mismatch"
      ],
      "type": "string"
     },
     "source": {
      "type": "string",
      "maxLength": 300,
      "minLength": 1,
      "description": "Evidence source or query identifier."
     },
     "timestamp": {
      "type": "string",
      "maxLength": 40,
      "minLength": 10,
      "description": "ISO-8601 observation time."
     }
    },
    "additionalProperties": false
   },
   "maxItems": 50,
   "minItems": 1,
   "description": "Caller-supplied observations. Repeated metrics form a time series; the newest timestamp is assessed."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/halowerk-onchain-collateral-attestation-7515b559/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from stable.halowerk.com](https://www.zero.xyz/host/stable.halowerk.com/llms.txt)