# code402 ACI Trust Lookup

> code402 ACI Trust Lookup is a paid API for AI agents from hcrb.in, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).

Performs offline deterministic validation and trust-scoring of business identifiers (IBAN, LEI, VAT, ABA, ISBN, SEDOL, EIN, IFSC, SWIFT/BIC, etc.) and returns a tiered score with signed receipt, paid per call via x402 USDC micropayments.

## Facts

- Endpoint: POST https://hcrb.in/v1/tools/aci-trust-lookup/call?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/code402-aci-trust-lookup-091c4f03
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vw9rrKoYR0mkLx2-bCKd5

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 code402-aci-trust-lookup-091c4f03 -d '<json body>'
```

Example prompt: Can you run a trust check on LEI code 549300MLUDYVRQOOXS22 and tell me its tier and score? I need to verify this counterparty before we proceed.

## When to prefer this

Choose this endpoint when you need fast, deterministic, offline validation of structured business or financial identifiers (IBAN, LEI, VAT, ABA, SWIFT/BIC, EIN, SEDOL, ISBN, IFSC) without relying on ML models or live web scraping. Ideal for KYB onboarding pipelines, pre-trade securities checks, rental due-diligence, and compliance workflows where you need a signed, auditable receipt and a tiered trust score. Prefer this over ML-based or database-lookup services when offline checksum determinism and non-custodial receipts are required.

## Known failure modes

- Invalid or unrecognized identifier format returns ok:false with low score_bp
- Unsupported identifier standard returns an error or unscored result
- Payment failure via x402 blocks the call before processing
- Rate limit exceeded beyond 3 free daily calls without valid payment
- Malformed request body returns HTTP 400
- Network timeout if the endpoint is temporarily unavailable

## How this service works

Offline deterministic checks (no ML, no scraping) for business identifiers and rental due-diligence, paid per call via x402 (gasless EIP-3009 USDC on Base). Checksum-verifiable (IBAN, LEI, VAT, ABA, ISBN, SEDOL…) vs format-only (EIN, IFSC, SWIFT/BIC…) — every response returns a scope field. Non-custodial, signed receipts. First 3 calls/day free.

## Output

A JSON object containing: ok (boolean pass/fail), standard (identifier type e.g. ACI-1), subject (the queried identifier), tier (T1/T2/T3 trust level), score_bp (trust score in basis points 0-10000), evidence (supporting detail object), policy_notice, receipt_digest (non-custodial signed proof of the call), and unsettled_exposure_hint_minor (optional exposure amount in minor units). A scope field indicates whether the check was checksum-verifiable or format-only.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "subject"
   ],
   "properties": {
    "role": {
     "type": "string",
     "description": "Agent role: 'payer' or 'seller' (default 'payer')"
    },
    "subject": {
     "type": "string",
     "description": "Agent wallet address (0x...) or canonical ANS identifier (c402:...) to evaluate"
    },
    "first_seen_days": {
     "type": "number",
     "description": "Days since first active on-chain settlement"
    },
    "dispute_loss_rate": {
     "type": "number",
     "description": "Historical dispute loss rate 0.0 to 1.0"
    },
    "settled_calls_90d": {
     "type": "number",
     "description": "Number of settled transactions in the past 90 days"
    },
    "sponsor_attestations": {
     "type": "array",
     "description": "Array of signed sponsorship edges"
    },
    "settlement_success_rate": {
     "type": "number",
     "description": "Historical settlement success rate 0.0 to 1.0"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "required": [
   "ok",
   "standard",
   "subject",
   "tier",
   "score_bp"
  ],
  "properties": {
   "ok": {
    "type": "boolean"
   },
   "tier": {
    "type": "string"
   },
   "subject": {
    "type": "string"
   },
   "evidence": {
    "type": "object"
   },
   "score_bp": {
    "type": "number"
   },
   "standard": {
    "type": "string"
   },
   "policy_notice": {
    "type": "string"
   },
   "receipt_digest": {
    "type": "string"
   },
   "unsettled_exposure_hint_minor": {
    "type": "string"
   }
  }
 },
 "example": {
  "ok": true,
  "tier": "T2",
  "subject": "0x1111111111111111111111111111111111111111",
  "score_bp": 7500,
  "standard": "ACI-1",
  "unsettled_exposure_hint_minor": "100000000"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/code402-aci-trust-lookup-091c4f03/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from hcrb.in](https://www.zero.xyz/host/hcrb.in/llms.txt)