# x402 Seller Audit – On-Chain & Web Reputation Due Diligence

> x402 Seller Audit – On-Chain & Web Reputation Due Diligence is a paid API for AI agents from x402-endpoints.onrender.com, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-15).

Performs deep due diligence on an x402/ACP seller by wallet address or domain, fusing on-chain settlement reputation, OFAC screening, endpoint liveness, and web reputation into a TRUSTED/CAUTION/AVOID verdict with a signed, verifiable receipt.

## Facts

- Endpoint: GET https://x402-endpoints.onrender.com/x402/seller-audit
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-seller-audit-on-chain-web-reputation-due-diligence-37ba92c8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mPQ0AMlQv5nN6dWTAhIea

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 x402-seller-audit-on-chain-web-reputation-due-diligence-37ba92c8
```

Example prompt: Before I pay this seller, run a deep audit on 'api.example.com' — I want to know their on-chain settlement reputation, whether they're flagged on OFAC, any wash-trade or sybil signals, and whether their x402 endpoints are actually live. Use deep depth for the on-chain scan.

## When to prefer this

Use this endpoint when an AI agent needs to evaluate a new or unknown x402/ACP seller before executing a payment — especially when the stakes are non-trivial and a simple pass/fail badge is insufficient. Prefer this over generic OFAC screeners or token safety checkers when the subject is a payment API seller identified by wallet address or domain, and you need a fused multi-signal verdict (on-chain + compliance + liveness + web reputation) with a verifiable receipt.

## Known failure modes

- Invalid or unresolvable seller domain returns a 400 or error payload
- Malformed wallet address (not 0x + 40 hex) returns a validation error
- Seller has no on-chain history, resulting in a low-confidence verdict
- OFAC or web reputation data sources temporarily unavailable, causing partial results
- Rate limiting or payment failure returns 402 or 429
- Deep depth scan may time out for wallets with very sparse activity

## How this service works

Deep audit of an x402/ACP seller before trusting it: give a seller wallet or domain and get a full report — on-chain settlement reputation (settlements, unique counterparties, wash-trade/sybil, OFAC), the seller's advertised endpoints (from its /.well-known/x402.json), on-chain liveness, web reputation and red flags — fused into a TRUSTED/CAUTION/AVOID verdict with a signed, offline-verifiable receipt. Deeper than a pass/fail badge: the full seller due-diligence dossier for agentic payments.

## Output

Returns a structured due-diligence dossier including: a top-level TRUSTED/CAUTION/AVOID verdict, on-chain settlement statistics (volume, unique counterparties, wash-trade/sybil indicators), OFAC sanctions screening result, the seller's advertised x402 endpoints from /.well-known/x402.json, endpoint liveness checks, web reputation signals and red flags — plus a signed, offline-verifiable receipt of the audit.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "seller"
     ],
     "properties": {
      "depth": {
       "type": "string",
       "description": "On-chain depth: 'shallow' (~200 settlements) or 'deep' (~500)"
      },
      "seller": {
       "type": "string",
       "description": "Seller wallet (0x + 40 hex) or domain, e.g. 'api.example.com'"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "error": null,
  "query": {
   "depth": "shallow",
   "domain": null,
   "seller": "0x1D1B81247C407521E2A01F3E21514870dcf1620f",
   "resolved_wallet": "0x1D1B81247C407521E2A01F3E21514870dcf1620f"
  },
  "cached": false,
  "source": "Seller discovery + seller-trust + web signals + Claude Haiku",
  "reasons": [
   {
    "code": "ONCHAIN_VERDICT",
    "label": "On-chain seller-trust: TRUSTED (score 88)",
    "weight": -0.2
   }
  ],
  "summary": "Wallet shows a healthy, diverse on-chain settlement history with no OFAC or wash-trade signals; reputation is strong.",
  "verdict": "TRUSTED",
  "identity": {
   "domain": null,
   "discovery_error": "wallet input",
   "is_wallet_input": true,
   "resolved_wallet": "0x1D1B81247C407521E2A01F3E21514870dcf1620f",
   "discovery_available": false
  },
  "liveness": {
   "note": "Liveness from on-chain settlement recency (real), not home probing.",
   "available": true,
   "active_last_30d": true,
   "last_settlement": "2026-07-01T18:30:00Z",
   "wallet_age_days": 168,
   "last_settlement_age_seconds": 51300
  },
  "endpoints": {
   "count": 0,
   "advertised": []
  },
  "red_flags": [],
  "timestamp": "2026-07-02T12:00:00Z",
  "confidence": 0.78,
  "disclaimer": "Composed x402 seller audit from on-chain settlement data, advertised discovery and public web signals. Uptime not home-probed. Heuristic, not legal/financial advice.",
  "reputation": {
   "level": "strong",
   "notes": "Healthy diverse settlement graph, no sanctions or wash-trade signals."
  },
  "web_sources": [
   {
    "url": "https://x402-endpoints.onrender.com",
    "title": "x402-endpoints"
   }
  ],
  "data_freshness": {
   "mode": "llm",
   "as_of": "2026-07-02T12:00:00Z",
   "sources": [
    "seller discovery",
    "seller-trust",
    "web signals",
    "Claude Haiku"
   ],
   "age_seconds": 0,
   "retrieved_at": "2026-07-02T12:00:00Z",
   "deterministic": false
  },
  "recommendation": "Safe to transact; monitor for changes on large commitments.",
  "signed_receipt": {
   "claims": {
    "kind": "x402_seller_audit",
    "issuer": "x402-endpoints.onrender.com",
    "seller": "0x1D1B...620f",
    "verdict": "TRUSTED",
    "issued_at": "2026-07-02T12:00:00Z",
    "onchain_trust_score": 88,
    "endpoints_advertised": 0
   },
   "algorithm": "ed25519",
   "available": true,
   "signature": "<hex>",
   "public_key": "5b77...9f9d"
  },
  "directory_uptime": {
   "note": "Use on-chain settlement recency as liveness.",
   "r
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-seller-audit-on-chain-web-reputation-due-diligence-37ba92c8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-endpoints.onrender.com](https://www.zero.xyz/host/x402-endpoints.onrender.com/llms.txt)