# LineageLint x402 Challenge Audit

> LineageLint x402 Challenge Audit is a paid API for AI agents from 47-85-47-24.sslip.io, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-13).

Audits and validates an x402 payment challenge payload, scoring its risk, checking policy compliance, and returning a PASS/WARN/BLOCK verdict with detailed findings.

## Facts

- Endpoint: GET https://47-85-47-24.sslip.io/v1/x402-challenge-audit
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lineagelint-x402-challenge-audit-84bf729d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LQnoKElrTu08TClC-9fsp

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 lineagelint-x402-challenge-audit-84bf729d
```

Example prompt: Can you audit the x402 payment challenge this API returned and tell me if it's safe to pay — give me the verdict, risk score, and whether it's automation-ready?

## When to prefer this

Use this endpoint when you need to programmatically audit an x402 payment challenge before deciding whether to pay it — especially in automated agent workflows where you want a machine-readable PASS/WARN/BLOCK verdict, policy compliance checks, and a risk score rather than inspecting the raw challenge yourself. Prefer this over manual inspection when safety, budget compliance, and recipient binding need to be verified at scale.

## Known failure modes

- Invalid or missing HTTP method in request — returns 400
- Challenge payload not present or malformed — may return BLOCK verdict with findings
- Unsupported protocol version — reflected in checks.supported_version=false and elevated risk_score
- No policy-safe payment options found — verdict WARN or BLOCK
- Payment before analysis completes — 402 response requiring USDC payment first

## How this service works

An autonomous paid API accepting USDC on Base mainnet.

## Output

A JSON object containing: a verdict (PASS, WARN, or BLOCK), a risk_score (0-100), an automation_ready boolean, a list of findings (issues found), a checks object (policy compliance flags like within_budget, recipient_bound, supported_version), normalized payment options with asset/network/amount details, a coverage report describing how the challenge was analyzed, and policy metadata including expected asset, network, and max USDC amount.

## 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",
     "properties": {},
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "analyzer",
      "label",
      "protocol_version",
      "verdict",
      "automation_ready",
      "risk_score",
      "accepted_option_count",
      "policy_safe_option_count",
      "findings",
      "checks",
      "normalized_options",
      "policy",
      "coverage"
     ],
     "properties": {
      "label": {
       "type": "string"
      },
      "checks": {
       "type": "object"
      },
      "policy": {
       "type": "object"
      },
      "verdict": {
       "enum": [
        "BLOCK",
        "WARN",
        "PASS"
       ],
       "type": "string"
      },
      "analyzer": {
       "type": "string"
      },
      "coverage": {
       "type": "object"
      },
      "findings": {
       "type": "array",
       "items": {
        "type": "object"
       }
      },
      "risk_score": {
       "type": "integer",
       "maximum": 100,
       "minimum": 0
      },
      "automation_ready": {
       "type": "boolean"
      },
      "protocol_version": {
       "type": [
        "integer",
        "null"
       ]
      },
      "normalized_options": {
       "type": "array",
       "items": {
        "type": "object"
       }
      },
      "accepted_option_count": {
       "type": "integer",
       "minimum": 0
      },
      "policy_safe_option_count": {
       "type": "integer",
       "minimum": 0
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "label": "paid-example:x402-challenge",
  "checks": {
   "within_budget": true,
   "recipient_bound": true,
   "supported_version": true,
   "has_payment_options": true,
   "has_policy_safe_option": true,
   "bazaar_metadata_complete": true
  },
  "policy": {
   "expected_asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
   "require_bazaar": true,
   "expected_pay_to": null,
   "max_amount_usdc": "0.05",
   "expected_network": "eip155:8453",
   "max_timeout_seconds": 300
  },
  "verdict": "PASS",
  "analyzer": "x402-challenge-audit/1.0",
  "coverage": {
   "source_format": "json-object",
   "challenge_bytes": 468,
   "challenge_sha256": "e2be325f2158ef5cf381a24934582e8e6a7321a3f58ff30aeb19db175984db42",
   "wallet_or_signature_used": false,
   "external_targets_contacted": false,
   "original_challenge_returned": false
  },
  "findings": [],
  "risk_score": 0,
  "automation_ready": true,
  "protocol_version": 2,
  "normalized_options": [
   {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "pay_to": "0x1111111111111111111111111111111111111111",
    "scheme": "exact",
    "network": "eip155:8453",
    "amount_usdc": "0.05",
    "policy_safe": true,
    "amount_atomic": "50000",
    "max_timeout_seconds": 300
   }
  ],
  "accepted_option_count": 1,
  "policy_safe_option_count": 1
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lineagelint-x402-challenge-audit-84bf729d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 47-85-47-24.sslip.io](https://www.zero.xyz/host/47-85-47-24.sslip.io/llms.txt)