# Saylor Innovations x402 Endpoint Audit

> Saylor Innovations x402 Endpoint Audit is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-26).

Audits an x402-gated URL before payment, returning compliance status, pricing details, supported networks, metadata, schema, and a risk score

## Facts

- Endpoint: GET https://saylorinnovations.com/api/x402check/audit?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-26
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-x402-endpoint-audit-6a592742
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_NQn0wvPBvsLy_XcubXGaj

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 saylor-innovations-x402-endpoint-audit-6a592742
```

Example prompt: Before I pay for it, can you audit the x402 endpoint at https://example.com/api/data and tell me its risk score, pricing, supported networks, and whether it's safe to call?

## When to prefer this

Use this endpoint when an AI agent is about to pay for an x402-gated resource and needs a pre-payment trust assessment. It is the only known dedicated audit/scoring service for x402 endpoints, offering compliance checking, pricing validation, network support verification, and risk scoring in a single call. Prefer this over manual inspection when automating agent workflows that dynamically discover and pay x402 APIs, especially when the provider is unknown or untrusted.

## Known failure modes

- URL parameter missing — returns validation error requiring the 'url' query parameter
- Target URL is unreachable or returns no x402 headers — may return low score with explanation
- Invalid or malformed URL provided — returns error or low-confidence assessment
- Target endpoint has no recognizable x402 metadata — audit may return minimal results with low score
- Rate limiting or upstream timeout — may return partial or error response

## How this service works

x402 endpoint buyer audit - compliance, pricing, networks, metadata, schema and risk score before payment

## Output

Returns a JSON object with the canonical URL, a numeric risk/quality score from 0–100, a text verdict summarizing the assessment, an array of reasons/evidence behind the verdict, pricing details, supported payment options, contract address, verification data, and strengths identified for the endpoint.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "the x402 resource URL to score before an agent pays it (query)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "url",
      "verdict",
      "score"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "Canonical URL"
      },
      "score": {
       "type": "number",
       "description": "Score from 0 (worst) to 100 (best)"
      },
      "pricing": {
       "type": "object"
      },
      "reasons": {
       "type": "array",
       "items": {
        "type": "string"
       },
       "description": "Evidence behind the verdict or score"
      },
      "verdict": {
       "type": "string",
       "description": "Overall assessment derived from the listed reasons"
      },
      "contract": {
       "type": "object",
       "description": "Contract address"
      },
      "strengths": {
       "type": "array",
       "items": {
        "type": "string"
       }
      },
      "verification": {
       "type": "object"
      },
      "payment_options": {
       "type": "object",
       "description": "Payment options"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-x402-endpoint-audit-6a592742/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)