x402 Endpoint Preflight Inspector

x402

x402 Endpoint Preflight Inspector is a paid API for AI agents from base-agent-preflight.bytoken2023.workers.dev, paid per call via x402, $0.015002/call, status unknown (last checked 2026-10-10).

Inspects a public HTTP/HTTPS x402-payment-gated URL and returns risk assessment, network metadata, and safety flags without actually paying the endpoint's fee.

Price / call$0.015002

Seller volume →—

Success—

StatusUnknown

How this service works

Machine-payable service intelligence for discovering, verifying, and monitoring identity, risk, authorization, execution-preflight, and evidence APIs before autonomous agents spend.

Output

Returns a JSON object containing the Base network identifier (e.g. eip155:8453), product name, and an assessment object with a risk_score (numeric), risk_level (e.g. 'low'), and an array of flags describing any detected issues. May also include activity, identity, and provenance sub-objects with additional metadata about the endpoint.

Example use cases

Example prompt

“Before we pay for it, can you do a preflight safety check on this x402 endpoint — https://api.example.com/v1/some-paid-resource — and tell me the risk score and any flags it raises?”

Technical details

Endpoint

GEThttps://base-agent-preflight.bytoken2023.workers.dev/v1/x402/web/endpoint-preflight?utm_source=zero.xyz

When to prefer

Use this endpoint when an autonomous agent needs to evaluate an x402-gated URL before committing payment, specifically to get a machine-readable risk score and safety flags. Prefer this over generic URL checkers when working within the x402 payment protocol ecosystem on Base network, as it understands x402-specific metadata, identity, and provenance signals.

Side effects

URL is not a valid HTTP/HTTPS address — returns validation error
Target URL is unreachable or returns non-x402 response — may return empty or error assessment
URL exceeds 2048 character limit — schema validation failure
Non-GET method specified — rejected by schema constraint
Target endpoint is private or firewalled — inspection returns incomplete data

Output

Schema · Response

{
  "type": "json",
  "example": {
    "network": "eip155:8453",
    "product": "x402-endpoint-preflight",
    "assessment": {
      "flags": [],
      "risk_level": "low",
      "risk_score": 0
    }
  }
}

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