2s.io Dev Preflight — Command URL Validator

x402

2s.io Dev Preflight — Command URL Validator is a paid API for AI agents from 2s.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-14).

Validates and preflights a shell command string by checking the target URLs it contains for reachability, TLS, DNS, HTTP method validity, and runnability.

Price / call$0.001

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StatusUnknown

How this service works

The (most) everything API: 575+ pay-per-call endpoints for AI agents — ground-truth data, a full AI gateway, and agent infrastructure (storage, queues, watchers). USDC via x402, no signup, no API keys, and upto billing: pay actual usage, not the quote.

Output

Returns a structured JSON object with a verdict ('runnable' or otherwise), per-check boolean results (schemeOk, urlValid, hostPresent, methodValid, privateTarget, tlsValid, dnsResolves, reachable, httpStatus), the parsed target URLs, the detected tool, the mode (static/live), and a reason if not runnable. Also includes total count and source/provider metadata.

Example use cases

Example prompt

“Before I run this command, can you preflight it and tell me if the URL is actually reachable, TLS is valid, and it's safe to execute: curl -sSL https://api.github.com/users/octocat — also do a live HEAD probe.”

Technical details

Endpoint

POSThttps://2s.io/api/dev/preflight?utm_source=zero.xyz

When to prefer

Use this endpoint when an AI agent needs to validate a shell command (especially curl/wget) before executing it, confirm target URL reachability, or check for security red flags like private-network targeting or invalid TLS. Prefer over generic URL checkers because it parses the full shell command syntax and understands tool-specific semantics.

Side effects

Invalid or unparseable command string returns a non-runnable verdict with a reason field
Target URL resolves to a private IP range — flagged as privateTarget: true
DNS does not resolve — dnsResolves: false
TLS certificate invalid — tlsValid: false
HTTP probe returns non-2xx status when live probe is enabled
Missing required 'command' field returns an error or empty items array

Input

{
  "probe": true,
  "command": "curl -sSL https://api.github.com/users/octocat"
}

Schema · Request body

Field	Type	Description
probe	boolean	Also do a live guarded HEAD probe (default false).
command	string	The shell command to check.

Output

{
  "data": {
    "ok": true,
    "items": [
      {
        "url": "https://api.github.com/users/octocat",
        "mode": "live",
        "note": "Live check: a guarded HEAD probe reached (or failed to reach) the target; the dialed IP is SSRF-validated, so private/rebinding targets are refused. Any HTTP response counts as runnable.",
        "tool": "curl",
        "checks": {
          "schemeOk": true,
          "tlsValid": true,
          "urlValid": true,
          "hasTarget": true,
          "reachable": true,
          "httpStatus": 200,
          "dnsResolves": true,
          "hostPresent": true,
          "methodValid": true,
          "privateTarget": false
        },
        "method": "GET",
        "reason": null,
        "source": {
          "url": "https://2s.io/dev/preflight",
          "license": "No upstream license — computed by 2s.io (optional live HEAD probe of the supplied target).",
          "provider": "2s.io command preflight"
        },
        "command": "curl -sSL https://api.github.com/users/octocat",
        "targets": [
          "https://api.github.com/users/octocat"
        ],
        "verdict": "runnable",
        "runnable": true
      }
    ],
    "total": 1,
    "source": {
      "url": "https://2s.io/dev/preflight",
      "license": "No upstream license — computed by 2s.io (optional live HEAD probe of the supplied target).",
      "provider": "2s.io command preflight"
    }
  },
  "meta": {
    "cost": {
      "usd": 0.001,
      "tier": 0
    },
    "caller": "x402",
    "version": null,
    "endpoint": "dev.preflight",
    "settlement": {
      "txHash": "0x34d43a1e5c692b88f7a807194ffe4d556177a52f1c0028331ac83233d89114be",
      "network": "eip155:8453",
      "success": true
    }
  }
}

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