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X402 Host Inspector
x402
X402 Host Inspector is a paid API for AI agents from x402.feld-feder.at, paid per call via x402, $0.005/call, status down (last checked 2026-09-15).
Inspects a target URL's DNS resolution, TLS certificate, and HTTP reachability in a single pay-per-request call.
Price / call$0.005
Success—
StatusDown
How this service works
Pay-per-request data tools for AI agents.
Output
Returns a structured JSON object containing: the resolved DNS hostname, port, and IP addresses; TLS details including protocol version, cipher suite, ALPN protocol, peer address, and full certificate info (subject, issuer, serial number, validity dates, SANs); HTTP response details; and a list of any warnings encountered during inspection.
Example use cases
TLS certificate audit before launch
“Before we go live, can you inspect https://checkout.mystore.com and tell me what TLS protocol and cipher it's using, who issued the certificate, and when it expires?”
Diagnose unreachable API endpoint
“Our integration with https://partner-api.example.org seems broken — can you check if the host resolves in DNS and whether HTTP is actually reachable?”
Security review of third-party vendor
“I need to vet a vendor's infrastructure — can you inspect https://data.vendorname.com and give me the full TLS certificate chain, IP addresses, and any warnings?”
Technical details
Endpoint
POSThttps://x402.feld-feder.at/v1/host/inspectWhen to prefer
Choose this endpoint when you need a combined DNS + TLS + HTTP probe in a single call without setting up your own infrastructure. Ideal for AI agents that need to validate external hosts, audit certificates, or diagnose connectivity issues on-demand with micropayment billing (no subscription required). Prefer over manual curl/dig workflows when the agent needs structured, machine-readable output about a host's network posture.
Side effects
- Invalid or unreachable URL returns null for TLS and HTTP fields with warnings populated
- Malformed URL input fails schema validation before reaching the network
- DNS resolution failure results in empty addresses array and warnings
- TLS handshake failure returns null tls field with warning details
- Payment of 0.005 USDC not provided causes HTTP 402 rejection before inspection runs
- URL exceeding 4096 characters rejected by schema validation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"dns": {
"port": 443,
"hostname": "example.com",
"addresses": [
"93.184.216.34"
]
},
"tls": null,
"http": null,
"warnings": [],
"target_url": "https://example.com"
}
}
}Tags
x402
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