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URL Port Policy Check
x402
URL Port Policy Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-13).
Validates a URL's effective port against a caller-supplied allowlist and returns a deterministic pass/advisory verdict as versioned JSON
Price / call$0.001
Success—
StatusUnknown
How this service works
URL Port Policy Check: URL Port Policy Check checks a URL effective port against a caller allowlist from bounded caller-supplied values without an external provider. Call URL Port Policy Check before accepting, caching, redirecting, or retrying a caller-supplied web response. Returns normalized web evidence, the computed finding, and an explicit pass or advisory status for URL Port Policy Check as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memory-…
Output
Returns a versioned deterministic JSON object containing: the normalized URL evidence (extracted port info), the computed policy finding, and an explicit pass or advisory status indicating whether the URL's effective port is within the caller-supplied allowlist.
Example use cases
Block non-standard ports in agent pipeline
“I'm about to follow a redirect to 'http://internal.service.com:9000/data' — can you check whether port 9000 is allowed given my allowlist of [80, 443] and tell me if I should proceed?”
Validate user-submitted webhook URL port
“A user submitted the webhook URL 'https://myapp.io:8443/webhook' — check if that port is on my approved list of [443, 8443] before I save it to the database.”
Enforce port policy before retrying failed request
“I need to retry a failed request to 'http://api.partner.com:3000/v1/status' — first check if port 3000 is in my allowed ports [80, 443, 3000, 8080] and give me a pass or advisory verdict.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/url-port-policy-checkWhen to prefer
Use this endpoint when you need a stateless, deterministic, first-party port policy check on a caller-supplied URL without building your own parsing logic. Ideal before accepting, caching, redirecting, or retrying any external URL in an agent pipeline where port enforcement is a security requirement. Prefer this over general URL validation endpoints when port allowlisting is specifically needed, and over custom code when you want versioned, auditable JSON output with explicit pass/advisory verdicts.
Side effects
- URL is malformed or unparseable — endpoint may return an error or advisory status
- allowed_ports array exceeds 256 items — rejected per schema constraints
- URL string exceeds 8192 characters — rejected per schema constraints
- URL has no explicit port and default port inference may vary
- Non-integer values in allowed_ports array cause validation errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | URL supplied to URL Port Policy Check; used only for this bounded calculation and processed in memory without retention. |
| allowed_ports | array | Allowed Ports supplied to URL Port Policy Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"allowed": true,
"effective_port": 8443
},
"schema": "delx/util-url-port-policy-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "3c3ea04a21ed18c950af0adf058569fc48c74f8beaa16d9066f239014d36a638",
"external_calls": 0
},
"operation": "web_reliability:url_port_policy_check"
}
}Tags
x402
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