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TLS Protocol Version Checker
x402
TLS Protocol Version Checker is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).
Checks and returns whether the negotiated TLS protocol on port 443 is TLS 1.2 or TLS 1.3 for a given host or URL.
Price / call$0.002
Success—
StatusUnknown
How this service works
Call when an agent needs whether the negotiated protocol on port 443 is TLS 1.2 or 1.3. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/tls-protocol first.
Output
Returns the negotiated TLS protocol version (e.g. TLS 1.2 or TLS 1.3) for the specified host or URL on port 443, reflecting the actual handshake outcome between client and server.
Example use cases
Security audit of vendor endpoints
“I need to verify what TLS version is negotiated when connecting to payments.acmecorp.com — can you check if it's using TLS 1.2 or TLS 1.3?”
Pre-deployment TLS compliance check
“Before we go live, can you confirm that staging.myapp.io is negotiating TLS 1.3 on port 443, not the older TLS 1.2?”
Monitoring third-party API security posture
“Check what TLS protocol version https://api.thirdparty.io is using — our compliance team needs to know if it's still on TLS 1.2.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/tls-protocol?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent needs to programmatically determine the negotiated TLS protocol version for a given domain or URL, particularly for security audits, compliance checks, or monitoring vendor/third-party API endpoints. Prefer the free sandbox alternative (/v1/sandbox/tls-protocol) first; use this paid endpoint when the sandbox is unavailable or rate-limited.
Side effects
- Host unreachable or DNS resolution failure — endpoint cannot probe the target
- Non-443 port or non-HTTPS URL may not be supported
- SSRF-safe restrictions may block internal/private IP ranges
- Connection timeout if the remote host is slow to respond
- Invalid or malformed host/URL input returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public URL whose hostname is inspected. Provide url or host. Private targets are rejected. |
| host | string | Public hostname such as example.com. The port and check are fixed by the SKU. Provide host or url. |
Tags
x402
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