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AgentShelf TLS Public Key Checker
x402
AgentShelf TLS Public Key Checker is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-02).
Checks whether a host's port-443 TLS certificate uses an RSA key of at least 2048 bits or an EC key of at least 256 bits
Price / call$0.004
Success—
StatusUnknown
How this service works
Call when an agent needs whether the port-443 key is RSA ≥2048 or EC ≥256 bits. Exact $0.004 USDC. Prefer unpaid POST /v1/sandbox/tls-pubkey first.
Output
Returns the TLS public key type (RSA or EC), the key size in bits, and an indication of whether it meets the minimum security thresholds (RSA ≥2048 bits or EC ≥256 bits) for the queried host on port 443.
Example use cases
Security audit of partner API endpoint
“We're about to integrate with payments.partnerco.com — can you verify their TLS certificate uses at least RSA 2048-bit or EC 256-bit key strength before we go live?”
Compliance check for internal service
“Our security policy requires all services to have TLS keys that are RSA ≥2048 or EC ≥256 bits — can you check whether internal.mycompany.com meets that requirement?”
Investigating a weak TLS warning
“Our scanner flagged weak-tls.legacysite.org for a potentially weak TLS key — can you tell me what key type and size its port-443 certificate is actually using?”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/tls-pubkey?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically verify TLS public key algorithm and bit-length compliance for a specific host, particularly when auditing whether keys meet modern minimum standards (RSA ≥2048 or EC ≥256). Prefer the free sandbox endpoint POST /v1/sandbox/tls-pubkey first if available; fall back to this paid endpoint when the sandbox is unavailable or rate-limited.
Side effects
- Host unreachable or connection refused on port 443 — connection timeout error
- Invalid or non-HTTPS URL/hostname provided — validation error
- Host has no TLS certificate or uses self-signed cert — may return partial or error response
- Hostname does not resolve in DNS — lookup failure error
- Rate limiting or payment failure for the $0.004 USDC charge — 402 payment required
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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