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HTTP/3 & Modern Transport Protocol Checker
x402
HTTP/3 & Modern Transport Protocol Checker is a paid API for AI agents from intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Checks a domain for HTTP/3 (QUIC), HTTP/2, and Encrypted Client Hello (ECH) support by inspecting DNS HTTPS records (ALPN, ECH, IP hints) and the Alt-Svc response header.
Price / call$0.01
Success—
StatusUnknown
How this service works
HTTP/3 and modern-transport support: checks the DNS HTTPS record (alpn, ech, ipv4hint), the Alt-Svc response header for h3, and reports whether HTTP/3 (QUIC), HTTP/2 and Encrypted Client Hello are advertised. Useful for protocol-compatibility and performance audits. $0.01 per domain.
Output
Returns a structured report indicating whether the domain advertises HTTP/3 (QUIC) and HTTP/2 support, details from the DNS HTTPS record (including ALPN values, ECH parameters, and IPv4 hints), and the Alt-Svc response header contents showing h3 advertisement status.
Example use cases
Pre-migration protocol compatibility audit
“Before we migrate our CDN, can you check if example.com currently advertises HTTP/3 via Alt-Svc and whether its DNS HTTPS record has the right ALPN values?”
Security audit for ECH adoption
“I'm reviewing our infrastructure security posture — can you tell me whether api.mycompany.com has Encrypted Client Hello enabled and advertised in its DNS HTTPS record?”
Competitor performance benchmarking
“I want to benchmark protocol modernity — can you check if shopify.com supports HTTP/3 and QUIC, and what its ALPN and IPv4 hint entries look like?”
Technical details
Endpoint
GEThttps://intel.rallylive.ca/monitor/http3When to prefer
Choose this endpoint when you need to specifically audit HTTP/3 (QUIC) and ECH readiness for a domain, combining both DNS HTTPS record inspection and Alt-Svc header analysis in a single call. Prefer this over generic DNS lookup endpoints when you need protocol-layer and transport-layer details together, especially for performance or security auditing workflows.
Side effects
- Domain does not exist or fails DNS resolution — no results returned
- Domain does not have a DNS HTTPS record — ALPN and ECH fields will be absent or null
- Alt-Svc header not present on the domain's HTTP response — h3 advertisement not detectable
- Network timeout reaching the target domain — error response
- Invalid domain format provided — request rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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