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SYNTHORA DNS HTTPS/SVCB Record Resolver (DoH)
x402
SYNTHORA DNS HTTPS/SVCB Record Resolver (DoH) is a paid API for AI agents from doh-https-svcb-record.hergertsynthora.com, paid per call via x402, $0.0015/call, status unknown (last checked 2026-09-13).
Resolves HTTPS/SVCB DNS records (type 65) for a domain via Google DoH JSON, returning ALPN protocols, IPv4/IPv6 hints, and ECH config
Price / call$0.0015
Success—
StatusUnknown
How this service works
Returns HTTPS (type 65 / SVCB) records exposing ALPN protocols (h3, h2), IPv4/IPv6 hints and ECH config for a host via Google DoH JSON. A2A use: connection-optimizing and TLS-fingerprinting agents detect HTTP/3 support and encrypted-client-hello readiness before dialing. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.
Output
Returns a JSON object with ok:true, the queried domain, an array of HTTPS/SVCB DNS records each containing TTL, record name, type (65), and a value string showing priority, ALPN protocols (e.g. h3,h2), IPv4 hints, IPv6 hints, and ECH config, plus provenance metadata pointing to Google DoH.
Example use cases
HTTP/3 support detection before dialing
“Before my agent connects to api.example.com, check its HTTPS DNS records to see if it advertises h3 or h2 ALPN support and what IP hints it provides.”
ECH readiness audit for a domain
“I want to know if stripe.com has Encrypted Client Hello configured — can you pull its SVCB/HTTPS DNS record and check for an ECH config?”
Connection optimization for a CDN endpoint
“Query the HTTPS DNS records for cdn.shopify.com and give me the full ALPN protocol list and IPv4/IPv6 hints so I can optimize how my client dials it.”
Technical details
Endpoint
POSThttps://doh-https-svcb-record.hergertsynthora.com/serviceWhen to prefer
Use this endpoint when an agent needs to determine HTTP/3 (QUIC) or ECH support for a domain before establishing a connection, or when building connection-optimizing logic that reads ALPN and IP hint data from DNS. Prefer this over generic DNS resolvers when you specifically need type-65 HTTPS/SVCB records rather than A, AAAA, or MX records. It is ideal for TLS fingerprinting, pre-connection protocol negotiation, and infrastructure analysis workflows.
Side effects
- Domain does not have HTTPS/SVCB records — returns empty records array
- Invalid or malformed domain name causes query failure
- Upstream Google DoH service is unreachable or rate-limits the request
- Non-existent domain returns NXDOMAIN with no records
- Network timeout from the resolver service
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | domain |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"niche": "doh-https-svcb-record",
"result": {
"domain": "cloudflare.com",
"records": [
{
"ttl": 300,
"name": "cloudflare.com.",
"type": 65,
"value": "1 . alpn=h3,h2 ipv4hint=104.16.132.229,104.16.133.229 ipv6hint=2606:4700::6810:84e5,2606:4700::6810:85e5"
}
]
},
"provenance": {
"url": "https://dns.google/resolve",
"source": "DNS HTTPS/SVCB Record Resolver (DoH)"
}
}
}Tags
x402
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