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DNS CNAME Chain Check
x402
DNS CNAME Chain Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Validates a caller-supplied DNS CNAME chain for loops and hop-count budget violations, returning a deterministic pass/advisory verdict without any external DNS lookups.
Price / call$0.001
Success—
StatusUnknown
How this service works
DNS Cname Chain Check: DNS Cname Chain Check checks a caller-supplied CNAME chain for loops and hop budget from bounded caller-supplied values without an external provider. Call DNS Cname Chain 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 DNS Cname Chain Check as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless,…
Output
Returns versioned deterministic JSON containing normalized web evidence about the chain, the computed finding (e.g. detected loop or hop count exceeded), and an explicit pass or advisory status indicating whether the chain is safe to use.
Example use cases
Pre-cache CNAME loop guard
“Before I cache this DNS response, check this CNAME chain ['shop.mysite.com', 'proxy.cdn.io', 'edge.proxy.net'] for any loops, using a max hop budget of 4.”
Redirect safety preflight
“I'm about to follow a redirect from a domain with this CNAME chain: ['api.service.com', 'routing.service.com', 'backend.cluster.net']. Can you verify there's no loop and it stays within 3 hops?”
Ingress DNS chain audit
“We just received a new web response and need to validate the CNAME chain ['app.company.com', 'app.cdn.com', 'delivery.cdn.com', 'origin.delivery.io'] — check it for cycles and confirm it fits within a 6-hop budget.”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/dns-cname-chain-checkWhen to prefer
Choose this endpoint when you need a stateless, deterministic, first-party check of a CNAME chain without issuing live DNS queries or relying on an external resolver. Ideal as a preflight before caching, redirecting, or retrying any caller-supplied DNS chain where loop safety and hop budgets must be verified offline against bounded inputs.
Side effects
- Chain array exceeds 256 items — request rejected
- Individual name strings longer than 8192 characters — rejected
- Malformed JSON input — 400 error
- max_hops not provided or non-integer — validation error
- Payment not included or insufficient — x402 payment required response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| names | array | Names supplied to DNS Cname Chain Check; used only for this bounded calculation and processed in memory without retention. |
| max_hops | integer | Max Hops supplied to DNS Cname Chain Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"hops": 2,
"loop": false,
"names": [
"www.example.com",
"edge.example.net",
"origin.example.net"
],
"within_budget": true
},
"schema": "delx/util-dns-cname-chain-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "5413dc5bf3dab733024514776f9526adadb0c9c3253d4fd4df6f85ea895c49ef",
"external_calls": 0
},
"operation": "web_reliability:dns_cname_chain_check"
}
}Tags
x402
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