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DNS SOA Serial Compare
x402
DNS SOA Serial Compare 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).
Compares two DNS SOA serial numbers using RFC 1982 32-bit wraparound ordering to determine which is newer or equal
Price / call$0.001
Success—
StatusUnknown
How this service works
DNS SOA Serial Compare: DNS SOA Serial Compare compares SOA serials with 32-bit wraparound ordering from bounded caller-supplied values without an external provider. Call DNS SOA Serial Compare 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 SOA Serial Compare as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless, memor…
Output
Returns a versioned deterministic JSON object containing: normalized evidence of the two input serials, the computed comparison finding (whether candidate is newer, equal, or older than current under RFC 1982 32-bit modular arithmetic), and an explicit pass or advisory status indicating whether the candidate serial should be accepted.
Example use cases
Zone transfer freshness validation
“I have a current SOA serial of 2023091500 and my secondary DNS just reported a candidate serial of 2023091501 — is the candidate actually newer, or could this be a wraparound artifact?”
DNS failover serial sanity check
“Before I accept this DNS failover response, can you compare the current SOA serial 4294967290 against candidate serial 5 and tell me if candidate is considered newer given 32-bit wraparound?”
Caching layer DNS cache invalidation
“My cache has SOA serial 2024030101 and I just got a response with serial 2024030102 — does the candidate serial indicate I should invalidate the cache and refresh?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/dns-soa-serial-compareWhen to prefer
Use this endpoint when you need a stateless, deterministic, RFC 1982-compliant comparison of DNS SOA serials that correctly handles 32-bit wraparound — particularly when current or candidate serials are near the 2^32 boundary where naive integer comparison would give wrong results. Prefer over custom code when you need an auditable, versioned, pay-per-use computation with no server-side state retention.
Side effects
- Missing or invalid integer inputs return an error response
- Values outside 32-bit unsigned integer range may produce unexpected results
- Ambiguous zone (difference exactly 2^31) returns advisory rather than definitive result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| current | integer | Current supplied to DNS SOA Serial Compare; used only for this bounded calculation and processed in memory without retention. |
| candidate | integer | Candidate supplied to DNS SOA Serial Compare; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"current": 2026080901,
"candidate": 2026080902,
"delta_mod_32": 1,
"candidate_newer": true
},
"schema": "delx/util-dns-soa-serial-compare/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "9febd53cb6501e9bcda3f0c607a1384a0ce164c890676f9d5051bc3424e22c53",
"external_calls": 0
},
"operation": "web_reliability:dns_soa_serial_compare"
}
}Tags
x402
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