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Delx Commerce — DNS SPF Lookup Budget Checker
x402
Delx Commerce — DNS SPF Lookup Budget Checker is a paid API for AI agents from commerce.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-28).
Parses a DNS SPF record string and checks whether the number of DNS-lookup-triggering mechanisms stays within a configurable budget limit
Price / call$0.001
Success—
StatusUnknown
How this service works
Pay-per-result APIs for agents. No signup. Exact price. Verifiable delivery. USDC on Base + Solana via x402.
Output
Returns a JSON object containing the total count of DNS-lookup-triggering mechanisms (dns_lookup_terms), a list of all parsed mechanisms, the terminal mechanism (e.g. -all), a boolean indicating whether the record is within the specified maximum budget, the maximum value used, a SHA-256 hash of the input for auditability, and a status field ('pass'). No input data is retained.
Example use cases
Diagnosing SPF PermError before deployment
“I'm about to update my domain's SPF record to 'v=spf1 include:sendgrid.net include:mailchimp.com include:googlemail.com include:smtp.zendesk.com mx a -all' — can you check if it exceeds the 10 DNS lookup limit before I publish it?”
Automated email config audit pipeline
“As part of our email deliverability audit, check this SPF record against a maximum of 10 lookups: 'v=spf1 include:spf.protection.outlook.com include:mail.zendesk.com include:servers.mcsv.net ip4:203.0.113.5 ~all'”
Debugging permerror on a tight SPF budget
“Our SPF record keeps causing permerrors — can you parse 'v=spf1 include:a.example include:b.example include:c.example include:d.example include:e.example include:f.example include:g.example ~all' and tell me how many lookup mechanisms it has against a budget of 8?”
Technical details
Endpoint
POSThttps://commerce.delx.ai/api/v1/x402/dns-spf-lookup-budget?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, privacy-preserving, pay-per-call check of whether an SPF record's DNS-lookup mechanism count is within a configurable budget — especially in automated pipelines (CI/CD, domain audits, email deliverability bots) where no persistent account or signup is desired. It is purpose-built for the RFC 7208 10-lookup limit problem, returns a verifiable SHA-256 of the input, and processes data in-memory without retention. Prefer it over general DNS query APIs when you specifically need mechanism counting and budget validation rather than raw DNS resolution.
Side effects
- Missing or empty 'record' field returns an error or undefined behavior
- Malformed SPF record string may produce incomplete mechanism parsing
- Maximum value of 0 or negative integer may cause unexpected budget comparison
- Record exceeding 8192 character limit will be rejected
- Non-SPF DNS record strings passed as input may yield misleading counts
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| record | string | Record supplied to DNS SPF Lookup Budget; used only for this bounded calculation and processed in memory without retention. |
| maximum | integer | Maximum supplied to DNS SPF Lookup Budget; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"maximum": 10,
"terminal": "-all",
"mechanisms": [
"include:a.example",
"include:b.example",
"mx",
"-all"
],
"within_budget": true,
"dns_lookup_terms": 3
},
"schema": "delx/util-dns-spf-lookup-budget/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "59ce243626eaef239d274d03667e46eee898bb4ca5ecebb645c2679c97cdc137",
"external_calls": 0
},
"operation": "web_reliability:dns_spf_lookup_budget"
}
}Tags
x402
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