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DNS Lookup & Mail Security API
x402
DNS Lookup & Mail Security API is a paid API for AI agents from freetier-agent-api.pages.dev, paid per call via x402, $0.0025/call, status unknown (last checked 2026-10-30).
Looks up DNS records (A, AAAA, MX, NS, TXT, CNAME, CAA) for any domain and optionally checks SPF/DMARC email security configuration.
Price / call$0.0025
Success—
StatusUnknown
How this service works
Invoice-to-JSON, on-chain tools (transaction explainer + payment check, wallet profile, contract ABI, ERC-20 token risk), company contacts and web-to-RAG for AI agents. Pay per call with x402 (USDC on Base). No signup, no API key.
Output
Returns a JSON object containing the domain name, existence flag, DNS status code, resolver name, DNSSEC validation boolean, timestamp, a records object keyed by type (A, AAAA, MX, NS, TXT, CNAME, CAA) each with TTL and data, resolver sources with attribution, and optionally a mail object with SPF record text, DMARC policy, SPF all-qualifier, MX host list, warnings array, DMARC percentage, DMARC reporting URI, mail acceptance boolean, and multi-SPF detection flag.
Example use cases
Email deliverability pre-flight check
“Before I send a marketing campaign from acme.io, can you check whether that domain has valid SPF and DMARC records set up, and tell me what MX hosts are accepting mail for it?”
Domain existence and IP verification
“Can you confirm that newstartup.xyz actually exists and resolves to a real IP address — show me the A and AAAA records?”
Certificate authority pinning audit
“What CAA records does shopify.com have? I want to know which certificate authorities are allowed to issue TLS certs for that domain.”
Technical details
Endpoint
GEThttps://freetier-agent-api.pages.dev/api/dns?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need real-time DNS resolution with structured JSON output and optional integrated mail security analysis (SPF/DMARC) in a single call. It is ideal for AI agents that need to verify domain infrastructure, check email deliverability configuration, or enrich contact/company data with DNS signals — without managing DNS resolver infrastructure. The pay-per-call x402 model (no signup or API key) makes it suitable for automated agent pipelines.
Side effects
- Domain does not exist — returns exists: false with NXDOMAIN status
- Invalid or malformed domain input — may return error or empty records
- Requested record type not found — returns null or empty array for that type
- DNSSEC validation failure — dnssec_validated returns false
- Upstream DNS resolver unavailable — service error response
- Exceeding 10 record types in the types parameter — request rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"mail": {
"spf": "v=spf1 ip4:192.30.252.0/22 include:spf.protection.outlook.com include:_netblocks.google.com include:_netblocks2.google.com include:mail.zendesk.com include:_...",
"dmarc": "v=DMARC1; p=quarantine; sp=reject; pct=100; rua=mailto:dmarc@github.com; ruf=mailto:dmarc@github.com; fo=1",
"spf_all": "~all",
"mx_hosts": [
"github-com.mail.protection.outlook.com"
],
"warnings": [],
"dmarc_pct": 100,
"dmarc_rua": "mailto:dmarc@github.com",
"accepts_mail": true,
"dmarc_policy": "quarantine",
"spf_multiple": false
},
"domain": "github.com",
"exists": true,
"status": "NOERROR",
"records": {
"A": [
{
"ttl": 26,
"data": "140.82.114.3"
}
],
"MX": [
{
"ttl": 259,
"data": "0 github-com.mail.protection.outlook.com.",
"host": "github-com.mail.protection.outlook.com",
"priority": 0
}
],
"NS": [
{
"ttl": 559,
"data": "dns1.p08.nsone.net."
},
{
"ttl": 559,
"data": "dns2.p08.nsone.net."
}
],
"CAA": [
{
"ttl": 1451,
"data": "0 issue \"digicert.com\""
},
{
"ttl": 1451,
"data": "0 issue \"globalsign.com\""
}
],
"TXT": [
{
"ttl": 300,
"data": "00Dd0000000hHE0=1TBKg000000TN2r"
},
{
"ttl": 300,
"data": "MS=6BF03E6AF5CB689E315FB6199603BABF2C88D805"
}
],
"AAAA": [],
"CNAME": []
},
"sources": [
{
"url": "https://developers.cloudflare.com/1.1.1.1/",
"name": "Cloudflare 1.1.1.1 (DNS-over-HTTPS)"
}
],
"resolver": "cloudflare",
"checked_at": "2026-10-25T22:37:38.279Z",
"dnssec_validated": false
}
}Tags
x402
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