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Email MX Readiness Check
x402
Email MX Readiness Check is a paid API for AI agents from api.delx.ai, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-20).
Validates caller-supplied MX records to determine if they contain usable, non-null mail exchanges, returning a deterministic pass/advisory verdict as structured JSON.
Price / call$0.001
Success—
StatusUnknown
How this service works
Email MX Readiness Check: Email MX Readiness Check checks caller-supplied MX records for usable non-null exchanges from bounded caller-supplied values without an external provider. Call Email MX Readiness 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 Email MX Readiness Check as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-part…
Output
Returns versioned deterministic JSON containing: normalized evidence derived from the supplied MX records, a computed finding indicating whether usable non-null exchanges were found, and an explicit pass or advisory status verdict. No external DNS lookups are performed; all processing is in-memory using only the caller-supplied records.
Example use cases
Pre-registration email domain check
“Before we register this new user with the email domain 'example.com', can you validate these MX records I pulled to make sure they actually have working mail exchanges and aren't null or broken?”
Email delivery preflight for outbound campaign
“I'm about to queue a batch of outbound emails — can you run these MX records through the readiness check so I know which domains are actually reachable and which ones should be flagged as advisory?”
Webhook intake MX validation
“We just received a web response with these MX records attached — can you check them for usable exchanges and tell me whether they pass or get an advisory status before I cache the result?”
Technical details
Endpoint
POSThttps://api.delx.ai/api/v1/x402/email-mx-readiness-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, deterministic, self-contained MX record readiness check with no external DNS dependency — ideal for validating caller-supplied MX data in-memory before accepting, caching, redirecting, or retrying a response. Prefer it over live DNS lookup tools when you already have the MX records in hand and want a bounded, reproducible verdict with explicit pass/advisory output.
Side effects
- Malformed or empty records array returns an error or advisory status
- Records exceeding 256 items or objects exceeding 128 properties may be rejected
- Null or missing exchange fields in all records trigger an advisory (non-pass) verdict
- Payment failure via x402 protocol prevents the call from completing
- Invalid JSON structure in the records array causes a processing error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| records | array | Records supplied to Email MX Readiness Check; used only for this bounded calculation and processed in memory without retention. |
Output
Schema · Response
{
"type": "json",
"example": {
"result": {
"ready": true,
"usable_records": [
{
"exchange": "mx.example.com",
"priority": 10
}
]
},
"schema": "delx/util-email-mx-readiness-check/v1",
"status": "pass",
"evidence": {
"retained": false,
"input_sha256": "2f2f55bbb9bea419341f4467faeb92d47276b73be2a24e15557a35a2e9286b7e",
"external_calls": 0
},
"operation": "web_reliability:email_mx_readiness_check"
}
}Tags
x402
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