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AgentTools Email Validator
x402
AgentTools Email Validator is a paid API for AI agents from agentstoolshub.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-12).
Validates an email address through two layers: RFC-style syntax checking plus a live DNS MX lookup to confirm the domain actually hosts mail servers.
Price / call$0.002
Success—
StatusUnknown
How this service works
Validate an email address in two layers: strict RFC-style syntax, then a live DNS MX lookup on the domain to confirm the recipient actually runs mail servers. Catches the typos and fake domains that pure regex misses. Use this when an agent needs to syntax + live MX check — can this address receive mail?.
Output
Returns a validation result indicating whether the email address passes RFC-style syntax rules and whether the domain has valid MX DNS records, allowing the agent to determine if the address is both well-formed and capable of receiving mail. Exposes which layer failed when invalid.
Example use cases
User registration email check
“Before I create this account, can you verify that the email address sarah.jones@gmial.com is properly formatted and that the domain actually has mail servers? I want to catch any typos before saving it.”
Lead list deliverability audit
“I have this email from a new lead — contact@startupxyz.io — can you check if it's a real, deliverable address? I want to confirm the domain actually runs mail servers before I reach out.”
Form submission fraud detection
“Someone just submitted our signup form with the email test@totallyfakedomain12345.net — can you validate whether that address is real and whether the domain has any mail infrastructure?”
Technical details
Endpoint
GEThttps://agentstoolshub.com/api/v1/dev/email-validator?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need both syntax validation AND live DNS MX verification in a single call — it goes beyond pure regex by confirming the domain actually runs mail infrastructure. Prefer this over client-side regex validation when data quality matters, such as before storing user emails, sending outreach, or onboarding users. Less appropriate if you need full SMTP handshake verification or mailbox existence checks beyond the domain level.
Side effects
- Malformed or missing email query parameter returns an error
- Domain exists but temporarily has DNS lookup failures — may falsely fail MX check
- Catch-all or wildcard MX records may cause false positives for non-existent mailboxes
- DNS timeout on slow or unreachable nameservers
- Disposable email domains with valid MX records pass validation despite being throwaway addresses
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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