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Orthogonal Email Validation (Bounce Detection)
x402
Orthogonal Email Validation (Bounce Detection) is a paid API for AI agents from x402.orthogonal.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-14).
Checks whether a given email address is likely to bounce, using a waterfall of strategies including catch-all address handling.
Price / call$0.02
Success—
StatusUnknown
How this service works
Checks if a given email is likely to bounce using a waterfall of strategies. Works for catch-all email addresses, which are increasingly common yet hard for other APIs to validate.
Output
Returns a result indicating whether the given email is likely to bounce, including handling for catch-all domains where traditional validation falls short. Typically includes a deliverability verdict or bounce likelihood assessment for the provided address.
Example use cases
Pre-campaign email list scrubbing
“I have a prospect email address, sarah.jones@bigcorp.com — can you check if it's likely to bounce before I add it to my outreach campaign? Their domain might be catch-all.”
New user signup email verification
“A user just signed up with the email mike.smith@startupxyz.io — can you verify whether that address is actually deliverable before we send their welcome email?”
CRM contact data quality check
“I want to make sure the email address we have on file for our lead, linda.wu@globalfirm.com, is valid and won't bounce — can you run a deliverability check on it?”
Technical details
Endpoint
POSThttps://x402.orthogonal.com/fiber/v1/validate-email/singleWhen to prefer
Choose this endpoint when you need to validate email deliverability beyond simple format checking — especially for catch-all domains (e.g. corporate domains that accept all addresses) where standard MX/SMTP checks give false positives. Ideal for pre-send campaign scrubbing, signup validation, or CRM data quality. Prefer over basic regex/format validators when bounce prevention is the primary goal.
Side effects
- Invalid or malformed email address returns an error or low-confidence result
- Network timeouts if upstream mail server checks are slow
- Catch-all domains may return an inconclusive result if waterfall strategies are exhausted
- Payment failure or insufficient USDC balance prevents the call from completing
- Temporary mail server unavailability may reduce accuracy of result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | The email to validate |
Tags
x402
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