# Orthogonal Email Validation (Bounce Detection)

> 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.

## Facts

- Endpoint: POST https://x402.orthogonal.com/fiber/v1/validate-email/single
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/orthogonal-email-validation-bounce-detection-0adea65a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_EamjBHLHd9Z4rOz_Ia51k

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability orthogonal-email-validation-bounce-detection-0adea65a -d '<json body>'
```

Example prompt: Can you check if john.doe@acmecorp.com is likely to bounce before I send them an outreach email? I need to know if it's a real, deliverable address, especially since their domain might be catch-all.

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "email": {
   "type": "string",
   "description": "The email to validate"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/orthogonal-email-validation-bounce-detection-0adea65a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.orthogonal.com](https://www.zero.xyz/host/x402.orthogonal.com/llms.txt)