---
title: "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."
method: POST
path: "/fiber/v1/validate-email/single"
tags: ["Fiber AI"]
---

# 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.

`POST /fiber/v1/validate-email/single`

## Response `200`

Successful response

## Other responses

- `402` — Payment Required (x402 / MPP / np)

## Changes

- **2026-08-25** `806e279c8d50` — 2 info
  - api tag `Fiber AI` added
  - api tag `Fiber AI API` removed

[Change history](https://skmtc.dev/orthogonal/apis/orthogonal-api-marketplace/changes/fiber/v1/validate-email/single/post.md)

---

[API](https://skmtc.dev/orthogonal/apis/orthogonal-api-marketplace.md) · [All operations](https://skmtc.dev/orthogonal/apis/orthogonal-api-marketplace/llms.txt) · [OpenAPI document](https://skmtc.dev/orthogonal/apis/orthogonal-api-marketplace/revisions/4d5d2c85d24e?raw)