---
title: "Validate email deliverability"
method: POST
path: "/v1/contacts/validate"
tags: ["Contacts"]
---

# Validate email deliverability

`POST /v1/contacts/validate`

Batch deliverability check (up to 100 addresses) — run BEFORE importing or sending. Each address is classified `valid` (safe), `risky` (deliverable but flagged — e.g. role account, disposable, catch-all), or `invalid` (undeliverable / do-not-send), with a machine-readable `reason` and a `didYouMean` typo correction when applicable. Cost: 2 credits PER ADDRESS (`X-Credit-Cost` = 2 × the number of addresses), charged ONLY on success — if the check cannot complete for the whole batch, the call returns a retryable `503` and is NOT billed.

## Request body

- ContactsValidateRequest
  - `emails` string[], required

## Response `200`

One classification row per input address.

- ContactsValidateResponse
  - `data` object[], required
    - `email` string, required
    - `valid` boolean, required
    - `status` 'valid' | 'risky' | 'invalid', required
    - `reason` string
    - `didYouMean` string
    - `risk` string
    - `isDisposable` boolean
    - `isRole` boolean

## Other responses

- `400` — The request body or query string was invalid (unknown key, wrong type, or missing required field). Strict schemas reject unknown keys — including `brandId`, which is always resolved from the API key.
- `401` — The API key was missing, invalid, or revoked.
- `402` — The org's remaining credit balance is below what this operation requires. Credit cost is published PER-OPERATION (see `GET /v1/help`): content/media operations charge a flat cost, while AI generation (email generate/edit/import, image generation) is usage-metered — charged by actual model usage rather than a flat price. `details.cost` carries the amount the runtime required for THIS call. Check your balance up front via `GET /v1/usage`. No `Retry-After` — credits reset at the billing-period boundary.
- `403` — The caller does not have the required `contacts` permission.
- `429` — The request hit the rolling rate limit window.
- `500` — Unexpected internal error.
- `503` — The credit balance could not be verified (a transient billing dependency outage). The gate fails closed rather than do paid work it cannot meter. Retryable — `Retry-After` indicates when.

---

[API](https://skmtc.net/brew/apis/brew-public-api-v1.md) · [All operations](https://skmtc.net/brew/apis/brew-public-api-v1/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/brew/brew-public-api-v1/versions/db96cfedc6c5/schema)