# Waterfall.io, contact us: Email validation API

> Verify an email address and get deliverability status in a single synchronous call.

Waterfall.io's email validation API on its Rates are quoted against your data plan.

- This page: https://datacircle.dev/validate-email-apis/waterfall-io/contact-us
- Get it: https://www.waterfall.io/pricing
- Its API docs: https://docs.waterfall.io/v1/email-verifier
- Sold by: Waterfall.io (https://www.waterfall.io)
- Checked: 2026-10-17

## Price

- Billing: contact

## Charges

- Per: call

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Verify an email address and get deliverability status in a single synchronous call.

## Data

- Freshness: live
- Keep data: set by your agreement with Waterfall, not public
- Use data: for internal sales and marketing use or, with our permission, for integration into their products

## Rate limit

- Per second: 0.83
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: email, custom_fields
- Method: POST
- Path: /v1/verify/email

## About the plan

- Plan: Rates are quoted against your data
- Who can get it: business users 18 or over, who sign after a call

## The 20 fields in the plan's answer

job status, start date, stop date, input, job ID, context ID, custom fields, email, domain, email status, SMTP provider, MX record, usage total USD, usage balance remaining USD, usage persons count, usage persons USD, usage phones count, usage phones USD, usage companies count, usage companies USD

## Waterfall.io's plans (1)

- [Waterfall.io, contact us](https://datacircle.dev/validate-email-apis/waterfall-io/contact-us/llms.txt): live

## Waterfall.io's calls (1)

- `POST /v1/verify/email`: [Waterfall.io, contact us](https://datacircle.dev/validate-email-apis/waterfall-io/contact-us/llms.txt)

## Similar plans of other providers

- [Anymail Finder, contact us](https://datacircle.dev/validate-email-apis/anymail-finder/contact-us/llms.txt): live
- [Clearout, contact us](https://datacircle.dev/validate-email-apis/clearout/contact-us/llms.txt): live
- [Dropcontact, contact us](https://datacircle.dev/validate-email-apis/dropcontact/contact-us/llms.txt): live
- [EmailVerify.io, contact us, Custom plan, POST /validate-batch](https://datacircle.dev/validate-email-apis/emailverify-io/contact-us-custom-plan-post-validate-batch/llms.txt): live

## Sources

From each provider's own pricing page and docs. We read this row from these pages on 2026-10-17.

- https://docs.waterfall.io/v1/email-verifier
- https://docs.waterfall.io/v1/inline-usage
- https://docs.waterfall.io/v1/introduction
- https://github.com/Waterfall-io/api-skills/blob/master/skills/waterfall-direct-api/SKILL.md
- https://waterfall-io-public.s3.us-east-1.amazonaws.com/api_specs.yaml
- https://www.waterfall.io/
- https://www.waterfall.io/book-a-call
- https://www.waterfall.io/pricing
- https://www.waterfall.io/privacy-policy
- https://www.waterfall.io/product/contact-enrich
- https://www.waterfall.io/terms-of-service