# MailRambo, free: Email verification API

> Know if an email will bounce - before you send. One API call. A strict yes/no answer with a reason code. Uncertain mailboxes count as “no”, so bad addresses never reach your sender reputation.

MailRambo's email verification API on its Free plan. It costs $0.00 per 1,000 emails. It returns 3 of the 6 key fields we check: Address, Deliverability, Confidence.
The cheapest of the 1,847 plans we rank by price is [treg, top-up from $10](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt). treg asks one provider after another until one answers. treg costs $0.00 per 1,000 emails on average. You pay $26.95 per 1,000 emails when no provider answers.
[Enrich.so](https://datacircle.dev/validate-email-apis/enrich-so/149-monthly/llms.txt), [GetProspect](https://datacircle.dev/validate-email-apis/getprospect/369-pack/llms.txt) and [treg](https://datacircle.dev/validate-email-apis/treg/top-up-from-10/llms.txt) are the best email verification API providers in our benchmark.

- This page: https://datacircle.dev/validate-email-apis/mailrambo/free
- [Best email verification API in 2026](https://datacircle.dev/best-email-verification-api.txt)
- Get it: https://www.mailrambo.com/pricing
- Request: `POST https://www.mailrambo.com/v1/verify`
- API key: with the plan, on https://www.mailrambo.com/pricing
- Its API docs: https://www.mailrambo.com/developers
- Sold by: MailRambo (https://www.mailrambo.com)
- Checked: 2026-10-27

## In the answer

- Completeness: 50%
- Address: ✓
- Deliverability: ✓
- Confidence: ✓

## Price

- $ per 1,000 emails: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Repeat free: 24 hours
- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## Catch-all

- $ per 1,000: $0.00

## In their words

- Their pitch: Know if an email will bounce - before you send. One API call. A strict yes/no answer with a reason code. Uncertain mailboxes count as “no”, so bad addresses never reach your sender reputation.

## Data

- Freshness: live
- What it checks: format, mail servers, disposable domains, role addresses, mailbox
- Keep data: no limit
- Use data: Only check addresses you have a legitimate reason to check, such as your own signups, customers or contacts. Do not use MailRambo to send spam or unsolicited bulk email, to harvest or guess addresses, to harass anyone, to probe systems you are not authorised to test, to resell the service without our agreement, or to break any law or third-party right.

## Plan

- Pay: $0
- You get: 100 credits a month
- Enough for: 100 calls a month
- Expires: plan credits reset at the start of each cycle

## Rate limit

- Per day: 10
- Per second: 10
- Batch: 1

## Speed

- Answer: in the call
- Median: 5.80 s

## The call

- You send: email. Optional: detail, mode
- Method: POST
- Path: /v1/verify

## About the plan

- Plan: Free
- Who can get it: anyone

## The 22 fields the plan's answer can hold

email, deliverable, reason, credits remaining, cached, mode, suggestion, grade, score, inbox provider, free email, role account, disposable, catch-all, mailbox exists, MX, MX hosts, SPF, DMARC policy, DKIM selectors, BIMI, PTR

## MailRambo's plans (9)

- [MailRambo, free](https://datacircle.dev/validate-email-apis/mailrambo/free/llms.txt): $0.00 per 1,000, 50% complete, live
- [MailRambo, $9 pack](https://datacircle.dev/validate-email-apis/mailrambo/9-pack/llms.txt): $4.50 per 1,000, 50% complete, live
- [MailRambo, $29 pack](https://datacircle.dev/validate-email-apis/mailrambo/29-pack/llms.txt): $2.90 per 1,000, 50% complete, live
- [MailRambo, $119 pack](https://datacircle.dev/validate-email-apis/mailrambo/119-pack/llms.txt): $2.38 per 1,000, 50% complete, live
- [MailRambo, $199 pack](https://datacircle.dev/validate-email-apis/mailrambo/199-pack/llms.txt): $1.99 per 1,000, 50% complete, live
- [MailRambo, $5 monthly, Starter, POST /v1/verify](https://datacircle.dev/validate-email-apis/mailrambo/5-monthly-starter-post-v1-verify/llms.txt): $5.00 per 1,000, 50% complete, live
- [MailRambo, $19 monthly, Basic, POST /v1/verify](https://datacircle.dev/validate-email-apis/mailrambo/19-monthly-basic-post-v1-verify/llms.txt): $3.80 per 1,000, 50% complete, live
- [MailRambo, $49 monthly, Pro, POST /v1/verify](https://datacircle.dev/validate-email-apis/mailrambo/49-monthly-pro-post-v1-verify/llms.txt): $2.45 per 1,000, 50% complete, live
- [MailRambo, $149 monthly, Enterprise, POST /v1/verify](https://datacircle.dev/validate-email-apis/mailrambo/149-monthly-enterprise-post-v1-verify/llms.txt): $1.987 per 1,000, 50% complete, live

## MailRambo's calls (2)

- `POST /v1/verify`: [MailRambo, free](https://datacircle.dev/validate-email-apis/mailrambo/free/llms.txt)
- `POST /v1/verify/batch`: [MailRambo, $5 monthly, Starter, POST /v1/verify/batch](https://datacircle.dev/validate-email-apis/mailrambo/5-monthly-starter-post-v1-verify-batch/llms.txt)

## MailRambo's APIs (1)

- [MailRambo: email verification API pricing, 9 plans](https://datacircle.dev/validate-email-apis/mailrambo/free/llms.txt)

## MailRambo: email verification API alternatives

- [WhoisXML API, $5,940 yearly, Yearly subscription 250,000 Queries, GET /api/v3](https://datacircle.dev/validate-email-apis/whoisxml-api/5940-yearly-yearly-subscription-250000-queries-get-api-v3/llms.txt): $1.98 per 1,000, 50% complete, live
- [Abstract API, $99 monthly](https://datacircle.dev/validate-email-apis/abstract-api/99-monthly/llms.txt): $1.98 per 1,000, 33% complete, live
- [Enrow, $397 monthly](https://datacircle.dev/validate-email-apis/enrow/397-monthly/llms.txt): $1.985 per 1,000, 33% complete, live
- [EmailVerify.io, $199 pack, Pay As You Go, 100,000 Credits, POST /validate-batch](https://datacircle.dev/validate-email-apis/emailverify-io/199-pack-pay-as-you-go-100000-credits-post-validate-batch/llms.txt): $1.99 per 1,000, 33% complete, live

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-27.

- https://www.mailrambo.com/developers
- https://www.mailrambo.com/pricing
- https://www.mailrambo.com/terms
- https://www.mailrambo.com/v1/openapi.json