# ContactLint, free: Phone validation API

> ContactLint checks phone numbers over a simple HTTP API. You send a number and a country. You get back whether the number is valid, whether it is possible, its line type and region where the metadata supports them, and the number in E.164, national, and international formats.

ContactLint's phone validation API on its Free plan. It costs $0.00 per 1,000 phones. It returns 5 of the 9 key fields we check: Number, Formats, Validity, Type, Place.
We rank 614 plans by price. [Botoi's $199 monthly plan](https://datacircle.dev/validate-phone-apis/botoi/199-monthly/llms.txt) is the cheapest paid plan per 1,000 phones: as little as $0.0066. Botoi's $199 monthly plan covers up to 1,000,000 phones a day.
[Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt), [Abstract API](https://datacircle.dev/validate-phone-apis/abstract-api/19-monthly-starter-5000-requests-month/llms.txt) and [Listar](https://datacircle.dev/validate-phone-apis/listar/top-up-from-10-starter-post-search-verify-whatsapp/llms.txt) are the best phone validation API providers in our benchmark.

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

## In the answer

- Completeness: 56%
- Number: ✓
- Formats: ✓
- Validity: ✓
- Type: ✓
- Place: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Validate one email · Validate up to 50 emails in one request

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: ContactLint checks phone numbers over a simple HTTP API. You send a number and a country. You get back whether the number is valid, whether it is possible, its line type and region where the metadata supports them, and the number in E.164, national, and international formats.

## Data

- Freshness: stored
- What it checks: numbering plan
- Keep data: no limit
- Use data: You own the data you send us and the results we return to you. [...] You agree not to: Use the Service to build lists for spam, or to check addresses or numbers you have no lawful reason to process. Try to get around rate limits, free-tier limits or signup limits (for example by creating many keys). Probe, overload or attack the Service, or resell raw access to the API without our written OK. Send data you are not allowed to share, such as sensitive data unrelated to contact validation. You are responsible for complying with laws that apply to you, including anti-spam, telemarketing, and data protection laws, when you use the results.

## Plan

- Pay: $0
- You get: 100 credits a month
- Enough for: 100 calls a month
- Expires: unused free checks do not roll over

## Rate limit

- Per second: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: phone. Optional: country
- Method: POST
- Path: /v1/phone/validate

## About the plan

- Plan: Free
- Who can get it: anyone with a non-disposable email address

## The 14 fields the plan's answer can hold

phone number, parsed, valid, possible, line type, region, country calling code, E.164 number, national format, international format, billed as, free checks used this month, free check limit, credits remaining

## ContactLint's plans (4)

- [ContactLint, free](https://datacircle.dev/validate-phone-apis/contactlint/free/llms.txt): $0.00 per 1,000, 56% complete, stored
- [ContactLint, $9 pack](https://datacircle.dev/validate-phone-apis/contactlint/9-pack/llms.txt): $1.80 per 1,000, 56% complete, stored
- [ContactLint, $35 pack](https://datacircle.dev/validate-phone-apis/contactlint/35-pack/llms.txt): $1.40 per 1,000, 56% complete, stored
- [ContactLint, $99 pack](https://datacircle.dev/validate-phone-apis/contactlint/99-pack/llms.txt): $0.99 per 1,000, 56% complete, stored

## ContactLint's calls for this API (1)

- `POST /v1/phone/validate`: [ContactLint, free](https://datacircle.dev/validate-phone-apis/contactlint/free/llms.txt)

## ContactLint's APIs (2)

- [ContactLint: phone validation API pricing, 4 plans](https://datacircle.dev/validate-phone-apis/contactlint/free/llms.txt)
- [ContactLint: email verification API pricing, 4 plans, POST /v1/email/validate](https://datacircle.dev/validate-email-apis/contactlint/free-post-v1-email-validate/llms.txt)
- [ContactLint: email verification API pricing, 4 plans, POST /v1/email/validate/batch](https://datacircle.dev/validate-email-apis/contactlint/free-post-v1-email-validate-batch/llms.txt)

## ContactLint: phone validation API alternatives

- [BigDataCloud, $9.95 monthly, Bronze, GET /data/phone-number-validate](https://datacircle.dev/validate-phone-apis/bigdatacloud/9-95-monthly-bronze-get-data-phone-number-validate/llms.txt): $0.995 per 1,000, 56% complete, stored
- [NumLookupAPI, $49.99 monthly, Pro, POST /v1/validate](https://datacircle.dev/validate-phone-apis/numlookupapi/49-99-monthly-pro-post-v1-validate/llms.txt): $0.9998 per 1,000, 67% complete, stored
- [APIVerve, $99.99 monthly](https://datacircle.dev/validate-phone-apis/apiverve/99-99-monthly/llms.txt): $0.9999 per 1,000, 78% complete, stored
- [CallerAPI, $12,000 monthly, Enterprise transparency $12,000, GET /api/lookup/{phone}](https://datacircle.dev/validate-phone-apis/callerapi/12000-monthly-enterprise-transparency-12000-get-api-lookup-phone/llms.txt): $1.00 per 1,000, 78% complete, stored

## 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://contactlint.com
- https://contactlint.com/docs
- https://contactlint.com/email-validation-api-pricing
- https://contactlint.com/openapi.json
- https://contactlint.com/phone-number-validation-api
- https://contactlint.com/privacy
- https://contactlint.com/terms