# OpenLookup, free: Phone validation API

> Phone syntax, country, and line-type classification.

OpenLookup's phone validation API on its Free plan. It costs $0.00 per 1,000 phones. It returns 4 of the 9 key fields we check: Number, Validity, Type, Place.
In [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt), the best plan from OpenLookup scores 0.0 out of 100. OpenLookup ranks 34th of 40 providers.
This plan is free. We rank 888 plans for phone validation APIs by price. Half the plans cost $3.376 per 1,000 phones or less.
[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), [Foxentry](https://datacircle.dev/validate-phone-apis/foxentry/top-up-pay-as-you-go-post-phone-validate-validate-phone-number-extended/llms.txt) and [HLR Lookups](https://datacircle.dev/validate-phone-apis/hlr-lookups/top-up-1-1m-post-hlr-lookup/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/openlookup/free
- [Phone validation API: 40+ providers compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://openlookup.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `POST https://openlookup.io/api/v1/phone/check`
- API key: with the plan, on https://openlookup.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://openlookup.io/docs/phone?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Sold by: OpenLookup (https://openlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-02

## In the answer

- Completeness: 44%
- Number: ✓
- 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: Email Check · IP Check · Domain Check · IBAN Check · BIC Check · VAT Check · LEI Check · Card BIN Check · ISIN Check · Routing Number Check · Crypto Address Check · ASN Check · Security Headers Check · DNSSEC Check · CAA Check · TLS Check · Typosquat Check · Website Status Check · IPv6 Readiness Check · URL Safety Check · Batch check

## Overage

- Units cap: hard

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Phone syntax, country, and line-type classification.

## Data

- Freshness: stored
- What it checks: numbering plan
- Keep data: no limit
- Use data: You may not use OpenLookup to facilitate spam or robocalling, to launder or clean contact lists obtained without the consent of the people on them, or for any unlawful purpose. [...] The following uses are prohibited: Cleaning or validating email or phone number lists that were purchased, scraped, or otherwise obtained without the consent of the people on them, Preparing, testing, or supporting unsolicited bulk email (spam) or unsolicited robocall/ text campaigns, Attempting to enumerate, harvest, or reverse-engineer valid email addresses or phone numbers using the API's signals, Scanning or probing IP ranges or domains you do not own or operate for purposes beyond the risk-assessment use case the API is provided for, Reselling or rebranding API access without a written agreement with us, Any use that violates applicable law, including data protection law in your or your users' jurisdiction, Attempting to circumvent rate limits, credit limits, or authentication controls

## Plan

- Pay: $0
- You get: 100 requests a month
- Enough for: 100 calls a month

## Rate limit

- Per second: 0.17
- Batch: 1

## Speed

- Answer: in the call

## The call

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

## About the plan

- Plan: Free
- Who can get it: anyone

## The 12 fields the plan's answer can hold

phone number, risk score, classification, recommendation, syntax valid, possible number, country code, line type, reachable, degraded, response time, credits remaining

## OpenLookup's plans (4)

- [OpenLookup, free](https://datacircle.dev/validate-phone-apis/openlookup/free/llms.txt): $0.00 per 1,000, 44% complete, stored
- [OpenLookup, $9 monthly](https://datacircle.dev/validate-phone-apis/openlookup/9-monthly/llms.txt): $1.80 per 1,000, 44% complete, stored
- [OpenLookup, $49 monthly](https://datacircle.dev/validate-phone-apis/openlookup/49-monthly/llms.txt): $0.98 per 1,000, 44% complete, stored
- [OpenLookup, contact us](https://datacircle.dev/validate-phone-apis/openlookup/contact-us/llms.txt): 44% complete, stored

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

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

## OpenLookup's APIs (2)

- [OpenLookup: email verification API pricing, 4 plans](https://datacircle.dev/validate-email-apis/openlookup/free/llms.txt)
- [OpenLookup: phone validation API pricing, 4 plans](https://datacircle.dev/validate-phone-apis/openlookup/free/llms.txt)

## OpenLookup: phone validation API alternatives

- [ContactLint, $99 pack](https://datacircle.dev/validate-phone-apis/contactlint/99-pack/llms.txt): $0.99 per 1,000, 56% complete, stored
- [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, Batch Validation](https://datacircle.dev/validate-phone-apis/numlookupapi/49-99-monthly-pro-post-v1-validate/llms.txt): $0.9998 per 1,000, 67% 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 2026-11-02.

- https://openlookup.io?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://openlookup.io/acceptable-use?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://openlookup.io/docs/email?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://openlookup.io/docs/phone?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://openlookup.io/docs/rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://openlookup.io/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://openlookup.io/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://openlookup.io/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing