# AddressZen, free: Phone validation API

> Validates a phone number and returns its country, its national and international formats, and the network it was originally assigned to.

AddressZen's Free for 30 days plan for the phone validation API costs $0.00 per 1,000 phones. We check each provider's docs for 9 fields. AddressZen's docs list 4: Formats, Validity, Carrier, Place.
We ran AddressZen in [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt). We didn't score AddressZen's call.
This plan is free. We rank 1,340 plans for phone validation APIs by price. Half the plans cost $2.923 or less per 1,000 phones. [298 phone validation API plans on our price sheet are free.](https://datacircle.dev/best-phone-validation-api.txt) [Trestle](https://datacircle.dev/validate-phone-apis/trestle/free/llms.txt) has a free plan with 25 calls in total. Trestle is the best phone validation API in our benchmark.
[Linq's $260 monthly plan](https://datacircle.dev/validate-phone-apis/linq/260-monthly-pro-post-v3-capability-check-imessage/llms.txt) is the cheapest paid plan per 1,000 phones. Linq's phone validation API costs nothing beyond the plan price. [Keyronne's pay-as-you-go plan](https://datacircle.dev/validate-phone-apis/keyronne/pay-as-you-go/llms.txt) costs the least for 10,000 phones a month: $0.20.
[Trestle](https://datacircle.dev/validate-phone-apis/trestle/top-up-from-10-self-serve-pay-as-you-go-get-3-0-phone-intel-phone-validation-api/llms.txt), [Signal House](https://datacircle.dev/validate-phone-apis/signal-house/top-up-from-10/llms.txt) and [Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/addresszen/free
- [Phone validation API in 2026: the best of 70+ compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://addresszen.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `GET https://api.addresszen.com/v1/phone_numbers`
- API key: with the plan, on https://addresszen.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://docs.addresszen.com/docs/api/phone-number-validation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Sold by: AddressZen (https://addresszen.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-11

## In the answer

- Completeness: 44%
- Formats: ✓
- Validity: ✓
- Carrier: ✓
- Place: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: Find Address · from the same budget: Retrieve Address · Verify Address · Resolve Place · Email Validation

## Not found

- $ per 1,000 calls that find nothing: $0.00

## In their words

- Their pitch: Validates a phone number and returns its country, its national and international formats, and the network it was originally assigned to.

## Data

- What it checks: numbering plan
- Keep data: no time limit in its terms, UPU postcode data: "You shall not: [...] Store or cache the data outside permitted systems"
- Use data: "Except to the extent expressly permitted by law or agreed in writing by IDDQD, the Client is prohibited from: re-selling (whether for free or by charging) the Service Output or Service, copying the Software Materials or any part [...], translating adapting, varying, or modifying the Software Materials or Services, disassembling, decompiling or reverse engineering the Software." "The Client may not (except to the extent expressly permitted by law or agreed in writing by IDDQD or in Third Party Contracts): use the Service to provide any software or a service which competes with the Software Materials or Service, undertake any data cleansing activities unless expressly permitted by the respective Third Party Contracts, use the Service, API data, or any content obtained through our platform to develop, train, improve, benchmark, enhance or evaluate any artificial intelligence, machine learning, or automated decision-making systems, whether directly or indirectly." "The Service and Software Materials are provided solely for the Client's own use. The Client may not resell or attempt to resell the Service Output [...] without IDDQD's express written permission." "Lookups are not transferable to third parties, nor may it be used for the benefit of third parties by the Client." "Any test balance disbursed on Your account (including Your initial free balance) may only be used for testing and evaluation purposes." US addresses: "in order to make use of the Service it must enter into a USPS Licence". UPU postcode data: "Usage is restricted to internal address validation, correction, and cleansing purposes only."

## Plan

- Pay: $0
- You get: 100 credits
- Enough for: 100 calls, once
- Expires: 30 days

## Rate limit

- Per second: 30
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: query. Optional: current_carrier, tags
- Method: GET
- Path: /phone_numbers

## About the plan

- Plan: Free for 30 days
- Who can get it: an organisation: the terms' "Client means the organisation named as the 'Client' or 'Business' or 'Company' in the registration form"

## The 10 fields the plan's answer can hold

valid, national format, international format, country ISO code, country ISO-2 code, country, original carrier network code, original carrier name, original carrier country, original carrier network type

## AddressZen's plans (5)

- [AddressZen, free](https://datacircle.dev/validate-phone-apis/addresszen/free/llms.txt): $0.00 per 1,000, 44% complete
- [AddressZen, $49 pack](https://datacircle.dev/validate-phone-apis/addresszen/49-pack/llms.txt): $35.00 per 1,000, 44% complete
- [AddressZen, $149 pack](https://datacircle.dev/validate-phone-apis/addresszen/149-pack/llms.txt): $29.80 per 1,000, 44% complete
- [AddressZen, $349 pack](https://datacircle.dev/validate-phone-apis/addresszen/349-pack/llms.txt): $24.929 per 1,000, 44% complete
- [AddressZen, $1,000 pack](https://datacircle.dev/validate-phone-apis/addresszen/1000-pack/llms.txt): $18.182 per 1,000, 44% complete

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

- `GET /phone_numbers`: [AddressZen, free](https://datacircle.dev/validate-phone-apis/addresszen/free/llms.txt)

## AddressZen's APIs (2)

- [AddressZen Email verification API pricing, 5 plans](https://datacircle.dev/validate-email-apis/addresszen/free/llms.txt)
- [AddressZen Phone validation API pricing, 5 plans](https://datacircle.dev/validate-phone-apis/addresszen/free/llms.txt)

## AddressZen: phone validation API alternatives

[AddressZen alternatives: other phone validation API providers by price](https://datacircle.dev/addresszen-alternatives.txt)

We list AddressZen's cheapest paid plan first. Next we list other providers' plans closest to AddressZen in price per 1,000 phones.

- [AddressZen, $1,000 pack](https://datacircle.dev/validate-phone-apis/addresszen/1000-pack/llms.txt): $18.182 per 1,000, 44% complete
- [Openapi.com, €10,000 yearly](https://datacircle.dev/validate-phone-apis/openapi-com/10000-yearly/llms.txt): $18.005 per 1,000, 78% complete, live
- [HLR Lookup, £680 pack, 200,000 lookups, POST /apiv2/hlr, Full HLR lookup, full](https://datacircle.dev/validate-phone-apis/hlr-lookup/680-pack-200000-lookups-post-apiv2-hlr-full-hlr-lookup-full/llms.txt): $18.136 per 1,000, 89% complete, live
- [SMSC.ru, top-up from ₽5,000, Tariff plan 4, Russia, all operators](https://datacircle.dev/validate-phone-apis/smsc-ru/top-up-from-5000-tariff-plan-4-russia-all-operators/llms.txt): $18.147 per 1,000, 56% complete, live
- [SMSC.kz, top-up from ₸5,000, Tariff plan 2, Russia, all operators](https://datacircle.dev/validate-phone-apis/smsc-kz/top-up-from-5000-tariff-plan-2-russia-all-operators/llms.txt): $18.276 per 1,000, 56% 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 2026-11-11.

- https://addresszen.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://addresszen.com/guides/what-is-a-lookup?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://addresszen.com/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.addresszen.com/docs/api?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.addresszen.com/docs/api/api-reference?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.addresszen.com/docs/api/phone-number-validation?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.addresszen.com/docs/cli/phone.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.addresszen.com/docs/sdks/python/endpoints/phone-number-validation.md?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://openapi.addresszen.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://terms.addresszen.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://terms.addresszen.com/extended-terms-of-service/payg-lookup-licence?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://terms.addresszen.com/third-party-licences/UPU?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://terms.addresszen.com/third-party-licences/usps?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing