# AgentPhone, free: Phone validation API

> Look up line-type intelligence for phone numbers. Answers "should my agent text this number" before spending a message: mobile (`lineType: "mobile"`) vs landline vs VoIP, country, and whether the handset supports RCS.

AgentPhone's phone validation API on its Starting credit on signup plan. It costs $0.00 per 1,000 phones. AgentPhone's docs list 3 of the 9 fields on our checklist: Number, Type, Place.
In [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt), the best plan from AgentPhone scores 0.0 out of 100. AgentPhone ranks 19th of 49 providers.
This plan is free. We rank 1,106 plans for phone validation APIs by price. Half the plans cost $2.991 per 1,000 phones or less. [See how many phone validation API plans are free.](https://datacircle.dev/best-phone-validation-api.txt)
[GuGuData's CNY 124 (about $19) monthly plan](https://datacircle.dev/validate-phone-apis/gugudata/cny-124-monthly/llms.txt) is the cheapest paid plan per 1,000 phones. GuGuData's CNY 124 (about $19) monthly plan charges nothing per call. You get as many phones as GuGuData's rate limit allows.
[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), [Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt) and [Abstract API](https://datacircle.dev/validate-phone-apis/abstract-api/19-monthly-starter-5000-requests-month/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/agentphone/free
- [Phone validation API: the best of 40+ providers compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://agentphone.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `GET https://api.agentphone.ai/v1/numbers/lookup`
- API key: with the plan, on https://agentphone.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://docs.agentphone.ai/api-reference/numbers/lookup-numbers-v-1-numbers-lookup-get?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Sold by: AgentPhone (https://agentphone.ai?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-05

## In the answer

- Completeness: 33%
- Number: ✓
- Type: ✓
- Place: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Create Number · Create Outbound Call · Send Message · Send Verification · Check Verification · Register A2P

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Look up line-type intelligence for phone numbers. Answers "should my agent text this number" before spending a message: mobile (`lineType: "mobile"`) vs landline vs VoIP, country, and whether the handset supports RCS.

## Data

- Keep data: no limit
- Use data: We grant you a limited, non-exclusive, non-transferable license to use the Service in accordance with these Terms. [...] You agree that you will not, and will not permit any agent or end user acting on your behalf to: Use the Service to send unsolicited marketing calls or messages, or any communication that violates the Telephone Consumer Protection Act (TCPA), the CAN-SPAM Act, the CRTC's Unsolicited Telecommunications Rules, or any other applicable law on consent, do-not-call lists, or message content. Impersonate a person, business, or government entity, or misrepresent the source, identity, or authority of a call or message — including spoofing caller ID in a way that violates the Truth in Caller ID Act or STIR/SHAKEN attestation requirements. Use the Service for fraud, phishing, harassment, threats, hate, sexual content involving minors, or any other unlawful purpose. Use the Service to provide emergency services. AgentPhone numbers are not a replacement for traditional 911 or E911. Attempt to bypass rate limits, reverse-engineer the Service, scrape internal endpoints, or interfere with carriers, peers, or other customers. Resell raw access to AgentPhone numbers, voice, or messaging without a written reseller agreement with us.

## Plan

- Pay: $0
- You get: $5
- Enough for: about 555 results

## Rate limit

- Batch: 25

## Speed

- Answer: in the call

## The call

- You send: phoneNumbers
- Method: GET
- Path: /v1/numbers/lookup

## About the plan

- Plan: Starting credit on signup
- Who can get it: anyone at least 18 years old and able to form a binding contract, with an account (the terms' section 2)

## The 4 fields the plan's answer can hold

phone number, line type, country, RCS enabled

## AgentPhone's plans (2)

- [AgentPhone, free](https://datacircle.dev/validate-phone-apis/agentphone/free/llms.txt): $0.00 per 1,000, 33% complete
- [AgentPhone, top-up](https://datacircle.dev/validate-phone-apis/agentphone/top-up/llms.txt): $9.00 per 1,000, 33% complete

## AgentPhone's calls (1)

- `GET /v1/numbers/lookup`: [AgentPhone, free](https://datacircle.dev/validate-phone-apis/agentphone/free/llms.txt)

## AgentPhone's APIs (1)

- [AgentPhone: phone validation API pricing, 2 plans](https://datacircle.dev/validate-phone-apis/agentphone/free/llms.txt)

## AgentPhone: phone validation API alternatives

- [HLR Lookup, £22.50 pack, 5,000 lookups, POST /apiv2/mnp, MNP-only lookup, full](https://datacircle.dev/validate-phone-apis/hlr-lookup/22-50-pack-5000-lookups-post-apiv2-mnp-mnp-only-lookup-full/llms.txt): $9.001 per 1,000, 89% complete, live
- [HLR Lookups, top-up from €20,000, 2.5M - 5M, POST /hlr-lookups](https://datacircle.dev/validate-phone-apis/hlr-lookups/top-up-from-20000-2-5m-5m-post-hlr-lookups/llms.txt): $9.002 per 1,000, 56% complete, live
- [Listar, top-up from €250,000, Elite, POST /search/verify-whatsapp](https://datacircle.dev/validate-phone-apis/listar/top-up-from-250000-elite-post-search-verify-whatsapp/llms.txt): $9.002 per 1,000, 22% complete, live
- [VerificarEmails, €40 pack, MNP: 5,000 Phones, GET /phonemnp/validate/single](https://datacircle.dev/validate-phone-apis/verificaremails/40-pack-mnp-5000-phones-get-phonemnp-validate-single/llms.txt): $9.002 per 1,000, 67% 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 2026-11-05.

- https://agentphone.ai/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://agentphone.ai/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://agentphone.ai/terms?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.agentphone.ai/api-reference/numbers/lookup-numbers-v-1-numbers-lookup-get?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.agentphone.ai/usage?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing