# CallerAPI, free: Cached phone validation API

> /api/lookup is a spam score and caller reputation lookup: a 0 to 100 score, the complaints behind it, and the business name with a verified flag. Carrier and HLR data only come back when you add hlr=true. We are different from the other providers because we don’t just provide HLR, but also spam number lookup and business name lookup, all in one endpoint, for the same price.

CallerAPI's cached phone validation API on its Free trial plan. It costs $0.00 per 1,000 phones. It returns 7 of the 9 key fields we check: Number, Formats, Validity, Type, Carrier, Porting and roaming, Place.
The cheapest of the 109 plans we rank by price is [seven.io, free](https://datacircle.dev/cached-phone-validation-apis/seven-io/free/llms.txt), at $0.00 per 1,000 phones.

- This page: https://datacircle.dev/cached-phone-validation-apis/callerapi/free
- [Best phone validation API in 2026](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://callerapi.com/pricing
- Request: `GET https://api.callerapi.com/api/lookup/{phone}`
- API key: with the plan, on https://callerapi.com/pricing
- Its API docs: https://docs.callerapi.com/spam-score-hlr-19887237e0.md
- Sold by: CallerAPI (https://callerapi.com)
- Checked: 2026-10-27

## In the answer

- Completeness: 78%
- Number: ✓
- Formats: ✓
- Validity: ✓
- Type: ✓
- Carrier: ✓
- Porting and roaming: ✓
- Place: ✓

## Price

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

## Aggregators

- Aggregators: none

## Charges

- Also pays for: from the same budget: Carrier lookup API · Score a transcript or a recording · Announce a call

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: /api/lookup is a spam score and caller reputation lookup: a 0 to 100 score, the complaints behind it, and the business name with a verified flag. Carrier and HLR data only come back when you add hlr=true. We are different from the other providers because we don’t just provide HLR, but also spam number lookup and business name lookup, all in one endpoint, for the same price.

## Data

- Freshness: stored
- Countries: Worldwide
- What it checks: carrier
- Keep data: no limit
- Use data: "You may not: Use the Service for any illegal purpose, Attempt to reverse engineer the Service, Share your API key or access credentials with third parties, Use the Service in a manner that could damage, disable, or impair our servers or networks" (Terms of Service 3), "You must obtain and maintain all necessary consents from individuals whose data you access or collect through the Service" (4), "a limited, non-exclusive, non-transferable license to use the Service in accordance with these Terms" (5)

## Plan

- Pay: $0
- You get: 100 credits
- Enough for: 100 calls

## Rate limit

- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: phone. Optional: hlr
- Method: GET
- Path: /api/lookup/{phone}

## About the plan

- Plan: Free trial
- Who can get it: anyone can apply: "our AI scores your profile and decides to give it to you or not. Or maybe you'll need to jump on a call with us to discuss it further"

## The 38 fields the plan's answer can hold

phone number, status, entity type, reputation, spam flag, spam score, total complaints, complaint created date, complaint violation date, complaint consumer state, complaint subject, complaint robocall flag, complaint comment, business name, business category, business industry, business city, business state, business country, business verified, country calling code, country ISO code, country name, carrier, carrier type, OCN, SPID, original carrier, original SPID, landline, mobile, local format, LRN, MSISDN, ported, ported date, line type, valid

## CallerAPI's plans (13)

- [CallerAPI, free](https://datacircle.dev/cached-phone-validation-apis/callerapi/free/llms.txt): $0.00 per 1,000, 78% complete, stored
- [CallerAPI, $997 pack](https://datacircle.dev/cached-phone-validation-apis/callerapi/997-pack/llms.txt): $3.988 per 1,000, 78% complete, stored
- [CallerAPI, $25 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/25-monthly/llms.txt): $5.00 per 1,000, 78% complete, stored
- [CallerAPI, $99 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/99-monthly/llms.txt): $4.95 per 1,000, 78% complete, stored
- [CallerAPI, $1,000 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/1000-monthly/llms.txt): $3.333 per 1,000, 78% complete, stored
- [CallerAPI, $2,000 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/2000-monthly/llms.txt): $2.50 per 1,000, 78% complete, stored
- [CallerAPI, $3,500 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/3500-monthly/llms.txt): $1.75 per 1,000, 78% complete, stored
- [CallerAPI, $5,500 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/5500-monthly/llms.txt): $1.375 per 1,000, 78% complete, stored
- [CallerAPI, $8,000 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/8000-monthly/llms.txt): $1.143 per 1,000, 78% complete, stored
- [CallerAPI, $12,000 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/12000-monthly/llms.txt): $1.00 per 1,000, 78% complete, stored
- [CallerAPI, $18,000 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/18000-monthly/llms.txt): $0.90 per 1,000, 78% complete, stored
- [CallerAPI, $25,000 monthly](https://datacircle.dev/cached-phone-validation-apis/callerapi/25000-monthly/llms.txt): $0.714 per 1,000, 78% complete, stored
- [CallerAPI, contact us](https://datacircle.dev/cached-phone-validation-apis/callerapi/contact-us-enterprise-transparency-40000/llms.txt): 78% complete, stored

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

- `GET /api/lookup/{phone}`: [CallerAPI, free](https://datacircle.dev/cached-phone-validation-apis/callerapi/free/llms.txt)

## CallerAPI's APIs (2)

- [CallerAPI: phone validation API pricing, 13 plans, GET /api/network-lookup/{phone}](https://datacircle.dev/validate-phone-apis/callerapi/free-trial-get-api-network-lookup-phone/llms.txt)
- [CallerAPI: phone validation API pricing, 13 plans, GET /api/ported/{phone}](https://datacircle.dev/validate-phone-apis/callerapi/free-trial-get-api-ported-phone/llms.txt)
- [CallerAPI: phone validation API pricing, 13 plans, GET /api/porting-history/{phone}](https://datacircle.dev/validate-phone-apis/callerapi/free-trial-get-api-porting-history-phone/llms.txt)
- [CallerAPI: cached phone validation API pricing, 13 plans](https://datacircle.dev/cached-phone-validation-apis/callerapi/free/llms.txt)

## CallerAPI: cached phone validation API alternatives

- [Veriphone, $390 yearly, Professional, GET /v3/verify, /v3/verify](https://datacircle.dev/cached-phone-validation-apis/veriphone/390-yearly/llms.txt): $0.65 per 1,000, 78% complete, stored
- [BigDataCloud, $799 yearly, Silver, GET /data/phone-number-validate-by-ip](https://datacircle.dev/cached-phone-validation-apis/bigdatacloud/799-yearly-silver-get-data-phone-number-validate-by-ip/llms.txt): $0.666 per 1,000, 56% complete, stored
- [ProWebLook, $37.50 pack](https://datacircle.dev/cached-phone-validation-apis/proweblook/37-50-pack/llms.txt): $0.75 per 1,000, 67% complete, stored
- [APIVerve, $299.99 monthly](https://datacircle.dev/cached-phone-validation-apis/apiverve/299-99-monthly/llms.txt): $0.75 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://callerapi.com
- https://callerapi.com/carrier-lookup-api
- https://callerapi.com/cnam-lookup-api
- https://callerapi.com/llms.txt
- https://callerapi.com/lrn-lookup-api
- https://callerapi.com/pricing
- https://callerapi.com/robocall-scoring-api
- https://callerapi.com/terms-of-service
- https://docs.callerapi.com/announce-a-call-43957286e0.md
- https://docs.callerapi.com/balance-and-email-20033243e0.md
- https://docs.callerapi.com/limits-and-thresholds-2432315m0.md
- https://docs.callerapi.com/score-a-transcript-or-a-recording-43843796e0.md
- https://docs.callerapi.com/spam-score-hlr-19887237e0.md