Datacircle

USACallerLookup Phone validation API pricing

USACallerLookup's siteThis page as plain textPhone validation API in 2026: the best of 60+ comparedUSACallerLookup: phone validation API alternatives

Is USACallerLookup yours? Write to us about our scores for this plan. We invite selected tool providers to our WhatsApp group.

44% complete: 4 of the 9 fields on our checklistSee the 9 fields
$0.00per 1,000 phonesIn our phone validation API benchmark, this plan scores 0.0 out of 100. USACallerLookup ranks 61st of 66 providers.We rank 1,494 plans for phone validation APIs by price. Half the plans cost $3.20 or less per 1,000 phones. This plan and 20 others tie for the lowest price per 1,000 phones of the 1,494 plans. 326 phone validation API plans on our price sheet are free. Trestle has a free plan with 25 calls in total. Trestle is the best phone validation API in our benchmark.Trestle, Signal House and Data247 are the best phone validation API providers in the Datacircle benchmark.
Type a number to see the cheapest USACallerLookup plan for that many phones. The table below then sorts the other plans by what each costs.
Plan: Free USACallerLookup's only plan
Call: GET /wp-json/ucl/v1/number/{phone} USACallerLookup's only call
API: Phone validation API USACallerLookup's only API

About this item

  • A copy at most 1 day old. USACallerLookup may answer from USACallerLookup's stored data instead of asking the carrier.
  • 4 of the 9 fields on our checklist. Formats, Validity, Carrier, Place.
  • Nothing to pay. USACallerLookup limits how many calls you get but gives no number.
  • One call. You send phone to GET /wp-json/ucl/v1/number/{phone}. The call returns whether the number is valid.
  • Anyone can get it. Keep data: no limit. Use data: with conditions.

USACallerLookup: phone validation API alternatives

USACallerLookup alternatives: every phone validation API provider ranked

We list other providers' plans closest to this plan in price per 1,000 phones. Each plan in the table gives live data or data at most a day old.

This planUSACallerLookup, freeSignal House, freeAbstract API, freeFoxentry, free trial, POST /phone/validate, Validate phone number (extended)HLR Lookups, free, 100 free lookups, POST /hlr-lookups
$ per 1,000 phones$0.00$0.00$0.00$0.00$0.00
Completeness44%44%89%56%56%
Billingfreefreefreefreefree
Pay$0$0$0$0$0
Enough fornot published5,000 calls, once100 calls a monthnot published100 results, once
Freshness1 daylive1 daylivelive
Who can get itanyoneanyone who creates an accountanyone 18 or olderanyone who signs up and creates an API projectnew accounts

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-10.

  1. usacallerlookup.com/api/
  2. usacallerlookup.com/wp-content/uploads/api/openapi.json

Product details

The key fields this plan's answer can hold, then each filled column in its row on the sheet.

  • Number, not in the answer
  • Formats
  • Validity
  • Type, not in the answer
  • Carrier
  • Porting and roaming, not in the answer
  • Place
  • Risk, not in the answer
  • Owner, not in the answer
Score
Overall score0.0. We give it 0 overall because its Accuracy score is 0.
Price score100
Accuracy score0
Cost to get started score100
Bundle score0
Performance score0. We could not measure how fast this provider answers a call, so we count it as 0.
Price
$ per 1,000 phones$0.00
Percall
Billingfree
Aggregators
Aggregatorsnone
Charges
Also pays fornothing else
Not found
$ per 1,000 calls that find nothing$0.00
In their words
Their pitchUSACallerLookup offers a free, read-only JSON API over our phone number and robocall complaint data. No API key, no signup, no cost.
Data
Freshness1 day
CountriesUnited States
What it checksnumbering plan
Keep datano limit
Use data"Use it in apps, research, call-blocking tools, or anything else." The data is "dedicated to the public domain under CC0" [...] "this API must not be used to determine eligibility for credit, employment, housing, or any other FCRA-regulated purpose."
Plan
Pay$0
Rate limit
Per second1
Batch1
Speed
Answerin the call
The call
You sendphone
MethodGET
Path/wp-json/ucl/v1/number/{phone}
About the plan
PlanFree
Who can get itanyone
The 16 fields the plan's answer can hold

formatted phone number, normalized phone number, toll-free, city, state, carrier, total complaints, robocall complaints, first seen, last seen, states reporting, complaint subject, complaints per subject, community reports, details URL, attribution

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