SMS.to pricing: phone validation API, POST /api/v2/lookup, Instant Single Number HLR Lookup

SMS.to's site llms.txt Phone validation API: 40+ providers compared SMS.to: phone validation API alternatives

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78% complete: 7 of the 9 key fields we checkSee the 9 fields

$0.00per 1,000 phonesWe haven't run SMS.to through our phone validation API benchmark yet.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 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, Foxentry and HLR Lookups are the best phone validation API providers in the Datacircle benchmark.

Plan: Free trial one of SMS.to's 2 plans

Call: POST /api/v2/lookup, Instant Single Number HLR Lookup one of SMS.to's 2 calls

API: Phone validation API SMS.to's only API

Phone validation API

About this item

Live. SMS.to checks the phone number you send when you call the API.
7 of the 9 key fields we check. Number, Formats, Validity, Type, Carrier, Porting and roaming, Place.
Nothing to pay.
One call. You send number to POST /api/v2/lookup. You set the Accept header to "application/json" and the Content-Type header to "application/json". You can also send default_prefix. The call returns whether the number is valid.
Who can get it: anyone of legal age to form a binding contract. Keep data: no limit. Use data: with conditions.

SMS.to: phone validation API alternatives

SMS.to 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.

	This planSMS.to, free trial, POST /api/v2/lookup, Instant Single Number HLR Lookup	Foxentry, free trial, POST /phone/validate, Validate phone number (extended)	HLR Lookups, free, 100 free lookups, POST /hlr-lookups	seven.io, free test credit, GET /api/lookup/hlr	HLR Lookup, free, 200 free credits, POST /batches/{id}/sourcejson, Bulk uploads via API
$ per 1,000 phones	$0.00	$0.00	$0.00	$0.00	$0.00
Completeness	78%	56%	56%	78%	89%
Billing	free	free	free	free	free
Pay	$0	$0	$0	$0	$0
Enough for	not published	not published	100 results, once	not published	200 results, once
Freshness	live	live	live	live	live
Who can get it	anyone of legal age to form a binding contract	anyone who signs up and creates an API project	new accounts	new accounts of traders: the customer assures that he is a trader and that the short messages are sent as part of his business	new accounts with a business email address

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-04.

Product details

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

Number
Formats
Validity
Type
Carrier
Porting and roaming
Place
Risk, not in the answer
Owner, not in the answer

Price
$ per 1,000 phones	$0.00
Billing	free

Aggregators
Aggregators	none

Charges
Also pays for	nothing else

Not found
$ per 1,000	$0.00

In their words
Their pitch	HLR lookup gives you live status and the home network profile. Good for reachability and basic routing.

Data
Freshness	live
What it checks	carrier, line in service
Keep data	no limit
Use data	You will at all times keep confidential all information acquired as a consequence of using Our Services, except for information already in the public domain or information which You are required to disclose by law, requested by any Regulator or reasonably required by your professional advisors for the performance of their professional services. [...] You warrant that You will not: Use the Services or permit the Services to be used to send Chargeable Events to any end-user for marketing purposes without that end-user’s explicit request for, or prior consent, to receiving them. If you are sending any Chargeable Event for commercial purposes to any of your end-users, You must abide by the telephone marketing practices of the end-users’ jurisdiction, including but not limited to, obtaining prior express written consent from those end-users, and give all end-users the right to opt out of receiving any further Chargeable Events sent by You for commercial purposes (and You shall promptly process any end-user’s election to opt out), Use the Services or permit the Services to be used to convey Chargeable Events to any end-user, with a frequency and in numbers which are excessive in Our reasonable opinion, Use the Services or permit the Services to be used for any improper, fraudulent, immoral or unlawful purpose, Use the Services or permit the Services to be used for the transmission of any material which is of a defamatory, offensive, abusive, obscene or menacing character or nature, Use the Services or permit the Services to be used in a manner that infringes the intellectual property rights or any other proprietary rights of any third party, or Use the Services or permit the Services to be used in a manner that may injure or damage any person or property or cause the quality of the Services to be impaired. In addition, you must not use the Services to: send unsolicited bulk messages (“spam”) or messages to recipients who have not validly opted-in, engage in phishing, smishing, fraud, or any deceptive or misleading practice, send messages promoting illegal goods or services, impersonate any person, company or institution without lawful authorisation, bypass or attempt to bypass carrier filters, blocks or anti-spam systems, artificially inflate traffic or generate messages solely to trigger callbacks, replies or billing events, use SIM farms, grey routes or other unauthorised routing methods.

Plan
Pay	$0

Rate limit
Batch	1

Speed
Answer	in the call

The call
You send	number, Accept header "application/json", Content-Type header "application/json". Optional: default_prefix
Method	POST
Path	/api/v2/lookup

About the plan
Plan	Free trial
Who can get it	anyone of legal age to form a binding contract

The 21 fields the plan's answer can hold

phone number, formatted number, line status, country code, mobile country code, carrier name, mobile network code, IMSI, ported, ported carrier name, ported mobile network code, roaming, roaming country code, roaming network, line type, report ID, lookup type, cost, currency, created at, updated at