SignalWire pricing and alternatives: phone validation API, {e164_number}, Look up phone number

SignalWire's site llms.txt Best phone validation API in 2026

67% complete: 6 of the 9 key fields we checkSee the 9 fields

$5.00per 1,000 phonesHalf of the 237 plans we rank by price cost $5.401 per 1,000 or less. This plan costs less than 54% of the 237 plans.The cheapest plan we rank by price is Twilio, top-up, at $0.00 per 1,000.

Plan: Prepaid balance SignalWire's only plan

Top-up from $5, Prepaid balancePrepaid balance$5.00 per 1,000

Call: GET /api/relay/rest/lookup/phone_number/{e164_number}, Look up phone number one of SignalWire's 2 calls

API: Phone validation API SignalWire's only API

Phone validation API

About this item

Live. The call checks the number when you make it.
6 of the 9 key fields we check. Number, Formats, Validity, Type, Carrier, Place.
A balance you top up. You pay $5 or more. You spend all of it on calls. $5 is enough for 1,000 calls.
One call. You send e164_number to GET /api/relay/rest/lookup/phone_number/{e164_number}. You set include to "carrier". The call returns whether the number is valid.
Who can get it: with conditions. Keep data: no limit. Use data: with conditions.

SignalWire: phone validation API alternatives

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

	This planSignalWire, top-up from $5, Prepaid balance, GET /api/relay/rest/lookup/phone_number/{e164_number}, Look up phone number	VerificarEmails, €440 pack, MNP: 100,000 Phones, GET /phonemnp/validate/single	CheckThatPhone, $5 monthly	Xverify, $250 pack	CallerAPI, $25 monthly, Basic, GET /api/network-lookup/{phone}
$ per 1,000	$5.00	$4.951	$5.00	$5.00	$5.00
Completeness	67%	67%	78%	44%	44%
Billing	pay first	pay first	monthly	pay first	monthly
Pay	$5	€440	$5	$250	$25
Enough for	1,000 calls	100,000 calls	1,000 calls a month	50,000 calls	5,000 calls a month
Freshness	live	live	live (deactivation date, state DNC: 7 days)	live	live
Who can get it	anyone with a SignalWire space and a payment method, new accounts stay in Trial mode until at least $5 of credit is added	anyone	anyone	anyone	anyone with a Google account

Every phone validation API provider we score, ranked

Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-10-25.

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, not in the answer
Place
Risk, not in the answer
Owner, not in the answer

Price
$ per 1,000	$5.00
Billing	pay first

Aggregators
Aggregators	none

Charges
Per	call
Extra fields	caller ID name: +$8.00

In their words
Their pitch	Returns validity and formatting information for any supplied E.164 phone number, with optional carrier and caller-name data.

Data
Freshness	live
Keep data	no limit
Use data	"Customer retains ownership of all right, title, and interest in and to the Customer Content", which means content "generated by Customer via use of the SignalWire Services" (Cloud Agreement 4.D), "Customer may not engage in the illegal, harmful, or inappropriate use of the SignalWire Services" (6.B)

Plan
Pay	$5
You get	$5
Enough for	1,000 calls

Rate limit
Batch	1

Speed
Answer	in the call

The call
You send	e164_number, include "carrier"
Method	GET
Path	/api/relay/rest/lookup/phone_number/{e164_number}

About the plan
Plan	Prepaid balance
Who can get it	anyone with a SignalWire space and a payment method, new accounts stay in Trial mode until at least $5 of credit is added

The 18 fields the plan's answer can hold

country calling code, national number, possible number, valid number, national format, international format, E.164 format, location, country ISO2 code, time zones, number type, carrier OCN, carrier LATA, carrier city, carrier state, carrier jurisdiction, carrier LEC, line type