# QuantAgentShop, pay as you go: Phone validation API

> Phone number check. Send a number in any format, with a + country code or a region such as GB, returns E.164, international and national formats, valid and possible flags, country code, region, line type (mobile, fixed line, toll free and others), place and time zones.

QuantAgentShop's Pay per call with x402 plan for the phone validation API costs $9.90 per 1,000 phones. We check each provider's docs for 9 fields. QuantAgentShop's docs list 5: Number, Formats, Validity, Type, Place.
We haven't run QuantAgentShop through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
We rank 1,266 plans for phone validation APIs by price. Half the plans cost $3.55 or less per 1,000 phones. This plan costs less per 1,000 phones than 26% of the 1,266 plans.
[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. [Neutrino API's On-Demand plan](https://datacircle.dev/validate-phone-apis/neutrino-api/pay-as-you-go-on-demand/llms.txt) costs the least for 10,000 phones a month: $0.80.
[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/quantagentshop/pay-as-you-go
- [Phone validation API: the best of 50+ providers compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://quantagentshop.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `POST https://quantagentshop.com/v1/phone-check`
- API key: not needed
- Its API docs: https://quantagentshop.com/tools/phone-check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Sold by: QuantAgentShop (https://quantagentshop.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-08

## In the answer

- Completeness: 56%
- Number: ✓
- Formats: ✓
- Validity: ✓
- Type: ✓
- Place: ✓

## Price

- $ per 1,000 phones: $9.90
- Per: call
- Billing: pay as you go

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## In their words

- Their pitch: Phone number check. Send a number in any format, with a + country code or a region such as GB, returns E.164, international and national formats, valid and possible flags, country code, region, line type (mobile, fixed line, toll free and others), place and time zones.

## Data

- Freshness: stored
- What it checks: numbering plan
- Keep data: no limit
- Use data: What this shop makes from your input (PDFs, QR codes, summaries, extractions, grades, scores, hashes and the layout of every result) is yours to use, store and redistribute freely. Data that comes from a third party stays under that source's terms, linked below, where a licence asks for credit, the result carries an attribution line to keep with it. [...] Do not use the service for anything unlawful. [...] Results are provided as they come from public sources and providers, without warranty.

## Plan

- Pay: per call

## Rate limit

- Concurrent: 1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: number. Optional: region
- Method: POST
- Path: /v1/phone-check

## About the plan

- Plan: Pay per call with x402
- Who can get it: anyone, with no account or API key, paying each call in USDC on Base (x402)

## The 16 fields the plan's answer can hold

input, valid, possible, E.164 format, international format, national format, country code, region, line type, location, range carrier, time zones, extension, reason, notice, checked at

## QuantAgentShop's plans (1)

- [QuantAgentShop, pay as you go](https://datacircle.dev/validate-phone-apis/quantagentshop/pay-as-you-go/llms.txt): $9.90 per 1,000, 56% complete, stored

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

- `POST /v1/phone-check`: [QuantAgentShop, pay as you go](https://datacircle.dev/validate-phone-apis/quantagentshop/pay-as-you-go/llms.txt)

## QuantAgentShop's APIs (6)

- [QuantAgentShop: business verification API pricing, 1 plan](https://datacircle.dev/business-verification-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: IP company lookup API pricing, 1 plan](https://datacircle.dev/ip-company-lookup-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: phone validation API pricing, 1 plan](https://datacircle.dev/validate-phone-apis/quantagentshop/pay-as-you-go/llms.txt)
- [QuantAgentShop: web scraping API pricing, 1 plan](https://datacircle.dev/web-scraping-apis/quantagentshop/pay-as-you-go/llms.txt)

## QuantAgentShop: phone validation API alternatives

- [Tomba, $199 monthly](https://datacircle.dev/validate-phone-apis/tomba/199-monthly/llms.txt): $9.95 per 1,000, 11% complete, stored
- [ProWebLook, $4.99 pack](https://datacircle.dev/validate-phone-apis/proweblook/4-99-pack/llms.txt): $9.98 per 1,000, 67% complete, stored
- [Xverify, $5 pack](https://datacircle.dev/validate-phone-apis/xverify/5-pack/llms.txt): $10.00 per 1,000, 44% complete, stored
- [YepAPI, top-up](https://datacircle.dev/validate-phone-apis/yepapi/top-up/llms.txt): $10.00 per 1,000, 44% 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 2026-11-08.

- https://quantagentshop.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://quantagentshop.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://quantagentshop.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://quantagentshop.com/policies?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://quantagentshop.com/tools/phone-check?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing