# Foundry, pay as you go: Phone validation API

> Phone number validator: validity, E.164 and international format, type, region, carrier and timezone. Input: '+44 20 7946 0958'.

Foundry's x402 pay per call plan for the phone validation API costs $1.00 per 1,000 phones. We check each provider's docs for 9 fields. Foundry's docs list 6: Number, Formats, Validity, Type, Carrier, Place.
We haven't run Foundry through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
We rank 1,283 plans for phone validation APIs by price. Half the plans cost $3.60 or less per 1,000 phones. This plan costs less per 1,000 phones than 67% of the 1,283 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/foundry/pay-as-you-go
- [Phone validation API: the best of 50+ providers compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://minty-sprout.onrender.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `POST https://minty-sprout.onrender.com/v1/phone-validate`
- API key: not needed
- Its API docs: https://minty-sprout.onrender.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing#/paths/~1v1~1phone-validate
- Sold by: Foundry (https://minty-sprout.onrender.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 67%
- Number: ✓
- Formats: ✓
- Validity: ✓
- Type: ✓
- Carrier: ✓
- Place: ✓

## Price

- $ per 1,000 phones: $1.00
- Per: call
- Billing: pay as you go

## Aggregators

- Aggregators: none

## Charges

- Also pays for: nothing else

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Phone number validator: validity, E.164 and international format, type, region, carrier and timezone. Input: '+44 20 7946 0958'.

## Data

- What it checks: numbering plan
- Keep data: no API terms
- Use data: no API terms

## Plan

- Pay: per call

## Rate limit

- Per second: 0.5
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: input
- Method: POST
- Path: /v1/phone-validate

## About the plan

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

## The 11 fields the plan's answer can hold

phone number, valid, possible, E.164 format, international format, country calling code, region, location, line type, carrier, timezones

## Foundry's plans (1)

- [Foundry, pay as you go](https://datacircle.dev/validate-phone-apis/foundry/pay-as-you-go/llms.txt): $1.00 per 1,000, 67% complete

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

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

## Foundry's APIs (7)

- [Foundry: tech stack API pricing, 1 plan](https://datacircle.dev/company-technology-apis/foundry/pay-as-you-go/llms.txt)
- [Foundry: domain WHOIS API pricing, 1 plan](https://datacircle.dev/domain-whois-apis/foundry/pay-as-you-go/llms.txt)
- [Foundry: email verification API pricing, 1 plan](https://datacircle.dev/validate-email-apis/foundry/pay-as-you-go/llms.txt)
- [Foundry: IP company lookup API pricing, 1 plan](https://datacircle.dev/ip-company-lookup-apis/foundry/pay-as-you-go/llms.txt)
- [Foundry: phone validation API pricing, 1 plan](https://datacircle.dev/validate-phone-apis/foundry/pay-as-you-go/llms.txt)
- [Foundry: GitHub repository API pricing, 1 plan](https://datacircle.dev/github-repository-apis/foundry/pay-as-you-go/llms.txt)
- [Foundry: web scraping API pricing, 1 plan, POST /v1/readability](https://datacircle.dev/web-scraping-apis/foundry/pay-as-you-go-x402-pay-per-call-post-v1-readability/llms.txt)
- [Foundry: web scraping API pricing, 1 plan, POST /v1/html-to-markdown](https://datacircle.dev/web-scraping-apis/foundry/pay-as-you-go-x402-pay-per-call-post-v1-html-to-markdown/llms.txt)
- [Foundry: web scraping API pricing, 1 plan, POST /v1/website-metadata](https://datacircle.dev/web-scraping-apis/foundry/pay-as-you-go-x402-pay-per-call-post-v1-website-metadata/llms.txt)

## Foundry: phone validation API alternatives

- [CallerAPI, $12,000 monthly, Enterprise transparency $12,000, GET /api/lookup/{phone}](https://datacircle.dev/validate-phone-apis/callerapi/12000-monthly-enterprise-transparency-12000-get-api-lookup-phone/llms.txt): $1.00 per 1,000, 78% complete, stored
- [ReefAPI, $50 monthly, Ultra monthly, POST /phone-validate/v1/validate](https://datacircle.dev/validate-phone-apis/reefapi/50-monthly-ultra-monthly-post-phone-validate-v1-validate/llms.txt): $1.00 per 1,000, 67% complete, stored
- [DomScan, $10 pack, 10,000 credits, POST /v1/phone/validate/bulk](https://datacircle.dev/validate-phone-apis/domscan/10-pack-10000-credits-post-v1-phone-validate-bulk/llms.txt): $1.00 per 1,000, 67% complete, stored
- [apipick, $5 pack, 5,000 credits, POST /api/check-china-phone](https://datacircle.dev/validate-phone-apis/apipick/5-pack-5000-credits-post-api-check-china-phone/llms.txt): $1.00 per 1,000, 33% complete

## Sources

From each provider's own pricing page and docs, and from what providers tell us. We read this row from these pages on 2026-11-09.

- https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://minty-sprout.onrender.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://minty-sprout.onrender.com/.well-known/x402?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://minty-sprout.onrender.com/llms.txt?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://minty-sprout.onrender.com/openapi.json?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing