# Linq, free, Hobby, POST /v3/capability/check_imessage: Phone validation API

> Check whether a recipient address supports iMessage or RCS before sending a message.

Linq's Hobby plan for the phone validation API costs $0.00 per 1,000 phones. We check each provider's docs for 9 fields: Number, Formats, Validity, Type and 5 more. Linq's docs list none of the 9.
Linq limits how many calls you get but gives no number.
We haven't run Linq through [our phone validation API benchmark](https://datacircle.dev/best-phone-validation-api.txt) yet.
This plan is free. We leave this plan out of our price ranking because the provider bans business use. We rank 1,342 plans for phone validation APIs by price. Half the plans cost $3.867 or less per 1,000 phones. [See the best free phone validation API plan.](https://datacircle.dev/best-phone-validation-api.txt)
[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. [Keyronne's pay-as-you-go plan](https://datacircle.dev/validate-phone-apis/keyronne/pay-as-you-go/llms.txt) costs the least for 10,000 phones a month: $0.20.
[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), [Signal House](https://datacircle.dev/validate-phone-apis/signal-house/top-up-from-10/llms.txt) and [Data247](https://datacircle.dev/validate-phone-apis/data247/12-pack-membership-get-v3-0-verify247-phone/llms.txt) are the best phone validation API providers in the Datacircle benchmark.

- This page: https://datacircle.dev/validate-phone-apis/linq/free-hobby-post-v3-capability-check-imessage
- [Phone validation API in 2026: the best of 60+ compared](https://datacircle.dev/best-phone-validation-api.txt)
- Get it: https://linqapp.com/s/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Request: `POST https://api.linqapp.com/api/partner/v3/capability/check_imessage`
- API key: with the plan, on https://linqapp.com/s/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Its API docs: https://docs.linqapp.com/channel/imessage/api/resources/capability/methods/check_imessage/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- Sold by: Linq (https://linqapp.com?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing)
- Checked: 2026-11-09

## In the answer

- Completeness: 0%

## Price

- $ per 1,000 phones: $0.00
- Per: call
- Billing: free

## Aggregators

- Aggregators: none

## Charges

- Also pays for: 75 other Linq calls · from the same budget: Check RCS capability

## Not found

- $ per 1,000: $0.00

## In their words

- Their pitch: Check whether a recipient address supports iMessage or RCS before sending a message.

## Data

- Freshness: live
- What it checks: messaging apps
- Keep data: no limit
- Use data: Linq grants Customer a limited, revocable, non-exclusive, non-transferable, non-sublicensable right during the Term to access and use the Service and Documentation solely for Customer’s internal business purposes to develop, test, and support applications that interoperate with the Service. [...] Customer will not (and will not permit any third-party to): copy, modify, or create derivative works of the Service (except as expressly permitted in Documentation), reverse engineer, decompile, or attempt to discover source code or underlying algorithms (except to the extent prohibited by law), access or use the Service to build or benchmark a competing product, remove any proprietary notices from the Service or Documentation, use the Service in any manner or for any purpose that infringes, misappropriates, or otherwise violates any intellectual property right or other right (including privacy right) of any person, or that violates Applicable Law, interfere with or disrupt the Service, including by circumventing safeguards, monitoring, filters, or rate limits, or use the Service outside the scope of these Terms, the AUP, or Documentation.

## Plan

- Pay: $0

## Rate limit

- Per second: 0.1
- Batch: 1

## Speed

- Answer: in the call

## The call

- You send: address. Optional: from
- Method: POST
- Path: /v3/capability/check_imessage

## About the plan

- Plan: Hobby
- Who can get it: anyone who signs up through the CLI, for hobbyist and personal projects, legally able to enter into the Terms

## The 4 fields the plan's answer can hold

address, available on iMessage, reason unavailable, selected service

## Linq's plans (3)

- [Linq, free, Hobby, POST /v3/capability/check_imessage](https://datacircle.dev/validate-phone-apis/linq/free-hobby-post-v3-capability-check-imessage/llms.txt): $0.00 per 1,000, 0% complete, live
- [Linq, $260 monthly, Pro, POST /v3/capability/check_imessage](https://datacircle.dev/validate-phone-apis/linq/260-monthly-pro-post-v3-capability-check-imessage/llms.txt): 0% complete, live
- [Linq, contact us, Enterprise, POST /v3/capability/check_imessage](https://datacircle.dev/validate-phone-apis/linq/contact-us-enterprise-post-v3-capability-check-imessage/llms.txt): 0% complete, live

## Linq's calls (2)

- `POST /v3/capability/check_imessage`: [Linq, free, Hobby, POST /v3/capability/check_imessage](https://datacircle.dev/validate-phone-apis/linq/free-hobby-post-v3-capability-check-imessage/llms.txt)
- `POST /v3/capability/check_rcs`: [Linq, free, Hobby, POST /v3/capability/check_rcs](https://datacircle.dev/validate-phone-apis/linq/free-hobby-post-v3-capability-check-rcs/llms.txt)

## Linq's APIs (1)

- [Linq: phone validation API pricing, 3 plans, POST /v3/capability/check_imessage](https://datacircle.dev/validate-phone-apis/linq/free-hobby-post-v3-capability-check-imessage/llms.txt)

## Linq: phone validation API alternatives

- [Signal House, free](https://datacircle.dev/validate-phone-apis/signal-house/free/llms.txt): $0.00 per 1,000, 44% complete, live
- [Foxentry, free trial, POST /phone/validate, Validate phone number (extended)](https://datacircle.dev/validate-phone-apis/foxentry/free-trial-post-phone-validate-validate-phone-number-extended/llms.txt): $0.00 per 1,000, 56% complete, live
- [HLR Lookups, free, 100 free lookups, POST /hlr-lookups](https://datacircle.dev/validate-phone-apis/hlr-lookups/free-100-free-lookups-post-hlr-lookups/llms.txt): $0.00 per 1,000, 56% complete, live
- [seven.io, free test credit, GET /api/lookup/hlr](https://datacircle.dev/validate-phone-apis/seven-io/free-test-credit-get-api-lookup-hlr/llms.txt): $0.00 per 1,000, 78% complete, live

## 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://cdn.linqapp.com/openapi/linq-api-v3.yaml?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.linqapp.com/channel/imessage/guides/chats/capability-checks/?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://docs.linqapp.com/channel/imessage/guides/platform/rate-limits?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://linqapp.com/cli?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://linqapp.com/policies/terms-of-service-and-sale?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing
- https://linqapp.com/s/pricing?utm_source=datacircle.dev&utm_medium=referral&utm_campaign=phone-validation-api-pricing