Comparison

CheckThatPhone vs Abstract API: porting and compliance checks in 2 countries, or reach in 190+

CheckThatPhone is an Abstract API alternative for US and Canadian numbers. Both return the carrier, the line type (VoIP included) and whether the line is in service; CheckThatPhone adds the porting status and routing number, a send-or-not verdict and TCPA or DNC screening in the same call. Abstract's phone API covers 190+ countries, from $19 a month for 5,000 requests. CheckThatPhone covers only the US and Canada, from $5 a month for 1,000 lookups. At 100,000 lookups a month that's $100 on our 100K plan against $199 for Abstract Starter's 150,000 tier; at 5,000 Abstract is lower, $19 against our $25. Either way, one CheckThatPhone lookup also includes the ported flag and routing number, a send-or-not verdict for texts and location from your visitor's IP in the same call, which an Abstract Starter request doesn't (what each includes).

If you need numbers outside North America, a free plan with no card, or registered-name, risk and breach data, Abstract is the better fit. If you call or text North American numbers, the porting, deliverability and compliance fields are what CheckThatPhone adds.

As of October 3, 2026, read from Abstract's own product, pricing and documentation pages. Each Abstract fact links to the page it came from. A few were read later, on October 10, 2026, and are dated where they appear. Prices change, so check the source before you commit budget. CheckThatPhone is our product. How we compare vendors.

At a glance

Cost at different volumes

Base lookups each month, monthly billing. Abstract figures use the Starter plan, which its pricing FAQ names as the plan that returns carrier and line type, at the smallest listed volume that covers the month. Abstract's pages list fixed volumes and no overage rate, and point to Enterprise pricing above 150,000 requests a month. CheckThatPhone figures are the cheapest plan including overage.

Neither is cheaper at every volume. Abstract comes out lower at 5,000 a month and, by a dollar, at 50,000. CheckThatPhone is lower at 10,000 and 100,000, and its self-serve plans keep going past 150,000, where Abstract moves to custom pricing. Where Abstract is lower, compare what each request includes. Abstract's Standard and Professional plans add data at the same price by including fewer requests, while every CheckThatPhone plan returns the full response and only the litigator scrub and landline SMS lookup cost extra.

What one request includes

A lower price per request only compares like with like when the requests return the same data. One CheckThatPhone lookup also includes the ported flag and routing number, a send-or-not verdict for texts and location from your visitor's IP in the same call, which a request to Abstract API (Starter plan) doesn't.

✓ included ◐ included with a limit + a separately priced package or API – not in the documented request or response

Operational terms

Commitments, limits and support, from each side's own published pages. Where a page doesn't state a term, the table says so.

Not published means it isn't stated on the Abstract pages listed under Sources when we read them. It doesn't mean Abstract doesn't offer it. Our column follows the same rule, using only our own pricing, docs, terms and contact pages.

Which one to choose

Example request and response

A standard CheckThatPhone lookup:

curl --request POST \
  --url 'https://api.checkthatphone.com/v1/lookup' \
  --header 'Authorization: Bearer YOUR_API_KEY' \
  --header 'Content-Type: application/json' \
  --data '{"phone": "312-555-0188"}'

An illustrative response (a fictional 555 number; field names and formats match the live API). The fields with no counterpart in Abstract's documented response are the porting fields (dipLrn, dipPorted), dipOcn and action:

{
  "success": true,
  "credits_used": 1,
  "data": {
    "subscriber": "3125550188",
    "optDate": "2026-10-03T16:04:11.210Z",
    "action": "send",
    "deliverable": "true",
    "reason": "",
    "nanpType": "mobile",
    "blackList": "false",
    "dip": "success",
    "dipLrn": "3125550188",
    "dipPorted": "false",
    "dipOcn": "6010",
    "dipCarrier": "AT&T",
    "dipCarrierSubType": "WIRELESS",
    "dipCarrierType": "mobile",
    "geoState": "IL",
    "geoCity": "chicago",
    "geoCountry": "US",
    "geoSource": "area-code",
    "timezone": "America/Chicago",
    "tzOffset": 6,
    "error": "false"
  }
}

Sources

Abstract pages, with the date we read each one:

• Abstract Phone Validation API product page and FAQ (read October 3, 2026 and October 10, 2026)
• Abstract pricing page (Phone Validation plans, FAQ and sample responses) (read October 3, 2026 and October 10, 2026)
• Abstract Phone Intelligence API documentation (response fields, bulk upload, billing) (read October 3, 2026 and October 10, 2026)

CheckThatPhone figures come from our pricing page, API documentation and terms of service.

Related

• All comparisons and the cost at different volumes: CheckThatPhone compared
• Other options: vs Twilio Lookup, vs Numverify, vs Vonage Number Insight and vs Trestle
• Eight vendors side by side: Phone validation API pricing in 2026