Block spam calls and turn them into revenue

Caller ID API for MVNOs, CPaaS, UCaaS and Voice AI. Block fraud and sell protection as a value-added service.

Get started Talk to sales
GET /api/lookup/+18885550147 200 OK 
{
  "phone": "+18885550147",
  "reputation": "SPAM",
  "is_spam": true,
  "spam_score": 94,
  "total_complaints": 87,
  "complaints": [
    {
      "Subject": "Reducing your debt",
      "ViolationDate": "2026-07-04"
    }
  ]
}

Trusted by teams at

Two ways it pays for itself

Cut what spam costs your platform, or sell protection to your customers. Most partners end up doing both.

Sell protection as a feature

MVNOs, CPaaS and UCaaS platforms resell spam protection and caller intelligence as a value-added service: a new revenue line that also keeps subscribers around longer.

Stop paying to answer spam

Voice AI platforms run call screening before agents pick up. Fraud never reaches the model, so LLM tokens and telephony minutes stop burning on callers who were never customers.

Building a call blocking app?

Mobile security vendors run their apps on the same blacklist, refreshed every minute, with a white-label SDK under their own brand.

Three ways to plug in

Telecom spam protection API, a self-hosted feed, or a fully white-labeled SDK inside your own app.

Caller ID API

One GET request returns a spam score, business identity and carrier data from the full 195-country database. The entry point for most platforms.

  • Spam status

    Score, reputation and complaint history per number, ready for spam call blocking.

  • Business identity

    Name, location and industry from 195 countries.

  • Carrier data

    Carrier, number type and portability, with optional HLR via the carrier lookup API.

GET /api/lookup/+16502530000 200 OK 
{
  "entity_type": "BUSINESS",
  "reputation": "VERIFIED",
  "is_spam": false,
  "business_info": {
    "business_name": "Google LLC",
    "city": "Mountain View",
    "country": "US",
    "industry": "Internet Services"
  }
}

Spam Database Feed

A spam-only blacklist you host yourself. Fresh entries every minute, 15 days of rolling history, zero lookup latency. The backbone of telecom fraud prevention at the switch.

60s

update cadence

15 days

rolling history

Call Blocking SDK

Native spam blocking inside your own app, under your own brand. Your subscribers see your name on every blocked call. The same data also powers VoIP caller ID for PBX and UCaaS stacks.

Swift Java / Kotlin Flutter React Native Asterisk

SIP Firewall

Drop fraud traffic at the network edge, before it touches your switch or your minutes. Works alongside the feed and the API.

Explore the SIP firewall

Results we can show. Names we can't.

Spam protection is part of our customers' competitive edge, so deployments sit behind NDAs. Here is recent work, anonymized.

Tens of thousands of dollars in new value-added service revenue

MVNOs, UCaaS providers and platforms with marketplaces resell our spam protection and caller intelligence under their own brand, and keep the margin on every subscriber who upgrades.

A fraud campaign, stopped

A Voice AI CPaaS platform came under a coordinated fraud call campaign. Screening dropped it before it reached their agents or burned their minutes.

Robocalls blocked, under their brand

Niche MVNOs ship robocall blocking to subscribers under their own name, powered by the minute-fresh feed. We stay invisible.

195

countries of business caller data

30

countries of live fraud detection

60s

between blacklist updates

Meets your stack where it is

Turnkey integrations for GoHighLevel, Aircall and Dialpad, licensed directly with pricing scoped to your deployment.

Talk to sales
G GoHighLevel
Aircall
D Dialpad
Asterisk

Start at $25. Scale to millions of calls.

Self-serve Caller ID API plans with instant access. Volume, feed and SDK deals are negotiated directly.

See all Caller ID API pricing tiers

Basic

$25/mo

  • 5,000 lookups per month
  • Spam detection and business caller ID
  • No-code integrations
Start now

Premium

Most popular

$99/mo

  • 20,000 lookups per month
  • Everything in Basic
  • Priority support
Start now

Enterprise

$997 pay-per-use

  • 250,000+ lookups
  • Everything in Premium
  • Scalable pricing
Start now

Passing 300,000 lookups a month?

Volume plans run from $1,000 per month up to 50M+ monthly lookups, priced per tier. Tell us your traffic and we quote the exact step.

Talk to sales

Spam Database Feed

The minute-fresh blacklist, hosted on your side. Priced to your deployment.

Talk to sales

SDK & integrations licensing

Flat fee, or per subscriber per month with active call blocking. Structured around your business model.

Talk to sales
Dmitry B, founder of CallerAPI

A note from the founder

I run CallerAPI hands-on. Every case above is real work I was personally in the room for, and every name is protected because our data is part of how those companies win. You get the same discretion.

If you sit anywhere in the call path, tell me what you are dealing with. You will talk to me directly, not a sales team.

Dmitry B.

Founder & CEO, CallerAPI

Speak to the founder

Common questions

Start blocking spam calls today

Grab an API key and make your first lookup in minutes, or run a free caller ID test on any number first.

Get started Talk to sales