Should we use the API or the feed?

Use the API when you decide call by call. One GET returns the spam score at call setup, and you pay per lookup. Use the feed when you block at the switch or on the device. You host the full list, pay one flat fee, and add no lookup to the call path. Many partners run both.

How do voice AI platforms save money with it?

Check the caller number before the AI agent answers. Spam and robocalls are dropped or sent to voicemail, so they never use LLM tokens, speech minutes or telephony minutes.

Can we resell CallerAPI data as our own feature?

Yes. That is how most MVNO, CPaaS, UCaaS and mobile security customers use it: spam protection sold as a paid tier under their own brand. You set the price. CallerAPI stays invisible to your end users.

Is the spam feed a DNO list?

No. A reasonable DNO list holds numbers that should never call: invalid, unallocated, unused and inbound-only. The feed holds numbers that people reported in the last 15 days. Run both.

Which countries does CallerAPI cover?

Spam reports from 195 countries. The API and the feed use the same data.

How fresh is the spam data?

The feed updates every minute and carries 15 days of rolling spam history, so numbers that went quiet age out and active spammers stay blocked.

How is the Call Blocking SDK licensed?

Terms are negotiated directly: either a flat fee, or a per subscriber per month rate for subscribers with active call blocking. The SDK is fully white-label and available for Swift, Java/Kotlin, Flutter and React Native, plus an Asterisk module.

Does the SDK see our subscribers' phone numbers?

No. On iOS the call blocking SDK uses Apple Live Caller ID Lookup with private information retrieval and homomorphic encryption. On Android it uses k-anonymity. We never receive the number being checked, so a leak of subscriber call logs cannot happen on our side.

How do the GoHighLevel, Aircall and Dialpad integrations work?

They are licensed under direct commercial agreements rather than self-serve signup. Contact CallerAPI to scope the integration and agree on pricing for your deployment.

Enterprise spam call blocking API: cut spam costs and increase ARPU

Enterprise spam call blocking API and spam number feed for CPaaS, UCaaS, CCaaS, MVNOs, voice AI platforms and mobile security vendors. Drop spam before it burns AI tokens and minutes, or sell spam protection under your own brand.

Get an API key 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.

Increase ARPU on a paid tier

MVNOs, CPaaS, UCaaS and mobile security vendors sell spam protection under their own brand as a paid tier. You set the price. The license is a cost line that the tier pays back.

Stop paying to answer spam

Voice AI and CCaaS platforms run call screening before the agent picks up. Spam never reaches the model, so it burns no LLM tokens and no telephony minutes.

The reseller math

Example: your protection tier brings in $100,000 a month and the license costs $50,000 a month. You keep $50,000 a month. The license is priced against what the tier earns, not against a per-lookup rate card.

License $50,000

Your margin $50,000

Tier revenue: $100,000 a month

API or feed. Same data.

Every spam report from 195 countries, refreshed every minute. Check one number per call, or host the full list on your side.

Live spam score API

One GET per call returns a spam score from 0 to 100, the reputation and the complaints behind it. Drop, label or route the call while it sets up. See the live spam call blocking API.

Best for voice AI, CCaaS, CPaaS and UCaaS platforms that decide call by call.

0 to 100

spam score

1 GET

per call

GET /api/lookup/{phone} 200 OK

$ curl -H "X-Auth: YOUR_API_KEY" \
    https://callerapi.com/api/lookup/+18885550147

Spam phone number database feed

Every reported number from 195 countries, the last 15 days, hosted on your side. One flat fee, no per-lookup bill and no lookup on the call path. It runs beside your DNO list. See the spam phone number database feed.

Best for MVNOs, carriers and mobile security vendors that block at the switch or on the device.

60s

update cadence

Flat fee

for every use case

GET /api/spam-reports/csv 200 OK

$ head -4 spam_numbers.csv
+18882211161
+12099009302
+447476937994
+4930120849110

Call blocking SDK

Spam protection inside your own app in about 10 lines of code. Mobile security vendors and MVNOs sell it as a paid tier and lift ARPU. Lookups are anonymous on iOS and Android. See the call blocking SDK for your app.

Swift

Java / Kotlin CallerAPI Flutter SDK

Flutter

React Native CallerAPI Asterisk SDK

Asterisk

Scam detection on live calls

Listens to the caller and returns a scam score, the category and the tactics while the call is on. A scammer on a fresh number still has to say the script. See the voice firewall on live audio.

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 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 spam reports

15

days of rolling spam history

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.

Scope an integration

GoHighLevel

Aircall

Dialpad

Asterisk

Priced against what it earns you

Feed and volume API licenses are sized to your traffic and your resale plan. Self-serve plans let your team test the API today.

See all pricing tiers

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.

Get a volume quote

Spam phone number database, flat fee

The minute-fresh list for 195 countries, hosted on your side. One flat fee, no per-lookup charges, every use case included.

See the feed

Call blocking SDK license

Flat fee, or per subscriber per month with active call blocking. Sell protection as a paid tier under your brand and keep the margin.

See the SDK

Self-serve API plans

Basic

$25/mo

5,000 lookups per month
Spam score with complaint evidence
No-code integrations

Choose Basic

Premium

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.

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