FilterCalls API

Intent intelligence for every inbound call decision.

FilterCalls API helps teams move beyond binary spam lookup. Each request returns intent class, risk-trust scoring, nuisance severity, explainable signals, and recommended action so systems and humans can decide consistently.

Edge-compatible, low-latency architecture Action-ready responses for automation Built for B2B workflows, not consumer lookups

Why FilterCalls API

Intent-aware model: classify probable motive, not just "spam vs safe".

Hybrid intelligence: external metadata + internal scoring engine.

Explainable outputs: weighted signals and readable reasoning.

Designed for system automation and human decision support.

Developer request and response example

Request

POST /api/analyze
Content-Type: application/json

{
  "number": "+14155550142",
  "country": "US"
}

Response

{
  "input_number": "+14155550142",
  "formatted_number": "+1 (415) 555-0142",
  "country": "United States",
  "region": "California",
  "carrier": "Twilio Voice",
  "line_type": "voip",
  "is_valid": true,
  "risk_score": 81,
  "trust_score": 29,
  "nuisance_level": "critical",
  "probable_intent": "Spam / Robocall",
  "confidence": 89,
  "recommended_action": "Silence",
  "signals": [
    {
      "id": "commercial_routing_likelihood",
      "impact": "negative",
      "weight": 15,
      "detail": "Routing indicators align with scaled outbound behavior."
    },
    {
      "id": "regional_context",
      "impact": "positive",
      "weight": 11,
      "detail": "Provider metadata includes regional assignment (California)."
    }
  ],
  "explanation": "This number exhibits patterns consistent with commercial routing and anomaly signals...",
  "last_checked_at": "2026-04-18T08:02:33.329Z"
}

How teams integrate

1. Ingest call event

Forward number and optional country code from dialer, CRM, or telephony edge.

2. Score + classify intent

FilterCalls returns hybrid metadata + intent intelligence in one response payload.

3. Automate or assist

Use recommended actions to drive routing, escalation, suppression, or analyst review.

Customer support teams

Route likely service calls to priority queues while limiting nuisance traffic and repeat distractions.

Fraud prevention workflows

Escalate high-risk intent patterns for verification before agents disclose sensitive account details.

CRM enrichment and lead qualification

Attach trust, intent, and nuisance context to records so sales and success teams work with better contact intelligence.

Call routing and contact center operations

Use recommended actions and confidence to automate silence/voicemail/caution flows with policy consistency.

Dialer and telecom integrations

Embed pre-call intelligence into dialers, softphones, and SIP-based systems before human pickup.

Workflow orchestration

Trigger downstream workflows in fraud, support, analytics, or QA systems based on intent outcomes.

Response field reference

input_number

Original input submitted to the API. Useful for event tracing and audit context.

formatted_number

Normalized output format for display and downstream systems.

country

Country inference from numbering intelligence and provider metadata.

region

Regional location when metadata is available from provider sources.

carrier

Detected carrier/operator label used for trust context and operations.

line_type

mobile / landline / voip / unknown classification.

is_valid

Provider-backed validity indicator when available.

risk_score

0-100 risk estimate indicating harmful or nuisance likelihood.

trust_score

0-100 trust estimate indicating legitimacy confidence.

nuisance_level

Operational nuisance tier: low, medium, high, critical.

probable_intent

Most likely call-intent class (scam, spam, outreach, support, etc).

confidence

Model confidence score for this specific inference.

recommended_action

Action-ready output: block, silence, voicemail, caution, or answer.

signals

Explainable signal objects with impact, weight, and detail for transparency.

explanation

Human-readable reasoning summary for operators and analysts.

last_checked_at

Timestamp of latest analysis execution.

API access plans

Starter

$79/mo

25,000 requests / month

Email support within 2 business days

Ideal for: Internal tools, pilots, smaller ops teams

Request API access

Growth

$349/mo

250,000 requests / month

Priority support and solution guidance

Ideal for: Support operations, CRM enrichment, mid-market teams

Talk to sales

Business

$1,250/mo

1.5M requests / month

Slack channel + faster SLA-backed support

Ideal for: Contact centers, fraud teams, multi-product platforms

Talk to sales

Enterprise

Custom

High-scale + burst workloads

Dedicated engineering + architecture review

Ideal for: Telecom, platform APIs, regulated environments

Join enterprise waitlist

Ready to operationalize call intent intelligence?

Bring FilterCalls into your support, fraud, CRM, or routing stack with a simple API integration.

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