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Abstract API

Vendor: Abstract API

Developer API suite for email, phone, and IP verification plus company enrichment to clean lists and block fraud.

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email linkedin Revenue teams cleaning lists before outbound campaigns Developers integrating verification APIs into products #email-verification #api-integration #fraud-detection

Overview

Abstract API provides a library of single-purpose REST APIs for email validation, email reputation, phone validation, company enrichment, and IP intelligence geolocation. Revenue teams use the email validation API to check syntax, MX records, live SMTP, disposable and catch-all domains, role addresses, and typos, receiving a quality score in under 300 milliseconds. The platform also offers phone number verification, firmographic company enrichment from any domain, and IP geolocation with risk signals such as VPN, proxy, and abuse history. Each API operates on a per-product subscription model with individual free tiers and keys, and the service integrates with major CRM and cloud platforms. Abstract states processing over 3 billion validations, holding SOC 2 Type II certification and GDPR readiness, and offering a 99.99% uptime SLA on enterprise plans. Pricing is separate per API, with free tiers available and a 10% discount for annual billing.

Key Features

Email Validation

Combines syntax, MX, live SMTP, disposable, catch-all, role, and typo checks with a quality score in a single REST call.

Email Reputation

Returns sender, domain risk details including domain age, DMARC and SPF status, spam trap and toxic domain flags, and known breach history.

Phone Validation

Verifies phone numbers and flags invalid, VoIP, and disposable lines to improve calling list contact rates.

Company Enrichment

Returns firmographic data such as headcount, location, and industry from any domain or email address.

IP Intelligence and Geolocation

Geolocates any IP and surfaces risk signals including VPN, proxy, and abuse history for routing and fraud checks.

Pros & Strengths

  • ✓
    Fast Integration: Single REST call returns structured JSON; dashboard testing and code samples enable quick production deployment.
  • ✓
    Depth in One Response: Deliverability, quality score, sender and domain details, risk status, and breach history all return together, reducing multiple lookups.
  • ✓
    Free Tier on Every API: Each product includes a no-card allowance, allowing teams to benchmark accuracy against their own data before paying.
  • ✓
    Enterprise Compliance: SOC 2 Type II, GDPR readiness, SSO and SAML login, and a 99.99% uptime SLA support regulated environment use.

Cons & Tradeoffs

  • ⚠
    Separate Subscription Per API: Products are keyed and billed independently, so teams needing multiple capabilities carry several monthly subscriptions.
  • ⚠
    Throughput Limits on Standard Plans: Published tiers list three requests per second, which can slow bulk verification of large lists without careful batching.
  • ⚠
    Catch-All Domains Unresolved: Addresses on catch-all domains are flagged rather than judged, leaving the final validation call to the user.

Known Limitations

  • • Separate Subscription Per API: Products are keyed and billed independently, requiring multiple subscriptions for full capability.
  • • Throughput Limits on Standard Plans: Published tiers list three requests per second, slowing bulk verification without careful batching.
  • • Catch-All Domains Stay Unresolved: Addresses on catch-all domains are flagged rather than judged, leaving the final call to the user.

Pricing & Plans

Model: subscription

Email Validation API priced from $0 (Free: 100 requests) to Enterprise (custom pricing). Starter from $17/month for 5,000 requests. Standard from $37/month, Professional from $39/month. Other APIs (Phone, Company Enrichment, IP Intelligence) have separate plans. 10% discount for annual billing. Free tier per product with no credit card required.

✓ Free Plan ✓ Free Trial

Editorial Info

Last Reviewed: 2026-08-20

Verified Sources & Research

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