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What is AbstractAPI Email Validation?
Abstract API Email Validation is a developer-first REST API that verifies email deliverability in one JSON response—format, MX records, SMTP handshake, and disposable/catch-all signals. It is designed for signup forms, CRM hygiene, and bulk CSV jobs without tying you to an ESP.
Key features
Four-in-One Checks
Single call returns format validity, MX discovery, live SMTP check, and disposable/catch-all flags.
Quality & Risk Scoring
Quality score and extended fields (sender, domain, breach, risk) on higher tiers.
Typo Suggestions
Smart suggestions for common domain typos to recover signups.
Bulk CSV Upload
Starter tier and above support bulk validation via dashboard CSV in addition to API.
Free Tier
100 requests with no credit card; 3 requests/second on free plan.
Compliance & Uptime
Markets SOC 2 Type II readiness, GDPR, and 99.99% uptime SLA on enterprise tier.
Multi-Key Management
Multiple API keys and test environments for staging vs. production.
Expanded Intelligence
Professional tier adds breach check, DMARC/SPF context, domain age, toxic domain, and role detection in one response.
AbstractAPI Email Validation pricing
Annual API pricing shown on the product page (also monthly equivalents for Standard+). Free: 100 total requests. Starter $17/mo ($204/year): 5,000 requests/mo, deliverability only. Standard $37/mo: adds sender/domain enrichment. Professional $39/mo: full risk/breach/quality stack at same 5,000/mo allowance. Enterprise: custom volume, enhanced SLA, dedicated manager. Compare table cites ~$17/mo for 5,000 verifications vs. higher competitor packs.
| Plan | Price | What's included |
|---|---|---|
| Free | $0 | 100 requests lifetime on free tier; 3 req/sec; core deliverability fields |
| Starter | $17/month ($204/year) | 5,000 requests/month; email deliverability; bulk CSV; domain whitelisting |
| Standard | $37/month | 5,000 requests/month; deliverability plus sender and domain enrichment |
| Professional | $39/month | 5,000 requests/month; deliverability, sender, domain, quality, risk, and breach fields |
| Enterprise | Custom | Flexible requests/sec and monthly volume; SOC 2/GDPR; enhanced SLA; commercial license |
Pros & cons
Pros
- + All-in-one JSON response reduces orchestration code
- + Rich risk/breach fields on Professional vs. basic verifiers
- + 100 free requests without a card
- + Part of Abstract's multi-API suite (phone, company, etc.)
- + Transparent comparison vs. ZeroBounce/Kickbox on same page
- + Sub-50ms SMTP checks claimed for production tier
- + Bulk and real-time on same API keys
Cons
- − Low monthly quotas on paid tiers (5,000/mo) vs. credit-pack verifiers at similar price
- − Annual-first pricing can obscure monthly cash flow
- − Not a full list-hygiene UI for marketers—developer-centric
- − Enterprise required for highest throughput and SLA
- − Overage pricing not prominent on marketing page
- − Less ESP-native integration depth than specialist verification brands
Who is AbstractAPI Email Validation best for?
- • Engineers adding signup validation to web or mobile apps
- • Startups already using Abstract for other enrichment APIs
- • Teams wanting breach and risk signals with verification
- • Low-to-mid volume SaaS forms (<5K checks/month)
- • Products needing bulk CSV plus API on one vendor
Frequently asked questions
How many free requests do I get?
Abstract offers 100 email validation requests on the free tier with no credit card required.
What is included on Professional vs. Starter?
Starter covers deliverability checks. Professional adds quality score, risk assessment, breach data, and related fields at the same monthly request allowance.
Can I verify in bulk?
Yes—paid plans include bulk CSV upload alongside the REST API.
