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SPECIFICTION
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Abstract Email Validation API

abstractapi.com

From $17/mo WebAPI
Visit abstractapi.com
Spec score 7.8 #13 of 31 in Email Verification APIs

What it is

Abstract Email Validation API checks whether submitted email addresses are correctly formed and can receive mail. One call checks address format, domain MX records, live SMTP without sending a message, and disposable or catch-all addresses. Responses arrive as structured JSON with deliverability, a quality score, SMTP status, and MX validation. The API supports signup form cleanup, B2B lead verification, and efforts to reduce bounce rates without tying a developer to one email provider. The product page says real-time validation responses arrive in under 300ms, and the API also supports bulk checks. CSV upload is included with listed paid plans. The Free plan includes 100 requests at three requests per second. Starter is $17 a month, billed annually, with 60,000 requests per year, three requests per second, domain whitelisting, and bulk CSV upload. The listed integrations include HubSpot, AWS, Salesforce, Zapier, Snowflake, Shopify, Make, Mailchimp, and Azure. The product page lists a 99.99% uptime SLA and describes privacy protections and compliance resources.

Spec sheet

Purpose
The API checks whether an email address is real and can receive mail when a user submits it.Read 28 Sep 2026 · abstractapi.com
Audience
Abstract says its products serve teams in over 100 countries, from startups and side projects to public companies and critical infrastructure.Read 28 Sep 2026 · abstractapi.com
Integrations
The maker lists integrations including HubSpot, AWS, Salesforce, Zapier, Snowflake, Shopify, Make, Mailchimp, and Azure.Read 28 Sep 2026 · abstractapi.com
Support
The product page says questions are usually answered by a real person within a few hours via email or [email protected].Read 28 Sep 2026 · abstractapi.com
Bulk validation
The API supports bulk email validation and CSV upload is included on paid plans listed on the page.Read 28 Sep 2026 · abstractapi.com
Privacy and compliance
The product page describes the service as GDPR and CCPA privacy friendly and states SOC 2 Type II and GDPR readiness.Read 28 Sep 2026 · abstractapi.com
Rate limit
The Free plan includes 100 requests and allows 3 requests per second.Read 28 Sep 2026 · abstractapi.com
Response
The API returns structured JSON with deliverability, quality score, SMTP check, and MX validation.Read 28 Sep 2026 · abstractapi.com
Signup and lead use
Abstract says developers use the API to reduce bounce rates, clean signup forms, and verify B2B leads without being locked to an email provider.Read 28 Sep 2026 · abstractapi.com
Speed
The product page says a full validation response for real-time signup flows is returned in under 300ms.Read 28 Sep 2026 · abstractapi.com
Uptime
The product page lists a 99.99% uptime SLA.Read 28 Sep 2026 · abstractapi.com
Validation checks
One call checks address format, domain MX records, live SMTP without sending a message, and disposable or catch-all addresses.Read 28 Sep 2026 · abstractapi.com

Plans and prices

Starter $17 a month Paid annually · $17 / month 60,000 requests / year · 3 requests / second · Domain whitelisting · Bulk CSV upload Read 28 Sep 2026 · abstractapi.com
Standard $37 a month Paid annually · $37 / month 60,000 requests / year · 3 requests / second · Domain whitelisting · Bulk CSV upload Read 28 Sep 2026 · abstractapi.com
Professional $39 a month Paid annually · $39 / month 60,000 requests / year · 3 requests / second · Domain whitelisting · Bulk CSV upload Read 28 Sep 2026 · abstractapi.com
Enterprise Priced on request Contact sales Flexible requests / month · Flexible requests / second · Domain whitelisting · Bulk CSV upload · Commercial license · SOC 2 & GDPR · Enhanced SLA & support · Dedicated account manager Read 28 Sep 2026 · abstractapi.com
Free Price not published $0 / month 100 requests · 3 requests / second Read 28 Sep 2026 · abstractapi.com

Every Abstract Email Validation API plan and price →

Strong points and limits

Strong points

  • Checks format, MX records, SMTP, disposable, and catch-all addresses.
  • Returns structured JSON with deliverability and quality details.
  • Supports real-time and bulk validation.
  • Free plan includes 100 requests at three per second.
  • Listed uptime SLA is 99.99%.

Limits

  • Free plan is limited to 100 requests.
  • Starter costs $17 a month billed annually.
  • CSV upload is included on paid plans.

Who it suits

It suits developers adding email checks to signup flows or lead workflows, and teams that need bulk validation. The free tier may suit low-volume use, while paid plans include CSV upload.

Verdict

The API combines mailbox-related checks with structured responses and bulk validation. Its free request allowance is small, and the listed paid Starter plan requires annual billing.

Where Specifiction places it

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