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Abstract Email Validation API
What it is
Abstract Email Validation API checks whether an email address is real and able to receive mail when submitted. A single API call checks the address format, domain MX records, live SMTP without sending a message, and disposable or catch-all addresses. It returns structured JSON containing deliverability, a quality score, SMTP check, and MX validation. The service is intended for signup form cleanup, B2B lead verification, and reducing bounce rates without tying developers to one email provider. Abstract says a full response for real-time signup flows arrives in under 300ms. Bulk validation is supported, and paid plans listed on the page include CSV upload. The API is available on API and web platforms, with integrations including HubSpot, AWS, Salesforce, Zapier, Snowflake, Shopify, Make, Mailchimp, and Azure. The Free plan provides 100 requests at three requests per second. Paid plans start at $17.00 per month billed annually; Starter includes 60,000 requests per year, domain whitelisting, and bulk CSV upload. The product page lists a 99.99% uptime SLA and describes privacy and compliance provisions.
For and against
For
- Checks format, MX records, and live SMTP.
- Flags disposable and catch-all addresses.
- Returns structured JSON validation results.
- Supports bulk validation and paid-plan CSV uploads.
- Free plan allows three requests per second.
Against
- Free plan includes only 100 requests.
- Paid plans are billed annually.
- Free plan does not list CSV upload.
The verdict
Abstract Email Validation API combines multiple email checks in one response and supports real-time and bulk workflows. The free allowance is 100 requests; paid plans start at $17.00 per month billed annually.
Who it suits
The API suits developers validating addresses in signup flows, cleaning lead lists, or checking B2B contacts. It offers both real-time and bulk validation, with CSV upload on listed paid plans.
Plans and prices
Starter
60,000 requests / year · 3 requests / second · Domain whitelisting · Bulk CSV upload
Read 28 Sep 2026 · abstractapi.com
Standard
60,000 requests / year · 3 requests / second · Domain whitelisting · Bulk CSV upload
Read 28 Sep 2026 · abstractapi.com
Professional
60,000 requests / year · 3 requests / second · Domain whitelisting · Bulk CSV upload
Read 28 Sep 2026 · abstractapi.com
Enterprise
Flexible requests / month · Flexible requests / second · Domain whitelisting · Bulk CSV upload
Read 28 Sep 2026 · abstractapi.com
Free
100 requests · 3 requests / second
Read 28 Sep 2026 · abstractapi.com
On the record
- Audience
- Abstract says its products serve teams in over 100 countries, from startups and side projects to public companies and critical infrastructure.abstractapi.com · read 28 Sep 2026
- Bulk validation
- The API supports bulk email validation and CSV upload is included on paid plans listed on the page.abstractapi.com · read 28 Sep 2026
- Integrations
- The maker lists integrations including HubSpot, AWS, Salesforce, Zapier, Snowflake, Shopify, Make, Mailchimp, and Azure.abstractapi.com · read 28 Sep 2026
- Privacy and compliance
- The product page describes the service as GDPR and CCPA privacy friendly and states SOC 2 Type II and GDPR readiness.abstractapi.com · read 28 Sep 2026
- Purpose
- The API checks whether an email address is real and can receive mail when a user submits it.abstractapi.com · read 28 Sep 2026
- Rate limit
- The Free plan includes 100 requests and allows 3 requests per second.abstractapi.com · read 28 Sep 2026
- Response
- The API returns structured JSON with deliverability, quality score, SMTP check, and MX validation.abstractapi.com · read 28 Sep 2026
- 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.abstractapi.com · read 28 Sep 2026
- Speed
- The product page says a full validation response for real-time signup flows is returned in under 300ms.abstractapi.com · read 28 Sep 2026
- Support
- The product page says questions are usually answered by a real person within a few hours via email or [email protected].abstractapi.com · read 28 Sep 2026
- Uptime
- The product page lists a 99.99% uptime SLA.abstractapi.com · read 28 Sep 2026
- Validation checks
- One call checks address format, domain MX records, live SMTP without sending a message, and disposable or catch-all addresses.abstractapi.com · read 28 Sep 2026
