mailboxlayer API vs. Lead411

Mailboxlayer is a free, simple and powerful JSON API offering instant email address validation & verification via syntax checks, typo and spelling checks, SMTP checks, free and disposable provider filtering, and much more. Its system is REST-based, secured by 256-bit HTTPS encryption, and pursuing the goal of assisting developers and businesses in fighting fraudulent users and increasing success rates of email campaigns.

Lead411 is an Unlimited data provider that has the most comprehensive and accurate information about contacts and companies available in the marketplace. We currently have over 450M contacts, within 20M companies worldwide. Through targeted filters, and Growth Intent Data, and direct customer outreach with the built-in email tool Reach, customers are able to view complete contact data profiles and find growing companies that are more likely to be in a buying cycle for adding services/solutions. Ask about Unlimited Data!