https://dev.to/ismail_shahzad_5e056c5e53/how-i-built-a-crypto-address-validation-api-832
How I Built a Crypto Address Validation API - DEV Community
address validation apibuilt
https://www.mailboxvalidator.com/
Email Validation API - Verify Email Address | MailboxValidator
MailboxValidator email validation clean email lists and reduces bounce. It connects to the mail server and checks whether the mailbox exists or not.
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https://check-mail.org/
Free email address validation API service, block disposable email
Check-Mail is a free API service to validate email addresses, to check if an email is valid or disposable. The API combines blacklists with advanced heuristics...
email address validationfree