Python

Python

Verify one address or a whole list with requests, including retries and 429 handling.

Node.js

Node.js

Verify one address or a whole list with built-in fetch. No packages needed.

PHP

PHP

Verify one address or a whole list from PHP with cURL or Guzzle.

Ruby

Ruby

Verify one address or a whole list with Net::HTTP and no gems.

Go

Go

Verify one address or a whole list with net/http and typed structs.

Java

Java

Verify one address or a whole list with java.net.http and Jackson.

C#

C#

Verify one address or a whole list with HttpClient and System.Text.Json.

Bulk

Verify a list with the API

Submit up to 100,000 addresses, poll, fetch results as JSON or CSV, then delete.

Webhooks

Webhooks and callbacks

Get a signed list.done call when a list finishes, with verification code for Python, Node.js and PHP.

Errors

Errors, credits and rate limits

Status codes 400 to 429, how credits are charged and refunded, and how to handle 202 pending safely.