The Community is hosting an End of Summer sweepstakes! Participants must complete tasks to earn tickets that will enter them with a chance to win a free year of Constant Contact and other great prizes!*
*No Purchase Necessary. For Official Rules, visit here. Constant Contact’s End of Summer 2020 Sweepstakes ends on October, 20, 2020 at 11:50 PM EST.

Maximum number of queries to the API?


Maximum number of queries to the API?

What is the maximum amount of inserts contacts in one list THROUGH THE API

Why I have to insert more than 100,000 users to this list.


Re: Maximum number of queries to the API?

There is no limit to the number of Contacts you can have on a single list in Constant Contact.  There are some limitations on the API for how many Contacts can be added in certain periods of time and through different methods.


Bulk API allows for up to 20,000 contacts in a single request.  These are batch jobs that are processed on our server after the request comes in.  They typically take a few minutes to process, with larger jobs taking longer.


The Contacts API, for doing single Contact add/updates, is limited to 200 create/update requests per second.  Since this is probably not the way you'd want to manage 100,000 Contacts, this limitation should not be a problem for you.  I would highly recommend the Bulk Activity API for your needs.

Dave Berard
Senior Product Manager, Constant Contact
Developer Portal

View API documentation, code samples, get your API key.

Visit Page

Constant Contact 2020 End of Summer Community Sweepstakes!

The Constant Contact User Community is hosting a sweepstakes. The more you participate, the more chances you have to win! Read on to learn more...

Read More