Constant Contact API
Constant Contact runs a fully self-serve V3 REST API with OAuth 2.0; any developer can register an app and any account holder can authorize it. The catch is the dual surface: some features still need the legacy V2 API, there is no bulk export, and strict token rotation trips long syncs.
Frequently asked questions
Constant Contact scores C on the API Report Card. Constant Contact runs a fully self-serve V3 REST API with OAuth 2.0; any developer can register an app and any account holder can authorize it. The catch is the dual surface: some features still need the legacy V2 API, there is no bulk export, and strict token rotation trips long syncs.
Constant Contact has an official API, but teams routinely hit its limits: gated access, partial coverage, or paid tiers. Most end up supplementing it with exports or an unofficial API layer like Supergood.
Constant Contact is a cloud-based digital marketing platform for small and medium-sized businesses that bundles email marketing, marketing automation, SMS marketing, event management, social media posting/ads, landing pages, signup forms, surveys, and a lightweight CRM into one product.
Vertical: Email marketing / digital marketing automation for SMB (horizontal SaaS, not industry-specific). A small business owner or office manager logs in to send a templated newsletter, event invite, or promotional email to imported contact lists; uses the drag-and-drop editor and ~600 templates; segments by tag, signup source, or open/click behavior; schedules send time; reviews opens/clicks/unsubscribes in the reporting dashboard.
Constant Contact reports serving roughly 500,000+ small business customers globally and is one of the three most recognizable SMB email brands alongside Mailchimp and Brevo.
Yes, for any business that runs marketing on it, Constant Contact is the system of record for the customer/prospect contact database (with custom fields, tags, segments, signup source, and consent state), every email and SMS send with opens/clicks/bounces/unsubscribes, automation entry/exit history, landing page and form submissions, event registrations and ticketing data, social posts and ad performance, and, for Lead Gen CRM / SharpSpring customers, leads, deals, pipeline activity, and behavioral site tracking.
Founded 1995 in Brookline, Massachusetts as 'Roving Software' by Randy Parker (one of the earliest commercial email service providers, predating Mailchimp by 6 years).
OAuth refresh token rotation is strict, tokens expire and require re-authorization more often than peers, breaking long-running unattended syncs. Rate limits are not generously documented and tighten under burst load; bulk contact sync jobs commonly throttle. Full sourced list under Sources below.
Common alternatives include Mailchimp (Intuit), HubSpot Marketing Hub, Brevo (Sendinblue), ActiveCampaign, Klaviyo, GetResponse. Graded alternatives appear under "More from the report card" below.
Grades measure one thing: can a customer's engineering team get their own data out programmatically? We check six things (whether a real API exists, how access is gated, data coverage, auth quality, docs and developer experience, and stability) and roll them into a letter grade. Grades get re-verified, and they only move on evidence.