Copper API
Copper offers a self-serve REST JSON API with API key or OAuth 2.0 auth across the full CRM object graph, plus webhooks. Ceilings are modest: 180 requests per minute, 3 per second on bulk endpoints, and 100 webhook subscriptions, so large syncs need careful queueing and backoff.
Frequently asked questions
Copper scores C on the API Report Card. Copper offers a self-serve REST JSON API with API key or OAuth 2.0 auth across the full CRM object graph, plus webhooks. Ceilings are modest: 180 requests per minute, 3 per second on bulk endpoints, and 100 webhook subscriptions, so large syncs need careful queueing and backoff.
Copper 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.
Copper is a customer relationship management platform engineered to run entirely inside Google Workspace (Gmail, Calendar, Drive, Contacts, Sheets, Meet).
Vertical: horizontal Sales CRM with a Google Workspace bias, sold into SMB service businesses. Sales reps work primarily from the Gmail sidebar via Copper's Chrome extension, auto-capturing new contacts on first email, pulling deal/company/opportunity context into the inbox, logging calls and meetings against the right records, and triggering tasks/workflows from email threads.
Copper serves 30,000+ paying companies worldwide, reached ~$47M in annual revenue, employs roughly 90-150 staff out of San Francisco, and is consistently ranked in the top 10 SMB CRMs by Gartner, G2, and Capterra (4.5/5 on G2 across 1,150+ reviews, 4.4/5 on Capterra across 620+ reviews, 4.3/5 on Trustpilot across 320+ reviews).
Yes, for 30,000+ SMB service businesses, Copper is the system of record for the sales-and-delivery pipeline that sits on top of Google Workspace.
Founded 2011-2013 in San Francisco by Jon Lee and Kelly Cheng under the original name ProsperWorks, positioned from day one as 'the CRM built for G Suite.' Series A 2014, Series B October 2016 ($24M led by Norwest Venture Partners with True Ventures and Industry Ventures participating), Series C August 2017 ($53M led by Norwest with GV / Google Ventures, True Ventures, Storm Ventures, Industry Ventures), bringing total raised to ~$87M and making it the #1 funded CRM company founded in the prior decade at the time.
General API requests are capped at 180 requests per minute on a rolling window with a 429 thrown on overage, modest ceiling that bottlenecks bulk sync jobs against large Copper accounts. Bulk API endpoints are throttled even more aggressively at 3 requests per second, requiring careful queueing/backoff for any data migration or full-account sync. Full sourced list under Sources below.
Common alternatives include HubSpot CRM, Salesforce Sales Cloud, Pipedrive, Zoho CRM, Freshworks Freshsales, Monday Sales CRM. 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.