HubSpot API
HubSpot exposes a broad v3 REST API plus a CRM GraphQL API at developers.hubspot.com, spanning CRM objects, engagements, marketing, CMS, and webhooks. Any portal admin can mint a private app token without approval. Burst limits of 110 to 190 requests per 10 seconds are the main constraint.
Frequently asked questions
HubSpot scores A on the API Report Card. HubSpot exposes a broad v3 REST API plus a CRM GraphQL API at developers.hubspot.com, spanning CRM objects, engagements, marketing, CMS, and webhooks. Any portal admin can mint a private app token without approval. Burst limits of 110 to 190 requests per 10 seconds are the main constraint.
HubSpot has a workable official integration path. Most engineering teams can build against it directly. Open API: self-serve, documented, with SDKs
HubSpot is a cloud customer platform that unifies CRM, marketing automation, sales engagement, customer service, content management, and commerce/billing into a single Smart CRM foundation.
Vertical: CRM / marketing automation / sales / service (horizontal SaaS, not industry-specific). Marketing teams build landing pages, blogs, and email/SMS campaigns; segment contacts with lists; run lifecycle automations via Workflows; and attribute revenue with Marketing Hub reporting.
HubSpot finished 2025 with 288,706 paying customers across 135+ countries, generated $3.13B in 2025 revenue (up 19% YoY), and is adding 9,000-10,000 net new customers per quarter on 2026 guidance.
Yes, for nearly 300,000 businesses, HubSpot is the system of record for the entire go-to-market dataset: the master contact and company database with custom properties and lifecycle stages, the deal pipeline and revenue forecast, every email/SMS/WhatsApp/call/meeting engagement with timestamps and content, marketing automation enrollment history, lead scoring and attribution, form submissions and landing page conversions, ticket/conversation history across all support channels, knowledge base content, CMS-managed websites and blogs, quotes/invoices/payments via Commerce Hub, consent and subscription preferences (subject to GDPR/CAN-SPAM/CCPA/CASL), and, for Breeze users, AI agent decision audit logs.
Founded June 2006 in Cambridge, MA by Brian Halligan and Dharmesh Shah to commercialize 'inbound marketing.' IPO on NYSE October 2014 at $25/share raising $140M+ (ticker HUBS).
Rate limits cap apps at 110 requests/10s (Free/Starter) up to 190 requests/10s (Pro/Enterprise) per portal, high-volume sync jobs hit ceilings quickly and require backoff/queueing infrastructure. CRM Search API was historically capped at 1 request/second and only recently raised to 4 requests/second, still painfully low for any multi-object lookup workload. Full sourced list under Sources below.
Common alternatives include Salesforce (Sales Cloud / Marketing Cloud / Service Cloud), Microsoft Dynamics 365, Zoho CRM / Zoho One, Adobe Marketo Engage, ActiveCampaign, Pipedrive. 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.