Explore APIs
17,352 OpenAPI descriptions. Read the docs, compare revisions or generate a client.
Collections
New this month
6,279 APIs added in the last 30 days.
The biggest APIs
The APIs with the most operations.
Most active
Most new revisions in the last 90 days.
All APIs
17,352- EM17 operations1,024 revisionsEmails@hubspot/crm-emails
CRM activity: log, search, update and link email conversations to contacts and deals
- CU13 operations1,179 revisionsCustom Objects@hubspot/crm-custom-objects
CRM: create, read, update, search and merge custom object records
- RE181 operations588 revisionsRefly AI@refly-ai/refly-ai
- PA6 operations1,154 revisionsPartner Services@hubspot/crm-partner-services
CRM: read, search, batch-update and edit HubSpot partner service records
- DI17 operations1,056 revisionsDiscounts@hubspot/crm-discounts
CRM: manage discount records, search, batch updates, merges and associations with deals
- SK106 operations155 revisionsSkyvern API@skyvern-ai/skyvern-api-2
Browser automation: run AI agents and tasks, manage runs, credentials, browser sessions and profiles
- HE353 operations204 revisionsHephaestus API@hephaestus-build/hephaestus-api
Developer practice reviews, feedback, standings and LLM spend tracking for engineering workspaces
- OT420 operations429 revisionsotari@mozilla-ai/otari
AI gateway: route OpenAI-compatible chat and audio calls, manage API keys, budgets, and usage tracing
- AU18 operations281 revisionsAutomation Actions V4@hubspot/automation-actions-v4
CRM workflows: create, update and delete custom actions, their functions and revisions
- MA449 operations72 revisionsMain Frontend API@rage/rage
Courses: create courses, chapters and pages, manage certificates, glossaries, exams and student credit registrations
- LI14 operations1,049 revisionsLine Items@hubspot/crm-line-items
CRM: create, read, update, search and archive products attached to deals and quotes
- RA7 operations34 revisionsRacksDB REST API@rackslab/racksdb-rest-api
Data centers: query racks, nodes, infrastructures and tags, and render drawings
- SE17 operations1,085 revisionsServices@hubspot/crm-services
CRM records: create, read, search, batch-update and merge contacts, deals and other objects, with associations
- CR17 operations980 revisionsCRM Postal Mail@hubspot/crm-postal-mail
CRM: create, search, update and archive postal mail records and their associations
- CO17 operations1,092 revisionsCourses@hubspot/crm-courses
CRM: manage course records with search, batch updates, associations and GDPR deletion
- CM8 operations339 revisionsCMS Source Code@hubspot/cms-source-code
HubSpot CMS source: create, read, update, delete and validate project files, and extract zip archives
- AP205 operations219 revisionsAPI Référentiel Applications@dnum-mi/api-referentiel-applications
Application catalog: manage applications, their hosting, actors, compliance and technical debt
- AS10 operations1,097 revisionsAssociations@hubspot/crm-associations
CRM: link, label, read and remove relationships between records
- ZE1,271 operations259 revisionsZernio API@zernio/zernio-api
Social, messaging and commerce: publish posts, run ads, manage inboxes, SMS, WhatsApp and blogs
- CO17 operations1,103 revisionsCompanies@hubspot/crm-companies
CRM: manage company records, search them, merge duplicates and link them to other objects
- LO61 operations646 revisionsLogistics API@vtex/logistics-api
Inventory, warehouses, pickup points, shipping rates and delivery windows for order fulfillment
- ES211 operations481 revisionsES API@equipmentshare/es-api
Equipment rental: manage orders, deliveries, assets, credit applications and rental KPIs
- PO2,702 operations187 revisionsPostHog API@posthog/posthog-api
Product analytics: query events, manage feature flags, experiments, dashboards, surveys and error tracking
- PR44 operations578 revisionsProxy Manager@brightdata/proxy-manager
Proxy servers: create and manage proxy ports, IP bans, whitelists, zones and sessions
Showing 1 to 24 of 17,352
Load more