Explore APIs
16,390 OpenAPI descriptions. Read the docs, compare revisions or generate a client.
Collections
New this month
6,967 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
16,390- AG186 operations49 revisionsAgentZ HTTP API@accuknox/agentz-http-api
AI agent platform: manage agents, workflows, dashboards, secrets, sandboxes and inference providers
- SY201 operations308 revisionsSyllableSDK@asksyllable/syllablesdk
AI agents: configure conversational agents, channels, conversations, prompts and tools for voice and SMS
- CH100 operations125 revisionsChariot API@chariot-giving/chariot-api-5
Charitable giving: open donor accounts and donor advised funds, send donations and grants to nonprofits
- VO108 operations213 revisionsVoucherify API - Loyalty v2@voucherifyio/voucherify-loyalty-v2-api
Loyalty: manage programs, tiers, earning rules, rewards, benefits and card definitions
- AG472 operations552 revisionsAgent Swarm API@desplega-ai/agent-swarm-api
Multi-agent orchestration: distribute tasks, route agent messages, discover services across coding agents
- AP12 operations40 revisionsApp Management API@adobe/app-management-api
Commerce app management: install, upgrade and uninstall apps, edit configuration and scope trees
- OP140 operations189 revisionsOpenMeter API@openmeterio/openmeter-api
Usage metering and billing: ingest events, manage customers, subscriptions, invoices and entitlements
- LE64 operations120 revisionsLedger v3 API@formancehq/ledger-api
Ledgers: record transactions, manage accounts, balances, numscripts and audit logs
- SC320 operations363 revisionsSchematic API@schematichq/schematic-api
Feature flags, plans, billing and usage events: manage companies, entitlements, credits and checkout
- BL9 operations121 revisionsBlog Settings@hubspot/cms-blog-settings
CMS: manage blog revisions, language variations and multi-language groups
- GO126 operations106 revisionsGoModel API@enterpilot/gomodel-api
AI gateway: route chat, embeddings, images, audio and batches across LLM providers
- TR6 operations172 revisionsTransactional Single Send@hubspot/marketing-transactional-single-send
Email: send single transactional emails and manage SMTP API tokens and passwords
- ST209 operations590 revisionsStream API@getstream/stream-api
Chat: channels, messages, members, moderation blocklists and campaigns
- CR30 operations121 revisionsCRM Lists@hubspot/crm-lists
Lists: create and manage CRM record lists, folders, memberships and ID mappings
- CL263 operations302 revisionsClerk Backend API@clerk/clerk-backend-api
Authentication: manage users, organizations, sessions, invitations and sign-in tokens for your app
- CO17 operations210 revisionsCourses@hubspot/crm-courses
CRM: manage course records with search, batch updates, associations and GDPR deletion
- WA72 operations65 revisionsWasp API@iotaledger/wasp-api
Chains: query chain state and account balances, post requests, manage nodes and users
- CA20 operations77 revisionsCatalog Data Ingestion API@adobe/catalog-data-ingestion-api
Catalog data: manage products, categories, price books, prices and product layers
- UR4 operations148 revisionsUrl Mappings@hubspot/cms-url-mappings
HubSpot links: list, create, retrieve and delete redirect rules for site URLs
- EM17 operations220 revisionsEmails@hubspot/crm-emails
CRM activity: log, search, update and link email conversations to contacts and deals
- ES16 operations71 revisionsESP-Miner API@bitaxeorg/esp-miner-api
Mining devices: read system info and stats, scan WiFi, control mining, and update firmware
- SI1 operation160 revisionsSingle-send@hubspot/marketing-single-send
Marketing email: send single transactional or marketing emails to individual contacts
- AC2 operations178 revisionsAccount Account Info@hubspot/account-account-info
HubSpot: retrieve account details and daily private app API usage metrics
- US14 operations233 revisionsUsers@hubspot/crm-users
CRM: manage user records with batch create, read, update, archive and search, plus associations
Showing 1 to 24 of 16,390
Load more