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- SH203 operations26 revisionsshipmail API@shipmail/shipmail-api
Email: send messages, manage mailboxes, domains, audiences and calendar bookings
- BE307 operations22 revisionsBear@bear/bear
Accounting firm workspace: companies, staff, ticket boards, chat links, rules and handbook for agents
- PI280 operations92 revisionsPipeline Backend@transload/pipeline-backend
Warehouse scanning: ingest video, track handling units, and retrieve measurements and QA results
- RO1,214 operations138 revisionsRoost v2 / Pigeonly Company OS@pigeonly/roost-v2-pigeonly-company-os
Company operations: finance, sales, support, fulfillment, print, manufacturing and bookings in one platform API
- FE153 operations29 revisionsfettle.sh@fettle/fettle-sh
Uptime monitoring: create monitors, heartbeats, incidents, status pages and maintenance windows
- AP268 operations42 revisionsAPI Explorer@instantly/api-explorer
Cold email outreach: manage campaigns, sender accounts, leads, emails and deliverability tests
- ME708 operations216 revisionsMetricool API@metricool/metricool-api
Social media analytics, scheduling and reporting: publish posts, track account metrics and manage brands and reports
- ME402 operations31 revisionsMet Public API@meteor/met-public-api
Agentes IA: ejecuta Mets, gestiona colecciones, tareas, aprobaciones e integraciones
- AT67 operations519 revisionsAtlas API@atlas/atlas-api
Customer support: manage conversations, customers, help center articles, CSAT surveys and session recordings
- OR46 operations72 revisionsOrchestrator API@clouditor/orchestrator-api
Cloud compliance orchestration: register assessment tools, manage catalogs, controls, metrics and certificates
- TH60 operations100 revisionsTheirStack API Reference@theirstack/theirstack-api-reference
Jobs and companies: search job postings and technographics, find decision makers, manage saved searches and webhooks
- IS17 operations5 revisionsIsometric API@isometric/isometric-api
Auth, GraphQL, Stripe and Xero webhooks, health probes and OAuth metadata for an internal service backend
- ME165 operations57 revisionsMetronome@metronome/metronome
Usage billing: manage customers, contracts, invoices, credits, billable metrics and usage events
- EX35 operations27 revisionsExperiential Labs Platform API@experientiallabs/experiential-labs-platform-api
AI model gateway: chat, embeddings, images, audio, video, batches and files via OpenAI- and Anthropic-style endpoints
- MI68 operations10 revisionsMind Upload Partner API@mindupload/mind-upload-partner-api
Partner API: build AI consciousness clones, memories, voice interviews, chatrooms and live calls
- PI14 operations159 revisionsPipelines@hubspot/crm-pipelines
CRM: configure sales and support workflow stages for deals and tickets, with change history
- SI25 operations62 revisionsSimple API@simpledotorg/simple-api
Health records: sync patients, blood sugar, medications and questionnaires, plus facility reports and teleconsultations
- NI143 operations62 revisionsNixopus API@nixopus/nixopus-api
Self-hosted deployment platform: deploy apps, manage containers, machines, domains and health checks
- CR1 operation126 revisionsCRM App Uninstalls@hubspot/crm-app-uninstalls
CRM: uninstall HubSpot app integrations and remove their installation records
- CE1,285 operations40 revisionsCernion Energy Tools API@cernion/cernion-energy-tools-api
Energy: grid operator KPIs, market prices, datasets, forecasts and asset data via REST API
- MY120 operations12 revisionsMyTime Partners API@mytime/mytime-partners-api
Scheduling and enrollment: manage clients, classes, appointments, locations and bookings
- OR68 operations4 revisionsOrchestra API@getorchestra/orchestra-api
Workflow orchestration: query pipeline and task runs, manage pipelines, assets, logs and artifacts
- OR15 operations12 revisionsOriginalVoices API@originalvoices/originalvoices-api
Audience research: manage audiences and synthetic twins, ask open or choice questions, review studies
- AP1,378 operations27 revisionsAPIbase — Universal API Hub for AI Agents@apibase/apibase-universal-api-hub-for-ai-agents
Aggregated APIs for AI agents: flights, prediction markets, crypto prices, weather and trading
Showing 1 to 24 of 16,390
Load more