API Features
Browse the network by technical capability — authentication methods, protocols, delivery
mechanisms, deployment models, compliance certifications, and agent-native surfaces.
Providers describe features as free text in apis.yml — nearly 14,900 distinct
strings — so APIs.io maps them onto a canonical vocabulary. Each feature below lists every
provider that offers it, ranked by API Evangelist rating.
Webhooks
Outbound HTTP callbacks pushed on events.
REST API
Resource-oriented HTTP API over standard verbs.
Client SDKs
Official libraries in multiple languages.
OAuth 2.0
Delegated authorization via OAuth 2.0 flows.
Server-Sent Events & Streaming Responses
Incrementally streamed HTTP responses.
Open Source
Source code published under an open license.
Workflow Automation
Multi-step, event-triggered orchestration.
MCP Server
Model Context Protocol server for AI agents.
Observability & Monitoring
Metrics, traces, and logs for API usage.
Bearer Tokens & JWT
Signed bearer tokens and JWTs for stateless authentication.
Self-Hosting
Run the software in your own infrastructure.
Single Sign-On
Enterprise SSO via SAML or OIDC identity providers.
API Key Authentication
Simple key-based authentication for server-to-server calls.
Rate Limiting
Documented request quotas and throttling behavior.
Multi-Tenancy
Isolated tenants, workspaces, or organizations.
Containers & Kubernetes
Container images and Kubernetes-native deployment.
OpenAPI Specification
A machine-readable OpenAPI/Swagger contract.
Role-Based Access Control
Roles and permissions governing who can call what.
Sandbox Environment
A safe test environment with fake data.
Audit Logs
Immutable record of who did what, when.
Multi-Region Deployment
Regional endpoints and cross-region replication.
Plugin & Extension Architecture
Extend the platform with custom plugins.
Internationalization
Multi-language and multi-currency support.
Filtering & Querying
Server-side filters, sorting, and field selection.
No-Code / Low-Code Builder
Visual configuration without writing code.
Event Streaming
Durable event logs and stream consumption.
Batch & Bulk Operations
Submit or retrieve many records in one call.
File Upload & Object Storage
Binary upload, storage, and retrieval.
API Gateway
Managed ingress with routing, auth, and policy.
High Availability
Redundant, fault-tolerant architecture.
Auto Scaling
Capacity that grows and shrinks with load.
Prebuilt Connectors
A library of ready integrations to other systems.
WebSockets
Persistent bidirectional connections for live data.
API Versioning
Explicit versions with a stated compatibility policy.
Pagination
Cursor or offset paging through large result sets.
API Discovery & Catalog
A machine-readable index of available APIs.
SOC 2
Independently audited SOC 2 controls.
Caching & Conditional Requests
ETags, cache headers, and conditional GETs.
Edge Computing & CDN
Execution and caching at points of presence.
GraphQL API
Single-endpoint query language with client-shaped responses.
Agent Skills
Packaged skills and instructions for AI agents.
Developer Portal
A self-service hub for keys, docs, and apps.
Encryption at Rest & in Transit
TLS on the wire, encrypted storage, and key control.
Full-Text Search
Indexed text search across the provider's corpus.
Scheduled Jobs & Cron
Recurring, time-triggered execution.
SCIM User Provisioning
Automated user and group provisioning via SCIM.
Data Export
Full export of your data out of the platform.
Multiple Output Formats
JSON, XML, CSV, and other selectable representations.
API Governance
Linting, standards, and design rules enforced automatically.
Infrastructure as Code
Terraform, Pulumi, or declarative configuration.
Multi-Protocol Support
Several interfaces — REST, GraphQL, gRPC, streaming — on one product.
Private Networking
VPC peering, PrivateLink, and private endpoints.
White-Label & Branding
Rebrand the product as your own.
CI/CD Integration
Hooks into build and deployment pipelines.
Multi-Factor Authentication
Second-factor and step-up authentication support.
Request Signing
HMAC or cryptographically signed requests.
API Documentation
Reference docs, guides, and examples.
Historical Data & Time Series
Deep archives and time-series history, not just current state.
Multi-Cloud Support
Runs on AWS, Azure, GCP, and beyond.
OpenAI-Compatible API
Drop-in compatibility with the OpenAI request shape.
Uptime SLA
A contractual availability commitment.
API Testing Tooling
Built-in contract, integration, and load testing.
Data Governance & Lineage
Cataloging, lineage, and quality controls over data.
Fully Managed Service
Vendor operates the infrastructure for you.
Idempotency
Safe retries without duplicate side effects.
Secrets & Credential Management
Safe storage and rotation of keys and secrets.
Embeddings & Vector Support
Vector embeddings and similarity search.
Real-Time Data
Live, low-latency data rather than delayed snapshots.
Function Calling & Tool Use
Structured tool definitions LLMs can invoke.
HIPAA Compliance
Protected health information handled under HIPAA.
Fine-Grained Authorization
Attribute, resource, or field-level permission control.
Code & SDK Generation
Generate clients, types, or servers from the spec.
DDoS & Abuse Protection
Traffic filtering, WAF, and bot mitigation.
Embeddable UI Components
Drop-in widgets and hosted UI.
gRPC
High-performance binary RPC over HTTP/2.
Status Page & Incident Communication
Public health status, incidents, and history.
GDPR & Privacy Compliance
EU/UK privacy obligations and data-subject rights.
Human-in-the-Loop Controls
Approval gates on automated actions.
ISO 27001
Certified information-security management system.
LLM Inference
Hosted model inference endpoints.
Public / No Authentication
Open endpoints callable without credentials.
Usage Analytics
Per-key and per-endpoint consumption reporting.
Backup & Point-in-Time Recovery
Automated backups and restore to a prior state.
Basic Authentication
HTTP Basic username and password credentials.
Postman Collection
A ready-to-run collection for API exploration.
JSON Responses
JSON as the primary request and response format.
Fine-Tuning & Custom Models
Adapt hosted models to your own data.
MQTT & IoT Protocols
Lightweight pub/sub messaging for devices.
Push Notifications
Mobile and browser push message delivery.
PCI DSS
Cardholder-data handling certified to PCI DSS.
CORS Support
Browser-callable endpoints with CORS headers.
Feature Flags
Toggle behavior without redeploying.
FedRAMP & Government Authorization
Authorized for US public-sector workloads.
Structured Error Handling
Machine-readable, documented error responses.
Command-Line Interface
An official CLI for scripting and automation.
Mutual TLS
Certificate-based client authentication at the transport layer.
SOAP & XML Web Services
WSDL-described SOAP endpoints.
Vulnerability Disclosure & Bug Bounty
A published path for reporting security issues.
Deprecation Policy
Advance notice and sunset windows for changes.
RSS & Atom Feeds
Syndication feeds for content and updates.