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.
Rate Limiting
Documented request quotas and throttling behavior.
API Key Authentication
Simple key-based authentication for server-to-server calls.
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.
Internationalization
Multi-language and multi-currency support.
Sandbox Environment
A safe test environment with fake data.
Audit Logs
Immutable record of who did what, when.
Plugin & Extension Architecture
Extend the platform with custom plugins.
Multi-Region Deployment
Regional endpoints and cross-region replication.
Filtering & Querying
Server-side filters, sorting, and field selection.
Event Streaming
Durable event logs and stream consumption.
Batch & Bulk Operations
Submit or retrieve many records in one call.
No-Code / Low-Code Builder
Visual configuration without writing code.
File Upload & Object Storage
Binary upload, storage, and retrieval.
High Availability
Redundant, fault-tolerant architecture.
Auto Scaling
Capacity that grows and shrinks with load.
API Gateway
Managed ingress with routing, auth, and policy.
API Versioning
Explicit versions with a stated compatibility policy.
Prebuilt Connectors
A library of ready integrations to other systems.
WebSockets
Persistent bidirectional connections for live data.
Pagination
Cursor or offset paging through large result sets.
API Discovery & Catalog
A machine-readable index of available APIs.
GraphQL API
Single-endpoint query language with client-shaped responses.
SOC 2
Independently audited SOC 2 controls.
Agent Skills
Packaged skills and instructions for AI agents.
Developer Portal
A self-service hub for keys, docs, and apps.
Edge Computing & CDN
Execution and caching at points of presence.
Full-Text Search
Indexed text search across the provider's corpus.
Caching & Conditional Requests
ETags, cache headers, and conditional GETs.
Encryption at Rest & in Transit
TLS on the wire, encrypted storage, and key control.
SCIM User Provisioning
Automated user and group provisioning via SCIM.
Scheduled Jobs & Cron
Recurring, time-triggered execution.
API Governance
Linting, standards, and design rules enforced automatically.
Data Export
Full export of your data out of the platform.
Multi-Protocol Support
Several interfaces — REST, GraphQL, gRPC, streaming — on one product.
Multiple Output Formats
JSON, XML, CSV, and other selectable representations.
Private Networking
VPC peering, PrivateLink, and private endpoints.
CI/CD Integration
Hooks into build and deployment pipelines.
White-Label & Branding
Rebrand the product as your own.
Idempotency
Safe retries without duplicate side effects.
Infrastructure as Code
Terraform, Pulumi, or declarative configuration.
Multi-Factor Authentication
Second-factor and step-up authentication support.
API Documentation
Reference docs, guides, and examples.
Request Signing
HMAC or cryptographically signed requests.
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.
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.
Embeddings & Vector Support
Vector embeddings and similarity search.
Secrets & Credential Management
Safe storage and rotation of keys and secrets.
Fully Managed Service
Vendor operates the infrastructure for you.
Function Calling & Tool Use
Structured tool definitions LLMs can invoke.
Real-Time Data
Live, low-latency data rather than delayed snapshots.
Code & SDK Generation
Generate clients, types, or servers from the spec.
Embeddable UI Components
Drop-in widgets and hosted UI.
Fine-Grained Authorization
Attribute, resource, or field-level permission control.
gRPC
High-performance binary RPC over HTTP/2.
HIPAA Compliance
Protected health information handled under HIPAA.
Status Page & Incident Communication
Public health status, incidents, and history.
Usage Analytics
Per-key and per-endpoint consumption reporting.
DDoS & Abuse Protection
Traffic filtering, WAF, and bot mitigation.
Human-in-the-Loop Controls
Approval gates on automated actions.
LLM Inference
Hosted model inference endpoints.
Public / No Authentication
Open endpoints callable without credentials.
Backup & Point-in-Time Recovery
Automated backups and restore to a prior state.
GDPR & Privacy Compliance
EU/UK privacy obligations and data-subject rights.
ISO 27001
Certified information-security management system.
Basic Authentication
HTTP Basic username and password credentials.
Fine-Tuning & Custom Models
Adapt hosted models to your own data.
MQTT & IoT Protocols
Lightweight pub/sub messaging for devices.
Postman Collection
A ready-to-run collection for API exploration.
Push Notifications
Mobile and browser push message delivery.
JSON Responses
JSON as the primary request and response format.
PCI DSS
Cardholder-data handling certified to PCI DSS.
Feature Flags
Toggle behavior without redeploying.
CORS Support
Browser-callable endpoints with CORS headers.
Vulnerability Disclosure & Bug Bounty
A published path for reporting security issues.
FedRAMP & Government Authorization
Authorized for US public-sector workloads.
Structured Error Handling
Machine-readable, documented error responses.
SOAP & XML Web Services
WSDL-described SOAP endpoints.
Command-Line Interface
An official CLI for scripting and automation.
Deprecation Policy
Advance notice and sunset windows for changes.
Mutual TLS
Certificate-based client authentication at the transport layer.
RSS & Atom Feeds
Syndication feeds for content and updates.