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.
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.
Internationalization
Multi-language and multi-currency support.
Plugin & Extension Architecture
Extend the platform with custom plugins.
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.
Auto Scaling
Capacity that grows and shrinks with load.
High Availability
Redundant, fault-tolerant architecture.
API Versioning
Explicit versions with a stated compatibility policy.
Pagination
Cursor or offset paging through large result sets.
Prebuilt Connectors
A library of ready integrations to other systems.
WebSockets
Persistent bidirectional connections for live data.
API Gateway
Managed ingress with routing, auth, and policy.
SOC 2
Independently audited SOC 2 controls.
API Discovery & Catalog
A machine-readable index of available APIs.
Agent Skills
Packaged skills and instructions for AI agents.
GraphQL API
Single-endpoint query language with client-shaped responses.
Edge Computing & CDN
Execution and caching at points of presence.
Caching & Conditional Requests
ETags, cache headers, and conditional GETs.
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.
API Governance
Linting, standards, and design rules enforced automatically.
Infrastructure as Code
Terraform, Pulumi, or declarative configuration.
Multiple Output Formats
JSON, XML, CSV, and other selectable representations.
Private Networking
VPC peering, PrivateLink, and private endpoints.
Multi-Protocol Support
Several interfaces — REST, GraphQL, gRPC, streaming — on one product.
White-Label & Branding
Rebrand the product as your own.
CI/CD Integration
Hooks into build and deployment pipelines.
Multi-Cloud Support
Runs on AWS, Azure, GCP, and beyond.
Multi-Factor Authentication
Second-factor and step-up authentication support.
Historical Data & Time Series
Deep archives and time-series history, not just current state.
Request Signing
HMAC or cryptographically signed requests.
API Documentation
Reference docs, guides, and examples.
Idempotency
Safe retries without duplicate side effects.
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.
Secrets & Credential Management
Safe storage and rotation of keys and secrets.
Embeddings & Vector Support
Vector embeddings and similarity search.
Function Calling & Tool Use
Structured tool definitions LLMs can invoke.
Real-Time Data
Live, low-latency data rather than delayed snapshots.
Fine-Grained Authorization
Attribute, resource, or field-level permission control.
HIPAA Compliance
Protected health information handled under HIPAA.
Code & SDK Generation
Generate clients, types, or servers from the spec.
gRPC
High-performance binary RPC over HTTP/2.
Status Page & Incident Communication
Public health status, incidents, and history.
DDoS & Abuse Protection
Traffic filtering, WAF, and bot mitigation.
Embeddable UI Components
Drop-in widgets and hosted UI.
GDPR & Privacy Compliance
EU/UK privacy obligations and data-subject rights.
Human-in-the-Loop Controls
Approval gates on automated actions.
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.
ISO 27001
Certified information-security management system.
Fine-Tuning & Custom Models
Adapt hosted models to your own data.
JSON Responses
JSON as the primary request and response format.
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.
Vulnerability Disclosure & Bug Bounty
A published path for reporting security issues.
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.
SOAP & XML Web Services
WSDL-described SOAP endpoints.
RSS & Atom Feeds
Syndication feeds for content and updates.