Free
Authentication · API Tools
Official resource for the OAuth 2.0 authorization framework.
oauthauthspecificationreference
Browse the complete directory — use filters to narrow down.
Authentication · API Tools
Official resource for the OAuth 2.0 authorization framework.
Payments · API Tools
Merchant-of-record payments for SaaS — global tax, invoicing and subscriptions handled for you.
Payments · API Tools
Open-source payments and monetization for developers — checkouts, subscriptions and license keys, MoR model.
API Documentation · API Tools
OpenAPI linting, bundling and three-panel reference docs.
Tunneling & Debugging · API Tools
Open-source HTTP interception: modify requests, mock, and debug in browser.
Email · API Tools
Developer-first email API with React Email templates.
Payments · API Tools
Subscription infrastructure for mobile apps — cross-platform in-app purchases, entitlements and analytics.
API Documentation · API Tools
Beautiful OpenAPI docs and modern API client, open source.
API Testing · API Tools
API testing tool specialized in SOAP and REST services.
API Documentation · API Tools
Design-first API platform for specs, docs, mocking and governance.
Payments · API Tools
The standard payments platform with excellent developer APIs.
API Documentation · API Tools
OpenAPI tooling suite by SmartBear: UI, editor, codegen and more.
Tunneling & Debugging · API Tools
WireGuard-based mesh VPN that just works — private access to your dev machines, databases and homelab.
API Mocking · API Tools
Instantly inspect and test incoming webhooks with a temporary URL.
API Mocking · API Tools
Flexible API mocking and service virtualization for HTTP.
Payments · API Tools
Payment gateway for Indonesia and Southeast Asia markets.
API Tools
Xquik is the world's fastest and cheapest X Twitter scraper service with the most complete X data. Access X data through REST, MCP & SDKs. Analyze post sentiment with AI. Most other Apify Actors charge before filtering or deduplication. Xquik charges only for delivered, unique, filter-matching results and never pads rows. Xquik has paid plans & usage-based billing. Xquik is an independent third-party service. Not affiliated with X Corp. "Twitter" and "X" are trademarks of X Corp.
API Clients · API Tools
Offline-first, open-source API client for REST, GraphQL and gRPC.
Authentication · API Tools
TypeScript-first schema validation with static type inference.