API2D

API2D is a unified gateway that bundles OpenAI, Claude, Stable Diffusion and other leading AI models behind a single Forward Key. Developers and end-users in China can call large-language-model and generative-AI endpoints without extra proxies or complex auth setup.

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API2DOpenAI API proxyGPT-4 China accessAI model hubChatGPT relayForward KeyLLM API gatewayAI developer tools

Features of API2D

Drop-in replacement for OpenAI chat, completion and edit endpoints—same request/response format

One hub for GPT-4, Claude, Stable Diffusion, Azure TTS and more

Single Forward Key handles authentication, rate limits and billing across every integrated service

Built-in vector-DB interface for knowledge-base and semantic-search apps

Multimodal endpoints: speech-to-text, text-to-speech, image generation

Developer plan adds user management, subscription billing and usage analytics to your app in minutes

Full docs, code samples and compatibility list for 30+ open-source clients

Use Cases of API2D

Build ChatGPT-style bots or AI assistants with GPT-4 without worrying about regional blocks

Let Chinese users access ChatGPT from any web or mobile client that supports custom API hosts

Automate long-form writing, code generation or content creation for business or personal projects

Launch a SaaS AI tool and monetize it instantly with API2D’s user auth and pay-as-you-go billing

Run benchmark tests across GPT, Claude and other models from a single codebase

Create enterprise Q&A or knowledge-base systems using the vector search API for semantic retrieval

FAQ about API2D

QWhat is API2D?

API2D is an AI-model API hub that exposes OpenAI, Claude, Stable Diffusion and more through one unified endpoint and one Forward Key.

QHow do I call GPT-4 with API2D?

Sign up, create a Forward Key, then paste the key and endpoint (https://openai.api2d.net) into any client that supports custom API hosts—done.

QHow does API2D charge?

Pure pay-as-you-go: you pay only for the tokens you consume, priced in “P” units. Pricing is displayed in CNY on the website.

QWhich models are available?

OpenAI GPT-3.5/4, Claude 1 & 2, Stable Diffusion XL, Azure Speech Services and more are live; new models are added weekly.

QWhat is the Forward Key for?

It’s a single token that authenticates and bills every request you send to any model on the platform—no juggling multiple API keys.

QIs there a free tier?

Yes—link your GitHub account at sign-up to receive free credits for testing.

QWhat third-party apps work with API2D?

ChatGPT-Next-Web, OpenCat, Immersive Translate, BotGem, LobeChat and 30+ others that allow custom API endpoints. A full list is on the website.

QHow does API2D protect my data and API keys?

Your traffic travels directly from your client to the API; the Forward Key is the only credential exposed, and you can revoke or rotate it at any time.

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