# APIMaster.ai

> APIMaster.ai is an AI API marketplace and model-authenticity verification service. Buy OpenAI, Claude (Anthropic), and DeepSeek API access at up to 70% off official pricing through fingerprint-verified channels. Every channel is checked with behavioral fingerprinting to detect whether it actually serves the model it claims, helping developers avoid downgraded or substituted models. OpenAI-compatible endpoints with USDT, PayPal, and card payments.

## Tools
- [AI API Marketplace](https://apimaster.ai/): Buy OpenAI, Claude, and DeepSeek API access at up to 70% off; live per-channel pricing and fingerprint-detection history.
- [GPT Pass GPT API Plans](https://apimaster.ai/freemodel): Compare four paid 30-day GPT API subscriptions with rolling 5-hour and 7-day official-price usage limits.
- [Coding Plan](https://apimaster.ai/coding-plan): Use multiple leading Chinese coding models with one API key and a shared 30-day official-price allowance.
- [AI API Model Tester](https://apimaster.ai/ai-api-model-tester): Paste any API endpoint and key; runs a behavioral fingerprint probe and returns the most likely real model plus a TrustScore.
- [AI API Key Tester](https://apimaster.ai/ai-api-key-tester): Check whether an API key works and which models it can access.
- [Provider Trust Rankings](https://apimaster.ai/ai-api-providers): Weekly fingerprint-verification results across LLM API providers and resellers.
- [Detection History](https://apimaster.ai/historyall): Public log of model-authenticity detections.

## Docs
- [Getting Started — API Key](https://apimaster.ai/docs/getting-started/api-key): Create an API key and make your first request.
- [Claude Code setup](https://apimaster.ai/docs/cli/claude-code): Use Claude Code with APIMaster (Anthropic-compatible endpoint).
- [Codex setup](https://apimaster.ai/docs/cli/codex): Use OpenAI Codex with APIMaster (OpenAI-compatible endpoint).
- [Kimi Code CLI setup](https://apimaster.ai/docs/cli/kimi-code): Import APIMaster via Custom Provider Registry (/kimi/registry.json).
- [FAQ](https://apimaster.ai/docs/faq): Pricing, setup, model verification, security, and comparisons.

## Guides
- [Claude API Pricing](https://apimaster.ai/docs/guides/claude-api-pricing): Official Anthropic prices vs APIMaster (about 85% off).
- [Cheapest LLM API](https://apimaster.ai/docs/guides/cheapest-llm-api): Lowest-cost models for high-volume tasks.
- [OpenRouter Alternative](https://apimaster.ai/docs/guides/openrouter-alternative): How APIMaster compares to OpenRouter (adds fingerprint verification + USDT/epay).
- [Claude API Key](https://apimaster.ai/docs/guides/claude-api-key): How to get a Claude API key.
- [OpenAI API Key](https://apimaster.ai/docs/guides/openai-api-key): How to get an OpenAI API key.
- [DeepSeek API](https://apimaster.ai/docs/guides/deepseek-api): Access DeepSeek models via an OpenAI-compatible API.

## About
- Model authenticity via behavioral fingerprinting (300+ stylistic features per model); TrustScore is a probability that a channel serves the claimed model.
- Supported models include Claude (Opus/Sonnet/Haiku), OpenAI GPT-5.x, Gemini, and DeepSeek.
- Pricing includes pay-as-you-go wallet billing from a $1 minimum and optional GPT Pass GPT API plans with rolling 5-hour and 7-day usage limits.