I Built a Zero-Markup AI API Gateway - 18 Models at Provider Cost

#webdev #ai #api #opensource

The Problem

Every AI API gateway I tried added an invisible margin. OpenRouter, the biggest player, quietly marks up every model. You pay more than the provider charges, and you don't even know how much.

The Solution

I built aipossword.cn — an open-source AI API gateway with zero markup pricing.

18 models across DeepSeek, Claude, Qwen
Zero markup — you pay exactly what providers charge
One endpoint — OpenAI compatible, one line code change
Open source — AGPLv3, built on New API (18k+ GitHub stars)
Free $5 credits on signup

Model Pricing

Model	Input/1M	Output/1M
DeepSeek V4 Pro	$0.20	$0.87
DeepSeek V4 Flash	$0.10	$0.20
Claude Opus 4.6	$15.00	$75.00
Claude Opus 4.7	$15.00	$75.00
Qwen 3.7 Max	$1.25	$3.75

Quick Start

curl https://api.aipossword.cn/v1/chat/completions \
  -H "Authorization: Bearer YOUR_KEY" \
  -d '{"model":"deepseek-v4-flash","messages":[{"role":"user","content":"Hello"}]}'

Why I Built This

I got tired of paying hidden fees on every API call. So I forked New API (18k stars), connected 18 models, and set markup to zero.

Is zero markup sustainable? I think the answer is yes — if enterprise users pay for SSO, SLA, and dedicated infrastructure. Individual developers get it free, at cost.