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

> Source: <https://dev.to/lyx19951121/i-built-a-zero-markup-ai-api-gateway-18-models-at-provider-cost-4jf7>
> Published: 2026-06-14 08:31:26+00:00

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.

I built [aipossword.cn](https://aipossword.cn) — an open-source AI API gateway with zero markup 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 |

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

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.

Visit [aipossword.cn](https://aipossword.cn) — free $5 credits, no credit card required.

Source: [github.com/QuantumNous/new-api](https://github.com/QuantumNous/new-api)