Route, verify, and settle paid API calls with clear traces
Most AI apps waste 70% of their budget. Wrong models. No caching. Payment fees that destroy micropayments. P402.shop: Compare 50+ AI APIs (GPT-5.2, Claude Opus 4.5, Gemini 3, more). Find the right model for your use case. See costs explode from 100 to 1M users. Free. P402.io: Accept micropayments without Stripe's $0.30 killing you. 1% flat fee. Built on x402—HTTP's payment standard, finally working. Vibe-coded apps break at scale. Optimized ones don't.
Hey Product Hunt! 👋
I'm Zeshan. I built P402 because I kept seeing the same pattern:
**AI apps work at 50 users. They break at 500.**
Not because AI is too expensive. Because of two things nobody talks about:
**1. Wrong model selection**
Most developers pick GPT-5.2 or Claude Opus and use it for everything. But for 80% of tasks—summarization, classification, simple queries—Haiku 4.5 at $5/M works just as well as models costing $14-25/M.
That's 70% waste hiding in plain sight.
**2. Payment fees on micropayments**
If you charge $0.05 per API call, Stripe takes $0.30. You lose money on every transaction. This is why nobody offers true pay-per-use pricing.
**So I built two tools:**
**P402.shop** = See exactly where you're overpaying
- Compare 50+ AI APIs (all the 2026 models: GPT-5.2, Opus 4.5, Gemini 3, etc.)
- Watch your costs explode from 100 to 1M users
- Spot the hidden waste
**P402.io** = Payment infrastructure that actually works for micropayments
- 1% flat fee (vs Stripe's $0.30 minimum)
- Built on x402—HTTP 402 "Payment Required" has been reserved since 1997, we finally made it work
- Users pay once, use for an hour (no popup per request)
The "aha moment" is when someone enters their use case into P402.shop and watches their costs explode at scale. That's when optimization stops being theoretical.
**What I'd love feedback on:**
- Is the value clear?
- What models/providers should we add?
- What would stop you from trying this?
P402.shop is free forever. P402.io has a generous free tier.
Let's fix the AI cost crisis. 🚀
Zeshan
