Developers build and train models every day on HuggingFace and put them up for use in Spaces with Gradio or custom apps. HF does a great job of offering a low cost hosting options but there isn't a great way to monetize or charge for testing out custom trained models unless you are taken out side of HF which introduces friction to the experience. For this hackathon I built 2 things to solve for how we can.

1. Give FastAPI a first-class x402 experience for taking micropayments for any endpoint in a permission-less way.
2. Make cheap instant payouts to collaborators for revenue sharing on a pay-per-inference model.
3. Monetize right in HuggingFace Spaces to get early feedback and balance costs and inference resources. People pay for what they like! Validation can come even earlier with x402 and api endpoints.

Training and setup models, inference apis and any other developer apis traditionally need to setup payments and have a website and checkout experience using traditional fiat methods.
When I started working on the hackathon I realized there was no coinbase/x402 python support so I started off by releasing the first version of fastapi-x402 on 6/7/25

One command install: pip install fastapi-x402
One line setup: init_x402(pay_to="0x...", network="base-sepolia")
One decorator usage: @pay("$0.01")

A Penny for your Thoughts is now achievable at scale. Fiat rails would make pay-per-inference untenable even with the lowest cost payment methods out there. But with x402 you can split a USDC penny up very easily and take advantage of x402 facilitators for gas-less transfers.

Middleware pattern → Standard FastAPI approach
Decorator pattern → Matches FastAPI's design philosophy
Automatic configuration → Just like FastAPI's dependency injection
✅ Multi-network support (5 networks)
✅ Real blockchain settlement
✅ Network control patterns
✅ Replay protection
✅ Error handling
📦 Production Readiness (10/10)
✅ Published on PyPI
✅ CI/CD pipeline
✅ Real transaction testing
✅ Clean package structure

After getting the package ready, I wante to demonstrate the instant payout problem solution. For sharing revenue sharing across the developer, HuggingFace for hosting cost, and AWS for model costs on Nova Canvas as the example 3 way revenue payout.
I setup the demo here in Spaces https://huggingface.co/spaces/hamel88/x402-fast-payout-demo
and for any of the 3 generation examples

1. Text Generation with DistillGPT-2 (0.01 USDC) ,
2. Sentiment Analysis with RoBERTa (0.005 USDC)
3. Image Generation with Amazon Nova Canvas. (0.02 USDC)

The Generate button with no wallet connected will display the http 402 return and you should connect a wallet that has Base Sepolia USDC in it to pay for inference. Metamask on desktop & mobile app is supported.

You can open up Spaces Logs and watch the console logs for the Payout details to the 3 wallets.There is a central payout v2 wallet and 3 payout wallets
(10% remains in the payout wallet and the rest distributed /30%/30%/30%) and then also view the split payout on basescan.