I Built an AI API with Instant USDC Payments (x402 Protocol)

I Built an AI API with Instant USDC Payments

I've been experimenting with the x402 protocol (HTTP 402 + EIP-3009) and built a pay-per-call AI API.

How it works

Unlike traditional AI APIs that require:

• Account registration
• Credit card on file
• Monthly minimums

This API uses crypto-native payments:

1. Make a request → Get 402 with payment info
2. Sign USDC transfer (no ETH needed, thanks to Facilitator)
3. Retry → Get instant response
4. Funds settle on Base L2 in ~2 seconds

Tech Stack

• Backend: FastAPI
• AI Model: DeepSeek-V3
• Payment: x402 Protocol (Coinbase)
• Settlement: Base L2 (USDC)

Pricing

• $0.01 per API call
• No subscriptions
• No minimums

Try it free
Free demo (no payment needed): https://is.gd/UdfAua

Why this matters

The x402 protocol could enable a new wave of micropayment-native APIs where you truly pay per use without friction.

Thoughts? Has anyone else experimented with x402 or similar crypto-native payment patterns?

webdev #ai #web3 #tutorial #python