pip install "4mica-x402[fastapi]" "4mica-x402[httpx]"

PRIVATE_KEY=0xYourPrivateKey
PAY_TO=0xYourSellerAddress

from fastapi import FastAPI
from fourmica_x402.http import fastapi_payment_middleware_from_config

app = FastAPI()

routes = {
    "GET /premium-content": {
        "accepts": {
            "scheme": "4mica-credit",
            "price": "$0.10",
            "network": "eip155:11155111",
            "payTo": "0xYourAddress",
        },
        "description": "Access to premium FastAPI content",
    },
}

middleware = fastapi_payment_middleware_from_config(
    routes,
)

@app.middleware("http")
async def x402_middleware(request, call_next):
    return await middleware(request, call_next)

@app.get("/premium-content")
async def premium_content():
    return {"message": "This is premium content behind a paywall"}

import httpx
from x402 import x402Client
from x402.http.clients import x402_httpx_transport
from fourmica_x402.client_scheme import FourMicaEvmScheme

client = x402Client()
client.register("eip155:11155111", FourMicaEvmScheme("0xYourPrivateKey"))

async with httpx.AsyncClient(
    transport=x402_httpx_transport(client)
) as session:
    response = await session.get("http://localhost:8000/premium-content")
    print(response.status_code, response.json())