FastAPI Input Schema not resolved by x402scan

[yogesh-bansal]

import os
from typing import Dict, Any
from fastapi import FastAPI
from pydantic import BaseModel
from x402.fastapi.middleware import require_payment
from x402.types import PaywallConfig, HTTPInputSchema
from cdp.x402 import create_facilitator_config

app = FastAPI(title="x402 Echo")

echo_input_schema = HTTPInputSchema(
    body_type="json",
    body_fields={"idx": {"type": "integer", "description": "Index to echo", "required": True}},
)

app.middleware("http")(
    require_payment(
        path="/echo",
        price="$0.001",
        pay_to_address="0xB5d6801bC3dd17648e66aE22B80757692b1C5a42",
        network="base",
        paywall_config=PaywallConfig(app_name="x402 Echo"),
        description="Paid echo endpoint for unit tests",
        mime_type="application/json",
        discoverable=True,
        input_schema=echo_input_schema
    )
)

class EchoRequest(BaseModel):
    idx: int

@app.post("/echo")
async def echo(req: EchoRequest) -> Dict[str, Any]:
    return {"idx": req.idx}

For the above code hosted at https://x4023.987659876.xyz/echo when I try to preview it on x402scan.com

It doesn't resolve properly, if I remove the input schema, then the resource is listed but then how can I have the required input listed on x402scan?