Listing Watch

{
  "changed": false,
  "directory": "payai",
  "fetched_at": "2026-01-01T00:00:00Z",
  "fields": {
    "payee": "0x0000000000000000000000000000000000000000",
    "resources": [
      {
        "accepts": [
          {
            "amount": "9000",
            "asset": "0xUSDC",
            "network": "eip155:8453"
          }
        ],
        "description": "...",
        "lastUpdated": "2026-01-01T00:00:00Z",
        "resource": "<captured-listing-resource-url>",
        "serviceName": "x402 Integrity Check",
        "tags": [
          "x402"
        ],
        "type": "http"
      }
    ]
  },
  "id": "0x2F2E1f54109B2525137EedA4A892600Ee956D42a",
  "snapshot_token": "<43-char-urlsafe-base64>"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://conclavex402p04.pythonanywhere.com/v1/listing-watch/:directory/:id'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://conclavex402p04.pythonanywhere.com/v1/listing-watch/:directory/:id' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fconclavex402p04.pythonanywhere.com%2Fv1%2Flisting-watch%2F%3Adirectory%2F%3Aid
const res = await pay("https://conclavex402p04.pythonanywhere.com/v1/listing-watch/:directory/:id");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://conclavex402p04.pythonanywhere.com/v1/listing-watch/:directory/:id")
    print(res.status_code, res.text)