Proxy Wallet Watch

{
  "data": {
    "address": "0x622efA6Ceb83a5b6EdBC931332f4db68B7f74F27",
    "balances": [
      {
        "asset": "ETH",
        "balance": "0.000997335048115414",
        "contract": null,
        "delta": "0",
        "previous": "0.000997335048115414"
      },
      {
        "asset": "USDC",
        "balance": "2.1175",
        "contract": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
        "delta": "0.009",
        "previous": "2.1085"
      }
    ],
    "chain": "base",
    "changed": true,
    "changes": [
      "USDC +0.009"
    ],
    "checked_at": "2026-10-09T06:57:47.459Z",
    "cursor": "PvCmm57ILQUJX5jd",
    "cursor_help": "Pass this cursor on your next call. It only advances when a change is reported.",
    "explorer": "https://basescan.org/address/0x622efA6Ceb83a5b6EdBC931332f4db68B7f74F27",
    "first_check": false,
    "nonce": 6,
    "outgoing_tx_since": 0,
    "since": "2026-10-09T06:57:47.318Z",
    "summary": "Since 2026-10-09T06:57:47.318Z: USDC +0.009."
  },
  "success": true
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agentsvc.io/api/v1/proxy/wallet-watch' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x622efA6Ceb83a5b6EdBC931332f4db68B7f74F27","chain":"base"}'

# 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 - -X POST 'https://agentsvc.io/api/v1/proxy/wallet-watch' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x622efA6Ceb83a5b6EdBC931332f4db68B7f74F27","chain":"base"}' \
  | 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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagentsvc.io%2Fapi%2Fv1%2Fproxy%2Fwallet-watch&method=POST
const res = await pay("https://agentsvc.io/api/v1/proxy/wallet-watch", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0x622efA6Ceb83a5b6EdBC931332f4db68B7f74F27",
    "chain": "base"
  }),
});
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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agentsvc.io/api/v1/proxy/wallet-watch",
        json={
            "address": "0x622efA6Ceb83a5b6EdBC931332f4db68B7f74F27",
            "chain": "base",
        },
    )
    print(res.status_code, res.text)