ToolVet
78trust / 100

Base Balance

by agentshelf.syntexa.ch in Onchain & crypto

x402 APIPassing, checked 4 min ago

Call when an agent needs Base mainnet ETH and USDC balances, tx_count, and a rough x402 affordability hint for one address. Send address as EIP-55 or all-lowercase 0x. Read-only eth_getBalance and USDC balanceOf on eip155:8453. No private key and no spend. Send JSON {"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/base-balance first.

POST
https://agentshelf.syntexa.ch/v1/base-balance
Price
$0.003
per call in USDC
Uptime
100%
last 30 days
Response time
32 ms
46 ms slowest 5%
Last check
Passed
4 min ago, next in 26 min

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

POST https://agentshelf.syntexa.ch/v1/base-balance

Each call costs $0.003 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://agentshelf.syntexa.ch/v1/base-balance
content-type: application/json

{
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
}

Parameters

ParameterTypeRequiredDescription
addressstringYesEVM address on Base mainnet (eip155:8453). Example: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045. EIP-55 checksum or all one case. Returns eth_wei, eth, usdc_atomic, usdc, tx_count, and x402_hint. Read-only. No private key.

Example response

The provider's example. We can't check it without paying.

{
  "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "billed": true,
  "eth": "1",
  "eth_wei": "1000000000000000000",
  "network": "eip155:8453",
  "ok": true,
  "receipt_id": "rcpt_01EXAMPLE000000000000000",
  "tx_count": 42,
  "usdc": "2.5",
  "usdc_atomic": "2500000",
  "usdc_contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "warnings": [],
  "x402_hint": "USDC balance covers about 1250 payments of $0.002 or 250 of $0.01 on Base."
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agentshelf.syntexa.ch/v1/base-balance' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}'

# 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://agentshelf.syntexa.ch/v1/base-balance' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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%2Fagentshelf.syntexa.ch%2Fv1%2Fbase-balance&method=POST
const res = await pay("https://agentshelf.syntexa.ch/v1/base-balance", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# 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://agentshelf.syntexa.ch/v1/base-balance",
        json={
            "address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
4 min agoPassed40233 ms$0.003
5 h agoPassed40235 ms$0.003
9 h agoPassed40233 ms$0.003
14 h agoPassed40233 ms$0.003
18 h agoPassed40233 ms$0.003
Show 10 older checks
22 h agoPassed40233 ms$0.003
26 h agoPassed40230 ms$0.003
31 h agoPassed40246 ms$0.003
35 h agoPassed40232 ms$0.003
39 h agoPassed40234 ms$0.003
43 h agoPassed40236 ms$0.003
2 days agoPassed40231 ms$0.003
2 days agoPassed402155 ms$0.003
2 days agoPassed40232 ms$0.003
3 days agoPassed40230 ms$0.003