ToolVet
78trust / 100

Base Erc20 Balance

by agentshelf.syntexa.ch in Onchain & crypto

x402 APIPassing, checked 27 min ago

Call when an agent needs an ERC-20 balance_raw and human balance for token and owner on Base. Example token is Circle USDC. decimals() scales the human balance. Distinct from base-balance (native ETH). Read-only. No spend. Send JSON {"token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","owner":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/base-erc20-balance first.

POST
https://agentshelf.syntexa.ch/v1/base-erc20-balance
Price
$0.003
per call in USDC
Uptime
100%
last 30 days
Response time
32 ms
41 ms slowest 5%
Last check
Passed
27 min ago, next in 3 min

Run a free test callHow to call it

Reliability

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How to call it

POST https://agentshelf.syntexa.ch/v1/base-erc20-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-erc20-balance
content-type: application/json

{
  "owner": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}

Parameters

ParameterTypeRequiredDescription
ownerstringYesWallet whose token balance is read. Example: 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045. EIP-55 or all one case. Returns balance_raw and a human balance from decimals().
tokenstringYesERC-20 contract on Base mainnet. Example: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 (Circle USDC). EIP-55 or all one case. Paired with owner. Distinct from base-balance, which reads native ETH.

Example response

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

{
  "balance": "2.5",
  "balance_raw": "2500000",
  "billed": true,
  "decimals": 6,
  "network": "eip155:8453",
  "ok": true,
  "owner": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
  "receipt_id": "rcpt_01EXAMPLE000000000000000",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "warnings": []
}

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-erc20-balance' \
  -H 'content-type: application/json' \
  --data-raw '{"owner":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}'

# 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-erc20-balance' \
  -H 'content-type: application/json' \
  --data-raw '{"owner":"0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045","token":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}' \
  | 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-erc20-balance&method=POST
const res = await pay("https://agentshelf.syntexa.ch/v1/base-erc20-balance", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "owner": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
    "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
  }),
});
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-erc20-balance",
        json={
            "owner": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
            "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
27 min agoPassed40234 ms$0.003
5 h agoPassed40231 ms$0.003
10 h agoPassed40240 ms$0.003
14 h agoPassed40234 ms$0.003
18 h agoPassed40231 ms$0.003
Show 10 older checks
22 h agoPassed40234 ms$0.003
27 h agoPassed40231 ms$0.003
31 h agoPassed40234 ms$0.003
35 h agoPassed40232 ms$0.003
39 h agoPassed40232 ms$0.003
44 h agoPassed40230 ms$0.003
2 days agoPassed40231 ms$0.003
2 days agoPassed40235 ms$0.003
2 days agoPassed40240 ms$0.003
3 days agoPassed40237 ms$0.003