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X402 Chain Reads V1 Base Erc20 Balanceof

by Base ERC-20 Balance in Onchain & crypto

x402 APIPassing, checked 2 h ago

Base ERC-20 token balance of a holder address. ERC-20 balance read on Base: takes token (ERC-20 contract, 0x + 40 hex) and address (holder, 0x + 40 hex) and returns that holder's balanceOf as read from the token contract.

GET
https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_erc20_balanceof
Price
$0.003
per call in USDC
Uptime
100%
last 30 days
Response time
307 ms
351 ms slowest 5%
Last check
Passed
2 h ago, next any minute now

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

GET https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_erc20_balanceof

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.

GET https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_erc20_balanceof?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Parameters

ParameterTypeRequiredDescription
addressstringNoholder, 0x + 40 hex
tokenstringNoERC-20 contract, 0x + 40 hex

Example response

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

{
  "chain": "base",
  "method": "balanceOf",
  "ok": true,
  "result": "70000",
  "service": "x402_chain_reads_v1.base_erc20_balanceof"
}

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 'https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_erc20_balanceof?address=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 - 'https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_erc20_balanceof?address=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%2Fapi.arysphere.com%2Fv1%2Fventures%2Fx402_chain_reads_v1%2Fbase_erc20_balanceof
const res = await pay("https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_erc20_balanceof?address=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.get("https://api.arysphere.com/v1/ventures/x402_chain_reads_v1/base_erc20_balanceof?address=0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913")
    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
2 h agoPassed402307 ms$0.003
7 h agoPassed402351 ms$0.003
12 h agoPassed402284 ms$0.003