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Base Allowance

by AllTheBot ERC-20 allowance in Onchain & crypto

x402 APIPassing, checked 4 h ago

ERC-20 allowance and token approval check on Base: how much a spender contract is approved to move from an owner wallet, with unlimited-approval detection. Run it before a swap, a bridge or a transferFrom.

GET https://api.zkrobotics.fr/x402/base/allowance

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
100%
Response time
61 ms typical, 61 ms slowest 5%
Last check
4 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X GET "https://api.zkrobotics.fr/x402/base/allowance?owner=0x60fd97850059dF9600C4E26f09aC58EF51561963&spender=0x0000000000000000000000000000000000000001&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.zkrobotics.fr%2Fx402%2Fbase%2Fallowance
const res = await pay("https://api.zkrobotics.fr/x402/base/allowance?owner=0x60fd97850059dF9600C4E26f09aC58EF51561963&spender=0x0000000000000000000000000000000000000001&token=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913");
console.log(await res.json());

Example input

{
  "owner": "0x60fd97850059dF9600C4E26f09aC58EF51561963",
  "spender": "0x0000000000000000000000000000000000000001",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}

Example output

{
  "allowance": "0",
  "allowance_raw": "0",
  "network": "base",
  "owner": "0x60fd97850059dF9600C4E26f09aC58EF51561963",
  "spender": "0x0000000000000000000000000000000000000001",
  "token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "unlimited": false
}

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
4 h agoPassed40261 ms$0.003