Chain Allowance

Last 30 days

Uptime

100%

Response time

154 ms typical, 154 ms slowest 5%

Last check

3 h ago

Next check

any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X GET "https://api.onesource.io/api/chain/allowance?contract=0xdac17f958d2ee523a2206206994597c13d831ec7&network=ethereum&owner=0xd8da6bf26964af9d7eed9e03e53415d37aa96045&spender=0x6b175474e89094c44da98b954eedeac495271d0f"

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 $0.03:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.onesource.io%2Fapi%2Fchain%2Fallowance
const res = await pay("https://api.onesource.io/api/chain/allowance?contract=0xdac17f958d2ee523a2206206994597c13d831ec7&network=ethereum&owner=0xd8da6bf26964af9d7eed9e03e53415d37aa96045&spender=0x6b175474e89094c44da98b954eedeac495271d0f");
console.log(await res.json());

Example input

{
  "contract": "0xdac17f958d2ee523a2206206994597c13d831ec7",
  "network": "ethereum",
  "owner": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
  "spender": "0x6b175474e89094c44da98b954eedeac495271d0f"
}

Example output

{
  "data": {
    "allowance": "115792089237316195423570985008687907853269984665640564039457584007913129639935",
    "decimals": 6,
    "name": "Tether USD",
    "owner": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
    "spender": "0x6b175474e89094c44da98b954eedeac495271d0f",
    "symbol": "USDT",
    "token": "0xdac17f958d2ee523a2206206994597c13d831ec7"
  },
  "meta": {
    "cost_usdc": "0.001",
    "endpoint": "/api/chain/allowance",
    "payment_chain": "base",
    "payment_token": "USDC",
    "request_id": "00000000abcdef01"
  }
}

Security scan

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

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