Flash

{
  "asset": "USDC",
  "calldata": "0x42b0b77c000000000000000000000000<receiver_address>000000000000000000000000833589fcd6edb6e08f4c7c32d4f71b54bda02913000000000000000000000000000000000000000000000000000000005f5e100000000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  "chain": "base",
  "estimated_gas_usd": 0.5,
  "execution_flow": [
    {
      "action": "Call flashLoanSimple on Aave Pool",
      "details": "Pool transfers 100,000 USDC to your receiver contract",
      "step": 1
    },
    {
      "action": "executeOperation callback fires",
      "details": "Your contract executes the arb — swap USDC→ETH on DEX A, ETH→USDC on DEX B",
      "step": 2
    },
    {
      "action": "Approve and repay",
      "details": "Approve Pool for 100,090 USDC (principal + 0.09% fee) — all in same tx",
      "step": 3
    },
    {
      "action": "Profit withdrawn",
      "details": "Remaining USDC balance is your profit — tx reverts if insufficient",
      "step": 4
    }
  ],
  "executor_contract_template": "interface IFlashLoanSimpleReceiver {\n  function executeOperation(address asset, uint256 amount, uint256 premium, address initiator, bytes calldata params) external returns (bool);\n}\n\ncontract FlashArb is IFlashLoanSimpleReceiver {\n  address constant AAVE_POOL = 0xA238Dd80C259a72e81d7e4664a9801593F98d1c5;\n  // ... implement executeOperation with your arb logic\n}",
  "flash_fee_pct": 0.09,
  "flash_fee_usd": 90,
  "gas_estimate_gwei": 250000,
  "loan_amount_usd": 100000,
  "net_profit_estimate_usd": 847.5,
  "onchain_resources": [
    {
      "name": "Aave V3 Flash Loan Docs",
      "url": "https://docs.aave.com/developers/guides/flash-loans"
    },
    {
      "name": "Aave Base Pool",
      "url": "https://basescan.org/address/0xA238Dd80C259a72e81d7e4664a9801593F98d1c5"
    }
  ],
  "pool_address": "0xA238Dd80C259a72e81d7e4664a9801593F98d1c5",
  "protocol": "aave-v3",
  "pulse_suggestions": [],
  "required_approvals": [
    {
      "amount": "amount + fee after execution",
      "spender": "0xA238Dd80C259a72e81d7e4664a9801593F98d1c5",
      "token": "USDC"
    }
  ],
  "risk_factors": [
    "Tx reverts if arb profit < loan fee",
    "Gas cost reduces net profit",
    "Front-running by MEV bots"
  ],
  "strategy_summary": "Aave V3 Base flash loan: borrow $100,000 USDC, execute DEX arbitrage, repay with 0.09% fee ($90), keep profit.",
  "strategy_type": "dex-arb"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://arbipulse.theaslangroupllc.com/api/flash?amount=100000&asset=USDC&chain=base&protocol=aave&receiver=your+executor+contract+address&strategy=dex-arb'

# 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://arbipulse.theaslangroupllc.com/api/flash?amount=100000&asset=USDC&chain=base&protocol=aave&receiver=your+executor+contract+address&strategy=dex-arb' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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 $0.75 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.75" });
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 $0.75 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Farbipulse.theaslangroupllc.com%2Fapi%2Fflash
const res = await pay("https://arbipulse.theaslangroupllc.com/api/flash?amount=100000&asset=USDC&chain=base&protocol=aave&receiver=your+executor+contract+address&strategy=dex-arb");
console.log(res.status, await res.text());

# 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 $0.75 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.75"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://arbipulse.theaslangroupllc.com/api/flash?amount=100000&asset=USDC&chain=base&protocol=aave&receiver=your+executor+contract+address&strategy=dex-arb")
    print(res.status_code, res.text)