Calculator

{
  "annualized_yield_pct": null,
  "break_even_analysis": {
    "current_spread_bps": 22,
    "gap_bps": 4,
    "min_spread_bps_to_break_even": 26
  },
  "fee_breakdown": {
    "bridge_fee_usd": 0,
    "flash_fee_usd": 0,
    "gas_usd": 0.5,
    "slippage_usd": 5,
    "taker_fee_buy_usd": 10,
    "taker_fee_sell_usd": 10,
    "total_costs_pct": 0.255,
    "total_costs_usd": 25.5,
    "withdrawal_fee_usd": 0
  },
  "gross_spread_pct": 0.221,
  "gross_spread_usd": 22.12,
  "inputs": {
    "arb_type": "spot",
    "entry_price": 67800,
    "exit_price": 67950,
    "gas_usd": 0.5,
    "slippage_bps": 5,
    "taker_fee_bps": 10,
    "trade_size_usd": 10000
  },
  "net_profit_pct": -0.034,
  "net_profit_usd": -3.38,
  "scale_analysis": [
    {
      "net_pct": 0.032,
      "net_profit_usd": 16.1,
      "size_usd": 50000
    },
    {
      "net_pct": 0.057,
      "net_profit_usd": 57.2,
      "size_usd": 100000
    },
    {
      "net_pct": 0.072,
      "net_profit_usd": 357.5,
      "size_usd": 500000
    }
  ],
  "suggestion": "This spot arb is marginal at $10k. Minimum $50k+ for positive P&L. Consider perps funding carry for better risk-adjusted returns.",
  "verdict": "NOT VIABLE — costs exceed spread"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://arbipulse.theaslangroupllc.com/api/calculator?trade_size_usd=10000'

# 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/calculator?trade_size_usd=10000' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Farbipulse.theaslangroupllc.com%2Fapi%2Fcalculator
const res = await pay("https://arbipulse.theaslangroupllc.com/api/calculator?trade_size_usd=10000");
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
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/calculator?trade_size_usd=10000")
    print(res.status_code, res.text)