Crypto

{
  "arb_opportunities": [
    {
      "blocking_factors": [
        "Fees exceed spread",
        "BTC withdrawal takes 30-60 min"
      ],
      "buy_exchange": "Coinbase",
      "buy_price": 67838,
      "estimated_fees": {
        "taker_fee_pct": 0.2,
        "total_cost_pct": 0.214,
        "withdrawal_fee_usd": 2.5
      },
      "execution_time_minutes": 45,
      "gross_spread_pct": 0.0059,
      "net_profit_pct": -0.208,
      "net_profit_per_10k_usd": -20.8,
      "sell_exchange": "Kraken",
      "sell_price": 67842,
      "viability_note": "Spread of 0.006% is destroyed by 0.2% taker fees alone. CEX spot arb is only viable on high-spread moments (>0.5%) with pre-funded accounts on both sides.",
      "viable": false
    }
  ],
  "better_alternatives": [
    "Perps funding rate carry (/api/perps)",
    "DEX price arb (/api/dex)",
    "DeFi yield spread (/api/defi)"
  ],
  "exchange_prices": [
    {
      "ask": 67841.2,
      "bid": 67840.1,
      "exchange": "Binance",
      "last": 67840.55,
      "volume_24h_usd": 2100000000
    },
    {
      "ask": 67838,
      "bid": 67836.8,
      "exchange": "Coinbase",
      "last": 67837.4,
      "volume_24h_usd": 380000000
    },
    {
      "ask": 67843.5,
      "bid": 67842,
      "exchange": "Kraken",
      "last": 67842.3,
      "volume_24h_usd": 95000000
    }
  ],
  "market_context": "Tight BTC spreads across CEXs at ~0.01%. Market-makers efficiently equalize prices. CEX spot arb is rarely viable without pre-positioned capital on both sides.",
  "pair": "BTC/USDT",
  "pulse_suggestions": [],
  "scan_time": "2026-06-06T12:00:00Z",
  "why_cex_arb_is_hard": "Withdrawal delays (30 min to 24h) mean the spread evaporates before transfer completes. Pre-funded accounts on both sides eliminate withdrawal risk but require 2x capital."
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://arbipulse.theaslangroupllc.com/api/crypto?amount_usd=10000&pair=BTC%2FUSDT'

# 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/crypto?amount_usd=10000&pair=BTC%2FUSDT' \
  | 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 $0.07 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.07" });
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 $0.07 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Farbipulse.theaslangroupllc.com%2Fapi%2Fcrypto
const res = await pay("https://arbipulse.theaslangroupllc.com/api/crypto?amount_usd=10000&pair=BTC%2FUSDT");
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 $0.07 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.07"})
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/crypto?amount_usd=10000&pair=BTC%2FUSDT")
    print(res.status_code, res.text)