Pairs

{
  "asset_a": "BTC",
  "asset_b": "ETH",
  "asset_class": "crypto",
  "asset_class_specific_notes": "Crypto pairs are highly correlated in bull markets but diverge on asset-specific news (ETH upgrades, BTC halving). Trade through perpetual futures for easy short access.",
  "current_signal": {
    "current_relationship": "ETH is trading at a premium to its historical BTC ratio. ETH/BTC ratio elevated vs 30-day average.",
    "estimated_z_score": 1.8,
    "signal_strength": "moderate",
    "spread_direction": "asset_b_premium"
  },
  "pair_statistics": {
    "cointegration_assessment": "strong",
    "estimated_correlation_30d": 0.87,
    "historical_context": "BTC/ETH is one of the most studied crypto pairs. The ETH/BTC ratio (currently 0.052) oscillates between 0.04 and 0.07 across cycles.",
    "mean_reversion_speed": "medium (1-7d)",
    "typical_spread_behavior": "ETH typically prices at 6-8% of BTC value. Deviations >2 standard deviations historically revert within 2-7 days."
  },
  "pulse_suggestions": [],
  "related_pairs_to_watch": [
    "ETH/SOL",
    "BTC/SOL",
    "WBTC/WETH on-chain spread"
  ],
  "risks": [
    "Correlation can break permanently (e.g. ETH merge changed dynamics)",
    "Crypto market structure shifts make historical z-scores unreliable",
    "Both legs can move adversely in a flash crash"
  ],
  "scan_time": "2026-06-06T12:00:00Z",
  "size_guidance": {
    "dollar_neutral": true,
    "hedge_ratio": 1,
    "max_position_size_pct_of_capital": 5,
    "recommended_notional_per_leg": "$5,000-$50,000"
  },
  "trade_signal": {
    "action": "long_a_short_b",
    "entry_condition": "ETH/BTC ratio above 0.054 (current: 0.056)",
    "estimated_profit_bps": 380,
    "exit_condition": "ETH/BTC ratio returns to 0.052 (30d mean)",
    "rationale": "ETH/BTC at 1.8 std devs above 30d mean. If historical correlation holds, ETH likely to underperform BTC short-term.",
    "stop_loss_condition": "ETH/BTC ratio exceeds 0.060 (3 std devs)",
    "typical_holding_period": "3-10 days"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://arbipulse.theaslangroupllc.com/api/pairs?asset_a=BTC&asset_b=ETH&asset_class=crypto&lookback_days=30'

# 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/pairs?asset_a=BTC&asset_b=ETH&asset_class=crypto&lookback_days=30' \
  | 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 $0.15 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.15" });
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 $0.15 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Farbipulse.theaslangroupllc.com%2Fapi%2Fpairs
const res = await pay("https://arbipulse.theaslangroupllc.com/api/pairs?asset_a=BTC&asset_b=ETH&asset_class=crypto&lookback_days=30");
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 $0.15 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.15"})
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/pairs?asset_a=BTC&asset_b=ETH&asset_class=crypto&lookback_days=30")
    print(res.status_code, res.text)