Triggers Z Differential

{
  "_cache": {
    "hit": false
  },
  "backtest_evidence": {
    "hit_rate": 0.513,
    "max_drawdown": -0.988,
    "profit_factor": 1.33,
    "sample_size": 493,
    "sharpe_ratio": 0.11,
    "sortino_ratio": 0.17
  },
  "ok": true,
  "trigger": {
    "asof_day": "2026-07-10",
    "asset": "BTC",
    "confidence": 0,
    "expression": {
      "metric_a_id": "VOL_RV_7D",
      "metric_b_id": "VOL_RV_30D",
      "operator": "abs_gt",
      "threshold": 1,
      "type": "z_differential"
    },
    "fires_now": false,
    "horizon": "14d"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://cryptyx.ai/api/triggers/z-differential?asset=&horizon=&metric_a_id=&metric_b_id=&operator=&threshold=0'

# 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://cryptyx.ai/api/triggers/z-differential?asset=&horizon=&metric_a_id=&metric_b_id=&operator=&threshold=0' \
  | 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 $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
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 $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fcryptyx.ai%2Fapi%2Ftriggers%2Fz-differential
const res = await pay("https://cryptyx.ai/api/triggers/z-differential?asset=&horizon=&metric_a_id=&metric_b_id=&operator=&threshold=0");
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 $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://cryptyx.ai/api/triggers/z-differential?asset=&horizon=&metric_a_id=&metric_b_id=&operator=&threshold=0")
    print(res.status_code, res.text)