Perps Funding

{
  "coins": [
    {
      "apr_pct": {
        "binance": -0.29,
        "bybit": 5.28,
        "hyperliquid": 10.95
      },
      "arb": "short hyperliquid / long binance",
      "coin": "BTC",
      "crowded": null,
      "funding_by_venue": [
        {
          "annualized_rate_pct": 10.95,
          "funding_interval_hours": 1,
          "funding_rate": 0.0000125,
          "venue": "hyperliquid"
        }
      ],
      "max_spread_apr_pct": 11.24,
      "open_interest_usd": 3290777000
    }
  ],
  "count": 1,
  "fetched_at": "2026-09-24T19:00:00.000Z",
  "generated_at": "2026-09-24T19:00:00.000Z",
  "source": {
    "provider": "hyperliquid",
    "venue_feeds": [
      "hyperliquid",
      "binance",
      "bybit"
    ]
  },
  "warnings": []
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/perps/funding'

# 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://saylorinnovations.com/api/perps/funding' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fsaylorinnovations.com%2Fapi%2Fperps%2Ffunding
const res = await pay("https://saylorinnovations.com/api/perps/funding");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://saylorinnovations.com/api/perps/funding")
    print(res.status_code, res.text)