Crypto Funding Rates

{
  "average_annualized_pct": 5.12,
  "average_funding_8h_pct": 0.00468,
  "base": "BTC",
  "bias": "funding near neutral",
  "funding_spread_8h_pct": 0.00992,
  "highest": {
    "exchange": "hyperliquid",
    "funding_rate_8h_pct": 0.01
  },
  "lowest": {
    "exchange": "dydx",
    "funding_rate_8h_pct": 0.00008
  },
  "venues": [
    {
      "annualized_pct": 10.95,
      "exchange": "hyperliquid",
      "funding_interval_hours": 1,
      "funding_rate_8h_pct": 0.01,
      "mark_price": 82723.5
    },
    {
      "annualized_pct": 7.83,
      "exchange": "deribit",
      "funding_interval_hours": 8,
      "funding_rate_8h_pct": 0.00715,
      "mark_price": 82672.87
    },
    {
      "annualized_pct": 4.77,
      "exchange": "okx",
      "funding_interval_hours": 8,
      "funding_rate_8h_pct": 0.00435
    },
    {
      "annualized_pct": 4.71,
      "exchange": "bitget",
      "funding_interval_hours": 8,
      "funding_rate_8h_pct": 0.0043
    },
    {
      "annualized_pct": 2.41,
      "exchange": "gateio",
      "funding_interval_hours": 8,
      "funding_rate_8h_pct": 0.0022,
      "mark_price": 82719.4
    },
    {
      "annualized_pct": 0.09,
      "exchange": "dydx",
      "funding_interval_hours": 1,
      "funding_rate_8h_pct": 0.00008,
      "mark_price": 82649.32102
    }
  ],
  "venues_checked": 6,
  "venues_responding": 6
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://saylorinnovations.com/api/crypto/funding-rates?base=BTC'

# 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/crypto/funding-rates?base=BTC' \
  | 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%2Fcrypto%2Ffunding-rates
const res = await pay("https://saylorinnovations.com/api/crypto/funding-rates?base=BTC");
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/crypto/funding-rates?base=BTC")
    print(res.status_code, res.text)