Perp premium and predicted funding

Basis view for one perpetual: mark, oracle and mid price, mark-vs-oracle premium in percent and bps, the impact premium the venue uses for funding, the current hourly funding, and the predicted next funding rate per venue (rate, interval, next funding time, 8h-normalized and annualized) as published by Hyperliquid's predictedFundings feed. No key.

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Input

Example output

{
  "source": "hyperliquid",
  "coin": "BTC",
  "markPx": 77267,
  "oraclePx": 77236,
  "midPx": 77266.5,
  "markOraclePremiumPct": 0.0401,
  "markOraclePremiumBps": 4.01,
  "impactPremiumPct": 0.0388,
  "funding": {
    "hourly": 0.0000125,
    "per8h": 0.0001,
    "aprPct": 10.95
  },
  "predictedFunding": [
    {
      "venue": "HlPerp",
      "fundingRate": 0.0000125,
      "fundingIntervalHours": 1,
      "nextFundingTime": "2026-08-22T13:00:00.000Z",
      "per8h": 0.0001,
      "aprPct": 10.95
    }
  ],
  "fetchedAt": "2026-08-22T12:00:00.000Z"
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/perp-basis \
  -H "Content-Type: application/json" \
  -d '{"coin":"BTC"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/perp-basis", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "coin": "BTC"
  }),
});

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