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. Send POST /api/perp-basis with the required field coin and pay $0.002 per call over x402 or MPP (there is no free tier). It returns a JSON object with source, coin, markPx, oraclePx, midPx and 6 more.

No key.

Category: Crypto & onchain data · Tags: crypto derivatives perpetuals basis premium predicted-funding hyperliquid

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Parameters

Example request

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

Without payment this returns HTTP 402 Payment Required with the exact price for perp-basis; any x402 v2 or MPP client pays it and retries.

Example response

{
  "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"
}

From an MCP client

catalog.call {
  "slug": "perp-basis",
  "params": {
    "coin": "BTC"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for perp-basis; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• coin is required. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example, so the caller can correct it.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/perp-basis returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

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();
client.setSpendControls?.(false); // keep your own spending ceiling in code
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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