Perp open interest

Open interest for perpetuals in coins and USD notional. Pass coin for one market (with its share of total open interest) or omit it for the top N markets ranked by USD open interest plus the venue total. Hyperliquid public data, no key.

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Input

Example output

{
  "source": "hyperliquid",
  "totalOpenInterestUsd": 9500000000,
  "markets": [
    {
      "coin": "BTC",
      "openInterest": 35935.67,
      "openInterestUsd": 2776803000,
      "shareOfTotalPct": 29.2,
      "markPx": 77267,
      "volume24hUsd": 4679441788.67
    }
  ],
  "fetchedAt": "2026-08-22T12:00:00.000Z"
}

Try it - see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/perp-open-interest \
  -H "Content-Type: application/json" \
  -d '{"limit":10}'

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-open-interest", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "limit": 10
  }),
});

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