Open Interest
GET/v1/cryptodata/market-intelligence/open-interest
Cross-exchange open interest. Returns multi-symbol data (top ~25 perps) when available, falling back to BTC-only from the fast-refresh cache. **Filter semantics:** ``exchange=`` is a **coin-set filter**, not an exchange-data filter. With ``exchange=hyperliquid`` you get the coins listed on Hyperliquid, but each entry's ``exchange_list`` still aggregates open interest across all CEXes. For Hyperliquid's own per-asset OI use ``/daily/hyperliquid`` — note that ``open_interest`` there is in base-coin units, with ``open_interest_usd`` as a derived USD notional.
Price
$0.01/ callEdge cache
Off
Uptime 24h
100.00%
p95
953ms
Parameters
| Name | In | Type | Description |
|---|---|---|---|
| symbol | query | string | Filter to a single coin (e.g. BTC) |
| exchange | query | string = hyperliquid | Filter to coins on exchange: hyperliquid, binance_spot, asterdex, or all |
| type | query | string = perps | Instrument type — currently a no-op reserved for future filtering; only perps data is returned |
| limit | query | integer = 250 | Max coins to return (default 250) |
Code
# 1. No key, no payment: the gateway answers 402 with the price
curl -i "https://api.realtimeapi.ai/v1/cryptodata/market-intelligence/open-interest"
# 2. Pay: retry with a signed x402 payment (any x402 client builds this header)
curl "https://api.realtimeapi.ai/v1/cryptodata/market-intelligence/open-interest" -H "PAYMENT-SIGNATURE: $X402_PAYMENT"// npm i @x402/fetch @x402/core @x402/evm viem
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";
const client = x402Client.fromConfig({ schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(privateKeyToAccount(PRIVATE_KEY)) }] });
const pay = wrapFetchWithPayment(fetch, client);
const data = await (await pay("https://api.realtimeapi.ai/v1/cryptodata/market-intelligence/open-interest")).json();
console.log(data);# pip install x402 eth-account requests
from eth_account import Account
from x402.clients.requests import x402_requests
session = x402_requests(Account.from_key(PRIVATE_KEY))
print(session.get("https://api.realtimeapi.ai/v1/cryptodata/market-intelligence/open-interest").json())curl "https://api.realtimeapi.ai/v1/cryptodata/market-intelligence/open-interest" -H "X-API-Key: $RTAPI_KEY"Frequently asked questions
How do I get open interest from CryptoDataAPI?
Send GET https://api.realtimeapi.ai/v1/cryptodata/market-intelligence/open-interest. Pay $0.01 per request with x402, or send an X-API-Key header.
What does GET /market-intelligence/open-interest cost?
$0.01 per successful request in USDC on Base. Failed requests are never charged.
Can I call this endpoint from an MCP client?
Yes. Connect any MCP client to the RealtimeAPI server and use call_feed with this endpoint's URL, or get_quote to check the price first.