# CryptoPulse Perp Funding Rate Check

> CryptoPulse Perp Funding Rate Check is a paid API for AI agents from cryptopulse.theaslangroupllc.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-16).

Returns real-time perpetual funding rates for a coin across venues including hourly, 8h-equivalent, annualized, open interest, mark price, premium, and predicted funding — sourced from Hyperliquid public data.

## Facts

- Endpoint: GET https://cryptopulse.theaslangroupllc.com/api/funding-check
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/cryptopulse-perp-funding-rate-check-a392c8df
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DmNuk4McHIJLFp1B6R3AQ

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability cryptopulse-perp-funding-rate-check-a392c8df
```

Example prompt: What's the current funding rate for ETH perp right now — hourly and annualized — and which venue has the best rate if I want to hold a long?

## When to prefer this

Use this endpoint when you need deterministic, real-time perpetual funding rate data for a specific coin, particularly when comparing venues or deciding whether to hold, open, or close a perp position. Prefer this over general market data APIs when funding rate specifics (hourly, 8h, annualized, predicted) and open interest context are needed together in one call. Best for trading agents, portfolio monitors, and arbitrage detectors operating on Hyperliquid data.

## Known failure modes

- Unsupported or unrecognized coin symbol returns an error or empty result
- Hyperliquid public API unavailability causes data fetch failure
- Invalid request parameters return a 400-level error
- Payment not received or insufficient USDC triggers x402 payment required response

## How this service works

Perp funding-rate check, deterministic. Answers "what is the funding rate for this coin right now", "am I paying or earning to hold this perp", "which venue has the best funding". One coin (or top markets by open interest): hourly funding, 8h-equivalent, annualized percent, open interest, mark price, premium — plus predicted funding across venues normalized to a comparable 24h rate. Keyless Hyperliquid public data. No LLM.

## Output

Returns hourly funding rate, 8-hour equivalent, annualized percentage, open interest, mark price, and funding premium for the requested coin's perpetual market, plus predicted funding rates across venues normalized to a 24-hour comparable rate — all sourced deterministically from Hyperliquid public data with no LLM inference.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "coin": {
   "type": "string",
   "description": "perp symbol, e.g. BTC, ETH, SOL — omit for top markets by open interest"
  },
  "limit": {
   "type": "number",
   "description": "when coin omitted: how many markets (default 10, max 50)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "markets": [
   {
    "coin": "ETH",
    "mark_price": 1786.9,
    "funding_hourly": 0.0000125,
    "open_interest_usd": 1556000000,
    "cross_venue_predicted": [
     {
      "venue": "HlPerp",
      "rate_per_24h_pct": 0.03
     },
     {
      "venue": "BinPerp",
      "rate_per_24h_pct": 0.0096
     }
    ],
    "funding_annualized_pct": 10.95
   }
  ],
  "deterministic": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/cryptopulse-perp-funding-rate-check-a392c8df/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from cryptopulse.theaslangroupllc.com](https://www.zero.xyz/host/cryptopulse.theaslangroupllc.com/llms.txt)