Funding Rate API — Perp DEX Funding & Arbitrage Scanner

Get live funding rates and ready-to-trade funding-arbitrage opportunities across 8 decentralized perp DEXs in a single call. No monthly subscription — you pay only for the rows you pull.

Comparable data feeds charge $29–699/month. Here, a typical query costs a few cents.

What can you do with it?

• Find funding-arb trades: see which coin to short on which venue and long on another, ranked by net APR after round-trip taker fees — not the raw spread that evaporates once you pay fees.
• Feed your trading bot: pull normalized funding rates across venues on your own schedule instead of integrating 8 different exchange APIs with 8 different formats and funding intervals.
• Monitor a single venue: filter to just the exchanges or coins you trade.

Supported exchanges (8)

Hyperliquid · Aster · Paradex · Lighter · Binance (via Lighter) · dYdX v4 · Extended · Pacifica

All rates are normalized to a common annualized APR, so a 1h-funding venue and an 8h-funding venue are directly comparable.

How to use

Run the Actor with JSON input (via the Apify Console, API, or any Apify client):

{
  "mode": "arb",
  "symbols": [],
  "venues": [],
  "minNetApr": "0.10",
  "requireOi": true
}

Field	What it does
mode	arb = ranked arbitrage opportunities · rates = raw funding rates per venue per coin
symbols	Only these coins, e.g. ["BTC", "ETH"]. Empty = all (~600 coins)
venues	Only these exchanges, e.g. ["hyperliquid", "paradex"]. Empty = all 8
minNetApr	Arb mode: minimum net APR as a decimal ("0.10" = 10%)
requireOi	Arb mode: drop opportunities where a leg's open interest is unknown — filters thin markets that show absurd, unfillable APRs. Keep true

Results land in the run's dataset — download as JSON, CSV, or Excel, or read them via the Apify API.

Example output — arb mode

{
  "symbol": "LIT",
  "short_venue": "hyperliquid",
  "short_apr": 0.1095,
  "long_venue": "extended",
  "long_apr": -0.3767,
  "spread_apr": 0.4862,
  "net_apr": 0.4132,
  "min_oi_usd": 4528851
}

Read it as: short LIT on Hyperliquid (funding pays you 10.95% APR), long LIT on Extended (negative funding pays you another 37.67%), and after taker fees on both legs you keep an estimated 41.3% APR, with at least $4.5M open interest on the thinner leg.

Example output — rates mode

{
  "venue": "hyperliquid",
  "symbol": "BTC",
  "rate": 0.0000125,
  "interval_hours": 1.0,
  "apr": 0.1095,
  "mark_price": 62903.0,
  "open_interest_usd": 2236125876,
  "fetched_at": 1783326670
}

Call it from code

from apify_client import ApifyClient

client = ApifyClient("<YOUR_API_TOKEN>")
run = client.actor("opaline_midge/funding-radar").call(
    run_input={"mode": "arb", "minNetApr": "0.10", "requireOi": True}
)
for row in client.dataset(run["defaultDatasetId"]).iterate_items():
    print(row["symbol"], row["net_apr"])

Why net APR instead of raw spread?

A 30% funding spread means nothing if you pay 4 taker fees to enter and exit both legs. This Actor subtracts annualized round-trip taker fees (per-venue fee table, verified against official docs) over an assumed 7-day hold, so the ranking reflects what you could actually keep.

FAQ

How fresh is the data? Fetched live from the venues' public APIs at the moment you run the Actor — not cached.

Why do some rows have min_oi_usd: null? A few venues don't publish open interest. With requireOi: true (default) those pairs are excluded from arb results.

Is this trading advice? No. Funding rates flip fast, thin books slip, and DEXs carry smart-contract and counterparty risk. Net APR is an estimate, not a guarantee. Always verify before trading.

A venue is missing from my results. Single-venue outages are isolated — the Actor returns data from the healthy venues instead of failing the whole run.

More

• Free web dashboard (updates every 30 min): https://holydement0r.github.io/Funding-Radar/
• Free Telegram alerts: https://t.me/FundingRadarAlerts
• Open source — code, architecture, and development docs: docs/development.md