# Crypto Funding Rate Arbitrage API > The perpetual-futures funding rate for a coin side by side across the major exchanges, and the spread between them — computed live from each venue's public API, no key, nothing stored. A perpetual swap charges or pays funding every few hours to keep its price tethered to spot; when the same coin's funding differs across exchanges, a trader can be long the perp where funding is most negative (and gets paid) and short where it is most positive, harvesting the spread market-neutral. The funding endpoint returns, for a coin, the current funding rate on Binance, Bybit, OKX and Gate.io — per interval and annualised — the venue paying the most, the one charging the most, and the cross-exchange spread (the arbitrage edge). The screener endpoint scans a basket and ranks the coins by the size of that spread, surfacing the biggest funding-arbitrage opportunities. This is the cross-exchange funding-rate / basis-arbitrage cut for crypto — distinct from the single-exchange funding-rates feed (one venue), the spot-versus-perpetual basis and the price APIs in the catalogue. Funding is per interval (most venues settle every 8 hours); annualisation assumes three settlements a day, and intervals can differ by venue, so verify before trading. Coins are bases (BTC, ETH). ## Authentication All requests require your oanor API key in the `x-oanor-key` header. Get one at https://www.oanor.com/developer/keys. ```bash curl -H "x-oanor-key: oanor_live_…" "https://api.oanor.com/fundingarbitrage-api/..." ``` ## Pricing - **Free** (Free) — 350 calls/Mo, 2 req/s - **Starter** ($12/Mo) — 10,600 calls/Mo, 6 req/s - **Pro** ($38/Mo) — 64,000 calls/Mo, 16 req/s - **Business** ($86/Mo) — 330,000 calls/Mo, 40 req/s ## Endpoints ### Funding Arbitrage #### `GET /v1/funding` — Funding rate across exchanges & arbitrage spread **Parameters:** - `coin` (query, required, string) — Coin base symbol Example: `BTC` **Example:** ```bash curl -H "x-oanor-key: $KEY" \ "https://api.oanor.com/fundingarbitrage-api/v1/funding?coin=BTC" ``` **Response:** ```json { "data": { "coin": "BTC", "note": "funding_rate_pct is per funding interval (most venues every 8h); annualized assumes 8-hour funding (3x/day). best_long_venue has the most negative funding (longs are paid); best_short_venue the most positive. The spread is the market-neutral arbitrage edge before fees. Funding intervals can differ by venue — verify before trading.", "source": "Binance + Bybit + OKX + Gate.io", "venues": [ { "exchange": "binance", "annualized_pct": 1.65, "funding_rate_pct": 0.00151 }, { "exchange": "bybit", "annualized_pct": 6.78, "funding_rate_pct": 0.00619 }, { "exchange": "okx", "annualized_pct": -1.12, "funding_rate_pct": -0.00103 }, { "exchange": "gate", "annualized_pct": -4.38, "funding_rate_pct": -0.004 } ], "best_long_venue": "gate", "best_short_venue": "bybit", "exchanges_listed": 4, "spread_annualized_pct": 11.16, "spread_pct_per_interval": 0.01019 }, "meta": { "timestamp": "2026-06-12T10:35:33.261Z", "request_id": "235e6012-2e40-4662-96ca-303b7983c63c" }, "status": "ok", "message": "Funding retrieved successfully", "success": true } ``` #### `GET /v1/screener` — Rank a basket by cross-exchange funding spread **Parameters:** - `coins` (query, optional, string) — Comma list of coins (default liquid majors) Example: `BTC,ETH,SOL,DOGE,XRP` **Example:** ```bash curl -H "x-oanor-key: $KEY" \ "https://api.oanor.com/fundingarbitrage-api/v1/screener?coins=BTC%2CETH%2CSOL%2CDOGE%2CXRP" ``` **Response:** ```json { "data": { "note": "Coins ranked by the cross-exchange funding spread (annualized) — the biggest market-neutral funding-arbitrage edges. Long the perp at best_long_venue, short at best_short_venue. Before fees; verify funding intervals.", "source": "Binance + Bybit + OKX + Gate.io", "scanned": 5, "opportunities": [ { "coin": "ETH", "exchanges": 4, "best_long_venue": "okx", "best_short_venue": "bybit", "spread_annualized_pct": 13.18, "spread_pct_per_interval": 0.01204 }, { "coin": "BTC", "exchanges": 4, "best_long_venue": "gate", "best_short_venue": "bybit", "spread_annualized_pct": 11.16, "spread_pct_per_interval": 0.01019 }, { "coin": "SOL", "exchanges": 4, "best_long_venue": "okx", "best_short_venue": "bybit", "spread_annualized_pct": 8.99, "spread_pct_per_interval": 0.00821 }, { "coin": "DOGE", "exchanges": 4, "best_long_venue": "okx", "best_short_venue": "bybit", "spread_annualized_pct": 5.8, "spread_pct_per_interval": 0.0053 }, { "coi …(truncated, see openapi.json for full schema) ``` ### Meta #### `GET /v1/meta` — Spec **Example:** ```bash curl -H "x-oanor-key: $KEY" \ "https://api.oanor.com/fundingarbitrage-api/v1/meta" ``` **Response:** ```json { "data": { "note": "coin is a base (BTC, ETH). Funding is per interval (most venues every 8h); annualised assumes 3 settlements/day. screener takes coins=BTC,ETH,... (default majors, max 25). Read fresh per call, nothing cached.", "source": "Binance, Bybit, OKX, Gate.io public perpetual endpoints, live", "service": "fundingarbitrage-api", "endpoints": { "GET /v1/meta": "This document.", "GET /v1/funding": "Funding rate across four exchanges with the arbitrage spread (coin=BTC).", "GET /v1/screener": "Rank a basket by cross-exchange funding spread (coins=BTC,ETH,SOL)." }, "exchanges": [ "binance", "bybit", "okx", "gate" ], "description": "Crypto funding-rate arbitrage — the perpetual funding rate for a coin across Binance, Bybit, OKX and Gate.io, and the spread between them, computed live from each venue's public API (no key, nothing stored). funding returns per-venue funding (per interval and annualised), the venue paying the most, the one charging the most and the cross-exchange spread. screener ranks a basket by the size of that spread. The cross-exchange funding / basis-arbitrage cut — distinct from the single-exchange funding-rates feed, the spot-versus-perp basis and the price APIs.", "upstream_status": "ok", "btc_venues_listed": 4 }, "meta": { "timestamp": "2026-06-12T10:35:35.960Z", …(truncated, see openapi.json for full schema) ``` --- Marketplace page: https://www.oanor.com/api/fundingarbitrage-api OpenAPI spec: https://www.oanor.com/api/fundingarbitrage-api/openapi.json